dict0dict.h

这是linux下运行的mysql软件包,可用于linux 下安装 php + mysql + apach 的网络配置

/******************************************************
Data dictionary system

(c) 1996 Innobase Oy

Created 1/8/1996 Heikki Tuuri
*******************************************************/

#ifndef dict0dict_h
#define dict0dict_h

#include "univ.i"
#include "dict0types.h"
#include "dict0mem.h"
#include "data0type.h"
#include "data0data.h"
#include "sync0sync.h"
#include "sync0rw.h"
#include "mem0mem.h"
#include "rem0types.h"
#include "btr0types.h"
#include "ut0mem.h"
#include "ut0lst.h"
#include "hash0hash.h"
#include "ut0rnd.h"
#include "ut0byte.h"
#include "trx0types.h"

/**********************************************************************
Makes all characters in a NUL-terminated UTF-8 string lower case. */

void
dict_casedn_str(
/*============*/
	char*	a);	/* in/out: string to put in lower case */
/************************************************************************
Get the database name length in a table name. */

ulint
dict_get_db_name_len(
/*=================*/
				/* out: database name length */
	const char*	name);	/* in: table name in the form
				dbname '/' tablename */
/*************************************************************************
Accepts a specified string. Comparisons are case-insensitive. */

const char*
dict_accept(
/*========*/
				/* out: if string was accepted, the pointer
				is moved after that, else ptr is returned */
	const char*	ptr,	/* in: scan from this */
	const char*	string,	/* in: accept only this string as the next
				non-whitespace string */
	ibool*		success);/* out: TRUE if accepted */
/************************************************************************
Decrements the count of open MySQL handles to a table. */

void
dict_table_decrement_handle_count(
/*==============================*/
	dict_table_t*	table);	/* in: table */
/**************************************************************************
Inits the data dictionary module. */

void
dict_init(void);
/*===========*/
/************************************************************************
Gets the space id of every table of the data dictionary and makes a linear
list and a hash table of them to the data dictionary cache. This function
can be called at database startup if we did not need to do a crash recovery.
In crash recovery we must scan the space id's from the .ibd files in MySQL
database directories. */

void
dict_load_space_id_list(void);
/*=========================*/
/*************************************************************************
Gets the column data type. */
UNIV_INLINE
dtype_t*
dict_col_get_type(
/*==============*/
	dict_col_t*	col);
/*************************************************************************
Gets the column number. */
UNIV_INLINE
ulint
dict_col_get_no(
/*============*/
	dict_col_t*	col);
/*************************************************************************
Gets the column position in the clustered index. */
UNIV_INLINE
ulint
dict_col_get_clust_pos(
/*===================*/
	dict_col_t*	col);
/************************************************************************
Initializes the autoinc counter. It is not an error to initialize an already
initialized counter. */

void
dict_table_autoinc_initialize(
/*==========================*/
	dict_table_t*	table,	/* in: table */
	ib_longlong	value);	/* in: next value to assign to a row */
/************************************************************************
Gets the next autoinc value (== autoinc counter value), 0 if not yet
initialized. If initialized, increments the counter by 1. */

ib_longlong
dict_table_autoinc_get(
/*===================*/
				/* out: value for a new row, or 0 */
	dict_table_t*	table);	/* in: table */
/************************************************************************
Decrements the autoinc counter value by 1. */

void
dict_table_autoinc_decrement(
/*=========================*/
	dict_table_t*	table);	/* in: table */
/************************************************************************
Reads the next autoinc value (== autoinc counter value), 0 if not yet
initialized. */

ib_longlong
dict_table_autoinc_read(
/*====================*/
				/* out: value for a new row, or 0 */
	dict_table_t*	table);	/* in: table */
/************************************************************************
Peeks the autoinc counter value, 0 if not yet initialized. Does not
increment the counter. The read not protected by any mutex! */

ib_longlong
dict_table_autoinc_peek(
/*====================*/
				/* out: value of the counter */
	dict_table_t*	table);	/* in: table */
/************************************************************************
Updates the autoinc counter if the value supplied is equal or bigger than the
current value. If not inited, does nothing. */

void
dict_table_autoinc_update(
/*======================*/

	dict_table_t*	table,	/* in: table */
	ib_longlong	value);	/* in: value which was assigned to a row */
/**************************************************************************
Adds a table object to the dictionary cache. */

void
dict_table_add_to_cache(
/*====================*/
	dict_table_t*	table);	/* in: table */
/**************************************************************************
Removes a table object from the dictionary cache. */

void
dict_table_remove_from_cache(
/*=========================*/
	dict_table_t*	table);	/* in, own: table */
/**************************************************************************
Renames a table object. */

ibool
dict_table_rename_in_cache(
/*=======================*/
					/* out: TRUE if success */
	dict_table_t*	table,		/* in: table */
	const char*	new_name,	/* in: new name */
	ibool		rename_also_foreigns);/* in: in ALTER TABLE we want
					to preserve the original table name
					in constraints which reference it */
/**************************************************************************
Change the id of a table object in the dictionary cache. This is used in
DISCARD TABLESPACE. */

void
dict_table_change_id_in_cache(
/*==========================*/
	dict_table_t*	table,	/* in: table object already in cache */
	dulint		new_id);/* in: new id to set */
/**************************************************************************
Adds a foreign key constraint object to the dictionary cache. May free
the object if there already is an object with the same identifier in.
At least one of foreign table or referenced table must already be in
the dictionary cache! */

ulint
dict_foreign_add_to_cache(
/*======================*/
					/* out: DB_SUCCESS or error code */
	dict_foreign_t*	foreign,	/* in, own: foreign key constraint */
	ibool		check_charsets);/* in: TRUE=check charset
					compatibility */
/*************************************************************************
Checks if a table is referenced by foreign keys. */

ibool
dict_table_referenced_by_foreign_key(
/*=================================*/
				/* out: TRUE if table is referenced by a
				foreign key */
	dict_table_t*	table);	/* in: InnoDB table */
/*************************************************************************
Scans a table create SQL string and adds to the data dictionary
the foreign key constraints declared in the string. This function
should be called after the indexes for a table have been created.
Each foreign key constraint must be accompanied with indexes in
bot participating tables. The indexes are allowed to contain more
fields than mentioned in the constraint. */

ulint
dict_create_foreign_constraints(
/*============================*/
					/* out: error code or DB_SUCCESS */
	trx_t*		trx,		/* in: transaction */
	const char*	sql_string,	/* in: table create statement where
					foreign keys are declared like:
					FOREIGN KEY (a, b) REFERENCES
					table2(c, d), table2 can be written
					also with the database
					name before it: test.table2; the
					default database id the database of
					parameter name */
	const char*	name,		/* in: table full name in the
					normalized form
					database_name/table_name */
	ibool		reject_fks);	/* in: if TRUE, fail with error
					code DB_CANNOT_ADD_CONSTRAINT if
					any foreign keys are found. */
/**************************************************************************
Parses the CONSTRAINT id's to be dropped in an ALTER TABLE statement. */

ulint
dict_foreign_parse_drop_constraints(
/*================================*/
						/* out: DB_SUCCESS or
						DB_CANNOT_DROP_CONSTRAINT if
						syntax error or the constraint
						id does not match */
	mem_heap_t*	heap,			/* in: heap from which we can
						allocate memory */
	trx_t*		trx,			/* in: transaction */
	dict_table_t*	table,			/* in: table */
	ulint*		n,			/* out: number of constraints
						to drop */
	const char***	constraints_to_drop);	/* out: id's of the
						constraints to drop */
/**************************************************************************
Returns a table object and memoryfixes it. NOTE! This is a high-level
function to be used mainly from outside the 'dict' directory. Inside this
directory dict_table_get_low is usually the appropriate function. */

dict_table_t*
dict_table_get(
/*===========*/
					/* out: table, NULL if
					does not exist */
	const char*	table_name,	/* in: table name */
	trx_t*		trx);		/* in: transaction handle */
/**************************************************************************
Returns a table object and increments MySQL open handle count on the table.
*/

dict_table_t*
dict_table_get_and_increment_handle_count(
/*======================================*/
					/* out: table, NULL if
					does not exist */
	const char*	table_name,	/* in: table name */
	trx_t*		trx);		/* in: transaction handle or NULL */
/**************************************************************************
Returns a table object, based on table id, and memoryfixes it. */

dict_table_t*
dict_table_get_on_id(
/*=================*/
				/* out: table, NULL if does not exist */
	dulint	table_id,	/* in: table id */
	trx_t*	trx);		/* in: transaction handle */
/**************************************************************************
Returns a table object, based on table id, and memoryfixes it. */
UNIV_INLINE
dict_table_t*
dict_table_get_on_id_low(
/*=====================*/
				/* out: table, NULL if does not exist */
	dulint	table_id,	/* in: table id */
	trx_t*	trx);		/* in: transaction handle */
/**************************************************************************
Releases a table from being memoryfixed. Currently this has no relevance. */
UNIV_INLINE
void
dict_table_release(
/*===============*/
	dict_table_t*	table);	/* in: table to be released */
/**************************************************************************
Checks if a table is in the dictionary cache. */
UNIV_INLINE
dict_table_t*
dict_table_check_if_in_cache_low(
/*==============================*/
					/* out: table, NULL if not found */
	const char*	table_name);	/* in: table name */
/**************************************************************************
Gets a table; loads it to the dictionary cache if necessary. A low-level
function. */
UNIV_INLINE
dict_table_t*
dict_table_get_low(
/*===============*/
					/* out: table, NULL if not found */
	const char*	table_name);	/* in: table name */
/**************************************************************************
Returns an index object. */