#include <sys_vars.h>

Inheritance diagram for Sys_var_have:

Public Member Functions
	Sys_var_have (const char name_arg, const char comment, int flag_args, ptrdiff_t off, size_t size, CMD_LINE getopt, PolyLock lock=0, enum binlog_status_enum binlog_status_arg=VARIABLE_NOT_IN_BINLOG, on_check_function on_check_func=0, on_update_function on_update_func=0, const char substitute=0, int parse_flag=PARSE_NORMAL)
bool	do_check (THD thd, set_var var)
bool	session_update (THD thd, set_var var)
bool	global_update (THD thd, set_var var)
void	session_save_default (THD thd, set_var var)
void	global_save_default (THD thd, set_var var)
uchar *	session_value_ptr (THD thd, LEX_STRING base)
uchar *	global_value_ptr (THD thd, LEX_STRING base)
bool	check_update_type (Item_result type)

Detailed Description

The class for read-only variables that show whether a particular feature is supported by the server. Example: have_compression

Backing store: enum SHOW_COMP_OPTION

Note:: These variables are necessarily read-only, only global, and have no command-line equivalent.

Member Function Documentation

void Sys_var_have::global_save_default	(	THD *	thd,
		set_var *	var
	)		`[inline, virtual]`

save the global default value of the variable in var

Implements sys_var.

void Sys_var_have::session_save_default	(	THD *	thd,
		set_var *	var
	)		`[inline, virtual]`

save the session default value of the variable in var

Implements sys_var.

uchar* Sys_var_have::session_value_ptr	(	THD *	thd,
		LEX_STRING *	base
	)		`[inline, virtual]`

A pointer to a value of the variable for SHOW. It must be of show_val_type type (bool for SHOW_BOOL, int for SHOW_INT, longlong for SHOW_LONGLONG, etc).

Reimplemented from sys_var.

The documentation for this class was generated from the following file:

sys_vars.h

Public Member Functions

Detailed Description

Member Function Documentation