MySQL 8.4.3
Source Code Documentation
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@session.dbug and @global.dbug variables. More...
#include <sys_vars.h>
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=nullptr, enum binlog_status_enum binlog_status_arg=VARIABLE_NOT_IN_BINLOG, on_check_function on_check_func=nullptr, on_update_function on_update_func=nullptr, const char *substitute=nullptr, int parse_flag=PARSE_NORMAL) | |
bool | do_check (THD *thd, set_var *var) override |
bool | session_update (THD *, set_var *var) override |
bool | global_update (THD *, set_var *var) override |
void | session_save_default (THD *, set_var *) override |
save the session default value of the variable in var More... | |
void | global_save_default (THD *, set_var *var) override |
save the global default value of the variable in var More... | |
void | saved_value_to_string (THD *, set_var *var, char *def_val) override |
This function converts value stored in save_result to string. More... | |
const uchar * | session_value_ptr (THD *running_thd, THD *, std::string_view) override |
A pointer to a value of the variable for SHOW. More... | |
const uchar * | global_value_ptr (THD *thd, std::string_view) override |
bool | check_update_type (Item_result type) override |
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, sys_var *persisted_alias=nullptr, bool is_persisted_deprecated=false) | |
sys_var constructor More... | |
virtual | ~sys_var ()=default |
const char * | get_deprecation_substitute () |
virtual void | cleanup () |
All the cleanup procedures should be performed here. More... | |
virtual sys_var_pluginvar * | cast_pluginvar () |
downcast for sys_var_pluginvar. More... | |
bool | check (THD *thd, set_var *var) |
const uchar * | value_ptr (THD *running_thd, THD *target_thd, enum_var_type type, std::string_view keycache_name) |
const uchar * | value_ptr (THD *thd, enum_var_type type, std::string_view keycache_name) |
virtual void | update_default (longlong new_def_value) |
virtual longlong | get_default () |
virtual longlong | get_min_value () |
virtual ulonglong | get_max_value () |
virtual ulong | get_var_type () |
Returns variable type. More... | |
virtual void | set_arg_source (get_opt_arg_source *) |
virtual void | set_is_plugin (bool) |
virtual enum_variable_source | get_source () |
virtual const char * | get_source_name () |
virtual void | set_source (enum_variable_source src) |
virtual bool | set_source_name (const char *path) |
virtual bool | set_user (const char *usr) |
virtual const char * | get_user () |
virtual const char * | get_host () |
virtual bool | set_host (const char *hst) |
virtual ulonglong | get_timestamp () const |
virtual void | set_user_host (THD *thd) |
my_option * | get_option () |
virtual void | set_timestamp () |
virtual void | set_timestamp (ulonglong ts) |
virtual bool | is_non_persistent () |
bool | set_default (THD *thd, set_var *var) |
Update the system variable with the default value from either session or global scope. More... | |
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_trilevel () const |
bool | is_persist_readonly () const |
bool | is_parse_early () const |
bool | is_sensitive () const |
bool | is_hint_updateable () const |
Check if the variable can be set using SET_VAR hint. More... | |
bool | is_struct () |
the following is only true for keycache variables, that support the syntax @keycache_name.variable_name More... | |
bool | is_written_to_binlog (enum_var_type type) |
bool | check_scope (enum_var_type query_type) |
Return true for success if: Global query and variable scope is GLOBAL or SESSION, or Session query and variable scope is SESSION or ONLY_SESSION. More... | |
bool | is_global_persist (enum_var_type type) |
bool | is_settable_at_command_line () |
Return true if settable at the command line. More... | |
bool | register_option (std::vector< my_option > *array, int parse_flags) |
void | do_deprecated_warning (THD *thd) |
Item * | copy_value (THD *thd) |
Create item from system variable value. More... | |
void | save_default (THD *thd, set_var *var) |
bool | check_if_sensitive_in_context (THD *, bool suppress_errors=true) const |
Additional Inherited Members | |
Public Types inherited from sys_var | |
enum | flag_enum { GLOBAL = 0x0001 , SESSION = 0x0002 , ONLY_SESSION = 0x0004 , SCOPE_MASK = 0x03FF , READONLY = 0x0400 , ALLOCATED = 0x0800 , INVISIBLE = 0x1000 , TRI_LEVEL = 0x2000 , NOTPERSIST = 0x4000 , HINT_UPDATEABLE = 0x8000 , PERSIST_AS_READ_ONLY = 0x10000 , SENSITIVE = 0x20000 } |
enum | binlog_status_enum { VARIABLE_NOT_IN_BINLOG , SESSION_VARIABLE_IN_BINLOG } |
Enumeration type to indicate for a system variable whether it will be written to the binlog or not. More... | |
Public Attributes inherited from sys_var | |
sys_var * | next |
LEX_CSTRING | name |
sys_var * | m_persisted_alias |
If the variable has an alias in the persisted variables file, this should point to it. More... | |
bool | m_is_persisted_deprecated |
If m_persist_alias is set, and the current variable is deprecated and m_persist_alias is the recommended substitute, then this flag should be set to true. More... | |
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(* | pre_update_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) |
A pointer to a storage area of the variable, to the raw data. More... | |
uchar * | global_var_ptr () |
Protected Attributes inherited from sys_var | |
int | flags |
or'ed flag_enum values More... | |
int | m_parse_flag |
either PARSE_EARLY or PARSE_NORMAL. More... | |
const SHOW_TYPE | show_val_type |
what value_ptr() returns for sql_show.cc More... | |
my_option | option |
min, max, default values are stored here More... | |
PolyLock * | guard |
second lock that protects the variable More... | |
ptrdiff_t | offset |
offset to the value from global_system_variables More... | |
on_check_function | on_check |
pre_update_function | pre_update |
Pointer to function to be invoked before updating system variable (but after calling on_check hook), while we do not hold any locks yet. More... | |
on_update_function | on_update |
const char *const | deprecation_substitute |
bool | is_os_charset |
true if the value is in character_set_filesystem More... | |
struct get_opt_arg_source | source |
char | user [USERNAME_CHAR_LENGTH+1] |
char | host [HOSTNAME_LENGTH+1] |
ulonglong | timestamp |
@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.
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inline |
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inlineoverridevirtual |
Implements sys_var.
save the global default value of the variable in var
Implements sys_var.
Implements sys_var.
Reimplemented from sys_var.
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inlineoverridevirtual |
This function converts value stored in save_result to string.
This function must be called after calling save_default() as save_default() will store default value to save_result.
Implements sys_var.
save the session default value of the variable in var
Implements sys_var.
Implements sys_var.
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inlineoverridevirtual |
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.