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My Project
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My Project
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#include <set_var.h>
Public Types | |
| 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 Member Functions | |
| 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) |
| virtual bool | check_update_type (Item_result type)=0 |
| bool | check_type (enum_var_type type) |
| bool | register_option (std::vector< my_option > *array, int parse_flags) |
| void | do_deprecated_warning (THD *thd) |
Public Attributes | |
| sys_var * | next |
| LEX_CSTRING | name |
| enum sys_var::binlog_status_enum | binlog_status |
Static Public Attributes | |
| static const int | PARSE_EARLY = 1 |
| static const int | PARSE_NORMAL = 2 |
Protected Types | |
| 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 | |
| virtual uchar * | session_value_ptr (THD *thd, LEX_STRING *base) |
| virtual uchar * | global_value_ptr (THD *thd, LEX_STRING *base) |
| uchar * | session_var_ptr (THD *thd) |
| uchar * | global_var_ptr () |
Protected Attributes | |
| 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 | |
A class representing one system variable - that is something that can be accessed as @global.variable_name or @session.variable_name, visible in SHOW xxx VARIABLES and in INFORMATION_SCHEMA.xxx_VARIABLES, optionally it can be assigned to, optionally it can have a command-line counterpart with the same name.
Enumeration type to indicate for a system variable whether it will be written to the binlog or not.
| sys_var::sys_var | ( | sys_var_chain * | chain, |
| const char * | name_arg, | ||
| const char * | comment, | ||
| int | flags_arg, | ||
| 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 constructor
| chain | variables are linked into chain for mysql_add_sys_var_chain() |
| name_arg | the name of the variable. Must be 0-terminated and exist for the liftime of the sys_var object. |
| comment | shown in mysqld --help, |
| flags_arg | or'ed flag_enum values |
| off | offset of the global variable value from the &global_system_variables. |
| getopt_id | -1 for no command-line option, otherwise |
| getopt_arg_type |
| show_val_type_arg | what value_ptr() returns for sql_show.cc |
| def_val | default value, |
| lock | mutex or rw_lock that protects the global variable in addition* to LOCK_global_system_variables. |
| binlog_status_enum |
| on_check_func | a function to be called at the end of sys_var::check, put your additional checks here |
| on_update_func | a function to be called at the end of sys_var::update, any post-update activity should happen here |
| substitute | If non-NULL, this variable is deprecated and the string describes what one should use instead. If an empty string, the variable is deprecated but no replacement is offered. |
| parse_flag | either PARSE_EARLY or PARSE_NORMAL |
| virtual sys_var_pluginvar* sys_var::cast_pluginvar | ( | ) | [inline, virtual] |
downcast for sys_var_pluginvar. Returns this if it's an instance of sys_var_pluginvar, and 0 otherwise.
Reimplemented in sys_var_pluginvar.
| virtual void sys_var::cleanup | ( | ) | [inline, virtual] |
All the cleanup procedures should be performed here
Reimplemented in Sys_var_charptr.
| bool sys_var::is_struct | ( | ) | [inline] |
the following is only true for keycache variables, that support the syntax @keycache_name.variable_name
| uchar * sys_var::session_value_ptr | ( | THD * | thd, |
| LEX_STRING * | base | ||
| ) | [protected, virtual] |
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 in Sys_var_gtid_owned, Sys_var_gtid_purged, Sys_var_gtid_executed, Sys_var_charptr_func, Sys_var_gtid_specification, Sys_var_tz, Sys_var_struct, Sys_var_have, Sys_var_session_special_double, Sys_var_session_special, Sys_var_bit, Sys_var_plugin, Sys_var_set, Sys_var_flagset, Sys_var_max_user_conn, Sys_var_dbug, Sys_var_external_user, Sys_var_proxy_user, Sys_var_enum, and sys_var_pluginvar.
| uchar* sys_var::session_var_ptr | ( | THD * | thd | ) | [inline, protected] |
A pointer to a storage area of the variable, to the raw data. Typically it's the same as session_value_ptr(), but it's different, for example, for ENUM, that is printed as a string, but stored as a number.
| bool sys_var::set_default | ( | THD * | thd, |
| set_var * | var | ||
| ) |
Update the system variable with the default value from either session or global scope. The default value is stored in the 'var' argument. Return false when successful.
1.7.6.1
