myrg_open.cc File Reference

#include <errno.h>
#include <fcntl.h>
#include <stddef.h>
#include <sys/types.h>
#include "my_dbug.h"
#include "my_inttypes.h"
#include "my_io.h"
#include "mysql/psi/mysql_file.h"
#include "storage/myisam/myisamdef.h"
#include "storage/myisammrg/myrg_def.h"
#include "typelib.h"

Functions
MYRG_INFO *	myrg_open (const char *name, int mode, int handle_locking)
MYRG_INFO *	myrg_parent_open (const char *parent_name, int(*callback)(void *, const char *), void *callback_param)
	Open parent table of a MyISAM MERGE table. More...
int	myrg_attach_children (MYRG_INFO *m_info, int handle_locking, MI_INFO *(*callback)(void *), void *callback_param, bool *need_compat_check)
	Attach children to a MyISAM MERGE parent table. More...
int	myrg_detach_children (MYRG_INFO *m_info)
	Detach children from a MyISAM MERGE parent table. More...

Function Documentation

myrg_attach_children()

int myrg_attach_children	(	MYRG_INFO *	m_info,
		int	handle_locking,
		MI_INFO *(*)(void *)	callback,
		void *	callback_param,
		bool *	need_compat_check
	)

Attach children to a MyISAM MERGE parent table.

Call a callback function for each child table. The callback returns the MyISAM table handle of the child table. Check table definition match.

Parameters

[in]	m_info	MERGE parent table structure
[in]	handle_locking	if contains HA_OPEN_FOR_REPAIR, warn about incompatible child tables, but continue
[in]	callback	function to call for each child table
[in]	callback_param	data pointer to give to the callback
[in]	need_compat_check	pointer to ha_myisammrg::need_compat_check (we need this one to decide if previously allocated buffers can be reused).

Returns

status

Return values

0	OK
!=	0 Error

Note

: Currently there is some code duplication between myrg_open() and myrg_parent_open() + myrg_attach_children(). Please duplicate changes in these functions or make common sub-functions.

myrg_detach_children()

int myrg_detach_children

(

MYRG_INFO *

m_info

)

Detach children from a MyISAM MERGE parent table.

Parameters

[in]

m_info

MERGE parent table structure

Note

Detach must not touch the children in any way. They may have been closed at this point already. All references to the children should be removed.

Returns

status

Return values

0

OK

myrg_open()

MYRG_INFO * myrg_open	(	const char *	name,
		int	mode,
		int	handle_locking
	)

myrg_parent_open()

MYRG_INFO * myrg_parent_open	(	const char *	parent_name,
		int(*)(void *, const char *)	callback,
		void *	callback_param
	)

Open parent table of a MyISAM MERGE table.

Open MERGE meta file to get the table name paths for the child tables. Count the children. Allocate and initialize MYRG_INFO structure. Call a callback function for each child table.

Parameters

[in]	parent_name	merge table name path as "database/table"
[in]	callback	function to call for each child table
[in]	callback_param	data pointer to give to the callback

Returns

MYRG_INFO pointer

Return values

!=	NULL OK
NULL	Error

Note

Currently there is some code duplication between myrg_open() and myrg_parent_open() + myrg_attach_children(). Please duplicate changes in these functions or make common sub-functions.