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/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
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* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
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* Copyright (C) 2008 Sun Microsystems
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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/* Copyright (C) 2000-2006 MySQL AB
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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/* Definitions for parameters to do with handler-routines */
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#ifdef USE_PRAGMA_INTERFACE
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#pragma interface /* gcc class implementation */
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#include <my_handler.h>
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#include <ft_global.h>
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#define NO_HASH /* Not yet implemented */
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// the following is for checking tables
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#define HA_ADMIN_ALREADY_DONE 1
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#define HA_ADMIN_NOT_IMPLEMENTED -1
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#define HA_ADMIN_FAILED -2
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#define HA_ADMIN_CORRUPT -3
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#define HA_ADMIN_INTERNAL_ERROR -4
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#define HA_ADMIN_INVALID -5
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#define HA_ADMIN_REJECT -6
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#define HA_ADMIN_TRY_ALTER -7
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#define HA_ADMIN_WRONG_CHECKSUM -8
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#define HA_ADMIN_NOT_BASE_TABLE -9
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#define HA_ADMIN_NEEDS_UPGRADE -10
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#define HA_ADMIN_NEEDS_ALTER -11
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#define HA_ADMIN_NEEDS_CHECK -12
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/* Bits to show what an alter table will do */
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#include <sql_bitmap.h>
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#define HA_MAX_ALTER_FLAGS 39
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typedef Bitmap<HA_MAX_ALTER_FLAGS> HA_ALTER_FLAGS;
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#define HA_ADD_INDEX (0)
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#define HA_DROP_INDEX (1)
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#define HA_ALTER_INDEX (2)
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#define HA_RENAME_INDEX (3)
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#define HA_ADD_UNIQUE_INDEX (4)
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#define HA_DROP_UNIQUE_INDEX (5)
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#define HA_ALTER_UNIQUE_INDEX (6)
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#define HA_RENAME_UNIQUE_INDEX (7)
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#define HA_ADD_PK_INDEX (8)
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#define HA_DROP_PK_INDEX (9)
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#define HA_ALTER_PK_INDEX (10)
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#define HA_ADD_COLUMN (11)
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#define HA_DROP_COLUMN (12)
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#define HA_CHANGE_COLUMN (13)
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#define HA_ALTER_COLUMN_NAME (14)
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#define HA_ALTER_COLUMN_TYPE (15)
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#define HA_ALTER_COLUMN_ORDER (16)
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#define HA_ALTER_COLUMN_NULLABLE (17)
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#define HA_COLUMN_DEFAULT_VALUE (18)
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#define HA_COLUMN_STORAGE (19)
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#define HA_COLUMN_FORMAT (20)
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#define HA_ADD_FOREIGN_KEY (21)
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#define HA_DROP_FOREIGN_KEY (22)
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#define HA_ALTER_FOREIGN_KEY (23)
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#define HA_ADD_CONSTRAINT (24)
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#define HA_CHANGE_CHARACTER_SET (30)
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#define HA_SET_DEFAULT_CHARACTER_SET (31)
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#define HA_CHANGE_AUTOINCREMENT_VALUE (32)
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#define HA_ALTER_STORAGE (33)
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#define HA_ALTER_TABLESPACE (34)
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#define HA_ALTER_ROW_FORMAT (35)
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#define HA_RENAME_TABLE (36)
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#define HA_ALTER_STORAGE_ENGINE (37)
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#define HA_RECREATE (38)
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/* Remember to increase HA_MAX_ALTER_FLAGS when adding more flags! */
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/* Return values for check_if_supported_alter */
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#define HA_ALTER_ERROR -1
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#define HA_ALTER_SUPPORTED_WAIT_LOCK 0
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#define HA_ALTER_SUPPORTED_NO_LOCK 1
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#define HA_ALTER_NOT_SUPPORTED 2
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/* Bits in table_flags() to show what database can do */
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#define HA_NO_TRANSACTIONS (1 << 0) /* Doesn't support transactions */
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#define HA_PARTIAL_COLUMN_READ (1 << 1) /* read may not return all columns */
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#define HA_TABLE_SCAN_ON_INDEX (1 << 2) /* No separate data/index file */
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The following should be set if the following is not true when scanning
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a table with rnd_next()
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- We will see all rows (including deleted ones)
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- Row positions are 'table->s->db_record_offset' apart
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If this flag is not set, filesort will do a postion() call for each matched
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row to be able to find the row later.
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#define HA_REC_NOT_IN_SEQ (1 << 3)
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/* This is now a dead option, just left for compatibility */
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#define HA_CAN_GEOMETRY (1 << 4)
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Reading keys in random order is as fast as reading keys in sort order
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(Used in records.cc to decide if we should use a record cache and by
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filesort to decide if we should sort key + data or key + pointer-to-row
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#define HA_FAST_KEY_READ (1 << 5)
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Set the following flag if we on delete should force all key to be read
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and on update read all keys that changes
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#define HA_REQUIRES_KEY_COLUMNS_FOR_DELETE (1 << 6)
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#define HA_NULL_IN_KEY (1 << 7) /* One can have keys with NULL */
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#define HA_DUPLICATE_POS (1 << 8) /* ha_position() gives dup row */
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#define HA_NO_BLOBS (1 << 9) /* Doesn't support blobs */
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#define HA_CAN_INDEX_BLOBS (1 << 10)
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#define HA_AUTO_PART_KEY (1 << 11) /* auto-increment in multi-part key */
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#define HA_REQUIRE_PRIMARY_KEY (1 << 12) /* .. and can't create a hidden one */
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#define HA_STATS_RECORDS_IS_EXACT (1 << 13) /* stats.records is exact */
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INSERT_DELAYED only works with handlers that uses MySQL internal table
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#define HA_CAN_INSERT_DELAYED (1 << 14)
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If we get the primary key columns for free when we do an index read
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It also implies that we have to retrive the primary key when using
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position() and rnd_pos().
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#define HA_PRIMARY_KEY_IN_READ_INDEX (1 << 15)
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If HA_PRIMARY_KEY_REQUIRED_FOR_POSITION is set, it means that to position()
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uses a primary key. Without primary key, we can't call position().
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#define HA_PRIMARY_KEY_REQUIRED_FOR_POSITION (1 << 16)
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#define HA_CAN_RTREEKEYS (1 << 17) /* Historical, no longer supported */
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#define HA_NOT_DELETE_WITH_CACHE (1 << 18)
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The following is we need to a primary key to delete (and update) a row.
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If there is no primary key, all columns needs to be read on update and delete
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#define HA_PRIMARY_KEY_REQUIRED_FOR_DELETE (1 << 19)
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#define HA_NO_PREFIX_CHAR_KEYS (1 << 20)
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#define HA_CAN_FULLTEXT (1 << 21) /* Historical, no longer supported */
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#define HA_CAN_SQL_HANDLER (1 << 22) /* Historical, no longer supported */
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#define HA_NO_AUTO_INCREMENT (1 << 23)
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#define HA_HAS_CHECKSUM (1 << 24)
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/* Table data are stored in separate files (for lower_case_table_names) */
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#define HA_FILE_BASED (1 << 26)
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#define HA_NO_VARCHAR (1 << 27) /* Historical, no longer supported */
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#define HA_CAN_BIT_FIELD (1 << 28) /* Historical, no longer supported */
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#define HA_NEED_READ_RANGE_BUFFER (1 << 29) /* for read_multi_range */
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#define HA_ANY_INDEX_MAY_BE_UNIQUE (1 << 30)
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#define HA_NO_COPY_ON_ALTER (1LL << 31)
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#define HA_HAS_RECORDS (1LL << 32) /* records() gives exact count*/
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/* Has it's own method of binlog logging */
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#define HA_HAS_OWN_BINLOGGING (1LL << 33) /* Historical, no longer supported */
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#define HA_MRR_CANT_SORT (1LL << 34)
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Engine is capable of row-format and statement-format logging,
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#define HA_BINLOG_ROW_CAPABLE (1LL << 35)
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#define HA_BINLOG_STMT_CAPABLE (1LL << 36)
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#define HA_ONLINE_ALTER (1LL << 37)
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Set of all binlog flags. Currently only contain the capabilities
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#ifndef DRIZZLED_CURSOR_H
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#define DRIZZLED_CURSOR_H
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#include <drizzled/xid.h>
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#include <drizzled/discrete_interval.h>
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#include <drizzled/identifier.h>
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#include <drizzled/definitions.h>
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#include <drizzled/key_map.h>
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/* Definitions for parameters to do with Cursor-routines */
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#include <drizzled/thr_lock.h>
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#include <drizzled/sql_string.h>
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#include <drizzled/sql_list.h>
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#include <drizzled/plugin/storage_engine.h>
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#include <drizzled/handler_structs.h>
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#include <drizzled/ha_statistics.h>
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#include <drizzled/atomics.h>
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#include <drizzled/message/table.pb.h>
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#define HA_MAX_ALTER_FLAGS 40
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typedef std::bitset<HA_MAX_ALTER_FLAGS> HA_ALTER_FLAGS;
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extern uint64_t refresh_version; /* Increments on each reload */
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class Select_Lex_Unit;
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#define HA_BINLOG_FLAGS (HA_BINLOG_ROW_CAPABLE | HA_BINLOG_STMT_CAPABLE)
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/* bits in index_flags(index_number) for what you can do with index */
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#define HA_READ_NEXT 1 /* TODO really use this flag */
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#define HA_READ_PREV 2 /* supports ::index_prev */
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#define HA_READ_ORDER 4 /* index_next/prev follow sort order */
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#define HA_READ_RANGE 8 /* can find all records in a range */
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#define HA_ONLY_WHOLE_INDEX 16 /* Can't use part key searches */
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#define HA_KEYREAD_ONLY 64 /* Support HA_EXTRA_KEYREAD */
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Index scan will not return records in rowid order. Not guaranteed to be
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set for unordered (e.g. HASH) indexes.
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#define HA_KEY_SCAN_NOT_ROR 128
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#define HA_DO_INDEX_COND_PUSHDOWN 256 /* Supports Index Condition Pushdown */
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HA_PARTITION_FUNCTION_SUPPORTED indicates that the function is
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HA_FAST_CHANGE_PARTITION means that optimised variants of the changes
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exists but they are not necessarily done online.
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HA_ONLINE_DOUBLE_WRITE means that the handler supports writing to both
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the new partition and to the old partitions when updating through the
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old partitioning schema while performing a change of the partitioning.
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This means that we can support updating of the table while performing
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the copy phase of the change. For no lock at all also a double write
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from new to old must exist and this is not required when this flag is
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This is actually removed even before it was introduced the first time.
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The new idea is that handlers will handle the lock level already in
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store_lock for ALTER TABLE partitions.
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HA_PARTITION_ONE_PHASE is a flag that can be set by handlers that take
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care of changing the partitions online and in one phase. Thus all phases
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needed to handle the change are implemented inside the storage engine.
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The storage engine must also support auto-discovery since the frm file
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is changed as part of the change and this change must be controlled by
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the storage engine. A typical engine to support this is NDB (through
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#define HA_PARTITION_FUNCTION_SUPPORTED (1L << 1)
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#define HA_FAST_CHANGE_PARTITION (1L << 2)
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#define HA_PARTITION_ONE_PHASE (1L << 3)
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/* operations for disable/enable indexes */
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#define HA_KEY_SWITCH_NONUNIQ 0
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#define HA_KEY_SWITCH_ALL 1
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#define HA_KEY_SWITCH_NONUNIQ_SAVE 2
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#define HA_KEY_SWITCH_ALL_SAVE 3
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Note: the following includes binlog and closing 0.
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so: innodb + bdb + ndb + binlog + myisam + myisammrg + archive +
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example + csv + heap + blackhole + federated + 0
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(yes, the sum is deliberately inaccurate)
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TODO remove the limit, use dynarrays
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Parameters for open() (in register form->filestat)
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HA_GET_INFO does an implicit HA_ABORT_IF_LOCKED
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#define HA_OPEN_KEYFILE 1
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#define HA_OPEN_RNDFILE 2
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#define HA_GET_INDEX 4
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#define HA_GET_INFO 8 /* do a ha_info() after open */
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#define HA_READ_ONLY 16 /* File opened as readonly */
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/* Try readonly if can't open with read and write */
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#define HA_TRY_READ_ONLY 32
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#define HA_WAIT_IF_LOCKED 64 /* Wait if locked on open */
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#define HA_ABORT_IF_LOCKED 128 /* skip if locked on open.*/
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#define HA_BLOCK_LOCK 256 /* unlock when reading some records */
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#define HA_OPEN_TEMPORARY 512
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/* For transactional LOCK TABLE. handler::lock_table() */
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#define HA_LOCK_IN_SHARE_MODE F_RDLCK
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#define HA_LOCK_IN_EXCLUSIVE_MODE F_WRLCK
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/* Some key definitions */
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#define HA_KEY_NULL_LENGTH 1
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#define HA_KEY_BLOB_LENGTH 2
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#define HA_LEX_CREATE_TMP_TABLE 1
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#define HA_LEX_CREATE_IF_NOT_EXISTS 2
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#define HA_LEX_CREATE_TABLE_LIKE 4
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#define HA_OPTION_NO_CHECKSUM (1L << 17)
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#define HA_OPTION_NO_DELAY_KEY_WRITE (1L << 18)
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#define HA_MAX_REC_LENGTH 65535
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/* Table caching type */
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#define HA_CACHE_TBL_NONTRANSACT 0
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#define HA_CACHE_TBL_NOCACHE 1
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#define HA_CACHE_TBL_ASKTRANSACT 2
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#define HA_CACHE_TBL_TRANSACT 4
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/* Options of START TRANSACTION statement (and later of SET TRANSACTION stmt) */
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#define MYSQL_START_TRANS_OPT_WITH_CONS_SNAPSHOT 1
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/* Flags for method is_fatal_error */
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#define HA_CHECK_DUP_KEY 1
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#define HA_CHECK_DUP_UNIQUE 2
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#define HA_CHECK_DUP (HA_CHECK_DUP_KEY + HA_CHECK_DUP_UNIQUE)
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DB_TYPE_UNKNOWN=0,DB_TYPE_DIAB_ISAM=1,
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DB_TYPE_HASH,DB_TYPE_MISAM,DB_TYPE_PISAM,
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DB_TYPE_RMS_ISAM, DB_TYPE_HEAP, DB_TYPE_ISAM,
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DB_TYPE_MRG_ISAM, DB_TYPE_MYISAM, DB_TYPE_MRG_MYISAM,
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DB_TYPE_BERKELEY_DB, DB_TYPE_INNODB,
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DB_TYPE_GEMINI, DB_TYPE_NDBCLUSTER,
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DB_TYPE_EXAMPLE_DB, DB_TYPE_ARCHIVE_DB, DB_TYPE_CSV_DB,
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DB_TYPE_FEDERATED_DB,
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DB_TYPE_BLACKHOLE_DB,
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DB_TYPE_PARTITION_DB,
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DB_TYPE_TABLE_FUNCTION,
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DB_TYPE_FIRST_DYNAMIC=42,
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DB_TYPE_DEFAULT=127 // Must be last
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enum row_type { ROW_TYPE_NOT_USED=-1, ROW_TYPE_DEFAULT, ROW_TYPE_FIXED,
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ROW_TYPE_DYNAMIC, ROW_TYPE_COMPRESSED,
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ROW_TYPE_REDUNDANT, ROW_TYPE_COMPACT, ROW_TYPE_PAGE };
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enum column_format_type { COLUMN_FORMAT_TYPE_NOT_USED= -1,
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COLUMN_FORMAT_TYPE_DEFAULT= 0,
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COLUMN_FORMAT_TYPE_FIXED= 1,
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COLUMN_FORMAT_TYPE_DYNAMIC= 2 };
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enum enum_binlog_func {
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BFN_BINLOG_PURGE_FILE= 5
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enum enum_binlog_command {
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/* struct to hold information about the table that should be created */
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/* Bits in used_fields */
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#define HA_CREATE_USED_AUTO (1L << 0)
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#define HA_CREATE_USED_RAID (1L << 1) /* Historical, no longer supported */
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#define HA_CREATE_USED_UNION (1L << 2)
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#define HA_CREATE_USED_INSERT_METHOD (1L << 3)
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#define HA_CREATE_USED_MIN_ROWS (1L << 4)
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#define HA_CREATE_USED_MAX_ROWS (1L << 5)
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#define HA_CREATE_USED_AVG_ROW_LENGTH (1L << 6)
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#define HA_CREATE_USED_PACK_KEYS (1L << 7)
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#define HA_CREATE_USED_CHARSET (1L << 8)
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#define HA_CREATE_USED_DEFAULT_CHARSET (1L << 9)
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#define HA_CREATE_USED_DATADIR (1L << 10)
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#define HA_CREATE_USED_INDEXDIR (1L << 11)
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#define HA_CREATE_USED_ENGINE (1L << 12)
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#define HA_CREATE_USED_CHECKSUM (1L << 13)
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#define HA_CREATE_USED_DELAY_KEY_WRITE (1L << 14)
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#define HA_CREATE_USED_ROW_FORMAT (1L << 15)
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#define HA_CREATE_USED_COMMENT (1L << 16)
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#define HA_CREATE_USED_PASSWORD (1L << 17)
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#define HA_CREATE_USED_CONNECTION (1L << 18)
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#define HA_CREATE_USED_KEY_BLOCK_SIZE (1L << 19)
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#define HA_CREATE_USED_TRANSACTIONAL (1L << 20)
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#define HA_CREATE_USED_PAGE_CHECKSUM (1L << 21)
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typedef uint64_t my_xid; // this line is the same as in log_event.h
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#define MYSQL_XID_PREFIX "MySQLXid"
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#define MYSQL_XID_PREFIX_LEN 8 // must be a multiple of 8
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#define MYSQL_XID_OFFSET (MYSQL_XID_PREFIX_LEN+sizeof(server_id))
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#define MYSQL_XID_GTRID_LEN (MYSQL_XID_OFFSET+sizeof(my_xid))
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#define XIDDATASIZE MYSQL_XIDDATASIZE
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#define MAXGTRIDSIZE 64
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#define MAXBQUALSIZE 64
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#define COMPATIBLE_DATA_YES 0
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#define COMPATIBLE_DATA_NO 1
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struct xid_t is binary compatible with the XID structure as
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in the X/Open CAE Specification, Distributed Transaction Processing:
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The XA Specification, X/Open Company Ltd., 1991.
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http://www.opengroup.org/bookstore/catalog/c193.htm
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@see MYSQL_XID in mysql/plugin.h
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char data[XIDDATASIZE]; // not \0-terminated !
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xid_t() {} /* Remove gcc warning */
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bool eq(struct xid_t *xid)
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{ return eq(xid->gtrid_length, xid->bqual_length, xid->data); }
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bool eq(long g, long b, const char *d)
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{ return g == gtrid_length && b == bqual_length && !memcmp(d, data, g+b); }
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void set(struct xid_t *xid)
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{ memcpy(this, xid, xid->length()); }
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void set(long f, const char *g, long gl, const char *b, long bl)
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memcpy(data, g, gtrid_length= gl);
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memcpy(data+gl, b, bqual_length= bl);
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void set(uint64_t xid)
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set(MYSQL_XID_PREFIX_LEN, 0, MYSQL_XID_PREFIX);
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memcpy(data+MYSQL_XID_PREFIX_LEN, &server_id, sizeof(server_id));
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memcpy(data+MYSQL_XID_OFFSET, &tmp, sizeof(tmp));
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gtrid_length=MYSQL_XID_GTRID_LEN;
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void set(long g, long b, const char *d)
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memcpy(data, d, g+b);
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bool is_null() { return formatID == -1; }
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void null() { formatID= -1; }
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my_xid quick_get_my_xid()
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memcpy(&tmp, data+MYSQL_XID_OFFSET, sizeof(tmp));
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return gtrid_length == MYSQL_XID_GTRID_LEN && bqual_length == 0 &&
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!memcmp(data+MYSQL_XID_PREFIX_LEN, &server_id, sizeof(server_id)) &&
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!memcmp(data, MYSQL_XID_PREFIX, MYSQL_XID_PREFIX_LEN) ?
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quick_get_my_xid() : 0;
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return sizeof(formatID)+sizeof(gtrid_length)+sizeof(bqual_length)+
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gtrid_length+bqual_length;
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return (uchar *)>rid_length;
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return sizeof(gtrid_length)+sizeof(bqual_length)+gtrid_length+bqual_length;
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typedef struct xid_t XID;
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/* for recover() handlerton call */
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#define MIN_XID_LIST_SIZE 128
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#define MAX_XID_LIST_SIZE (1024*128)
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/* The handler for a table type. Will be included in the TABLE structure */
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typedef struct st_table TABLE;
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typedef struct st_table_share TABLE_SHARE;
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struct st_foreign_key_info;
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typedef struct st_foreign_key_info FOREIGN_KEY_INFO;
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typedef bool (stat_print_fn)(THD *thd, const char *type, uint type_len,
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const char *file, uint file_len,
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const char *status, uint status_len);
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enum ha_stat_type { HA_ENGINE_STATUS, HA_ENGINE_LOGS, HA_ENGINE_MUTEX };
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extern st_plugin_int *hton2plugin[MAX_HA];
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handlerton is a singleton structure - one instance per storage engine -
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to provide access to storage engine functionality that works on the
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"global" level (unlike handler class that works on a per-table basis)
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usually handlerton instance is defined statically in ha_xxx.cc as
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static handlerton { ... } xxx_hton;
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savepoint_*, prepare, recover, and *_by_xid pointers can be 0.
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Historical marker for if the engine is available of not
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SHOW_COMP_OPTION state;
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Historical number used for frm file to determine the correct storage engine.
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This is going away and new engines will just use "name" for this.
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enum legacy_db_type db_type;
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each storage engine has it's own memory area (actually a pointer)
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in the thd, for storing per-connection information.
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thd->ha_data[xxx_hton.slot]
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slot number is initialized by MySQL after xxx_init() is called.
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to store per-savepoint data storage engine is provided with an area
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of a requested size (0 is ok here).
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savepoint_offset must be initialized statically to the size of
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the needed memory to store per-savepoint information.
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After xxx_init it is changed to be an offset to savepoint storage
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area and need not be used by storage engine.
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see binlog_hton and binlog_savepoint_set/rollback for an example.
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uint savepoint_offset;
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close_connection is only called if
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thd->ha_data[xxx_hton.slot] is non-zero, so even if you don't need
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this storage area - set it to something, so that MySQL would know
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this storage engine was accessed in this connection
526
int (*close_connection)(handlerton *hton, THD *thd);
528
sv points to an uninitialized storage area of requested size
529
(see savepoint_offset description)
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int (*savepoint_set)(handlerton *hton, THD *thd, void *sv);
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sv points to a storage area, that was earlier passed
534
to the savepoint_set call
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int (*savepoint_rollback)(handlerton *hton, THD *thd, void *sv);
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int (*savepoint_release)(handlerton *hton, THD *thd, void *sv);
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'all' is true if it's a real commit, that makes persistent changes
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'all' is false if it's not in fact a commit but an end of the
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statement that is part of the transaction.
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NOTE 'all' is also false in auto-commit mode where 'end of statement'
543
and 'real commit' mean the same event.
545
int (*commit)(handlerton *hton, THD *thd, bool all);
546
int (*rollback)(handlerton *hton, THD *thd, bool all);
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int (*prepare)(handlerton *hton, THD *thd, bool all);
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int (*recover)(handlerton *hton, XID *xid_list, uint len);
549
int (*commit_by_xid)(handlerton *hton, XID *xid);
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int (*rollback_by_xid)(handlerton *hton, XID *xid);
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void *(*create_cursor_read_view)(handlerton *hton, THD *thd);
552
void (*set_cursor_read_view)(handlerton *hton, THD *thd, void *read_view);
553
void (*close_cursor_read_view)(handlerton *hton, THD *thd, void *read_view);
554
handler *(*create)(handlerton *hton, TABLE_SHARE *table, MEM_ROOT *mem_root);
555
void (*drop_database)(handlerton *hton, char* path);
556
int (*panic)(handlerton *hton, enum ha_panic_function flag);
557
int (*start_consistent_snapshot)(handlerton *hton, THD *thd);
558
bool (*flush_logs)(handlerton *hton);
559
bool (*show_status)(handlerton *hton, THD *thd, stat_print_fn *print, enum ha_stat_type stat);
560
int (*fill_files_table)(handlerton *hton, THD *thd,
563
uint32 flags; /* global handler flags */
564
int (*release_temporary_latches)(handlerton *hton, THD *thd);
566
int (*discover)(handlerton *hton, THD* thd, const char *db,
570
int (*table_exists_in_engine)(handlerton *hton, THD* thd, const char *db,
572
uint32 license; /* Flag for Engine License */
573
void *data; /* Location for engines to keep personal structures */
577
/* Possible flags of a handlerton (there can be 32 of them) */
578
#define HTON_NO_FLAGS 0
579
#define HTON_CLOSE_CURSORS_AT_COMMIT (1 << 0)
580
#define HTON_ALTER_NOT_SUPPORTED (1 << 1) //Engine does not support alter
581
#define HTON_CAN_RECREATE (1 << 2) //Delete all is used fro truncate
582
#define HTON_HIDDEN (1 << 3) //Engine does not appear in lists
583
#define HTON_FLUSH_AFTER_RENAME (1 << 4)
584
#define HTON_NOT_USER_SELECTABLE (1 << 5)
585
#define HTON_TEMPORARY_NOT_SUPPORTED (1 << 6) //Having temporary tables not supported
586
#define HTON_SUPPORT_LOG_TABLES (1 << 7) //Engine supports log tables
587
#define HTON_NO_PARTITION (1 << 8) //You can not partition these tables
593
/* true is not all entries in the ht[] support 2pc */
595
/* storage engines that registered in this transaction */
596
Ha_trx_info *ha_list;
598
The purpose of this flag is to keep track of non-transactional
599
tables that were modified in scope of:
600
- transaction, when the variable is a member of
602
- top-level statement or sub-statement, when the variable is a
603
member of THD::transaction.stmt
604
This member has the following life cycle:
605
* stmt.modified_non_trans_table is used to keep track of
606
modified non-transactional tables of top-level statements. At
607
the end of the previous statement and at the beginning of the session,
608
it is reset to FALSE. If such functions
609
as mysql_insert, mysql_update, mysql_delete etc modify a
610
non-transactional table, they set this flag to TRUE. At the
611
end of the statement, the value of stmt.modified_non_trans_table
612
is merged with all.modified_non_trans_table and gets reset.
613
* all.modified_non_trans_table is reset at the end of transaction
615
* Since we do not have a dedicated context for execution of a
616
sub-statement, to keep track of non-transactional changes in a
617
sub-statement, we re-use stmt.modified_non_trans_table.
618
At entrance into a sub-statement, a copy of the value of
619
stmt.modified_non_trans_table (containing the changes of the
620
outer statement) is saved on stack. Then
621
stmt.modified_non_trans_table is reset to FALSE and the
622
substatement is executed. Then the new value is merged with the
625
bool modified_non_trans_table;
627
void reset() { no_2pc= FALSE; modified_non_trans_table= FALSE; }
632
Either statement transaction or normal transaction - related
633
thread-specific storage engine data.
635
If a storage engine participates in a statement/transaction,
636
an instance of this class is present in
637
thd->transaction.{stmt|all}.ha_list. The addition to
638
{stmt|all}.ha_list is made by trans_register_ha().
640
When it's time to commit or rollback, each element of ha_list
641
is used to access storage engine's prepare()/commit()/rollback()
642
methods, and also to evaluate if a full two phase commit is
645
@sa General description of transaction handling in handler.cc.
651
/** Register this storage engine in the given transaction context. */
652
void register_ha(THD_TRANS *trans, handlerton *ht_arg)
654
DBUG_ASSERT(m_flags == 0);
655
DBUG_ASSERT(m_ht == NULL);
656
DBUG_ASSERT(m_next == NULL);
659
m_flags= (int) TRX_READ_ONLY; /* Assume read-only at start. */
661
m_next= trans->ha_list;
662
trans->ha_list= this;
665
/** Clear, prepare for reuse. */
673
Ha_trx_info() { reset(); }
675
void set_trx_read_write()
677
DBUG_ASSERT(is_started());
678
m_flags|= (int) TRX_READ_WRITE;
680
bool is_trx_read_write() const
682
DBUG_ASSERT(is_started());
683
return m_flags & (int) TRX_READ_WRITE;
685
bool is_started() const { return m_ht != NULL; }
686
/** Mark this transaction read-write if the argument is read-write. */
687
void coalesce_trx_with(const Ha_trx_info *stmt_trx)
690
Must be called only after the transaction has been started.
691
Can be called many times, e.g. when we have many
692
read-write statements in a transaction.
694
DBUG_ASSERT(is_started());
695
if (stmt_trx->is_trx_read_write())
696
set_trx_read_write();
698
Ha_trx_info *next() const
700
DBUG_ASSERT(is_started());
703
handlerton *ht() const
705
DBUG_ASSERT(is_started());
709
enum { TRX_READ_ONLY= 0, TRX_READ_WRITE= 1 };
710
/** Auxiliary, used for ha_list management */
713
Although a given Ha_trx_info instance is currently always used
714
for the same storage engine, 'ht' is not-NULL only when the
715
corresponding storage is a part of a transaction.
719
Transaction flags related to this engine.
720
Not-null only if this instance is a part of transaction.
721
May assume a combination of enum values above.
727
enum enum_tx_isolation { ISO_READ_UNCOMMITTED, ISO_READ_COMMITTED,
728
ISO_REPEATABLE_READ, ISO_SERIALIZABLE};
731
enum ndb_distribution { ND_KEYHASH= 0, ND_LINHASH= 1 };
735
uint64_t data_file_length;
736
uint64_t max_data_file_length;
737
uint64_t index_file_length;
738
uint64_t delete_length;
740
uint32_t mean_rec_length;
747
#define UNDEF_NODEGROUP 65535
70
typedef List<Item> List_item;
749
struct st_table_log_memory_entry;
751
#define NOT_A_PARTITION_ID ((uint32)-1)
753
enum ha_choice { HA_CHOICE_UNDEF, HA_CHOICE_NO, HA_CHOICE_YES };
755
typedef struct st_ha_create_information
757
CHARSET_INFO *table_charset, *default_table_charset;
758
LEX_STRING connect_string;
760
const char *data_file_name, *index_file_name;
762
uint64_t max_rows,min_rows;
763
uint64_t auto_increment_value;
764
uint32_t table_options;
765
uint32_t avg_row_length;
766
uint32_t used_fields;
767
uint32_t key_block_size;
770
enum row_type row_type;
771
uint null_bits; /* NULL bits at start of record */
772
uint options; /* OR of HA_CREATE_ options */
773
uint merge_insert_method;
774
uint extra_size; /* length of extra data segment */
775
/* 0 not used, 1 if not transactional, 2 if transactional */
776
enum ha_choice transactional;
777
bool table_existed; /* 1 in create if table existed */
778
bool frm_only; /* 1 if no ha_create_table() */
779
bool varchar; /* 1 if table has a VARCHAR */
780
enum ha_choice page_checksum; /* If we have page_checksums */
783
typedef struct st_ha_alter_information
785
KEY *key_info_buffer;
787
uint index_drop_count;
788
uint *index_drop_buffer;
789
uint index_add_count;
790
uint *index_add_buffer;
795
typedef struct st_key_create_information
797
enum ha_key_alg algorithm;
799
LEX_STRING parser_name;
805
Class for maintaining hooks used inside operations on tables such
806
as: create table functions, delete table functions, and alter table
809
Class is using the Template Method pattern to separate the public
810
usage interface from the private inheritance interface. This
811
imposes no overhead, since the public non-virtual function is small
812
enough to be inlined.
814
The hooks are usually used for functions that does several things,
815
e.g., create_table_from_items(), which both create a table and lock
822
virtual ~TABLEOP_HOOKS() {}
824
inline void prelock(TABLE **tables, uint count)
826
do_prelock(tables, count);
829
inline int postlock(TABLE **tables, uint count)
831
return do_postlock(tables, count);
834
/* Function primitive that is called prior to locking tables */
835
virtual void do_prelock(TABLE **tables __attribute__((__unused__)),
836
uint count __attribute__((__unused__)))
838
/* Default is to do nothing */
842
Primitive called after tables are locked.
844
If an error is returned, the tables will be unlocked and error
847
@return Error code or zero.
849
virtual int do_postlock(TABLE **tables __attribute__((__unused__)),
850
uint count __attribute__((__unused__)))
852
return 0; /* Default is to do nothing */
856
typedef struct st_savepoint SAVEPOINT;
857
extern uint32_t savepoint_alloc_size;
71
858
extern KEY_CREATE_INFO default_key_create_info;
73
860
/* Forward declaration for condition pushdown to storage engine */
74
861
typedef class Item COND;
76
typedef struct system_status_var system_status_var;
863
typedef struct st_ha_check_opt
865
st_ha_check_opt() {} /* Remove gcc warning */
866
uint32_t sort_buffer_size;
867
uint flags; /* isam layer flags (e.g. for myisamchk) */
868
uint sql_flags; /* sql layer flags - for something myisamchk cannot do */
869
KEY_CACHE *key_cache; /* new key cache when changing key cache */
876
This is a buffer area that the handler can use to store rows.
877
'end_of_used_area' should be kept updated after calls to
878
read-functions so that other parts of the code can use the
879
remaining area (until next read calls is issued).
882
typedef struct st_handler_buffer
884
uchar *buffer; /* Buffer one can start using */
885
uchar *buffer_end; /* End of buffer */
886
uchar *end_of_used_area; /* End of area that was used by handler */
889
typedef struct system_status_var SSV;
892
typedef void *range_seq_t;
894
typedef struct st_range_seq_if
897
Initialize the traversal of range sequence
901
init_params The seq_init_param parameter
902
n_ranges The number of ranges obtained
903
flags A combination of HA_MRR_SINGLE_POINT, HA_MRR_FIXED_KEY
906
An opaque value to be used as RANGE_SEQ_IF::next() parameter
908
range_seq_t (*init)(void *init_params, uint n_ranges, uint flags);
912
Get the next range in the range sequence
916
seq The value returned by RANGE_SEQ_IF::init()
917
range OUT Information about the next range
920
0 - Ok, the range structure filled with info about the next range
923
uint (*next) (range_seq_t seq, KEY_MULTI_RANGE *range);
926
uint16 &mrr_persistent_flag_storage(range_seq_t seq, uint idx);
927
char* &mrr_get_ptr_by_idx(range_seq_t seq, uint idx);
932
double io_count; /* number of I/O */
933
double avg_io_cost; /* cost of an average I/O oper. */
934
double cpu_cost; /* cost of operations in CPU */
935
double mem_cost; /* cost of used memory */
936
double import_cost; /* cost of remote operations */
939
enum { CPU_COEFF=1 };
940
enum { MEM_COEFF=1 };
941
enum { IMPORT_COEFF=1 };
943
COST_VECT() {} // keep gcc happy
947
return IO_COEFF*io_count*avg_io_cost + CPU_COEFF * cpu_cost +
948
MEM_COEFF*mem_cost + IMPORT_COEFF*import_cost;
954
io_count= cpu_cost= mem_cost= import_cost= 0.0;
957
void multiply(double m)
962
/* Don't multiply mem_cost */
965
void add(const COST_VECT* cost)
967
double io_count_sum= io_count + cost->io_count;
968
add_io(cost->io_count, cost->avg_io_cost);
969
io_count= io_count_sum;
970
cpu_cost += cost->cpu_cost;
972
void add_io(double add_io_cnt, double add_avg_cost)
974
double io_count_sum= io_count + add_io_cnt;
975
avg_io_cost= (io_count * avg_io_cost +
976
add_io_cnt * add_avg_cost) / io_count_sum;
977
io_count= io_count_sum;
981
void get_sweep_read_cost(TABLE *table, ha_rows nrows, bool interrupted,
985
The below two are not used (and not handled) in this milestone of this WL
986
entry because there seems to be no use for them at this stage of
989
#define HA_MRR_SINGLE_POINT 1
990
#define HA_MRR_FIXED_KEY 2
993
Indicates that RANGE_SEQ_IF::next(&range) doesn't need to fill in the
996
#define HA_MRR_NO_ASSOCIATION 4
999
The MRR user will provide ranges in key order, and MRR implementation
1000
must return rows in key order.
1002
#define HA_MRR_SORTED 8
1004
/* MRR implementation doesn't have to retrieve full records */
1005
#define HA_MRR_INDEX_ONLY 16
1008
The passed memory buffer is of maximum possible size, the caller can't
1009
assume larger buffer.
1011
#define HA_MRR_LIMITS 32
1015
Flag set <=> default MRR implementation is used
1016
(The choice is made by **_info[_const]() function which may set this
1017
flag. SQL layer remembers the flag value and then passes it to
1018
multi_read_range_init().
1020
#define HA_MRR_USE_DEFAULT_IMPL 64
1023
Used only as parameter to multi_range_read_info():
1024
Flag set <=> the caller guarantees that the bounds of the scanned ranges
1025
will not have NULL values.
1027
#define HA_MRR_NO_NULL_ENDPOINTS 128
1033
uint64_t data_file_length; /* Length off data file */
1034
uint64_t max_data_file_length; /* Length off data file */
1035
uint64_t index_file_length;
1036
uint64_t max_index_file_length;
1037
uint64_t delete_length; /* Free bytes */
1038
uint64_t auto_increment_value;
1040
The number of records in the table.
1041
0 - means the table has exactly 0 rows
1042
other - if (table_flags() & HA_STATS_RECORDS_IS_EXACT)
1043
the value is the exact number of records in the table
1048
ha_rows deleted; /* Deleted records */
1049
uint32_t mean_rec_length; /* physical reclength */
1050
time_t create_time; /* When table was created */
1053
uint block_size; /* index block size */
1056
data_file_length(0), max_data_file_length(0),
1057
index_file_length(0), delete_length(0), auto_increment_value(0),
1058
records(0), deleted(0), mean_rec_length(0), create_time(0),
1059
check_time(0), update_time(0), block_size(0)
1063
uint calculate_key_len(TABLE *, uint, const uchar *, key_part_map);
84
1065
bitmap with first N+1 bits set
85
1066
(keypart_map for a key prefix of [0..N] keyparts)
88
inline key_part_map make_keypart_map(T a)
90
return (((key_part_map)2 << a) - 1);
1068
#define make_keypart_map(N) (((key_part_map)2 << (N)) - 1)
94
1070
bitmap with first N bits set
95
1071
(keypart_map for a key prefix of [0..N-1] keyparts)
98
inline key_part_map make_prev_keypart_map(T a)
100
return (((key_part_map)1 << a) - 1);
1073
#define make_prev_keypart_map(N) (((key_part_map)1 << (N)) - 1)
104
The Cursor class is the interface for dynamically loadable
1076
The handler class is the interface for dynamically loadable
105
1077
storage engines. Do not add ifdefs and take care when adding or
106
1078
changing virtual functions to avoid vtable confusion
225
1198
Discrete_interval auto_inc_interval_for_cur_row;
227
Cursor(plugin::StorageEngine &engine_arg, Table &share_arg);
228
virtual ~Cursor(void);
229
virtual Cursor *clone(memory::Root *mem_root);
1200
handler(handlerton *ht_arg, TABLE_SHARE *share_arg)
1201
:table_share(share_arg), table(0),
1202
estimation_rows_to_insert(0), ht(ht_arg),
1203
ref(0), in_range_check_pushed_down(FALSE),
1204
key_used_on_scan(MAX_KEY), active_index(MAX_KEY),
1205
ref_length(sizeof(my_off_t)),
1206
ft_handler(0), inited(NONE),
1207
locked(FALSE), implicit_emptied(0),
1208
pushed_cond(0), pushed_idx_cond(NULL), pushed_idx_cond_keyno(MAX_KEY),
1209
next_insert_id(0), insert_id_for_cur_row(0)
1211
virtual ~handler(void)
1213
DBUG_ASSERT(locked == FALSE);
1214
/* TODO: DBUG_ASSERT(inited == NONE); */
1216
virtual handler *clone(MEM_ROOT *mem_root);
1217
/** This is called after create to allow us to set up cached variables */
1220
cached_table_flags= table_flags();
231
1222
/* ha_ methods: pubilc wrappers for private virtual API */
233
int ha_open(const TableIdentifier &identifier, int mode, int test_if_locked);
234
int startIndexScan(uint32_t idx, bool sorted);
236
int startTableScan(bool scan);
1224
int ha_open(TABLE *table, const char *name, int mode, int test_if_locked);
1225
int ha_index_init(uint idx, bool sorted)
1228
DBUG_ENTER("ha_index_init");
1229
DBUG_ASSERT(inited==NONE);
1230
if (!(result= index_init(idx, sorted)))
1233
DBUG_RETURN(result);
1237
DBUG_ENTER("ha_index_end");
1238
DBUG_ASSERT(inited==INDEX);
1241
DBUG_RETURN(index_end());
1243
int ha_rnd_init(bool scan)
1246
DBUG_ENTER("ha_rnd_init");
1247
DBUG_ASSERT(inited==NONE || (inited==RND && scan));
1248
inited= (result= rnd_init(scan)) ? NONE: RND;
1249
DBUG_RETURN(result);
1253
DBUG_ENTER("ha_rnd_end");
1254
DBUG_ASSERT(inited==RND);
1256
DBUG_RETURN(rnd_end());
240
1259
/* this is necessary in many places, e.g. in HANDLER command */
241
int ha_index_or_rnd_end();
1260
int ha_index_or_rnd_end()
1262
return inited == INDEX ? ha_index_end() : inited == RND ? ha_rnd_end() : 0;
1264
Table_flags ha_table_flags() const { return cached_table_flags; }
244
1266
These functions represent the public interface to *users* of the
245
Cursor class, hence they are *not* virtual. For the inheritance
246
interface, see the (private) functions doInsertRecord(), doUpdateRecord(),
247
and doDeleteRecord() below.
1267
handler class, hence they are *not* virtual. For the inheritance
1268
interface, see the (private) functions write_row(), update_row(),
1269
and delete_row() below.
249
int ha_external_lock(Session *session, int lock_type);
250
int insertRecord(unsigned char * buf);
251
int updateRecord(const unsigned char * old_data, unsigned char * new_data);
252
int deleteRecord(const unsigned char * buf);
1271
int ha_external_lock(THD *thd, int lock_type);
1272
int ha_write_row(uchar * buf);
1273
int ha_update_row(const uchar * old_data, uchar * new_data);
1274
int ha_delete_row(const uchar * buf);
253
1275
void ha_release_auto_increment();
1277
int ha_check_for_upgrade(HA_CHECK_OPT *check_opt);
255
1278
/** to be actually called to get 'check()' functionality*/
256
int ha_check(Session *session, HA_CHECK_OPT *check_opt);
258
void ha_start_bulk_insert(ha_rows rows);
259
int ha_end_bulk_insert();
1279
int ha_check(THD *thd, HA_CHECK_OPT *check_opt);
1280
int ha_repair(THD* thd, HA_CHECK_OPT* check_opt);
1281
void ha_start_bulk_insert(ha_rows rows)
1283
estimation_rows_to_insert= rows;
1284
start_bulk_insert(rows);
1286
int ha_end_bulk_insert()
1288
estimation_rows_to_insert= 0;
1289
return end_bulk_insert();
1291
int ha_bulk_update_row(const uchar *old_data, uchar *new_data,
1292
uint *dup_key_found);
260
1293
int ha_delete_all_rows();
261
1294
int ha_reset_auto_increment(uint64_t value);
262
int ha_analyze(Session* session, HA_CHECK_OPT* check_opt);
264
int ha_disable_indexes(uint32_t mode);
265
int ha_enable_indexes(uint32_t mode);
266
int ha_discard_or_import_tablespace(bool discard);
267
void closeMarkForDelete(const char *name);
1295
int ha_optimize(THD* thd, HA_CHECK_OPT* check_opt);
1296
int ha_analyze(THD* thd, HA_CHECK_OPT* check_opt);
1297
bool ha_check_and_repair(THD *thd);
1298
int ha_disable_indexes(uint mode);
1299
int ha_enable_indexes(uint mode);
1300
int ha_discard_or_import_tablespace(my_bool discard);
1301
void ha_prepare_for_alter();
1302
int ha_rename_table(const char *from, const char *to);
1303
int ha_delete_table(const char *name);
1304
void ha_drop_table(const char *name);
1306
int ha_create(const char *name, TABLE *form, HA_CREATE_INFO *info);
1308
int ha_create_handler_files(const char *name, const char *old_name,
1309
int action_flag, HA_CREATE_INFO *info);
269
1311
void adjust_next_insert_id_after_explicit_value(uint64_t nr);
270
1312
int update_auto_increment();
1313
void print_keydup_error(uint key_nr, const char *msg);
1314
virtual void print_error(int error, myf errflag);
1315
virtual bool get_error_message(int error, String *buf);
1316
uint get_dup_key(int error);
1317
virtual void change_table_ptr(TABLE *table_arg, TABLE_SHARE *share)
272
1322
/* Estimates calculation */
273
1323
virtual double scan_time(void)
274
{ return uint64_t2double(stats.data_file_length) / IO_SIZE + 2; }
275
virtual double read_time(uint32_t, uint32_t ranges, ha_rows rows)
1324
{ return ulonglong2double(stats.data_file_length) / IO_SIZE + 2; }
1325
virtual double read_time(uint index __attribute__((__unused__)),
1326
uint ranges, ha_rows rows)
276
1327
{ return rows2double(ranges+rows); }
278
virtual double index_only_read_time(uint32_t keynr, double records);
280
virtual ha_rows multi_range_read_info_const(uint32_t keyno, RANGE_SEQ_IF *seq,
281
void *seq_init_param,
282
uint32_t n_ranges, uint32_t *bufsz,
283
uint32_t *flags, optimizer::CostVector *cost);
284
virtual int multi_range_read_info(uint32_t keyno, uint32_t n_ranges, uint32_t keys,
285
uint32_t *bufsz, uint32_t *flags, optimizer::CostVector *cost);
1329
virtual double index_only_read_time(uint keynr, double records);
1331
virtual ha_rows multi_range_read_info_const(uint keyno, RANGE_SEQ_IF *seq,
1332
void *seq_init_param,
1333
uint n_ranges, uint *bufsz,
1334
uint *flags, COST_VECT *cost);
1335
virtual int multi_range_read_info(uint keyno, uint n_ranges, uint keys,
1336
uint *bufsz, uint *flags, COST_VECT *cost);
286
1337
virtual int multi_range_read_init(RANGE_SEQ_IF *seq, void *seq_init_param,
287
uint32_t n_ranges, uint32_t mode);
1338
uint n_ranges, uint mode,
1339
HANDLER_BUFFER *buf);
288
1340
virtual int multi_range_read_next(char **range_info);
291
virtual const key_map *keys_to_use_for_scanning();
292
bool has_transactions();
1343
virtual const key_map *keys_to_use_for_scanning() { return &key_map_empty; }
1344
bool has_transactions()
1345
{ return (ha_table_flags() & HA_NO_TRANSACTIONS) == 0; }
1346
virtual uint extra_rec_buf_length() const { return 0; }
295
1349
This method is used to analyse the error to see whether the error
296
1350
is ignorable or not, certain handlers can have more error that are
297
ignorable than others. E.g. the partition Cursor can get inserts
1351
ignorable than others. E.g. the partition handler can get inserts
298
1352
into a range where there is no partition and this is an ignorable
300
1354
HA_ERR_FOUND_DUP_UNIQUE is a special case in MyISAM that means the
301
1355
same thing as HA_ERR_FOUND_DUP_KEY but can in some cases lead to
302
1356
a slightly different error message.
304
virtual bool is_fatal_error(int error, uint32_t flags);
1358
virtual bool is_fatal_error(int error, uint flags)
1361
((flags & HA_CHECK_DUP_KEY) &&
1362
(error == HA_ERR_FOUND_DUPP_KEY ||
1363
error == HA_ERR_FOUND_DUPP_UNIQUE)))
307
1369
Number of rows in table. It will only be called if
308
1370
(table_flags() & (HA_HAS_RECORDS | HA_STATS_RECORDS_IS_EXACT)) != 0
310
virtual ha_rows records();
311
virtual uint64_t tableSize();
312
virtual uint64_t rowSize();
1372
virtual ha_rows records() { return stats.records; }
314
1374
Return upper bound of current number of records in the table
315
1375
(max. of how many records one will retrieve when doing a full table scan)
477
1699
@note that one can NOT rely on table->in_use in store_lock(). It may
478
refer to a different thread if called from abortLockForThread().
1700
refer to a different thread if called from mysql_lock_abort_for_thread().
480
1702
@note If the table is MERGE, store_lock() can return less locks
481
1703
than lock_count() claimed. This can happen when the MERGE children
482
1704
are not attached when this is called from another thread.
484
virtual THR_LOCK_DATA **store_lock(Session *,
1706
virtual THR_LOCK_DATA **store_lock(THD *thd,
485
1707
THR_LOCK_DATA **to,
1708
enum thr_lock_type lock_type)=0;
1710
/** Type of table for caching query */
1711
virtual uint8 table_cache_type() { return HA_CACHE_TBL_NONTRANSACT; }
1715
@brief Register a named table with a call back function to the query cache.
1717
@param thd The thread handle
1718
@param table_key A pointer to the table name in the table cache
1719
@param key_length The length of the table name
1720
@param[out] engine_callback The pointer to the storage engine call back
1722
@param[out] engine_data Storage engine specific data which could be
1725
This method offers the storage engine, the possibility to store a reference
1726
to a table name which is going to be used with query cache.
1727
The method is called each time a statement is written to the cache and can
1728
be used to verify if a specific statement is cachable. It also offers
1729
the possibility to register a generic (but static) call back function which
1730
is called each time a statement is matched against the query cache.
1732
@note If engine_data supplied with this function is different from
1733
engine_data supplied with the callback function, and the callback returns
1734
FALSE, a table invalidation on the current table will occur.
1736
@return Upon success the engine_callback will point to the storage engine
1737
call back function, if any, and engine_data will point to any storage
1738
engine data used in the specific implementation.
1739
@retval TRUE Success
1740
@retval FALSE The specified table or current statement should not be
1745
register_query_cache_table(THD *thd __attribute__((__unused__)),
1746
char *table_key __attribute__((__unused__)),
1747
uint key_length __attribute__((__unused__)),
1748
qc_engine_callback *engine_callback,
1749
uint64_t *engine_data __attribute__((__unused__)))
488
assert(0); // Impossible programming situation
1751
*engine_callback= 0;
494
@retval true Primary key (if there is one) is clustered
1757
@retval TRUE Primary key (if there is one) is clustered
495
1758
key covering all fields
496
@retval false otherwise
1759
@retval FALSE otherwise
498
virtual bool primary_key_is_clustered() { return false; }
499
virtual int cmp_ref(const unsigned char *ref1, const unsigned char *ref2)
1761
virtual bool primary_key_is_clustered() { return FALSE; }
1762
virtual int cmp_ref(const uchar *ref1, const uchar *ref2)
501
1764
return memcmp(ref1, ref2, ref_length);
504
virtual bool isOrdered(void)
1768
Condition pushdown to storage engines
1772
Push condition down to the table handler.
1774
@param cond Condition to be pushed. The condition tree must not be
1775
modified by the by the caller.
1778
The 'remainder' condition that caller must use to filter out records.
1779
NULL means the handler will not return rows that do not match the
1783
The pushed conditions form a stack (from which one can remove the
1784
last pushed condition using cond_pop).
1785
The table handler filters out rows using (pushed_cond1 AND pushed_cond2
1786
AND ... AND pushed_condN)
1787
or less restrictive condition, depending on handler's capabilities.
1789
handler->ha_reset() call empties the condition stack.
1790
Calls to rnd_init/rnd_end, index_init/index_end etc do not affect the
1793
virtual const COND *cond_push(const COND *cond) { return cond; }
1796
Pop the top condition from the condition stack of the handler instance.
1798
Pops the top if condition stack, if stack is not empty.
1800
virtual void cond_pop(void) { return; }
1803
*idx_cond_push(uint keyno __attribute__((__unused__)),
1804
Item* idx_cond __attribute__((__unused__)))
1805
{ return idx_cond; }
1808
Part of old fast alter table, to be depricated
1811
check_if_incompatible_data(HA_CREATE_INFO *create_info __attribute__((__unused__)),
1812
uint table_changes __attribute__((__unused__)))
1813
{ return COMPATIBLE_DATA_NO; }
1815
/* On-line ALTER TABLE interface */
1818
Check if a storage engine supports a particular alter table on-line
1820
@param altered_table A temporary table show what table is to
1822
@param create_info Information from the parsing phase about new
1824
@param alter_flags Bitmask that shows what will be changed
1825
@param table_changes Shows if table layout has changed (for
1826
backwards compatibility with
1827
check_if_incompatible_data
1829
@retval HA_ALTER_ERROR Unexpected error
1830
@retval HA_ALTER_SUPPORTED_WAIT_LOCK Supported, but requires DDL lock
1831
@retval HA_ALTER_SUPPORTED_NO_LOCK Supported
1832
@retval HA_ALTER_NOT_SUPPORTED Not supported
1835
The default implementation is implemented to support fast
1836
alter table (storage engines that support some changes by
1837
just changing the frm file) without any change in the handler
1841
check_if_supported_alter(TABLE *altered_table __attribute__((__unused__)),
1842
HA_CREATE_INFO *create_info,
1843
HA_ALTER_FLAGS *alter_flags __attribute__((__unused__)),
1846
DBUG_ENTER("check_if_supported_alter");
1847
if (this->check_if_incompatible_data(create_info, table_changes)
1848
== COMPATIBLE_DATA_NO)
1849
DBUG_RETURN(HA_ALTER_NOT_SUPPORTED);
1851
DBUG_RETURN(HA_ALTER_SUPPORTED_WAIT_LOCK);
1854
Tell storage engine to prepare for the on-line alter table (pre-alter)
1856
@param thd The thread handle
1857
@param altered_table A temporary table show what table is to
1859
@param alter_info Storage place for data used during phase1
1861
@param alter_flags Bitmask that shows what will be changed
1864
@retval error error code passed from storage engine
1866
virtual int alter_table_phase1(THD *thd __attribute__((__unused__)),
1867
TABLE *altered_table __attribute__((__unused__)),
1868
HA_CREATE_INFO *create_info __attribute__((__unused__)),
1869
HA_ALTER_INFO *alter_info __attribute__((__unused__)),
1870
HA_ALTER_FLAGS *alter_flags __attribute__((__unused__)))
1872
return HA_ERR_UNSUPPORTED;
1875
Tell storage engine to perform the on-line alter table (alter)
1877
@param thd The thread handle
1878
@param altered_table A temporary table show what table is to
1880
@param alter_info Storage place for data used during phase1
1882
@param alter_flags Bitmask that shows what will be changed
1885
@retval error error code passed from storage engine
1888
If check_if_supported_alter returns HA_ALTER_SUPPORTED_WAIT_LOCK
1889
this call is to be wrapped with a DDL lock. This is currently NOT
1892
virtual int alter_table_phase2(THD *thd __attribute__((__unused__)),
1893
TABLE *altered_table __attribute__((__unused__)),
1894
HA_CREATE_INFO *create_info __attribute__((__unused__)),
1895
HA_ALTER_INFO *alter_info __attribute__((__unused__)),
1896
HA_ALTER_FLAGS *alter_flags __attribute__((__unused__)))
1898
return HA_ERR_UNSUPPORTED;
1901
Tell storage engine that changed frm file is now on disk and table
1902
has been re-opened (post-alter)
1904
@param thd The thread handle
1905
@param table The altered table, re-opened
1907
virtual int alter_table_phase3(THD *thd __attribute__((__unused__)),
1908
TABLE *table __attribute__((__unused__)))
1910
return HA_ERR_UNSUPPORTED;
1914
use_hidden_primary_key() is called in case of an update/delete when
1915
(table_flags() and HA_PRIMARY_KEY_REQUIRED_FOR_DELETE) is defined
1916
but we don't have a primary key
1918
virtual void use_hidden_primary_key();
1923
@param thd Thread handle
1924
@param lock_type HA_LOCK_IN_SHARE_MODE (F_RDLCK)
1925
HA_LOCK_IN_EXCLUSIVE_MODE (F_WRLCK)
1926
@param lock_timeout -1 default timeout
1928
>0 wait timeout in milliseconds.
1931
lock_timeout >0 is not used by MySQL currently. If the storage
1932
engine does not support NOWAIT (lock_timeout == 0) it should
1933
return an error. But if it does not support WAIT X (lock_timeout
1934
>0) it should treat it as lock_timeout == -1 and wait a default
1935
(or even hard-coded) timeout.
1937
@retval HA_ERR_WRONG_COMMAND Storage engine does not support
1939
@retval HA_ERR_UNSUPPORTED Storage engine does not support NOWAIT
1940
@retval HA_ERR_LOCK_WAIT_TIMEOUT Lock request timed out or
1941
lock conflict with NOWAIT option
1942
@retval HA_ERR_LOCK_DEADLOCK Deadlock detected
1944
virtual int lock_table(THD *thd __attribute__((unused)),
1945
int lock_type __attribute__((unused)),
1946
int lock_timeout __attribute__((unused)))
1948
return HA_ERR_WRONG_COMMAND;
511
1952
/* Service methods for use by storage engines. */
512
void ha_statistic_increment(uint64_t system_status_var::*offset) const;
513
void **ha_data(Session *) const;
1953
void ha_statistic_increment(ulong SSV::*offset) const;
1954
void **ha_data(THD *) const;
1955
THD *ha_thd(void) const;
1958
Default rename_table() and delete_table() rename/delete files with a
1959
given name and extensions from bas_ext().
1961
These methods can be overridden, but their default implementation
1962
provide useful functionality.
1964
virtual int rename_table(const char *from, const char *to);
1966
Delete a table in the engine. Called for base as well as temporary
1969
virtual int delete_table(const char *name);
516
1972
/* Private helpers */
517
inline void setTransactionReadWrite();
1973
inline void mark_trx_read_write();
520
1976
Low-level primitives for storage engines. These should be
579
2037
@return non-0 in case of failure, 0 in case of success.
580
2038
When lock_type is F_UNLCK, the return value is ignored.
582
virtual int external_lock(Session *, int)
2040
virtual int external_lock(THD *thd __attribute__((unused)),
2041
int lock_type __attribute__((unused)))
586
virtual void release_auto_increment(void) { return; }
2045
virtual void release_auto_increment(void) { return; };
587
2046
/** admin commands - called from mysql_admin_table */
588
virtual int check(Session *)
2047
virtual int check_for_upgrade(HA_CHECK_OPT *check_opt __attribute__((__unused__)))
2049
virtual int check(THD* thd __attribute__((__unused__)),
2050
HA_CHECK_OPT* check_opt __attribute__((__unused__)))
589
2051
{ return HA_ADMIN_NOT_IMPLEMENTED; }
591
virtual void start_bulk_insert(ha_rows)
2054
In this method check_opt can be modified
2055
to specify CHECK option to use to call check()
2058
virtual int repair(THD* thd __attribute__((__unused__)),
2059
HA_CHECK_OPT* check_opt __attribute__((__unused__)))
2060
{ return HA_ADMIN_NOT_IMPLEMENTED; }
2061
virtual void start_bulk_insert(ha_rows rows __attribute__((__unused__)))
593
2063
virtual int end_bulk_insert(void) { return 0; }
594
virtual int index_read(unsigned char *, const unsigned char *,
595
uint32_t, enum ha_rkey_function)
2064
virtual int index_read(uchar * buf __attribute__((__unused__)),
2065
const uchar * key __attribute__((__unused__)),
2066
uint key_len __attribute__((__unused__)),
2067
enum ha_rkey_function find_flag __attribute__((__unused__)))
596
2068
{ return HA_ERR_WRONG_COMMAND; }
597
virtual int index_read_last(unsigned char *, const unsigned char *, uint32_t)
598
{ return (errno= HA_ERR_WRONG_COMMAND); }
2069
virtual int index_read_last(uchar * buf __attribute__((__unused__)),
2070
const uchar * key __attribute__((__unused__)),
2071
uint key_len __attribute__((__unused__)))
2072
{ return (my_errno= HA_ERR_WRONG_COMMAND); }
2074
This method is similar to update_row, however the handler doesn't need
2075
to execute the updates at this point in time. The handler can be certain
2076
that another call to bulk_update_row will occur OR a call to
2077
exec_bulk_update before the set of updates in this query is concluded.
2079
@param old_data Old record
2080
@param new_data New record
2081
@param dup_key_found Number of duplicate keys found
2083
@retval 0 Bulk delete used by handler
2084
@retval 1 Bulk delete not used, normal operation used
2086
virtual int bulk_update_row(const uchar *old_data __attribute__((__unused__)),
2087
uchar *new_data __attribute__((__unused__)),
2088
uint *dup_key_found __attribute__((__unused__)))
2091
return HA_ERR_WRONG_COMMAND;
600
2094
This is called to delete all rows in a table
601
If the Cursor don't support this, then this function will
2095
If the handler don't support this, then this function will
602
2096
return HA_ERR_WRONG_COMMAND and MySQL will delete the rows one
605
2099
virtual int delete_all_rows(void)
606
{ return (errno=HA_ERR_WRONG_COMMAND); }
2100
{ return (my_errno=HA_ERR_WRONG_COMMAND); }
608
2102
Reset the auto-increment counter to the given value, i.e. the next row
609
2103
inserted will get the given value. This is called e.g. after TRUNCATE
610
2104
is emulated by doing a 'DELETE FROM t'. HA_ERR_WRONG_COMMAND is
611
2105
returned by storage engines that don't support this operation.
613
virtual int reset_auto_increment(uint64_t)
614
{ return HA_ERR_WRONG_COMMAND; }
616
virtual int analyze(Session *)
617
{ return HA_ADMIN_NOT_IMPLEMENTED; }
619
virtual int disable_indexes(uint32_t)
620
{ return HA_ERR_WRONG_COMMAND; }
622
virtual int enable_indexes(uint32_t)
623
{ return HA_ERR_WRONG_COMMAND; }
625
virtual int discard_or_import_tablespace(bool)
626
{ return (errno=HA_ERR_WRONG_COMMAND); }
629
@todo this is just for the HEAP engine, it should
630
be removed at some point in the future (and
631
no new engine should ever use it). Right
632
now HEAP does rely on it, so we cannot remove it.
2107
virtual int reset_auto_increment(uint64_t value __attribute__((__unused__)))
2108
{ return HA_ERR_WRONG_COMMAND; }
2109
virtual int optimize(THD* thd __attribute__((__unused__)),
2110
HA_CHECK_OPT* check_opt __attribute__((__unused__)))
2111
{ return HA_ADMIN_NOT_IMPLEMENTED; }
2112
virtual int analyze(THD* thd __attribute__((__unused__)),
2113
HA_CHECK_OPT* check_opt __attribute__((__unused__)))
2114
{ return HA_ADMIN_NOT_IMPLEMENTED; }
2115
virtual bool check_and_repair(THD *thd __attribute__((__unused__)))
2117
virtual int disable_indexes(uint mode __attribute__((__unused__)))
2118
{ return HA_ERR_WRONG_COMMAND; }
2119
virtual int enable_indexes(uint mode __attribute__((__unused__)))
2120
{ return HA_ERR_WRONG_COMMAND; }
2121
virtual int discard_or_import_tablespace(my_bool discard __attribute__((__unused__)))
2122
{ return (my_errno=HA_ERR_WRONG_COMMAND); }
2123
virtual void prepare_for_alter(void) { return; }
634
2124
virtual void drop_table(const char *name);
2125
virtual int create(const char *name __attribute__((__unused__)),
2126
TABLE *form __attribute__((__unused__)),
2127
HA_CREATE_INFO *info __attribute__((__unused__)))=0;
2129
virtual int create_handler_files(const char *name __attribute__((__unused__)),
2130
const char *old_name __attribute__((__unused__)),
2131
int action_flag __attribute__((__unused__)),
2132
HA_CREATE_INFO *info __attribute__((__unused__)))
2139
A Disk-Sweep MRR interface implementation
2141
This implementation makes range (and, in the future, 'ref') scans to read
2142
table rows in disk sweeps.
2144
Currently it is used by MyISAM and InnoDB. Potentially it can be used with
2145
any table handler that has non-clustered indexes and on-disk rows.
2151
typedef void (handler::*range_check_toggle_func_t)(bool on);
2156
handler *h; /* The "owner" handler object. It is used for scanning the index */
2157
TABLE *table; /* Always equal to h->table */
2160
Secondary handler object. It is used to retrieve full table rows by
2165
/* Buffer to store rowids, or (rowid, range_id) pairs */
2167
uchar *rowids_buf_cur; /* Current position when reading/writing */
2168
uchar *rowids_buf_last; /* When reading: end of used buffer space */
2169
uchar *rowids_buf_end; /* End of the buffer */
2171
bool dsmrr_eof; /* TRUE <=> We have reached EOF when reading index tuples */
2173
/* TRUE <=> need range association, buffer holds {rowid, range_id} pairs */
2176
bool use_default_impl; /* TRUE <=> shortcut all calls to default MRR impl */
2178
void init(handler *h_arg, TABLE *table_arg)
2183
int dsmrr_init(handler *h, KEY *key, RANGE_SEQ_IF *seq_funcs,
2184
void *seq_init_param, uint n_ranges, uint mode,
2185
HANDLER_BUFFER *buf);
2187
int dsmrr_fill_buffer(handler *h);
2188
int dsmrr_next(handler *h, char **range_info);
2190
int dsmrr_info(uint keyno, uint n_ranges, uint keys, uint *bufsz,
2191
uint *flags, COST_VECT *cost);
2193
ha_rows dsmrr_info_const(uint keyno, RANGE_SEQ_IF *seq,
2194
void *seq_init_param, uint n_ranges, uint *bufsz,
2195
uint *flags, COST_VECT *cost);
2197
bool key_uses_partial_cols(uint keyno);
2198
bool choose_mrr_impl(uint keyno, ha_rows rows, uint *flags, uint *bufsz,
2200
bool get_disk_sweep_mrr_cost(uint keynr, ha_rows rows, uint flags,
2201
uint *buffer_size, COST_VECT *cost);
637
2204
extern const char *ha_row_type[];
2205
extern const char *tx_isolation_names[];
2206
extern const char *binlog_format_names[];
2207
extern TYPELIB tx_isolation_typelib;
2208
extern TYPELIB myisam_stats_method_typelib;
2209
extern uint32_t total_ha, total_ha_2pc;
2211
/* Wrapper functions */
2212
#define ha_commit(thd) (ha_commit_trans((thd), TRUE))
2213
#define ha_rollback(thd) (ha_rollback_trans((thd), TRUE))
2216
handlerton *ha_default_handlerton(THD *thd);
2217
plugin_ref ha_resolve_by_name(THD *thd, const LEX_STRING *name);
2218
plugin_ref ha_lock_engine(THD *thd, handlerton *hton);
2219
handlerton *ha_resolve_by_legacy_type(THD *thd, enum legacy_db_type db_type);
2220
handler *get_new_handler(TABLE_SHARE *share, MEM_ROOT *alloc,
2221
handlerton *db_type);
2222
handlerton *ha_checktype(THD *thd, enum legacy_db_type database_type,
2223
bool no_substitute, bool report_error);
2226
static inline enum legacy_db_type ha_legacy_type(const handlerton *db_type)
2228
return (db_type == NULL) ? DB_TYPE_UNKNOWN : db_type->db_type;
2231
static inline const char *ha_resolve_storage_engine_name(const handlerton *db_type)
2233
return db_type == NULL ? "UNKNOWN" : hton2plugin[db_type->slot]->name.str;
2236
static inline bool ha_check_storage_engine_flag(const handlerton *db_type, uint32 flag)
2238
return db_type == NULL ? FALSE : test(db_type->flags & flag);
2241
static inline bool ha_storage_engine_is_enabled(const handlerton *db_type)
2243
return (db_type && db_type->create) ?
2244
(db_type->state == SHOW_OPTION_YES) : FALSE;
639
2247
/* basic stuff */
640
void ha_init_errors(void);
643
SortField *make_unireg_sortorder(Order *order, uint32_t *length,
644
SortField *sortorder);
645
int setup_order(Session *session, Item **ref_pointer_array, TableList *tables,
646
List<Item> &fields, List <Item> &all_fields, Order *order);
647
int setup_group(Session *session, Item **ref_pointer_array, TableList *tables,
648
List<Item> &fields, List<Item> &all_fields, Order *order,
649
bool *hidden_group_fields);
650
bool fix_inner_refs(Session *session, List<Item> &all_fields, Select_Lex *select,
651
Item **ref_pointer_array);
653
bool handle_select(Session *session, LEX *lex, select_result *result,
654
uint64_t setup_tables_done_option);
655
void free_underlaid_joins(Session *session, Select_Lex *select);
657
bool mysql_handle_derived(LEX *lex, bool (*processor)(Session *session,
660
bool mysql_derived_prepare(Session *session, LEX *lex, TableList *t);
661
bool mysql_derived_filling(Session *session, LEX *lex, TableList *t);
662
int prepare_create_field(CreateField *sql_field,
663
uint32_t *blob_columns,
664
int *timestamps, int *timestamps_with_niladic);
666
bool mysql_create_table(Session *session,
667
const TableIdentifier &identifier,
668
HA_CREATE_INFO *create_info,
669
message::Table &table_proto,
670
AlterInfo *alter_info,
671
bool tmp_table, uint32_t select_field_count,
672
bool is_if_not_exists);
674
bool mysql_create_table_no_lock(Session *session,
675
const TableIdentifier &identifier,
676
HA_CREATE_INFO *create_info,
677
message::Table &table_proto,
678
AlterInfo *alter_info,
679
bool tmp_table, uint32_t select_field_count,
680
bool is_if_not_exists);
682
bool mysql_create_like_table(Session* session,
683
const TableIdentifier &destination_identifier,
684
TableList* table, TableList* src_table,
685
message::Table &create_table_proto,
686
bool is_if_not_exists,
689
bool mysql_rename_table(Session &session,
690
plugin::StorageEngine *base,
691
const TableIdentifier &old_identifier,
692
const TableIdentifier &new_identifier);
694
bool mysql_prepare_update(Session *session, TableList *table_list,
695
Item **conds, uint32_t order_num, Order *order);
696
int mysql_update(Session *session,TableList *tables,List<Item> &fields,
697
List<Item> &values,COND *conds,
698
uint32_t order_num, Order *order, ha_rows limit,
699
enum enum_duplicates handle_duplicates, bool ignore);
700
bool mysql_prepare_insert(Session *session, TableList *table_list, Table *table,
701
List<Item> &fields, List_item *values,
702
List<Item> &update_fields,
703
List<Item> &update_values, enum_duplicates duplic,
704
COND **where, bool select_insert,
705
bool check_fields, bool abort_on_warning);
706
bool mysql_insert(Session *session,TableList *table,List<Item> &fields,
707
List<List_item> &values, List<Item> &update_fields,
708
List<Item> &update_values, enum_duplicates flag,
710
int check_that_all_fields_are_given_values(Session *session, Table *entry,
711
TableList *table_list);
712
int mysql_prepare_delete(Session *session, TableList *table_list, Item **conds);
713
bool mysql_delete(Session *session, TableList *table_list, COND *conds,
714
SQL_LIST *order, ha_rows rows, uint64_t options,
715
bool reset_auto_increment);
716
bool mysql_truncate(Session& session, TableList *table_list);
717
TableShare *get_table_share(Session *session, TableList *table_list, char *key,
718
uint32_t key_length, uint32_t db_flags, int *error);
719
TableShare *get_cached_table_share(const char *db, const char *table_name);
720
bool reopen_name_locked_table(Session* session, TableList* table_list, bool link_in);
721
bool reopen_tables(Session *session,bool get_locks,bool in_refresh);
722
void close_handle_and_leave_table_as_lock(Table *table);
723
bool wait_for_tables(Session *session);
724
bool table_is_used(Table *table, bool wait_for_name_lock);
725
Table *drop_locked_tables(Session *session, const drizzled::TableIdentifier &identifier);
726
void abort_locked_tables(Session *session, const drizzled::TableIdentifier &identifier);
727
extern Field *not_found_field;
728
extern Field *view_ref_found;
731
find_field_in_tables(Session *session, Item_ident *item,
732
TableList *first_table, TableList *last_table,
733
Item **ref, find_item_error_report_type report_error,
734
bool register_tree_change);
736
find_field_in_table_ref(Session *session, TableList *table_list,
737
const char *name, uint32_t length,
738
const char *item_name, const char *db_name,
739
const char *table_name, Item **ref,
741
uint32_t *cached_field_index_ptr,
742
bool register_tree_change, TableList **actual_table);
744
find_field_in_table(Session *session, Table *table, const char *name, uint32_t length,
745
bool allow_rowid, uint32_t *cached_field_index_ptr);
747
} /* namespace drizzled */
749
#endif /* DRIZZLED_CURSOR_H */
2248
int ha_init_errors(void);
2251
int ha_initialize_handlerton(st_plugin_int *plugin);
2252
int ha_finalize_handlerton(st_plugin_int *plugin);
2254
TYPELIB *ha_known_exts(void);
2255
int ha_panic(enum ha_panic_function flag);
2256
void ha_close_connection(THD* thd);
2257
bool ha_flush_logs(handlerton *db_type);
2258
void ha_drop_database(char* path);
2259
int ha_create_table(THD *thd, const char *path,
2260
const char *db, const char *table_name,
2261
HA_CREATE_INFO *create_info,
2262
bool update_create_info);
2263
int ha_delete_table(THD *thd, handlerton *db_type, const char *path,
2264
const char *db, const char *alias, bool generate_warning);
2266
/* statistics and info */
2267
bool ha_show_status(THD *thd, handlerton *db_type, enum ha_stat_type stat);
2270
int ha_create_table_from_engine(THD* thd, const char *db, const char *name);
2271
int ha_discover(THD* thd, const char* dbname, const char* name,
2272
uchar** frmblob, size_t* frmlen);
2273
int ha_find_files(THD *thd,const char *db,const char *path,
2274
const char *wild, bool dir, List<LEX_STRING>* files);
2275
int ha_table_exists_in_engine(THD* thd, const char* db, const char* name);
2278
extern "C" int ha_init_key_cache(const char *name, KEY_CACHE *key_cache);
2279
int ha_resize_key_cache(KEY_CACHE *key_cache);
2280
int ha_change_key_cache_param(KEY_CACHE *key_cache);
2281
int ha_change_key_cache(KEY_CACHE *old_key_cache, KEY_CACHE *new_key_cache);
2282
int ha_end_key_cache(KEY_CACHE *key_cache);
2284
/* report to InnoDB that control passes to the client */
2285
int ha_release_temporary_latches(THD *thd);
2287
/* transactions: interface to handlerton functions */
2288
int ha_start_consistent_snapshot(THD *thd);
2289
int ha_commit_or_rollback_by_xid(XID *xid, bool commit);
2290
int ha_commit_one_phase(THD *thd, bool all);
2291
int ha_rollback_trans(THD *thd, bool all);
2292
int ha_prepare(THD *thd);
2293
int ha_recover(HASH *commit_list);
2295
/* transactions: these functions never call handlerton functions directly */
2296
int ha_commit_trans(THD *thd, bool all);
2297
int ha_autocommit_or_rollback(THD *thd, int error);
2298
int ha_enable_transaction(THD *thd, bool on);
2301
int ha_rollback_to_savepoint(THD *thd, SAVEPOINT *sv);
2302
int ha_savepoint(THD *thd, SAVEPOINT *sv);
2303
int ha_release_savepoint(THD *thd, SAVEPOINT *sv);
2305
/* these are called by storage engines */
2306
void trans_register_ha(THD *thd, bool all, handlerton *ht);
2309
Storage engine has to assume the transaction will end up with 2pc if
2310
- there is more than one 2pc-capable storage engine available
2311
- in the current transaction 2pc was not disabled yet
2313
#define trans_need_2pc(thd, all) ((total_ha_2pc > 1) && \
2314
!((all ? &thd->transaction.all : &thd->transaction.stmt)->no_2pc))
2316
#ifdef HAVE_NDB_BINLOG
2317
int ha_reset_logs(THD *thd);
2318
int ha_binlog_index_purge_file(THD *thd, const char *file);
2319
void ha_reset_slave(THD *thd);
2320
void ha_binlog_log_query(THD *thd, handlerton *db_type,
2321
enum_binlog_command binlog_command,
2322
const char *query, uint query_length,
2323
const char *db, const char *table_name);
2324
void ha_binlog_wait(THD *thd);
2325
int ha_binlog_end(THD *thd);
2327
#define ha_reset_logs(a) do {} while (0)
2328
#define ha_binlog_index_purge_file(a,b) do {} while (0)
2329
#define ha_reset_slave(a) do {} while (0)
2330
#define ha_binlog_log_query(a,b,c,d,e,f,g) do {} while (0)
2331
#define ha_binlog_wait(a) do {} while (0)
2332
#define ha_binlog_end(a) do {} while (0)