dict0load.h

/*****************************************************************************

Copyright (c) 1996, 2013, Innobase Oy. All Rights Reserved.

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; version 2 of the License.

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., 
51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA

*****************************************************************************/

/**************************************************//**
@file include/dict0load.h
Loads to the memory cache database object definitions
from dictionary tables

Created 4/24/1996 Heikki Tuuri
*******************************************************/

#ifndef dict0load_h
#define dict0load_h

#include "univ.i"
#include "dict0types.h"
#include "ut0byte.h"
#include "mem0mem.h"
#include "btr0types.h"
#include "ut0rbt.h"

/** enum that defines all 6 system table IDs */
enum dict_system_table_id {
	SYS_TABLES = 0,
	SYS_INDEXES,
	SYS_COLUMNS,
	SYS_FIELDS,
	SYS_FOREIGN,
	SYS_FOREIGN_COLS,
	SYS_STATS,

	/* This must be last item. Defines the number of system tables. */
	SYS_NUM_SYSTEM_TABLES
};

typedef enum dict_system_table_id	dict_system_id_t;

/** Status bit for dict_process_sys_tables_rec() */
enum dict_table_info {
	DICT_TABLE_LOAD_FROM_RECORD = 0,/*!< Directly populate a dict_table_t
					structure with information from
					a SYS_TABLES record */
	DICT_TABLE_LOAD_FROM_CACHE = 1,	/*!< Check first whether dict_table_t
					is in the cache, if so, return it */
	DICT_TABLE_UPDATE_STATS = 2	/*!< whether to update statistics
					when loading SYS_TABLES information. */
};

typedef enum dict_table_info	dict_table_info_t;

/********************************************************************//**
In a crash recovery we already have all the tablespace objects created.
This function compares the space id information in the InnoDB data dictionary
to what we already read with fil_load_single_table_tablespaces().

In a normal startup, we create the tablespace objects for every table in
InnoDB's data dictionary, if the corresponding .ibd file exists.
We also scan the biggest space id, and store it to fil_system. */
UNIV_INTERN
void
dict_check_tablespaces_and_store_max_id(
/*====================================*/
	ibool	in_crash_recovery);	/*!< in: are we doing a crash recovery */
/********************************************************************//**
Finds the first table name in the given database.
@return own: table name, NULL if does not exist; the caller must free
the memory in the string! */
UNIV_INTERN
char*
dict_get_first_table_name_in_db(
/*============================*/
	const char*	name);	/*!< in: database name which ends to '/' */

/********************************************************************//**
Loads a table definition from a SYS_TABLES record to dict_table_t.
Does not load any columns or indexes.
@return error message, or NULL on success */
UNIV_INTERN
const char*
dict_load_table_low(
/*================*/
	const char*	name,		/*!< in: table name */
	const rec_t*	rec,		/*!< in: SYS_TABLES record */
	dict_table_t**	table);		/*!< out,own: table, or NULL */
/********************************************************************//**
Loads a table column definition from a SYS_COLUMNS record to
dict_table_t.
@return error message, or NULL on success */
UNIV_INTERN
const char*
dict_load_column_low(
/*=================*/
	dict_table_t*	table,		/*!< in/out: table, could be NULL
					if we just populate a dict_column_t
					struct with information from
					a SYS_COLUMNS record */
	mem_heap_t*	heap,		/*!< in/out: memory heap
					for temporary storage */
	dict_col_t*	column,		/*!< out: dict_column_t to fill,
					or NULL if table != NULL */
	table_id_t*	table_id,	/*!< out: table id */
	const char**	col_name,	/*!< out: column name */
	const rec_t*	rec);		/*!< in: SYS_COLUMNS record */
/********************************************************************//**
Loads an index definition from a SYS_INDEXES record to dict_index_t.
If allocate=TRUE, we will create a dict_index_t structure and fill it
accordingly. If allocated=FALSE, the dict_index_t will be supplied by
the caller and filled with information read from the record.  @return
error message, or NULL on success */
UNIV_INTERN
const char*
dict_load_index_low(
/*================*/
	byte*		table_id,	/*!< in/out: table id (8 bytes),
					an "in" value if allocate=TRUE
					and "out" when allocate=FALSE */
	const char*	table_name,	/*!< in: table name */
	mem_heap_t*	heap,		/*!< in/out: temporary memory heap */
	const rec_t*	rec,		/*!< in: SYS_INDEXES record */
	ibool		allocate,	/*!< in: TRUE=allocate *index,
					FALSE=fill in a pre-allocated
					*index */
	dict_index_t**	index);		/*!< out,own: index, or NULL */
/********************************************************************//**
Loads an index field definition from a SYS_FIELDS record to
dict_index_t.
@return error message, or NULL on success */
UNIV_INTERN
const char*
dict_load_field_low(
/*================*/
	byte*		index_id,	/*!< in/out: index id (8 bytes)
					an "in" value if index != NULL
					and "out" if index == NULL */
	dict_index_t*	index,		/*!< in/out: index, could be NULL
					if we just populate a dict_field_t
					struct with information from
					a SYS_FIELDS record */
	dict_field_t*	sys_field,	/*!< out: dict_field_t to be
					filled */
	ulint*		pos,		/*!< out: Field position */
	byte*		last_index_id,	/*!< in: last index id */
	mem_heap_t*	heap,		/*!< in/out: memory heap
					for temporary storage */
	const rec_t*	rec,		/*!< in: SYS_FIELDS record */
	char*		addition_err_str,/*!< out: additional error message
					that requires information to be
					filled, or NULL */
	ulint		err_str_len);	/*!< in: length of addition_err_str
					in bytes */
/********************************************************************//**
Loads a table definition and also all its index definitions, and also
the cluster definition if the table is a member in a cluster. Also loads
all foreign key constraints where the foreign key is in the table or where
a foreign key references columns in this table.
@return table, NULL if does not exist; if the table is stored in an
.ibd file, but the file does not exist, then we set the
ibd_file_missing flag TRUE in the table object we return */
UNIV_INTERN
dict_table_t*
dict_load_table(
/*============*/
	const char*	name,	/*!< in: table name in the
				databasename/tablename format */
	ibool		cached,	/*!< in: TRUE=add to cache, FALSE=do not */
	dict_err_ignore_t ignore_err);
				/*!< in: error to be ignored when loading
				table and its indexes' definition */
/***********************************************************************//**
Loads a table object based on the table id.
@return	table; NULL if table does not exist */
UNIV_INTERN
dict_table_t*
dict_load_table_on_id(
/*==================*/
	table_id_t	table_id);	/*!< in: table id */
/********************************************************************//**
This function is called when the database is booted.
Loads system table index definitions except for the clustered index which
is added to the dictionary cache at booting before calling this function. */
UNIV_INTERN
void
dict_load_sys_table(
/*================*/
	dict_table_t*	table);	/*!< in: system table */
/***********************************************************************//**
Loads foreign key constraints where the table is either the foreign key
holder or where the table is referenced by a foreign key. Adds these
constraints to the data dictionary. Note that we know that the dictionary
cache already contains all constraints where the other relevant table is
already in the dictionary cache.
@return	DB_SUCCESS or error code */
UNIV_INTERN
ulint
dict_load_foreigns(
/*===============*/
	const char*		table_name,	/*!< in: table name */
	ibool			check_recursive,/*!< in: Whether to check
						recursive load of tables
						chained by FK */
	ibool			check_charsets,	/*!< in: TRUE=check charsets
						compatibility */
	dict_err_ignore_t	ignore_err);	/*!< in: error to be ignored */
/********************************************************************//**
Prints to the standard output information on all tables found in the data
dictionary system table. */
UNIV_INTERN
void
dict_print(void);
/*============*/

/********************************************************************//**
This function opens a system table, and return the first record.
@return	first record of the system table */
UNIV_INTERN
const rec_t*
dict_startscan_system(
/*==================*/
	btr_pcur_t*	pcur,		/*!< out: persistent cursor to
					the record */
	mtr_t*		mtr,		/*!< in: the mini-transaction */
	dict_system_id_t system_id);	/*!< in: which system table to open */
/********************************************************************//**
This function get the next system table record as we scan the table.
@return	the record if found, NULL if end of scan. */
UNIV_INTERN
const rec_t*
dict_getnext_system(
/*================*/
	btr_pcur_t*	pcur,		/*!< in/out: persistent cursor
					to the record */
	mtr_t*		mtr);		/*!< in: the mini-transaction */
/********************************************************************//**
This function processes one SYS_TABLES record and populate the dict_table_t
struct for the table. Extracted out of dict_print() to be used by
both monitor table output and information schema innodb_sys_tables output.
@return error message, or NULL on success */
UNIV_INTERN
const char*
dict_process_sys_tables_rec(
/*========================*/
	mem_heap_t*	heap,		/*!< in: temporary memory heap */
	const rec_t*	rec,		/*!< in: SYS_TABLES record */
	dict_table_t**	table,		/*!< out: dict_table_t to fill */
	dict_table_info_t status);	/*!< in: status bit controls
					options such as whether we shall
					look for dict_table_t from cache
					first */
/********************************************************************//**
This function parses a SYS_INDEXES record and populate a dict_index_t
structure with the information from the record. For detail information
about SYS_INDEXES fields, please refer to dict_boot() function.
@return error message, or NULL on success */
UNIV_INTERN
const char*
dict_process_sys_indexes_rec(
/*=========================*/
	mem_heap_t*	heap,		/*!< in/out: heap memory */
	const rec_t*	rec,		/*!< in: current SYS_INDEXES rec */
	dict_index_t*	index,		/*!< out: dict_index_t to be
					filled */
	table_id_t*	table_id);	/*!< out: table id */
/********************************************************************//**
This function parses a SYS_COLUMNS record and populate a dict_column_t
structure with the information from the record.
@return error message, or NULL on success */
UNIV_INTERN
const char*
dict_process_sys_columns_rec(
/*=========================*/
	mem_heap_t*	heap,		/*!< in/out: heap memory */
	const rec_t*	rec,		/*!< in: current SYS_COLUMNS rec */
	dict_col_t*	column,		/*!< out: dict_col_t to be filled */
	table_id_t*	table_id,	/*!< out: table id */
	const char**	col_name);	/*!< out: column name */
/********************************************************************//**
This function parses a SYS_FIELDS record and populate a dict_field_t
structure with the information from the record.
@return error message, or NULL on success */
UNIV_INTERN
const char*
dict_process_sys_fields_rec(
/*========================*/
	mem_heap_t*	heap,		/*!< in/out: heap memory */
	const rec_t*	rec,		/*!< in: current SYS_FIELDS rec */
	dict_field_t*	sys_field,	/*!< out: dict_field_t to be
					filled */
	ulint*		pos,		/*!< out: Field position */
	index_id_t*	index_id,	/*!< out: current index id */
	index_id_t	last_id);	/*!< in: previous index id */
/********************************************************************//**
This function parses a SYS_FOREIGN record and populate a dict_foreign_t
structure with the information from the record. For detail information
about SYS_FOREIGN fields, please refer to dict_load_foreign() function
@return error message, or NULL on success */
UNIV_INTERN
const char*
dict_process_sys_foreign_rec(
/*=========================*/
	mem_heap_t*	heap,		/*!< in/out: heap memory */
	const rec_t*	rec,		/*!< in: current SYS_FOREIGN rec */
	dict_foreign_t*	foreign);	/*!< out: dict_foreign_t to be
					filled */
/********************************************************************//**
This function parses a SYS_FOREIGN_COLS record and extract necessary
information from the record and return to caller.
@return error message, or NULL on success */
UNIV_INTERN
const char*
dict_process_sys_foreign_col_rec(
/*=============================*/
	mem_heap_t*	heap,		/*!< in/out: heap memory */
	const rec_t*	rec,		/*!< in: current SYS_FOREIGN_COLS rec */
	const char**	name,		/*!< out: foreign key constraint name */
	const char**	for_col_name,	/*!< out: referencing column name */
	const char**	ref_col_name,	/*!< out: referenced column name
					in referenced table */
	ulint*		pos);		/*!< out: column position */
/********************************************************************//**
This function parses a SYS_STATS record and extract necessary
information from the record and return to caller.
@return error message, or NULL on success */
UNIV_INTERN
const char*
dict_process_sys_stats_rec(
/*=============================*/
	mem_heap_t*	heap,		/*!< in/out: heap memory */
	const rec_t*	rec,		/*!< in: current SYS_STATS rec */
	index_id_t*	index_id,	/*!< out: INDEX_ID */
	ulint*		key_cols,	/*!< out: KEY_COLS */
	ib_uint64_t*	diff_vals,	/*!< out: DIFF_VALS */
	ib_uint64_t*	non_null_vals);	/*!< out: NON_NULL_VALS */
/********************************************************************//**
Check if dict_table_t::foreign_rbt and dict_table::foreign_list
contains the same set of foreign key objects; and check if
dict_table_t::referenced_rbt and dict_table::referenced_list contains
the same set of foreign key objects.
@return	TRUE if correct, FALSE otherwise. */
ibool
dict_table_check_foreign_keys(
/*==========================*/
	const dict_table_t*	table);	/* in: table object to check */

#ifndef UNIV_NONINL
#include "dict0load.ic"
#endif

#endif