set_var Class Reference

set_var_base descendant for assignments to the system variables. More...

#include <set_var.h>

Inheritance diagram for set_var:

Public Member Functions
	set_var (enum_var_type type_arg, const System_variable_tracker &var_arg, Item *value_arg)
int	resolve (THD *thd) override
	Resolve the variable assignment. More...
int	check (THD *thd) override
	Verify that the supplied value is correct. More...
int	update (THD *thd) override
	Update variable. More...
int	light_check (THD *thd) override
	Check variable, but without assigning value (used by PS). More...
void	print_short (const THD *thd, String *str)
	Print variable in short form. More...
bool	print (const THD *, String *str) override
	Self-print assignment. More...
bool	is_global_persist ()
bool	is_var_optimizer_trace () const override
bool	is_sensitive () const override
	Check if system variable is of type SENSITIVE. More...
void	update_source_user_host_timestamp (THD *thd, sys_var *var)
	Update variable source, user, host and timestamp values. More...
Public Member Functions inherited from set_var_base
	set_var_base ()=default
virtual	~set_var_base ()=default
virtual void	cleanup ()

Public Attributes
Item *	value
	the expression that provides the new value of the variable More...
const enum_var_type	type
union {
ulonglong   ulonglong_value
	for all integer, set, enum sysvars More...
double   double_value
	for Sys_var_double More...
plugin_ref   plugin
	for Sys_var_plugin More...
Time_zone *   time_zone
	for Sys_var_tz More...
LEX_STRING   string_value
	for Sys_var_charptr and others More...
const void *   ptr
	for Sys_var_struct More...
}	save_result
	Resolver of the variable at the left hand side of the assignment. More...
const System_variable_tracker	m_var_tracker

Detailed Description

set_var_base descendant for assignments to the system variables.

Constructor & Destructor Documentation

set_var()

set_var::set_var ( enum_var_type  type_arg, const System_variable_tracker &  var_arg, Item *  value_arg  )

inline

Member Function Documentation

check()

int set_var::check ( THD *  thd )

overridevirtual

Verify that the supplied value is correct.

Parameters

thd	Thread handler

Returns

status code

Return values

-1	Failure
0	Success

Implements set_var_base.

is_global_persist()

bool set_var::is_global_persist ( )

inline

is_sensitive()

bool set_var::is_sensitive ( ) const

overridevirtual

Check if system variable is of type SENSITIVE.

Returns

If variable is sensitive or not

Reimplemented from set_var_base.

is_var_optimizer_trace()

bool set_var::is_var_optimizer_trace ( ) const

inlineoverridevirtual

Returns

whether this variable is @@optimizer_trace.

Reimplemented from set_var_base.

light_check()

int set_var::light_check ( THD *  thd )

overridevirtual

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.

print()

bool set_var::print ( const THD *  thd, String *  str  )

overridevirtual

Self-print assignment.

Parameters

thd	Thread handle
str	String buffer to append the partial assignment to.

Returns

status of rewritten

Implements set_var_base.

print_short()

void set_var::print_short	(	const THD *	thd,
		String *	str
	)

Print variable in short form.

Parameters

thd	Thread handle.
str	String buffer to append the partial assignment to.

resolve()

int set_var::resolve ( THD *  thd )

overridevirtual

Resolve the variable assignment.

Parameters

thd	Thread handler

Returns

status code

Return values

-1	Failure
0	Success

Implements set_var_base.

update()

int set_var::update ( THD *  thd )

overridevirtual

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 environment 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.

update_source_user_host_timestamp()

void set_var::update_source_user_host_timestamp	(	THD *	thd,
		sys_var *	var
	)

Update variable source, user, host and timestamp values.

Member Data Documentation

double_value

double set_var::double_value

for Sys_var_double

m_var_tracker

const System_variable_tracker set_var::m_var_tracker

plugin

plugin_ref set_var::plugin

for Sys_var_plugin

ptr

const void* set_var::ptr

for Sys_var_struct

union { ... } set_var::save_result

Resolver of the variable at the left hand side of the assignment.

string_value

LEX_STRING set_var::string_value

for Sys_var_charptr and others

time_zone

Time_zone* set_var::time_zone

for Sys_var_tz

type

const enum_var_type set_var::type

ulonglong_value

ulonglong set_var::ulonglong_value

for all integer, set, enum sysvars

value

Item* set_var::value

the expression that provides the new value of the variable

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

• sql/set_var.h
• sql/set_var.cc