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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) 2009 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; either version 2 of the License, or
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* (at your option) any later version.
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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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This class is shared between different table objects. There is one
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instance of table share per one table in the database.
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#ifndef DRIZZLED_TABLE_SHARE_H
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#define DRIZZLED_TABLE_SHARE_H
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#include "drizzled/typelib.h"
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#include "drizzled/my_hash.h"
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#include "drizzled/memory/root.h"
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#include "drizzled/message/table.pb.h"
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table_category(TABLE_UNKNOWN_CATEGORY),
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found_next_number_field(NULL),
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timestamp_field(NULL),
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row_type(ROW_TYPE_DEFAULT),
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tmp_table(NO_TMP_TABLE),
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timestamp_field_offset(0),
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rowid_field_offset(0),
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next_number_key_offset(0),
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next_number_keypart(0),
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column_bitmap_size(0),
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db_low_byte_first(false),
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replace_with_name_lock(false),
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waiting_on_cond(false),
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TableShare(const char *key,
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const char *new_table_name,
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const char *new_path) :
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table_category(TABLE_UNKNOWN_CATEGORY),
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found_next_number_field(NULL),
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timestamp_field(NULL),
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default_values(NULL),
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stored_rec_length(0),
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row_type(ROW_TYPE_DEFAULT),
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storage_engine(NULL),
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tmp_table(NO_TMP_TABLE),
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last_null_bit_pos(0),
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max_unique_length(0),
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timestamp_field_offset(0),
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db_create_options(0),
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db_options_in_use(0),
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rowid_field_offset(0),
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next_number_index(0),
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next_number_key_offset(0),
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next_number_keypart(0),
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column_bitmap_size(0),
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db_low_byte_first(false),
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replace_with_name_lock(false),
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waiting_on_cond(false),
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init(key, key_length, new_table_name, new_path);
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/** Category of this table. */
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enum_table_category table_category;
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uint32_t open_count; /* Number of tables in open list */
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/* The following is copied to each Table on OPEN */
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Field **found_next_number_field;
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Field *timestamp_field; /* Used only during open */
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KEY *key_info; /* data of keys in database */
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uint *blob_field; /* Index to blobs in Field arrray*/
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/* hash of field names (contains pointers to elements of field array) */
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HASH name_hash; /* hash of field names */
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drizzled::memory::Root mem_root;
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TYPELIB keynames; /* Pointers to keynames */
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TYPELIB fieldnames; /* Pointer to fieldnames */
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TYPELIB *intervals; /* pointer to interval info */
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pthread_mutex_t mutex; /* For locking the share */
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pthread_cond_t cond; /* To signal that share is ready */
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unsigned char *default_values; /* row with default values */
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const CHARSET_INFO *table_charset; /* Default charset of string fields */
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Key which is used for looking-up table in table cache and in the list
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of thread's temporary tables. Has the form of:
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"database_name\0table_name\0" + optional part for temporary tables.
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Note that all three 'table_cache_key', 'db' and 'table_name' members
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must be set (and be non-zero) for tables in table cache. They also
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should correspond to each other.
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To ensure this one can use set_table_cache() methods.
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LEX_STRING table_cache_key;
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LEX_STRING db; /* Pointer to db */
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LEX_STRING table_name; /* Table name (for open) */
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LEX_STRING path; /* Path to .frm file (from datadir) */
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LEX_STRING normalized_path; /* unpack_filename(path) */
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uint32_t block_size; /* create information */
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uint32_t timestamp_offset; /* Set to offset+1 of record */
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uint32_t reclength; /* Recordlength */
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uint32_t stored_rec_length; /* Stored record length*/
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enum row_type row_type; /* How rows are stored */
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/* Max rows is a hint to HEAP during a create tmp table */
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drizzled::message::Table *table_proto;
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/* This is only used in one location currently */
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inline void setTableProto(drizzled::message::Table *arg)
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assert(table_proto == NULL);
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inline bool hasComment()
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return (table_proto) ? table_proto->options().has_comment() : false;
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inline const char *getComment()
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return (table_proto && table_proto->has_options()) ? table_proto->options().comment().c_str() : NULL;
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inline uint32_t getCommentLength()
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return (table_proto) ? table_proto->options().comment().length() : 0;
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inline bool hasKeyBlockSize()
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return (table_proto) ? table_proto->options().has_key_block_size() : false;
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inline uint32_t getKeyBlockSize()
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return (table_proto) ? table_proto->options().key_block_size() : 0;
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inline uint64_t getMaxRows()
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inline void setMaxRows(uint64_t arg)
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drizzled::plugin::StorageEngine *storage_engine; /* storage engine plugin */
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inline drizzled::plugin::StorageEngine *db_type() const /* table_type for handler */
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return storage_engine;
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inline drizzled::plugin::StorageEngine *getEngine() const /* table_type for handler */
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return storage_engine;
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enum tmp_table_type tmp_table;
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uint32_t ref_count; /* How many Table objects uses this */
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uint32_t last_null_bit_pos;
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uint32_t fields; /* Number of fields */
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uint32_t rec_buff_length; /* Size of table->record[] buffer */
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uint32_t keys, key_parts;
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uint32_t max_key_length, max_unique_length, total_key_length;
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uint32_t uniques; /* Number of UNIQUE index */
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uint32_t null_fields; /* number of null fields */
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uint32_t blob_fields; /* number of blob fields */
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uint32_t timestamp_field_offset; /* Field number for timestamp field */
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uint32_t varchar_fields; /* number of varchar fields */
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uint32_t db_create_options; /* Create options from database */
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uint32_t db_options_in_use; /* Options in use */
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uint32_t db_record_offset; /* if HA_REC_IN_SEQ */
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uint32_t rowid_field_offset; /* Field_nr +1 to rowid field */
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* Currently the replication services component uses
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* the primary_key member to determine which field is the table's
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* primary key. However, as it exists, because this member is scalar, it
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* only supports a single-column primary key. Is there a better way
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* to ask for the fields which are in a primary key?
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uint32_t primary_key;
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/* Index of auto-updated TIMESTAMP field in field array */
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uint32_t next_number_index; /* autoincrement key number */
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uint32_t next_number_key_offset; /* autoinc keypart offset in a key */
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uint32_t next_number_keypart; /* autoinc keypart number in a key */
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uint32_t error, open_errno, errarg; /* error from open_table_def() */
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uint32_t column_bitmap_size;
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uint8_t blob_ptr_size; /* 4 or 8 */
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bool db_low_byte_first; /* Portable row format */
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bool replace_with_name_lock;
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bool waiting_on_cond; /* Protection against free */
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Set of keys in use, implemented as a Bitmap.
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Excludes keys disabled by ALTER Table ... DISABLE KEYS.
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key_map keys_for_keyread;
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Set share's table cache key and update its db and table name appropriately.
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set_table_cache_key()
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key_buff Buffer with already built table cache key to be
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referenced from share.
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key_length Key length.
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Since 'key_buff' buffer will be referenced from share it should has same
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life-time as share itself.
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This method automatically ensures that TableShare::table_name/db have
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appropriate values by using table cache key as their source.
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void set_table_cache_key(char *key_buff, uint32_t key_length)
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table_cache_key.str= key_buff;
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table_cache_key.length= key_length;
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Let us use the fact that the key is "db/0/table_name/0" + optional
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part for temporary tables.
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db.str= table_cache_key.str;
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db.length= strlen(db.str);
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table_name.str= db.str + db.length + 1;
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table_name.length= strlen(table_name.str);
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Set share's table cache key and update its db and table name appropriately.
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set_table_cache_key()
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key_buff Buffer to be used as storage for table cache key
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(should be at least key_length bytes).
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key Value for table cache key.
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key_length Key length.
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Since 'key_buff' buffer will be used as storage for table cache key
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it should has same life-time as share itself.
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void set_table_cache_key(char *key_buff, const char *key, uint32_t key_length)
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memcpy(key_buff, key, key_length);
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set_table_cache_key(key_buff, key_length);
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inline bool honor_global_locks()
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return (table_category == TABLE_CATEGORY_USER);
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Initialize share for temporary tables
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key Table_cache_key, as generated from create_table_def_key.
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must start with db name.
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key_length Length of key
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table_name Table name
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path Path to file (possible in lower case) without .frm
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This is different from alloc_table_share() because temporary tables
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don't have to be shared between threads or put into the table def
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cache, so we can do some things notable simpler and faster
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If table is not put in session->temporary_tables (happens only when
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one uses OPEN TEMPORARY) then one can specify 'db' as key and
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use key_length= 0 as neither table_cache_key or key_length will be used).
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void init(const char *new_table_name,
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const char *new_path)
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init("", 0, new_table_name, new_path);
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void init(const char *key,
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uint32_t key_length, const char *new_table_name,
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const char *new_path)
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memset(this, 0, sizeof(TableShare));
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drizzled::memory::init_sql_alloc(&mem_root, TABLE_ALLOC_BLOCK_SIZE, 0);
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table_category= TABLE_CATEGORY_TEMPORARY;
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tmp_table= INTERNAL_TMP_TABLE;
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db.length= strlen(key);
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table_cache_key.str= (char*) key;
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table_cache_key.length= key_length;
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table_name.str= (char*) new_table_name;
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table_name.length= strlen(new_table_name);
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path.str= (char*) new_path;
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normalized_path.str= (char*) new_path;
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path.length= normalized_path.length= strlen(new_path);
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Free table share and memory used by it
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share->mutex must be locked when we come here if it's not a temp table
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void free_table_share()
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drizzled::memory::Root new_mem_root;
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assert(ref_count == 0);
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If someone is waiting for this to be deleted, inform it about this.
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Don't do a delete until we know that no one is refering to this anymore.
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if (tmp_table == NO_TMP_TABLE)
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/* share->mutex is locked in release_table_share() */
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while (waiting_on_cond)
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pthread_cond_broadcast(&cond);
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pthread_cond_wait(&cond, &mutex);
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/* No thread refers to this anymore */
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pthread_mutex_unlock(&mutex);
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pthread_mutex_destroy(&mutex);
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pthread_cond_destroy(&cond);
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hash_free(&name_hash);
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storage_engine= NULL;
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/* We must copy mem_root from share because share is allocated through it */
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memcpy(&new_mem_root, &mem_root, sizeof(new_mem_root));
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free_root(&new_mem_root, MYF(0)); // Free's share
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void open_table_error(int pass_error, int db_errno, int pass_errarg);
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Create a table cache key
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key Create key here (must be of size MAX_DBKEY_LENGTH)
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table_list Table definition
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The table cache_key is created from:
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if the table is a tmp table, we add the following to make each tmp table
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4 bytes for master thread id
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4 bytes pseudo thread id
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static inline uint32_t createKey(char *key, std::string& db_arg,
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std::string& table_name_arg)
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return createKey(key, db_arg.c_str(), table_name_arg.c_str());
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static inline uint32_t createKey(char *key, const char *db_arg, const char *table_name_arg)
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key_pos= strcpy(key_pos, db_arg) + strlen(db_arg);
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key_pos= strcpy(key_pos+1, table_name_arg) +
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strlen(table_name_arg);
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key_length= (uint32_t)(key_pos-key)+1;
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static void cacheStart(void);
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static void cacheStop(void);
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static void release(TableShare *share);
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static void release(const char *key, uint32_t key_length);
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static TableShare *getShare(const char *db, const char *table_name);
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static TableShare *getShare(Session *session,
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TableList *table_list, char *key,
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uint32_t key_length, uint32_t, int *error);
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#endif /* DRIZZLED_TABLE_SHARE_H */