Functions for easy reading of records, possible through a cache. More...

#include "records.h"
#include "sql_priv.h"
#include "sql_list.h"
#include "filesort.h"
#include "opt_range.h"
#include "sql_class.h"
#include "sql_select.h"

Functions
int	rr_sequential (READ_RECORD *info)
bool	init_read_record_idx (READ_RECORD info, THD thd, TABLE *table, bool print_error, uint idx, bool reverse)
bool	init_read_record (READ_RECORD info, THD thd, TABLE table, SQL_SELECT select, int use_record_cache, bool print_error, bool disable_rr_cache)
void	end_read_record (READ_RECORD *info)
void	rr_unlock_row (st_join_table *tab)

Detailed Description

Functions for easy reading of records, possible through a cache.

Function Documentation

bool init_read_record_idx	(	READ_RECORD *	info,
		THD *	thd,
		TABLE *	table,
		bool	print_error,
		uint	idx,
		bool	reverse
	)

Initialize READ_RECORD structure to perform full index scan in desired direction using read_record.read_record() interface

This function has been added at late stage and is used only by UPDATE/DELETE. Other statements perform index scans using join_read_first/next functions.

Parameters:

info	READ_RECORD structure to initialize.
thd	Thread handle
table	Table to be accessed
print_error	If true, call table->file->print_error() if an error occurs (except for end-of-records error)
idx	index to scan
reverse	Scan in the reverse direction

Return values:

true	error
false	success

void rr_unlock_row ( st_join_table * tab )

The default implementation of unlock-row method of READ_RECORD, used in all access methods.