table.h
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上传日期:2022-05-23
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- /* 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;
- class st_select_lex_unit;
- /* Order clause list element */
- typedef struct st_order {
- struct st_order *next;
- Item **item; /* Point at item in select fields */
- Item *item_ptr; /* Storage for initial item */
- 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;
- ulong privilege;
- ulong want_privilege;
- } GRANT_INFO;
- enum tmp_table_type {NO_TMP_TABLE=0, TMP_TABLE=1, TRANSACTIONAL_TMP_TABLE=2};
- typedef struct st_filesort_info
- {
- IO_CACHE *io_cache; /* If sorted through filebyte */
- byte *addon_buf; /* Pointer to a buffer if sorted with fields */
- uint addon_length; /* Length of the buffer */
- struct st_sort_addon_field *addon_field; /* Pointer to the fields info */
- void (*unpack)(struct st_sort_addon_field *, byte *); /* To unpack back */
- byte *record_pointers; /* If sorted in memory */
- ha_rows found_records; /* How many records in sort */
- } FILESORT_INFO;
- /*
- Values in this enum are used to indicate how a tables TIMESTAMP field
- should be treated. It can be set to the current timestamp on insert or
- update or both.
- WARNING: The values are used for bit operations. If you change the
- enum, you must keep the bitwise relation of the values. For example:
- (int) TIMESTAMP_AUTO_SET_ON_BOTH must be equal to
- (int) TIMESTAMP_AUTO_SET_ON_INSERT | (int) TIMESTAMP_AUTO_SET_ON_UPDATE.
- We use an enum here so that the debugger can display the value names.
- */
- enum timestamp_auto_set_type
- {
- TIMESTAMP_NO_AUTO_SET= 0, TIMESTAMP_AUTO_SET_ON_INSERT= 1,
- TIMESTAMP_AUTO_SET_ON_UPDATE= 2, TIMESTAMP_AUTO_SET_ON_BOTH= 3
- };
- #define clear_timestamp_auto_bits(_target_, _bits_)
- (_target_)= (enum timestamp_auto_set_type)((int)(_target_) & ~(int)(_bits_))
- /* 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 of field names (contains pointers to elements of field array) */
- HASH name_hash;
- byte *record[2]; /* Pointer to records */
- byte *default_values; /* Default values for INSERT */
- byte *insert_values; /* used by INSERT ... UPDATE */
- uint fields; /* field count */
- uint reclength; /* Recordlength */
- uint rec_buff_length;
- uint keys,key_parts,primary_key,max_key_length,max_unique_length;
- uint total_key_length;
- uint uniques;
- uint null_fields; /* number of null fields */
- uint blob_fields; /* number of blob fields */
- key_map keys_in_use, keys_for_keyread, read_only_keys;
- key_map quick_keys;
- key_map used_keys; /* keys that cover all used table fields */
- key_map 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 */
- /*
- If this table has TIMESTAMP field with auto-set property (pointed by
- timestamp_field member) then this variable indicates during which
- operations (insert only/on update/in both cases) we should set this
- field to current timestamp. If there are no such field in this table
- or we should not automatically set its value during execution of current
- statement then the variable contains TIMESTAMP_NO_AUTO_SET (i.e. 0).
- Value of this variable is set for each statement in open_table() and
- if needed cleared later in statement processing code (see mysql_update()
- as example).
- */
- timestamp_auto_set_type timestamp_field_type;
- /* Index of auto-updated TIMESTAMP field in field array */
- 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 */
- enum tmp_table_type tmp_table;
- my_bool copy_blobs; /* copy_blobs when storing */
- /*
- Used in outer joins: if true, all columns are considered to have NULL
- values, including columns declared as "not null".
- */
- my_bool null_row;
- /* 0 or JOIN_TYPE_{LEFT|RIGHT}, same as TABLE_LIST::outer_join */
- my_bool outer_join;
- my_bool maybe_null; /* true if (outer_join != 0) */
- my_bool force_index;
- my_bool distinct,const_table,no_rows;
- 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 fulltext_searched;
- my_bool crashed;
- my_bool is_view;
- my_bool no_keyread, no_cache;
- my_bool clear_query_id; /* To reset query_id for tables and cols */
- my_bool auto_increment_field_not_null;
- Field *next_number_field, /* Set if next_number is activated */
- *found_next_number_field, /* Set on open */
- *rowid_field;
- Field_timestamp *timestamp_field;
- #if MYSQL_VERSION_ID < 40100
- /*
- Indicates whenever we have to set field_length members of all TIMESTAMP
- fields to 19 (to honour 'new_mode' variable) or to original
- field_length values.
- */
- my_bool timestamp_mode;
- #endif
- my_string comment; /* Comment about table */
- CHARSET_INFO *table_charset; /* Default charset of string fields */
- REGINFO reginfo; /* field connections */
- MEM_ROOT mem_root;
- GRANT_INFO grant;
- /* A pair "database_name table_name ", widely used as simply a db name */
- 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; /* ID bit of table (1,2,4,8,16...) */
- ulong version,flush_version;
- uchar *null_flags;
- FILESORT_INFO sort;
- ORDER *group;
- ha_rows quick_rows[MAX_KEY];
- uint quick_key_parts[MAX_KEY];
- key_part_map const_key_parts[MAX_KEY];
- ulong query_id;
- uchar frm_version;
- union /* Temporary variables */
- {
- uint temp_pool_slot; /* Used by intern temp tables */
- struct st_table_list *pos_in_table_list;
- };
- /* number of select if it is derived table */
- uint derived_select_number;
- 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, *alias, *real_name;
- char *option; /* Used by cache index */
- Item *on_expr; /* Used with outer join */
- struct st_table_list *natural_join; /* natural join on this table*/
- /* ... join ... USE INDEX ... IGNORE INDEX */
- List<String> *use_index, *ignore_index;
- TABLE *table; /* opened table */
- st_table_list *table_list; /* pointer to node of list of all tables */
- class st_select_lex_unit *derived; /* SELECT_LEX_UNIT of derived table */
- GRANT_INFO grant;
- thr_lock_type lock_type;
- uint outer_join; /* Which join type */
- uint shared; /* Used in multi-upd */
- uint32 db_length, real_name_length;
- bool straight; /* optimize with prev table */
- bool updating; /* for replicate-do/ignore table */
- bool force_index; /* Prefer index over table scan */
- bool ignore_leaves; /* Preload only non-leaf nodes */
- bool cacheable_table; /* stop PS caching */
- /* used in multi-upd privelege check */
- bool table_in_update_from_clause;
- } TABLE_LIST;
- typedef struct st_changed_table_list
- {
- struct st_changed_table_list *next;
- char *key;
- uint32 key_length;
- } CHANGED_TABLE_LIST;
- typedef struct st_open_table_list
- {
- struct st_open_table_list *next;
- char *db,*table;
- uint32 in_use,locked;
- } OPEN_TABLE_LIST;