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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, Inc.
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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 <mysys/my_handler.h>
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#include <storage/myisam/keycache.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 <drizzled/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/atomics.h>
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#include <drizzled/definitions.h>
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#include <drizzled/discrete_interval.h>
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#include <drizzled/error_t.h>
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#include <drizzled/ha_statistics.h>
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#include <drizzled/handler_structs.h>
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#include <drizzled/identifier.h>
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#include <drizzled/key_map.h>
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#include <drizzled/message/table.h>
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#include <drizzled/sql_list.h>
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#include <drizzled/thr_lock.h>
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#include <drizzled/xid.h>
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#include <drizzled/visibility.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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#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;
498
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
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int (*close_connection)(handlerton *hton, THD *thd);
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sv points to an uninitialized storage area of requested size
528
(see savepoint_offset description)
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int (*savepoint_set)(handlerton *hton, THD *thd, void *sv);
532
sv points to a storage area, that was earlier passed
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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'
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and 'real commit' mean the same event.
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int (*commit)(handlerton *hton, THD *thd, bool all);
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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);
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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);
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void (*set_cursor_read_view)(handlerton *hton, THD *thd, void *read_view);
552
void (*close_cursor_read_view)(handlerton *hton, THD *thd, void *read_view);
553
handler *(*create)(handlerton *hton, TABLE_SHARE *table, MEM_ROOT *mem_root);
554
void (*drop_database)(handlerton *hton, char* path);
555
int (*start_consistent_snapshot)(handlerton *hton, THD *thd);
556
bool (*flush_logs)(handlerton *hton);
557
bool (*show_status)(handlerton *hton, THD *thd, stat_print_fn *print, enum ha_stat_type stat);
558
int (*fill_files_table)(handlerton *hton, THD *thd,
561
uint32_t flags; /* global handler flags */
562
int (*release_temporary_latches)(handlerton *hton, THD *thd);
564
int (*discover)(handlerton *hton, THD* thd, const char *db,
568
int (*table_exists_in_engine)(handlerton *hton, THD* thd, const char *db,
570
uint32_t license; /* Flag for Engine License */
571
void *data; /* Location for engines to keep personal structures */
575
/* Possible flags of a handlerton (there can be 32 of them) */
576
#define HTON_NO_FLAGS 0
577
#define HTON_CLOSE_CURSORS_AT_COMMIT (1 << 0)
578
#define HTON_ALTER_NOT_SUPPORTED (1 << 1) //Engine does not support alter
579
#define HTON_CAN_RECREATE (1 << 2) //Delete all is used fro truncate
580
#define HTON_HIDDEN (1 << 3) //Engine does not appear in lists
581
#define HTON_FLUSH_AFTER_RENAME (1 << 4)
582
#define HTON_NOT_USER_SELECTABLE (1 << 5)
583
#define HTON_TEMPORARY_NOT_SUPPORTED (1 << 6) //Having temporary tables not supported
584
#define HTON_SUPPORT_LOG_TABLES (1 << 7) //Engine supports log tables
585
#define HTON_NO_PARTITION (1 << 8) //You can not partition these tables
591
/* true is not all entries in the ht[] support 2pc */
593
/* storage engines that registered in this transaction */
594
Ha_trx_info *ha_list;
596
The purpose of this flag is to keep track of non-transactional
597
tables that were modified in scope of:
598
- transaction, when the variable is a member of
600
- top-level statement or sub-statement, when the variable is a
601
member of THD::transaction.stmt
602
This member has the following life cycle:
603
* stmt.modified_non_trans_table is used to keep track of
604
modified non-transactional tables of top-level statements. At
605
the end of the previous statement and at the beginning of the session,
606
it is reset to false. If such functions
607
as mysql_insert, mysql_update, mysql_delete etc modify a
608
non-transactional table, they set this flag to true. At the
609
end of the statement, the value of stmt.modified_non_trans_table
610
is merged with all.modified_non_trans_table and gets reset.
611
* all.modified_non_trans_table is reset at the end of transaction
613
* Since we do not have a dedicated context for execution of a
614
sub-statement, to keep track of non-transactional changes in a
615
sub-statement, we re-use stmt.modified_non_trans_table.
616
At entrance into a sub-statement, a copy of the value of
617
stmt.modified_non_trans_table (containing the changes of the
618
outer statement) is saved on stack. Then
619
stmt.modified_non_trans_table is reset to false and the
620
substatement is executed. Then the new value is merged with the
623
bool modified_non_trans_table;
625
void reset() { no_2pc= false; modified_non_trans_table= false; }
630
Either statement transaction or normal transaction - related
631
thread-specific storage engine data.
633
If a storage engine participates in a statement/transaction,
634
an instance of this class is present in
635
thd->transaction.{stmt|all}.ha_list. The addition to
636
{stmt|all}.ha_list is made by trans_register_ha().
638
When it's time to commit or rollback, each element of ha_list
639
is used to access storage engine's prepare()/commit()/rollback()
640
methods, and also to evaluate if a full two phase commit is
643
@sa General description of transaction handling in handler.cc.
649
/** Register this storage engine in the given transaction context. */
650
void register_ha(THD_TRANS *trans, handlerton *ht_arg)
652
assert(m_flags == 0);
653
assert(m_ht == NULL);
654
assert(m_next == NULL);
657
m_flags= (int) TRX_READ_ONLY; /* Assume read-only at start. */
659
m_next= trans->ha_list;
660
trans->ha_list= this;
663
/** Clear, prepare for reuse. */
671
Ha_trx_info() { reset(); }
673
void set_trx_read_write()
675
assert(is_started());
676
m_flags|= (int) TRX_READ_WRITE;
678
bool is_trx_read_write() const
680
assert(is_started());
681
return m_flags & (int) TRX_READ_WRITE;
683
bool is_started() const { return m_ht != NULL; }
684
/** Mark this transaction read-write if the argument is read-write. */
685
void coalesce_trx_with(const Ha_trx_info *stmt_trx)
688
Must be called only after the transaction has been started.
689
Can be called many times, e.g. when we have many
690
read-write statements in a transaction.
692
assert(is_started());
693
if (stmt_trx->is_trx_read_write())
694
set_trx_read_write();
696
Ha_trx_info *next() const
698
assert(is_started());
701
handlerton *ht() const
703
assert(is_started());
707
enum { TRX_READ_ONLY= 0, TRX_READ_WRITE= 1 };
708
/** Auxiliary, used for ha_list management */
711
Although a given Ha_trx_info instance is currently always used
712
for the same storage engine, 'ht' is not-NULL only when the
713
corresponding storage is a part of a transaction.
717
Transaction flags related to this engine.
718
Not-null only if this instance is a part of transaction.
719
May assume a combination of enum values above.
725
enum enum_tx_isolation { ISO_READ_UNCOMMITTED, ISO_READ_COMMITTED,
726
ISO_REPEATABLE_READ, ISO_SERIALIZABLE};
729
uint64_t data_file_length;
730
uint64_t max_data_file_length;
731
uint64_t index_file_length;
732
uint64_t delete_length;
734
uint32_t mean_rec_length;
741
#define UNDEF_NODEGROUP 65535
55
class Select_Lex_Unit;
64
typedef List<Item> List_item;
743
struct st_table_log_memory_entry;
745
#define NOT_A_PARTITION_ID ((uint32_t)-1)
747
enum ha_choice { HA_CHOICE_UNDEF, HA_CHOICE_NO, HA_CHOICE_YES };
749
typedef struct st_ha_create_information
751
CHARSET_INFO *table_charset, *default_table_charset;
752
LEX_STRING connect_string;
754
const char *data_file_name, *index_file_name;
756
uint64_t max_rows,min_rows;
757
uint64_t auto_increment_value;
758
uint32_t table_options;
759
uint32_t avg_row_length;
760
uint32_t used_fields;
761
uint32_t key_block_size;
764
enum row_type row_type;
765
uint null_bits; /* NULL bits at start of record */
766
uint options; /* OR of HA_CREATE_ options */
767
uint merge_insert_method;
768
uint extra_size; /* length of extra data segment */
769
/* 0 not used, 1 if not transactional, 2 if transactional */
770
enum ha_choice transactional;
771
bool table_existed; /* 1 in create if table existed */
772
bool frm_only; /* 1 if no ha_create_table() */
773
bool varchar; /* 1 if table has a VARCHAR */
774
enum ha_choice page_checksum; /* If we have page_checksums */
777
typedef struct st_ha_alter_information
779
KEY *key_info_buffer;
781
uint index_drop_count;
782
uint *index_drop_buffer;
783
uint index_add_count;
784
uint *index_add_buffer;
789
typedef struct st_key_create_information
791
enum ha_key_alg algorithm;
793
LEX_STRING parser_name;
799
Class for maintaining hooks used inside operations on tables such
800
as: create table functions, delete table functions, and alter table
803
Class is using the Template Method pattern to separate the public
804
usage interface from the private inheritance interface. This
805
imposes no overhead, since the public non-virtual function is small
806
enough to be inlined.
808
The hooks are usually used for functions that does several things,
809
e.g., create_table_from_items(), which both create a table and lock
816
virtual ~TABLEOP_HOOKS() {}
818
inline void prelock(TABLE **tables, uint count)
820
do_prelock(tables, count);
823
inline int postlock(TABLE **tables, uint count)
825
return do_postlock(tables, count);
828
/* Function primitive that is called prior to locking tables */
829
virtual void do_prelock(TABLE **tables __attribute__((unused)),
830
uint count __attribute__((unused)))
832
/* Default is to do nothing */
836
Primitive called after tables are locked.
838
If an error is returned, the tables will be unlocked and error
841
@return Error code or zero.
843
virtual int do_postlock(TABLE **tables __attribute__((unused)),
844
uint count __attribute__((unused)))
846
return 0; /* Default is to do nothing */
850
typedef struct st_savepoint SAVEPOINT;
851
extern uint32_t savepoint_alloc_size;
65
852
extern KEY_CREATE_INFO default_key_create_info;
67
854
/* Forward declaration for condition pushdown to storage engine */
68
855
typedef class Item COND;
70
typedef struct system_status_var system_status_var;
72
namespace optimizer { class CostVector; }
73
namespace plugin { class StorageEngine; }
857
typedef struct st_ha_check_opt
859
st_ha_check_opt() {} /* Remove gcc warning */
860
uint32_t sort_buffer_size;
861
uint flags; /* isam layer flags (e.g. for myisamchk) */
862
uint sql_flags; /* sql layer flags - for something myisamchk cannot do */
863
KEY_CACHE *key_cache; /* new key cache when changing key cache */
870
This is a buffer area that the handler can use to store rows.
871
'end_of_used_area' should be kept updated after calls to
872
read-functions so that other parts of the code can use the
873
remaining area (until next read calls is issued).
876
typedef struct st_handler_buffer
878
uchar *buffer; /* Buffer one can start using */
879
uchar *buffer_end; /* End of buffer */
880
uchar *end_of_used_area; /* End of area that was used by handler */
883
typedef struct system_status_var SSV;
886
typedef void *range_seq_t;
888
typedef struct st_range_seq_if
891
Initialize the traversal of range sequence
895
init_params The seq_init_param parameter
896
n_ranges The number of ranges obtained
897
flags A combination of HA_MRR_SINGLE_POINT, HA_MRR_FIXED_KEY
900
An opaque value to be used as RANGE_SEQ_IF::next() parameter
902
range_seq_t (*init)(void *init_params, uint n_ranges, uint flags);
906
Get the next range in the range sequence
910
seq The value returned by RANGE_SEQ_IF::init()
911
range OUT Information about the next range
914
0 - Ok, the range structure filled with info about the next range
917
uint (*next) (range_seq_t seq, KEY_MULTI_RANGE *range);
920
uint16_t &mrr_persistent_flag_storage(range_seq_t seq, uint idx);
921
char* &mrr_get_ptr_by_idx(range_seq_t seq, uint idx);
926
double io_count; /* number of I/O */
927
double avg_io_cost; /* cost of an average I/O oper. */
928
double cpu_cost; /* cost of operations in CPU */
929
double mem_cost; /* cost of used memory */
930
double import_cost; /* cost of remote operations */
933
enum { CPU_COEFF=1 };
934
enum { MEM_COEFF=1 };
935
enum { IMPORT_COEFF=1 };
937
COST_VECT() {} // keep gcc happy
941
return IO_COEFF*io_count*avg_io_cost + CPU_COEFF * cpu_cost +
942
MEM_COEFF*mem_cost + IMPORT_COEFF*import_cost;
948
io_count= cpu_cost= mem_cost= import_cost= 0.0;
951
void multiply(double m)
956
/* Don't multiply mem_cost */
959
void add(const COST_VECT* cost)
961
double io_count_sum= io_count + cost->io_count;
962
add_io(cost->io_count, cost->avg_io_cost);
963
io_count= io_count_sum;
964
cpu_cost += cost->cpu_cost;
966
void add_io(double add_io_cnt, double add_avg_cost)
968
double io_count_sum= io_count + add_io_cnt;
969
avg_io_cost= (io_count * avg_io_cost +
970
add_io_cnt * add_avg_cost) / io_count_sum;
971
io_count= io_count_sum;
975
void get_sweep_read_cost(TABLE *table, ha_rows nrows, bool interrupted,
979
The below two are not used (and not handled) in this milestone of this WL
980
entry because there seems to be no use for them at this stage of
983
#define HA_MRR_SINGLE_POINT 1
984
#define HA_MRR_FIXED_KEY 2
987
Indicates that RANGE_SEQ_IF::next(&range) doesn't need to fill in the
990
#define HA_MRR_NO_ASSOCIATION 4
993
The MRR user will provide ranges in key order, and MRR implementation
994
must return rows in key order.
996
#define HA_MRR_SORTED 8
998
/* MRR implementation doesn't have to retrieve full records */
999
#define HA_MRR_INDEX_ONLY 16
1002
The passed memory buffer is of maximum possible size, the caller can't
1003
assume larger buffer.
1005
#define HA_MRR_LIMITS 32
1009
Flag set <=> default MRR implementation is used
1010
(The choice is made by **_info[_const]() function which may set this
1011
flag. SQL layer remembers the flag value and then passes it to
1012
multi_read_range_init().
1014
#define HA_MRR_USE_DEFAULT_IMPL 64
1017
Used only as parameter to multi_range_read_info():
1018
Flag set <=> the caller guarantees that the bounds of the scanned ranges
1019
will not have NULL values.
1021
#define HA_MRR_NO_NULL_ENDPOINTS 128
1027
uint64_t data_file_length; /* Length off data file */
1028
uint64_t max_data_file_length; /* Length off data file */
1029
uint64_t index_file_length;
1030
uint64_t max_index_file_length;
1031
uint64_t delete_length; /* Free bytes */
1032
uint64_t auto_increment_value;
1034
The number of records in the table.
1035
0 - means the table has exactly 0 rows
1036
other - if (table_flags() & HA_STATS_RECORDS_IS_EXACT)
1037
the value is the exact number of records in the table
1042
ha_rows deleted; /* Deleted records */
1043
uint32_t mean_rec_length; /* physical reclength */
1044
time_t create_time; /* When table was created */
1047
uint block_size; /* index block size */
1050
data_file_length(0), max_data_file_length(0),
1051
index_file_length(0), delete_length(0), auto_increment_value(0),
1052
records(0), deleted(0), mean_rec_length(0), create_time(0),
1053
check_time(0), update_time(0), block_size(0)
1057
uint calculate_key_len(TABLE *, uint, const uchar *, key_part_map);
76
1059
bitmap with first N+1 bits set
77
1060
(keypart_map for a key prefix of [0..N] keyparts)
80
inline key_part_map make_keypart_map(T a)
82
return (((key_part_map)2 << a) - 1);
1062
#define make_keypart_map(N) (((key_part_map)2 << (N)) - 1)
86
1064
bitmap with first N bits set
87
1065
(keypart_map for a key prefix of [0..N-1] keyparts)
90
inline key_part_map make_prev_keypart_map(T a)
92
return (((key_part_map)1 << a) - 1);
1067
#define make_prev_keypart_map(N) (((key_part_map)1 << (N)) - 1)
96
The Cursor class is the interface for dynamically loadable
1070
The handler class is the interface for dynamically loadable
97
1071
storage engines. Do not add ifdefs and take care when adding or
98
1072
changing virtual functions to avoid vtable confusion
226
1191
Discrete_interval auto_inc_interval_for_cur_row;
228
Cursor(plugin::StorageEngine &engine_arg, Table &share_arg);
229
virtual ~Cursor(void);
230
virtual Cursor *clone(memory::Root *mem_root);
1193
handler(handlerton *ht_arg, TABLE_SHARE *share_arg)
1194
:table_share(share_arg), table(0),
1195
estimation_rows_to_insert(0), ht(ht_arg),
1196
ref(0), in_range_check_pushed_down(false),
1197
key_used_on_scan(MAX_KEY), active_index(MAX_KEY),
1198
ref_length(sizeof(my_off_t)),
1200
locked(false), implicit_emptied(0),
1201
pushed_cond(0), pushed_idx_cond(NULL), pushed_idx_cond_keyno(MAX_KEY),
1202
next_insert_id(0), insert_id_for_cur_row(0)
1204
virtual ~handler(void)
1206
assert(locked == false);
1207
/* TODO: assert(inited == NONE); */
1209
virtual handler *clone(MEM_ROOT *mem_root);
1210
/** This is called after create to allow us to set up cached variables */
1213
cached_table_flags= table_flags();
232
1215
/* ha_ methods: pubilc wrappers for private virtual API */
234
int ha_open(const identifier::Table &identifier, int mode, int test_if_locked);
235
int startIndexScan(uint32_t idx, bool sorted) __attribute__ ((warn_unused_result));
237
int startTableScan(bool scan) __attribute__ ((warn_unused_result));
1217
int ha_open(TABLE *table, const char *name, int mode, int test_if_locked);
1218
int ha_index_init(uint idx, bool sorted)
1221
assert(inited==NONE);
1222
if (!(result= index_init(idx, sorted)))
1229
assert(inited==INDEX);
1232
return(index_end());
1234
int ha_rnd_init(bool scan)
1237
assert(inited==NONE || (inited==RND && scan));
1238
inited= (result= rnd_init(scan)) ? NONE: RND;
1243
assert(inited==RND);
241
1248
/* this is necessary in many places, e.g. in HANDLER command */
242
int ha_index_or_rnd_end();
1249
int ha_index_or_rnd_end()
1251
return inited == INDEX ? ha_index_end() : inited == RND ? ha_rnd_end() : 0;
1253
Table_flags ha_table_flags() const { return cached_table_flags; }
245
1255
These functions represent the public interface to *users* of the
246
Cursor class, hence they are *not* virtual. For the inheritance
247
interface, see the (private) functions doInsertRecord(), doUpdateRecord(),
248
and doDeleteRecord() below.
1256
handler class, hence they are *not* virtual. For the inheritance
1257
interface, see the (private) functions write_row(), update_row(),
1258
and delete_row() below.
250
int ha_external_lock(Session *session, int lock_type);
251
int insertRecord(unsigned char * buf) __attribute__ ((warn_unused_result));
252
int updateRecord(const unsigned char * old_data, unsigned char * new_data) __attribute__ ((warn_unused_result));
253
int deleteRecord(const unsigned char * buf) __attribute__ ((warn_unused_result));
1260
int ha_external_lock(THD *thd, int lock_type);
1261
int ha_write_row(uchar * buf);
1262
int ha_update_row(const uchar * old_data, uchar * new_data);
1263
int ha_delete_row(const uchar * buf);
254
1264
void ha_release_auto_increment();
1266
int ha_check_for_upgrade(HA_CHECK_OPT *check_opt);
256
1267
/** to be actually called to get 'check()' functionality*/
257
int ha_check(Session *session, HA_CHECK_OPT *check_opt);
259
void ha_start_bulk_insert(ha_rows rows);
260
int ha_end_bulk_insert();
1268
int ha_check(THD *thd, HA_CHECK_OPT *check_opt);
1269
int ha_repair(THD* thd, HA_CHECK_OPT* check_opt);
1270
void ha_start_bulk_insert(ha_rows rows)
1272
estimation_rows_to_insert= rows;
1273
start_bulk_insert(rows);
1275
int ha_end_bulk_insert()
1277
estimation_rows_to_insert= 0;
1278
return end_bulk_insert();
1280
int ha_bulk_update_row(const uchar *old_data, uchar *new_data,
1281
uint *dup_key_found);
261
1282
int ha_delete_all_rows();
262
1283
int ha_reset_auto_increment(uint64_t value);
263
int ha_analyze(Session* session, HA_CHECK_OPT* check_opt);
265
int ha_disable_indexes(uint32_t mode);
266
int ha_enable_indexes(uint32_t mode);
1284
int ha_optimize(THD* thd, HA_CHECK_OPT* check_opt);
1285
int ha_analyze(THD* thd, HA_CHECK_OPT* check_opt);
1286
bool ha_check_and_repair(THD *thd);
1287
int ha_disable_indexes(uint mode);
1288
int ha_enable_indexes(uint mode);
267
1289
int ha_discard_or_import_tablespace(bool discard);
268
void closeMarkForDelete(const char *name);
1290
void ha_prepare_for_alter();
1291
int ha_rename_table(const char *from, const char *to);
1292
int ha_delete_table(const char *name);
1293
void ha_drop_table(const char *name);
1295
int ha_create(const char *name, TABLE *form, HA_CREATE_INFO *info);
1297
int ha_create_handler_files(const char *name, const char *old_name,
1298
int action_flag, HA_CREATE_INFO *info);
270
1300
void adjust_next_insert_id_after_explicit_value(uint64_t nr);
271
1301
int update_auto_increment();
1302
void print_keydup_error(uint key_nr, const char *msg);
1303
virtual void print_error(int error, myf errflag);
1304
virtual bool get_error_message(int error, String *buf);
1305
uint get_dup_key(int error);
1306
virtual void change_table_ptr(TABLE *table_arg, TABLE_SHARE *share)
273
1311
/* Estimates calculation */
274
1312
virtual double scan_time(void)
275
{ return static_cast<double>(stats.data_file_length) / IO_SIZE + 2; }
276
virtual double read_time(uint32_t, uint32_t ranges, ha_rows rows)
277
{ return ranges + rows; }
279
virtual double index_only_read_time(uint32_t keynr, double records);
281
virtual ha_rows multi_range_read_info_const(uint32_t keyno, RANGE_SEQ_IF *seq,
282
void *seq_init_param,
283
uint32_t n_ranges, uint32_t *bufsz,
284
uint32_t *flags, optimizer::CostVector *cost);
285
virtual int multi_range_read_info(uint32_t keyno, uint32_t n_ranges, uint32_t keys,
286
uint32_t *bufsz, uint32_t *flags, optimizer::CostVector *cost);
1313
{ return uint64_t2double(stats.data_file_length) / IO_SIZE + 2; }
1314
virtual double read_time(uint index __attribute__((unused)),
1315
uint ranges, ha_rows rows)
1316
{ return rows2double(ranges+rows); }
1318
virtual double index_only_read_time(uint keynr, double records);
1320
virtual ha_rows multi_range_read_info_const(uint keyno, RANGE_SEQ_IF *seq,
1321
void *seq_init_param,
1322
uint n_ranges, uint *bufsz,
1323
uint *flags, COST_VECT *cost);
1324
virtual int multi_range_read_info(uint keyno, uint n_ranges, uint keys,
1325
uint *bufsz, uint *flags, COST_VECT *cost);
287
1326
virtual int multi_range_read_init(RANGE_SEQ_IF *seq, void *seq_init_param,
288
uint32_t n_ranges, uint32_t mode);
1327
uint n_ranges, uint mode,
1328
HANDLER_BUFFER *buf);
289
1329
virtual int multi_range_read_next(char **range_info);
292
virtual const key_map *keys_to_use_for_scanning();
293
bool has_transactions();
1332
virtual const key_map *keys_to_use_for_scanning() { return &key_map_empty; }
1333
bool has_transactions()
1334
{ return (ha_table_flags() & HA_NO_TRANSACTIONS) == 0; }
1335
virtual uint extra_rec_buf_length() const { return 0; }
296
1338
This method is used to analyse the error to see whether the error
297
1339
is ignorable or not, certain handlers can have more error that are
298
ignorable than others. E.g. the partition Cursor can get inserts
1340
ignorable than others. E.g. the partition handler can get inserts
299
1341
into a range where there is no partition and this is an ignorable
301
1343
HA_ERR_FOUND_DUP_UNIQUE is a special case in MyISAM that means the
302
1344
same thing as HA_ERR_FOUND_DUP_KEY but can in some cases lead to
303
1345
a slightly different error message.
305
virtual bool is_fatal_error(int error, uint32_t flags);
1347
virtual bool is_fatal_error(int error, uint flags)
1350
((flags & HA_CHECK_DUP_KEY) &&
1351
(error == HA_ERR_FOUND_DUPP_KEY ||
1352
error == HA_ERR_FOUND_DUPP_UNIQUE)))
308
1358
Number of rows in table. It will only be called if
309
1359
(table_flags() & (HA_HAS_RECORDS | HA_STATS_RECORDS_IS_EXACT)) != 0
311
virtual ha_rows records();
312
virtual uint64_t tableSize();
313
virtual uint64_t rowSize();
1361
virtual ha_rows records() { return stats.records; }
315
1363
Return upper bound of current number of records in the table
316
1364
(max. of how many records one will retrieve when doing a full table scan)
478
1680
@note that one can NOT rely on table->in_use in store_lock(). It may
479
refer to a different thread if called from abortLockForThread().
1681
refer to a different thread if called from mysql_lock_abort_for_thread().
481
1683
@note If the table is MERGE, store_lock() can return less locks
482
1684
than lock_count() claimed. This can happen when the MERGE children
483
1685
are not attached when this is called from another thread.
485
virtual THR_LOCK_DATA **store_lock(Session *,
1687
virtual THR_LOCK_DATA **store_lock(THD *thd,
486
1688
THR_LOCK_DATA **to,
1689
enum thr_lock_type lock_type)=0;
1691
/** Type of table for caching query */
1692
virtual uint8_t table_cache_type() { return HA_CACHE_TBL_NONTRANSACT; }
1696
@brief Register a named table with a call back function to the query cache.
1698
@param thd The thread handle
1699
@param table_key A pointer to the table name in the table cache
1700
@param key_length The length of the table name
1701
@param[out] engine_callback The pointer to the storage engine call back
1703
@param[out] engine_data Storage engine specific data which could be
1706
This method offers the storage engine, the possibility to store a reference
1707
to a table name which is going to be used with query cache.
1708
The method is called each time a statement is written to the cache and can
1709
be used to verify if a specific statement is cachable. It also offers
1710
the possibility to register a generic (but static) call back function which
1711
is called each time a statement is matched against the query cache.
1713
@note If engine_data supplied with this function is different from
1714
engine_data supplied with the callback function, and the callback returns
1715
false, a table invalidation on the current table will occur.
1717
@return Upon success the engine_callback will point to the storage engine
1718
call back function, if any, and engine_data will point to any storage
1719
engine data used in the specific implementation.
1720
@retval true Success
1721
@retval false The specified table or current statement should not be
1726
register_query_cache_table(THD *thd __attribute__((unused)),
1727
char *table_key __attribute__((unused)),
1728
uint key_length __attribute__((unused)),
1729
qc_engine_callback *engine_callback,
1730
uint64_t *engine_data __attribute__((unused)))
489
assert(0); // Impossible programming situation
1732
*engine_callback= 0;
495
1738
@retval true Primary key (if there is one) is clustered
496
1739
key covering all fields
497
1740
@retval false otherwise
499
1742
virtual bool primary_key_is_clustered() { return false; }
500
virtual int cmp_ref(const unsigned char *ref1, const unsigned char *ref2)
1743
virtual int cmp_ref(const uchar *ref1, const uchar *ref2)
502
1745
return memcmp(ref1, ref2, ref_length);
505
virtual bool isOrdered(void)
1749
Condition pushdown to storage engines
1753
Push condition down to the table handler.
1755
@param cond Condition to be pushed. The condition tree must not be
1756
modified by the by the caller.
1759
The 'remainder' condition that caller must use to filter out records.
1760
NULL means the handler will not return rows that do not match the
1764
The pushed conditions form a stack (from which one can remove the
1765
last pushed condition using cond_pop).
1766
The table handler filters out rows using (pushed_cond1 AND pushed_cond2
1767
AND ... AND pushed_condN)
1768
or less restrictive condition, depending on handler's capabilities.
1770
handler->ha_reset() call empties the condition stack.
1771
Calls to rnd_init/rnd_end, index_init/index_end etc do not affect the
1774
virtual const COND *cond_push(const COND *cond) { return cond; }
1777
Pop the top condition from the condition stack of the handler instance.
1779
Pops the top if condition stack, if stack is not empty.
1781
virtual void cond_pop(void) { return; }
1784
*idx_cond_push(uint keyno __attribute__((unused)),
1785
Item* idx_cond __attribute__((unused)))
1786
{ return idx_cond; }
1789
Part of old fast alter table, to be depricated
1792
check_if_incompatible_data(HA_CREATE_INFO *create_info __attribute__((unused)),
1793
uint table_changes __attribute__((unused)))
1794
{ return COMPATIBLE_DATA_NO; }
1796
/* On-line ALTER TABLE interface */
1799
Check if a storage engine supports a particular alter table on-line
1801
@param altered_table A temporary table show what table is to
1803
@param create_info Information from the parsing phase about new
1805
@param alter_flags Bitmask that shows what will be changed
1806
@param table_changes Shows if table layout has changed (for
1807
backwards compatibility with
1808
check_if_incompatible_data
1810
@retval HA_ALTER_ERROR Unexpected error
1811
@retval HA_ALTER_SUPPORTED_WAIT_LOCK Supported, but requires DDL lock
1812
@retval HA_ALTER_SUPPORTED_NO_LOCK Supported
1813
@retval HA_ALTER_NOT_SUPPORTED Not supported
1816
The default implementation is implemented to support fast
1817
alter table (storage engines that support some changes by
1818
just changing the frm file) without any change in the handler
1822
check_if_supported_alter(TABLE *altered_table __attribute__((unused)),
1823
HA_CREATE_INFO *create_info,
1824
HA_ALTER_FLAGS *alter_flags __attribute__((unused)),
1827
if (this->check_if_incompatible_data(create_info, table_changes)
1828
== COMPATIBLE_DATA_NO)
1829
return(HA_ALTER_NOT_SUPPORTED);
1831
return(HA_ALTER_SUPPORTED_WAIT_LOCK);
1834
Tell storage engine to prepare for the on-line alter table (pre-alter)
1836
@param thd The thread handle
1837
@param altered_table A temporary table show what table is to
1839
@param alter_info Storage place for data used during phase1
1841
@param alter_flags Bitmask that shows what will be changed
1844
@retval error error code passed from storage engine
1846
virtual int alter_table_phase1(THD *thd __attribute__((unused)),
1847
TABLE *altered_table __attribute__((unused)),
1848
HA_CREATE_INFO *create_info __attribute__((unused)),
1849
HA_ALTER_INFO *alter_info __attribute__((unused)),
1850
HA_ALTER_FLAGS *alter_flags __attribute__((unused)))
1852
return HA_ERR_UNSUPPORTED;
1855
Tell storage engine to perform the on-line alter table (alter)
1857
@param thd The thread handle
1858
@param altered_table A temporary table show what table is to
1860
@param alter_info Storage place for data used during phase1
1862
@param alter_flags Bitmask that shows what will be changed
1865
@retval error error code passed from storage engine
1868
If check_if_supported_alter returns HA_ALTER_SUPPORTED_WAIT_LOCK
1869
this call is to be wrapped with a DDL lock. This is currently NOT
1872
virtual int alter_table_phase2(THD *thd __attribute__((unused)),
1873
TABLE *altered_table __attribute__((unused)),
1874
HA_CREATE_INFO *create_info __attribute__((unused)),
1875
HA_ALTER_INFO *alter_info __attribute__((unused)),
1876
HA_ALTER_FLAGS *alter_flags __attribute__((unused)))
1878
return HA_ERR_UNSUPPORTED;
1881
Tell storage engine that changed frm file is now on disk and table
1882
has been re-opened (post-alter)
1884
@param thd The thread handle
1885
@param table The altered table, re-opened
1887
virtual int alter_table_phase3(THD *thd __attribute__((unused)),
1888
TABLE *table __attribute__((unused)))
1890
return HA_ERR_UNSUPPORTED;
1894
use_hidden_primary_key() is called in case of an update/delete when
1895
(table_flags() and HA_PRIMARY_KEY_REQUIRED_FOR_DELETE) is defined
1896
but we don't have a primary key
1898
virtual void use_hidden_primary_key();
1903
@param thd Thread handle
1904
@param lock_type HA_LOCK_IN_SHARE_MODE (F_RDLCK)
1905
HA_LOCK_IN_EXCLUSIVE_MODE (F_WRLCK)
1906
@param lock_timeout -1 default timeout
1908
>0 wait timeout in milliseconds.
1911
lock_timeout >0 is not used by MySQL currently. If the storage
1912
engine does not support NOWAIT (lock_timeout == 0) it should
1913
return an error. But if it does not support WAIT X (lock_timeout
1914
>0) it should treat it as lock_timeout == -1 and wait a default
1915
(or even hard-coded) timeout.
1917
@retval HA_ERR_WRONG_COMMAND Storage engine does not support
1919
@retval HA_ERR_UNSUPPORTED Storage engine does not support NOWAIT
1920
@retval HA_ERR_LOCK_WAIT_TIMEOUT Lock request timed out or
1921
lock conflict with NOWAIT option
1922
@retval HA_ERR_LOCK_DEADLOCK Deadlock detected
1924
virtual int lock_table(THD *thd __attribute__((unused)),
1925
int lock_type __attribute__((unused)),
1926
int lock_timeout __attribute__((unused)))
1928
return HA_ERR_WRONG_COMMAND;
512
1932
/* Service methods for use by storage engines. */
513
void ha_statistic_increment(uint64_t system_status_var::*offset) const;
514
void **ha_data(Session *) const;
1933
void ha_statistic_increment(ulong SSV::*offset) const;
1934
void **ha_data(THD *) const;
1935
THD *ha_thd(void) const;
1938
Default rename_table() and delete_table() rename/delete files with a
1939
given name and extensions from bas_ext().
1941
These methods can be overridden, but their default implementation
1942
provide useful functionality.
1944
virtual int rename_table(const char *from, const char *to);
1946
Delete a table in the engine. Called for base as well as temporary
1949
virtual int delete_table(const char *name);
517
1952
/* Private helpers */
518
inline void setTransactionReadWrite();
1953
inline void mark_trx_read_write();
521
1956
Low-level primitives for storage engines. These should be
580
2017
@return non-0 in case of failure, 0 in case of success.
581
2018
When lock_type is F_UNLCK, the return value is ignored.
583
virtual int external_lock(Session *, int)
2020
virtual int external_lock(THD *thd __attribute__((unused)),
2021
int lock_type __attribute__((unused)))
587
virtual void release_auto_increment(void) { return; }
2025
virtual void release_auto_increment(void) { return; };
588
2026
/** admin commands - called from mysql_admin_table */
589
virtual int check(Session *)
2027
virtual int check_for_upgrade(HA_CHECK_OPT *check_opt __attribute__((unused)))
2029
virtual int check(THD* thd __attribute__((unused)),
2030
HA_CHECK_OPT* check_opt __attribute__((unused)))
590
2031
{ return HA_ADMIN_NOT_IMPLEMENTED; }
592
virtual void start_bulk_insert(ha_rows)
2034
In this method check_opt can be modified
2035
to specify CHECK option to use to call check()
2038
virtual int repair(THD* thd __attribute__((unused)),
2039
HA_CHECK_OPT* check_opt __attribute__((unused)))
2040
{ return HA_ADMIN_NOT_IMPLEMENTED; }
2041
virtual void start_bulk_insert(ha_rows rows __attribute__((unused)))
594
2043
virtual int end_bulk_insert(void) { return 0; }
595
virtual int index_read(unsigned char *, const unsigned char *,
596
uint32_t, enum ha_rkey_function)
2044
virtual int index_read(uchar * buf __attribute__((unused)),
2045
const uchar * key __attribute__((unused)),
2046
uint key_len __attribute__((unused)),
2047
enum ha_rkey_function find_flag __attribute__((unused)))
597
2048
{ return HA_ERR_WRONG_COMMAND; }
598
virtual int index_read_last(unsigned char *, const unsigned char *, uint32_t)
599
{ return (errno= HA_ERR_WRONG_COMMAND); }
2049
virtual int index_read_last(uchar * buf __attribute__((unused)),
2050
const uchar * key __attribute__((unused)),
2051
uint key_len __attribute__((unused)))
2052
{ return (my_errno= HA_ERR_WRONG_COMMAND); }
2054
This method is similar to update_row, however the handler doesn't need
2055
to execute the updates at this point in time. The handler can be certain
2056
that another call to bulk_update_row will occur OR a call to
2057
exec_bulk_update before the set of updates in this query is concluded.
2059
@param old_data Old record
2060
@param new_data New record
2061
@param dup_key_found Number of duplicate keys found
2063
@retval 0 Bulk delete used by handler
2064
@retval 1 Bulk delete not used, normal operation used
2066
virtual int bulk_update_row(const uchar *old_data __attribute__((unused)),
2067
uchar *new_data __attribute__((unused)),
2068
uint *dup_key_found __attribute__((unused)))
2071
return HA_ERR_WRONG_COMMAND;
601
2074
This is called to delete all rows in a table
602
If the Cursor don't support this, then this function will
2075
If the handler don't support this, then this function will
603
2076
return HA_ERR_WRONG_COMMAND and MySQL will delete the rows one
606
2079
virtual int delete_all_rows(void)
607
{ return (errno=HA_ERR_WRONG_COMMAND); }
2080
{ return (my_errno=HA_ERR_WRONG_COMMAND); }
609
2082
Reset the auto-increment counter to the given value, i.e. the next row
610
2083
inserted will get the given value. This is called e.g. after TRUNCATE
611
2084
is emulated by doing a 'DELETE FROM t'. HA_ERR_WRONG_COMMAND is
612
2085
returned by storage engines that don't support this operation.
614
virtual int reset_auto_increment(uint64_t)
615
{ return HA_ERR_WRONG_COMMAND; }
617
virtual int analyze(Session *)
618
{ return HA_ADMIN_NOT_IMPLEMENTED; }
620
virtual int disable_indexes(uint32_t)
621
{ return HA_ERR_WRONG_COMMAND; }
623
virtual int enable_indexes(uint32_t)
624
{ return HA_ERR_WRONG_COMMAND; }
626
virtual int discard_or_import_tablespace(bool)
627
{ return (errno=HA_ERR_WRONG_COMMAND); }
630
@todo this is just for the HEAP engine, it should
631
be removed at some point in the future (and
632
no new engine should ever use it). Right
633
now HEAP does rely on it, so we cannot remove it.
2087
virtual int reset_auto_increment(uint64_t value __attribute__((unused)))
2088
{ return HA_ERR_WRONG_COMMAND; }
2089
virtual int optimize(THD* thd __attribute__((unused)),
2090
HA_CHECK_OPT* check_opt __attribute__((unused)))
2091
{ return HA_ADMIN_NOT_IMPLEMENTED; }
2092
virtual int analyze(THD* thd __attribute__((unused)),
2093
HA_CHECK_OPT* check_opt __attribute__((unused)))
2094
{ return HA_ADMIN_NOT_IMPLEMENTED; }
2095
virtual bool check_and_repair(THD *thd __attribute__((unused)))
2097
virtual int disable_indexes(uint mode __attribute__((unused)))
2098
{ return HA_ERR_WRONG_COMMAND; }
2099
virtual int enable_indexes(uint mode __attribute__((unused)))
2100
{ return HA_ERR_WRONG_COMMAND; }
2101
virtual int discard_or_import_tablespace(bool discard __attribute__((unused)))
2102
{ return (my_errno=HA_ERR_WRONG_COMMAND); }
2103
virtual void prepare_for_alter(void) { return; }
635
2104
virtual void drop_table(const char *name);
2105
virtual int create(const char *name __attribute__((unused)),
2106
TABLE *form __attribute__((unused)),
2107
HA_CREATE_INFO *info __attribute__((unused)))=0;
2109
virtual int create_handler_files(const char *name __attribute__((unused)),
2110
const char *old_name __attribute__((unused)),
2111
int action_flag __attribute__((unused)),
2112
HA_CREATE_INFO *info __attribute__((unused)))
2119
A Disk-Sweep MRR interface implementation
2121
This implementation makes range (and, in the future, 'ref') scans to read
2122
table rows in disk sweeps.
2124
Currently it is used by MyISAM and InnoDB. Potentially it can be used with
2125
any table handler that has non-clustered indexes and on-disk rows.
2131
typedef void (handler::*range_check_toggle_func_t)(bool on);
2136
handler *h; /* The "owner" handler object. It is used for scanning the index */
2137
TABLE *table; /* Always equal to h->table */
2140
Secondary handler object. It is used to retrieve full table rows by
2145
/* Buffer to store rowids, or (rowid, range_id) pairs */
2147
uchar *rowids_buf_cur; /* Current position when reading/writing */
2148
uchar *rowids_buf_last; /* When reading: end of used buffer space */
2149
uchar *rowids_buf_end; /* End of the buffer */
2151
bool dsmrr_eof; /* true <=> We have reached EOF when reading index tuples */
2153
/* true <=> need range association, buffer holds {rowid, range_id} pairs */
2156
bool use_default_impl; /* true <=> shortcut all calls to default MRR impl */
2158
void init(handler *h_arg, TABLE *table_arg)
2163
int dsmrr_init(handler *h, KEY *key, RANGE_SEQ_IF *seq_funcs,
2164
void *seq_init_param, uint n_ranges, uint mode,
2165
HANDLER_BUFFER *buf);
2167
int dsmrr_fill_buffer(handler *h);
2168
int dsmrr_next(handler *h, char **range_info);
2170
int dsmrr_info(uint keyno, uint n_ranges, uint keys, uint *bufsz,
2171
uint *flags, COST_VECT *cost);
2173
ha_rows dsmrr_info_const(uint keyno, RANGE_SEQ_IF *seq,
2174
void *seq_init_param, uint n_ranges, uint *bufsz,
2175
uint *flags, COST_VECT *cost);
2177
bool key_uses_partial_cols(uint keyno);
2178
bool choose_mrr_impl(uint keyno, ha_rows rows, uint *flags, uint *bufsz,
2180
bool get_disk_sweep_mrr_cost(uint keynr, ha_rows rows, uint flags,
2181
uint *buffer_size, COST_VECT *cost);
638
2184
extern const char *ha_row_type[];
2185
extern const char *tx_isolation_names[];
2186
extern const char *binlog_format_names[];
2187
extern TYPELIB tx_isolation_typelib;
2188
extern TYPELIB myisam_stats_method_typelib;
2189
extern uint32_t total_ha, total_ha_2pc;
2191
/* Wrapper functions */
2192
#define ha_commit(thd) (ha_commit_trans((thd), true))
2193
#define ha_rollback(thd) (ha_rollback_trans((thd), true))
2196
handlerton *ha_default_handlerton(THD *thd);
2197
plugin_ref ha_resolve_by_name(THD *thd, const LEX_STRING *name);
2198
plugin_ref ha_lock_engine(THD *thd, handlerton *hton);
2199
handlerton *ha_resolve_by_legacy_type(THD *thd, enum legacy_db_type db_type);
2200
handler *get_new_handler(TABLE_SHARE *share, MEM_ROOT *alloc,
2201
handlerton *db_type);
2202
handlerton *ha_checktype(THD *thd, enum legacy_db_type database_type,
2203
bool no_substitute, bool report_error);
2206
static inline enum legacy_db_type ha_legacy_type(const handlerton *db_type)
2208
return (db_type == NULL) ? DB_TYPE_UNKNOWN : db_type->db_type;
2211
static inline const char *ha_resolve_storage_engine_name(const handlerton *db_type)
2213
return db_type == NULL ? "UNKNOWN" : hton2plugin[db_type->slot]->name.str;
2216
static inline bool ha_check_storage_engine_flag(const handlerton *db_type, uint32_t flag)
2218
return db_type == NULL ? false : test(db_type->flags & flag);
2221
static inline bool ha_storage_engine_is_enabled(const handlerton *db_type)
2223
return (db_type && db_type->create) ?
2224
(db_type->state == SHOW_OPTION_YES) : false;
640
2227
/* basic stuff */
641
void ha_init_errors(void);
644
SortField *make_unireg_sortorder(Order *order, uint32_t *length,
645
SortField *sortorder);
646
int setup_order(Session *session, Item **ref_pointer_array, TableList *tables,
647
List<Item> &fields, List <Item> &all_fields, Order *order);
648
int setup_group(Session *session, Item **ref_pointer_array, TableList *tables,
649
List<Item> &fields, List<Item> &all_fields, Order *order,
650
bool *hidden_group_fields);
651
bool fix_inner_refs(Session *session, List<Item> &all_fields, Select_Lex *select,
652
Item **ref_pointer_array);
654
bool handle_select(Session *session, LEX *lex, select_result *result,
655
uint64_t setup_tables_done_option);
656
void free_underlaid_joins(Session *session, Select_Lex *select);
658
bool handle_derived(LEX *lex, bool (*processor)(Session *session,
661
bool derived_prepare(Session *session, LEX *lex, TableList *t);
662
bool derived_filling(Session *session, LEX *lex, TableList *t);
663
int prepare_create_field(CreateField *sql_field,
664
uint32_t *blob_columns,
665
int *timestamps, int *timestamps_with_niladic);
667
bool create_table(Session *session,
668
const identifier::Table &identifier,
669
HA_CREATE_INFO *create_info,
670
message::Table &table_proto,
671
AlterInfo *alter_info,
672
bool tmp_table, uint32_t select_field_count,
673
bool is_if_not_exists);
675
bool create_table_no_lock(Session *session,
676
const identifier::Table &identifier,
677
HA_CREATE_INFO *create_info,
678
message::Table &table_proto,
679
AlterInfo *alter_info,
680
bool tmp_table, uint32_t select_field_count,
681
bool is_if_not_exists);
683
bool create_like_table(Session* session,
684
identifier::Table::const_reference destination_identifier,
685
identifier::Table::const_reference source_identifier,
686
message::Table &create_table_proto,
687
bool is_if_not_exists,
690
bool rename_table(Session &session,
691
plugin::StorageEngine *base,
692
const identifier::Table &old_identifier,
693
const identifier::Table &new_identifier);
695
bool prepare_update(Session *session, TableList *table_list,
696
Item **conds, uint32_t order_num, Order *order);
697
int update_query(Session *session,TableList *tables,List<Item> &fields,
698
List<Item> &values,COND *conds,
699
uint32_t order_num, Order *order, ha_rows limit,
700
enum enum_duplicates handle_duplicates, bool ignore);
701
bool prepare_insert(Session *session, TableList *table_list, Table *table,
702
List<Item> &fields, List_item *values,
703
List<Item> &update_fields,
704
List<Item> &update_values, enum_duplicates duplic,
705
COND **where, bool select_insert,
706
bool check_fields, bool abort_on_warning);
707
bool insert_query(Session *session,TableList *table,List<Item> &fields,
708
List<List_item> &values, List<Item> &update_fields,
709
List<Item> &update_values, enum_duplicates flag,
711
int check_that_all_fields_are_given_values(Session *session, Table *entry,
712
TableList *table_list);
713
int prepare_delete(Session *session, TableList *table_list, Item **conds);
714
bool delete_query(Session *session, TableList *table_list, COND *conds,
715
SQL_LIST *order, ha_rows rows, uint64_t options,
716
bool reset_auto_increment);
717
bool truncate(Session& session, TableList *table_list);
718
TableShare *get_table_share(Session *session, TableList *table_list, char *key,
719
uint32_t key_length, uint32_t db_flags, int *error);
720
TableShare *get_cached_table_share(const char *db, const char *table_name);
721
bool reopen_name_locked_table(Session* session, TableList* table_list, bool link_in);
722
bool reopen_tables(Session *session,bool get_locks,bool in_refresh);
723
void close_handle_and_leave_table_as_lock(Table *table);
724
bool wait_for_tables(Session *session);
725
bool table_is_used(Table *table, bool wait_for_name_lock);
726
Table *drop_locked_tables(Session *session, const drizzled::identifier::Table &identifier);
727
void abort_locked_tables(Session *session, const drizzled::identifier::Table &identifier);
728
extern Field *not_found_field;
729
extern Field *view_ref_found;
732
find_field_in_tables(Session *session, Item_ident *item,
733
TableList *first_table, TableList *last_table,
734
Item **ref, find_item_error_report_type report_error,
735
bool register_tree_change);
737
find_field_in_table_ref(Session *session, TableList *table_list,
738
const char *name, uint32_t length,
739
const char *item_name, const char *db_name,
740
const char *table_name, Item **ref,
742
uint32_t *cached_field_index_ptr,
743
bool register_tree_change, TableList **actual_table);
745
find_field_in_table(Session *session, Table *table, const char *name, uint32_t length,
746
bool allow_rowid, uint32_t *cached_field_index_ptr);
748
} /* namespace drizzled */
750
#endif /* DRIZZLED_CURSOR_H */
2228
int ha_init_errors(void);
2231
int ha_initialize_handlerton(st_plugin_int *plugin);
2232
int ha_finalize_handlerton(st_plugin_int *plugin);
2234
TYPELIB *ha_known_exts(void);
2235
void ha_close_connection(THD* thd);
2236
bool ha_flush_logs(handlerton *db_type);
2237
void ha_drop_database(char* path);
2238
int ha_create_table(THD *thd, const char *path,
2239
const char *db, const char *table_name,
2240
HA_CREATE_INFO *create_info,
2241
bool update_create_info);
2242
int ha_delete_table(THD *thd, handlerton *db_type, const char *path,
2243
const char *db, const char *alias, bool generate_warning);
2245
/* statistics and info */
2246
bool ha_show_status(THD *thd, handlerton *db_type, enum ha_stat_type stat);
2249
int ha_create_table_from_engine(THD* thd, const char *db, const char *name);
2250
int ha_discover(THD* thd, const char* dbname, const char* name,
2251
uchar** frmblob, size_t* frmlen);
2252
int ha_find_files(THD *thd,const char *db,const char *path,
2253
const char *wild, bool dir, List<LEX_STRING>* files);
2254
int ha_table_exists_in_engine(THD* thd, const char* db, const char* name);
2257
extern "C" int ha_init_key_cache(const char *name, KEY_CACHE *key_cache);
2258
int ha_resize_key_cache(KEY_CACHE *key_cache);
2259
int ha_change_key_cache_param(KEY_CACHE *key_cache);
2260
int ha_change_key_cache(KEY_CACHE *old_key_cache, KEY_CACHE *new_key_cache);
2261
int ha_end_key_cache(KEY_CACHE *key_cache);
2263
/* report to InnoDB that control passes to the client */
2264
int ha_release_temporary_latches(THD *thd);
2266
/* transactions: interface to handlerton functions */
2267
int ha_start_consistent_snapshot(THD *thd);
2268
int ha_commit_or_rollback_by_xid(XID *xid, bool commit);
2269
int ha_commit_one_phase(THD *thd, bool all);
2270
int ha_rollback_trans(THD *thd, bool all);
2271
int ha_prepare(THD *thd);
2272
int ha_recover(HASH *commit_list);
2274
/* transactions: these functions never call handlerton functions directly */
2275
int ha_commit_trans(THD *thd, bool all);
2276
int ha_autocommit_or_rollback(THD *thd, int error);
2277
int ha_enable_transaction(THD *thd, bool on);
2280
int ha_rollback_to_savepoint(THD *thd, SAVEPOINT *sv);
2281
int ha_savepoint(THD *thd, SAVEPOINT *sv);
2282
int ha_release_savepoint(THD *thd, SAVEPOINT *sv);
2284
/* these are called by storage engines */
2285
void trans_register_ha(THD *thd, bool all, handlerton *ht);
2288
Storage engine has to assume the transaction will end up with 2pc if
2289
- there is more than one 2pc-capable storage engine available
2290
- in the current transaction 2pc was not disabled yet
2292
#define trans_need_2pc(thd, all) ((total_ha_2pc > 1) && \
2293
!((all ? &thd->transaction.all : &thd->transaction.stmt)->no_2pc))
2295
#ifdef HAVE_NDB_BINLOG
2296
int ha_reset_logs(THD *thd);
2297
int ha_binlog_index_purge_file(THD *thd, const char *file);
2298
void ha_reset_slave(THD *thd);
2299
void ha_binlog_log_query(THD *thd, handlerton *db_type,
2300
enum_binlog_command binlog_command,
2301
const char *query, uint query_length,
2302
const char *db, const char *table_name);
2303
void ha_binlog_wait(THD *thd);
2304
int ha_binlog_end(THD *thd);
2306
#define ha_reset_logs(a) do {} while (0)
2307
#define ha_binlog_index_purge_file(a,b) do {} while (0)
2308
#define ha_reset_slave(a) do {} while (0)
2309
#define ha_binlog_log_query(a,b,c,d,e,f,g) do {} while (0)
2310
#define ha_binlog_wait(a) do {} while (0)
2311
#define ha_binlog_end(a) do {} while (0)