set_var Class Reference

#include <set_var.h>

Inheritance diagram for set_var:

Collaboration diagram for set_var:

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 Member Functions inherited from set_var_base
virtual bool	is_var_optimizer_trace () const

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

Additional Inherited Members
Static Public Member Functions inherited from Sql_alloc
static void *	operator new (size_t size) throw ()
static void *	operator new[] (size_t size) throw ()
static void *	operator new[] (size_t size, MEM_ROOT *mem_root) throw ()
static void *	operator new (size_t size, MEM_ROOT *mem_root) throw ()
static void	operator delete (void *ptr, size_t size)
static void	operator delete (void *ptr, MEM_ROOT *mem_root)
static void	operator delete[] (void *ptr, MEM_ROOT *mem_root)
static void	operator delete[] (void *ptr, size_t size)

Detailed Description

set_var_base descendant for assignments to the system variables.

Definition at line 210 of file set_var.h.

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.

Definition at line 595 of file set_var.cc.

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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.

Definition at line 639 of file set_var.cc.

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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.

Definition at line 678 of file set_var.cc.

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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.

Definition at line 668 of file set_var.cc.

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Member Data Documentation

LEX_STRING set_var::base

for structured variables, like keycache_name.variable_name

Definition at line 225 of file set_var.h.

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

• sql/set_var.h
• sql/set_var.cc