table.h
上传用户:tsgydb
上传日期:2007-04-14
资源大小:10674k
文件大小:5k
- /* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
- /* Structs that defines the TABLE */
- class Item; /* Needed by ORDER */
- class GRANT_TABLE;
- /* Order clause list element */
- typedef struct st_order {
- struct st_order *next;
- Item **item; /* Point at item in select fields */
- bool asc; /* true if ascending */
- bool free_me; /* true if item isn't shared */
- bool in_field_list; /* true if in select field list */
- Field *field; /* If tmp-table group */
- char *buff; /* If tmp-table group */
- table_map used,depend_map;
- } ORDER;
- typedef struct st_grant_info
- {
- GRANT_TABLE *grant_table;
- uint version;
- uint privilege;
- uint want_privilege;
- } GRANT_INFO;
- /* Table cache entry struct */
- class Field_timestamp;
- class Field_blob;
- struct st_table {
- handler *file;
- Field **field; /* Pointer to fields */
- Field_blob **blob_field; /* Pointer to blob fields */
- HASH name_hash; /* hash of field names */
- byte *record[3]; /* Pointer to records */
- uint fields; /* field count */
- uint reclength; /* Recordlength */
- uint rec_buff_length;
- uint keys,key_parts,primary_key,max_key_length,max_unique_length;
- uint uniques;
- uint null_fields; /* number of null fields */
- uint blob_fields; /* number of blob fields */
- key_map keys_in_use, keys_in_use_for_query;
- KEY *key_info; /* data of keys in database */
- TYPELIB keynames; /* Pointers to keynames */
- ha_rows max_rows; /* create information */
- ha_rows min_rows; /* create information */
- ulong avg_row_length; /* create information */
- ulong raid_chunksize;
- TYPELIB fieldnames; /* Pointer to fieldnames */
- TYPELIB *intervals; /* pointer to interval info */
- enum db_type db_type; /* table_type for handler */
- enum row_type row_type; /* How rows are stored */
- uint db_create_options; /* Create options from database */
- uint db_options_in_use; /* Options in use */
- uint db_record_offset; /* if HA_REC_IN_SEQ */
- uint db_stat; /* mode of file as in handler.h */
- uint raid_type,raid_chunks;
- uint status; /* Used by postfix.. */
- uint system; /* Set if system record */
- ulong time_stamp; /* Set to offset+1 of record */
- uint timestamp_field_offset;
- uint next_number_index;
- uint blob_ptr_size; /* 4 or 8 */
- uint next_number_key_offset;
- int current_lock; /* Type of lock on table */
- my_bool copy_blobs; /* copy_blobs when storing */
- my_bool null_row; /* All columns are null */
- my_bool maybe_null,outer_join; /* Used with OUTER JOIN */
- my_bool distinct,tmp_table,const_table;
- my_bool key_read;
- my_bool crypted;
- my_bool db_low_byte_first; /* Portable row format */
- my_bool locked_by_flush;
- my_bool locked_by_name;
- my_bool crashed;
- my_bool is_view;
- Field *next_number_field, /* Set if next_number is activated */
- *found_next_number_field, /* Set on open */
- *rowid_field;
- Field_timestamp *timestamp_field;
- my_string comment; /* Comment about table */
- REGINFO reginfo; /* field connections */
- MEM_ROOT mem_root;
- GRANT_INFO grant;
- char *table_cache_key;
- char *table_name,*real_name,*path;
- uint key_length; /* Length of key */
- uint tablenr,used_fields,null_bytes;
- table_map map;
- ulong version,flush_version;
- uchar *null_flags;
- IO_CACHE *io_cache; /* If sorted trough file*/
- byte *record_pointers; /* If sorted in memory */
- ha_rows found_records; /* How many records in sort */
- ORDER *group;
- key_map quick_keys, used_keys, ref_primary_key;
- ha_rows quick_rows[MAX_KEY];
- uint quick_key_parts[MAX_KEY];
- key_part_map const_key_parts[MAX_KEY];
- ulong query_id;
- uint temp_pool_slot;
- THD *in_use; /* Which thread uses this */
- struct st_table *next,*prev;
- };
- #define JOIN_TYPE_LEFT 1
- #define JOIN_TYPE_RIGHT 2
- typedef struct st_table_list {
- struct st_table_list *next;
- char *db,*name,*real_name;
- Item *on_expr; /* Used with outer join */
- struct st_table_list *natural_join; /* natural join on this table*/
- List<String> *use_index,*ignore_index;
- TABLE *table;
- GRANT_INFO grant;
- thr_lock_type lock_type;
- uint outer_join; /* Which join type */
- bool straight; /* optimize with prev table */
- bool updating; /* for replicate-do/ignore table */
- } TABLE_LIST;