Sys_var_dbug Class Reference

#include <sys_vars.h>

Inheritance diagram for Sys_var_dbug:

Collaboration diagram for Sys_var_dbug:

Public Member Functions
	Sys_var_dbug (const char *name_arg, const char *comment, int flag_args, CMD_LINE getopt, const char *def_val, 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)
Public Member Functions inherited from sys_var
	sys_var (sys_var_chain *chain, const char *name_arg, const char *comment, int flag_args, ptrdiff_t off, int getopt_id, enum get_opt_arg_type getopt_arg_type, SHOW_TYPE show_val_type_arg, longlong def_val, PolyLock *lock, enum binlog_status_enum binlog_status_arg, on_check_function on_check_func, on_update_function on_update_func, const char *substitute, int parse_flag)
virtual void	cleanup ()
virtual sys_var_pluginvar *	cast_pluginvar ()
bool	check (THD *thd, set_var *var)
uchar *	value_ptr (THD *thd, enum_var_type type, LEX_STRING *base)
virtual void	update_default (longlong new_def_value)
bool	set_default (THD *thd, set_var *var)
bool	update (THD *thd, set_var *var)
SHOW_TYPE	show_type ()
int	scope () const
const CHARSET_INFO *	charset (THD *thd)
bool	is_readonly () const
bool	not_visible () const
bool	is_struct ()
bool	is_written_to_binlog (enum_var_type type)
bool	check_type (enum_var_type type)
bool	register_option (std::vector< my_option > *array, int parse_flags)
void	do_deprecated_warning (THD *thd)

Additional Inherited Members
Public Types inherited from sys_var
enum	flag_enum {   GLOBAL, SESSION, ONLY_SESSION, SCOPE_MASK = 1023,   READONLY = 1024, ALLOCATED = 2048, INVISIBLE = 4096 }
enum	binlog_status_enum { VARIABLE_NOT_IN_BINLOG, SESSION_VARIABLE_IN_BINLOG }
Public Attributes inherited from sys_var
sys_var *	next
LEX_CSTRING	name
enum sys_var::binlog_status_enum	binlog_status
Static Public Attributes inherited from sys_var
static const int	PARSE_EARLY = 1
static const int	PARSE_NORMAL = 2
Protected Types inherited from sys_var
typedef bool(*	on_check_function )(sys_var *self, THD *thd, set_var *var)
typedef bool(*	on_update_function )(sys_var *self, THD *thd, enum_var_type type)
Protected Member Functions inherited from sys_var
uchar *	session_var_ptr (THD *thd)
uchar *	global_var_ptr ()
Protected Attributes inherited from sys_var
int	flags
	or'ed flag_enum values
int	m_parse_flag
	either PARSE_EARLY or PARSE_NORMAL.
const SHOW_TYPE	show_val_type
	what value_ptr() returns for sql_show.cc
my_option	option
	min, max, default values are stored here
PolyLock *	guard
	second lock that protects the variable
ptrdiff_t	offset
	offset to the value from global_system_variables
on_check_function	on_check
on_update_function	on_update
const char *const	deprecation_substitute
bool	is_os_charset
	true if the value is in character_set_filesystem

Detailed Description

@session.dbug and @global.dbug variables.

@dbug variable differs from other variables in one aspect: if its value is not assigned in the session, it "points" to the global value, and so when the global value is changed, the change immediately takes effect in the session.

This semantics is intentional, to be able to debug one session from another.

Definition at line 637 of file sys_vars.h.

Member Function Documentation

void Sys_var_dbug::global_save_default ( THD *  thd, set_var *  var  )

inlinevirtual

save the global default value of the variable in var

Implements sys_var.

Definition at line 682 of file sys_vars.h.

void Sys_var_dbug::session_save_default ( THD *  thd, set_var *  var  )

inlinevirtual

save the session default value of the variable in var

Implements sys_var.

Definition at line 680 of file sys_vars.h.

uchar* Sys_var_dbug::session_value_ptr ( THD *  thd, LEX_STRING *  base  )

inlinevirtual

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.

Definition at line 687 of file sys_vars.h.

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

• sql/sys_vars.h