set_var Class Reference

#include <set_var.h>

Inheritance diagram for set_var:

List of all members.

Public Member Functions
	set_var (enum_var_type type_arg, sys_var *var_arg, const LEX_STRING *base_name_arg, Item *value_arg)
int	check (THD *thd)
int	update (THD *thd)
int	light_check (THD *thd)
void	print (THD *thd, String *str)
Public Attributes
sys_var *	var
	system variable to be updated
Item *	value
	the expression that provides the new value of the variable
enum_var_type	type
union {
ulonglong   ulonglong_value
	for all integer, set, enum sysvars
double   double_value
	for Sys_var_double
plugin_ref   plugin
	for Sys_var_plugin
Time_zone *   time_zone
	for Sys_var_tz
LEX_STRING   string_value
	for Sys_var_charptr and others
const void *   ptr
	for Sys_var_struct
}	save_result
LEX_STRING	base

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Detailed Description

set_var_base descendant for assignments to the system variables.

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Member Function Documentation

int set_var::check

(

THD *

thd

)

[virtual]

Verify that the supplied value is correct.

Parameters:

thd	Thread handler

Returns:

status code

Return values:

-1	Failure
0	Success

Implements set_var_base.

int set_var::light_check

(

THD *

thd

)

[virtual]

Check variable, but without assigning value (used by PS).

Parameters:

thd	thread handler

Return values:

0	ok
1	ERROR, message sent (normally no variables was updated)
-1	ERROR, message not sent

Reimplemented from set_var_base.

void set_var::print	(	THD *	thd,
		String *	str
	)		[virtual]

Self-print assignment

Parameters:

str	string buffer to append the partial assignment to

Implements set_var_base.

int set_var::update

(

THD *

thd

)

[virtual]

Update variable

Parameters:

thd	thread handler

Returns:

0|1 ok or ERROR

Note:

ERROR can be only due to abnormal operations involving the server's execution evironment such as out of memory, hard disk failure or the computer blows up. Consider set_var::check() method if there is a need to return an error due to logics.

Implements set_var_base.

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Member Data Documentation

LEX_STRING set_var::base

for structured variables, like keycache_name.variable_name

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

• set_var.h
• set_var.cc