Service to set the default value of system variables. More...

#include <mysql_system_variable.h>

Public Attributes
mysql_service_status_t(*	set )(THD thd, const char variable_type, my_h_string variable_base, my_h_string variable_name)
	Sets the value of a system variable to its default value. More...

Detailed Description

Service to set the default value of system variables.

This is an example of using the service:

MYSQL_THD thd = nullptr;
 
if (!make_new_thread &&
    mysql_service_mysql_current_thread_reader->get(&thd)) {
  *error = 1;
  return 0;
}
 
const char *cs = "latin1";
const char *base_input = "my_component"; //nullptr if not a component variable
const char *name_input = "my_variable";
const char *type = "PERSIST";
 
my_h_string base = nullptr, name = nullptr;
 
mysql_service_mysql_string_factory->create(&base);
mysql_service_mysql_string_factory->create(&name);
 
if ((base_input != nullptr &&
     mysql_service_mysql_string_converter->convert_from_buffer(
        &base, base_input, strlen(base_input), cs)) ||
    mysql_service_mysql_string_converter->convert_from_buffer(
        &name, name_input, strlen(name_input), cs)) {
  if (base) mysql_service_mysql_string_factory->destroy(base);
  if (name) mysql_service_mysql_string_factory->destroy(name);
  *error = 1;
  return 0;
}
 
if (mysql_service_mysql_system_variable_update_default->set(
       thd, type, base, name))
  *error = 1;
 
if (base) mysql_service_mysql_string_factory->destroy(base);
if (name) mysql_service_mysql_string_factory->destroy(name);

See also: mysql_system_variable_update_imp

Member Data Documentation

◆ set

mysql_service_status_t(* s_mysql_mysql_system_variable_update_default::set) (THD *thd, const char *variable_type, my_h_string variable_base, my_h_string variable_name)

Sets the value of a system variable to its default value.

See also: Component Services Inventory

Parameters

thd	thread session handle. if NULL a temp one will be created and then removed.
variable_type	One of GLOBAL, SESSION, PERSIST, PERSIST_ONLY. If NULL, then assumes GLOBAL. SESSION is not supported for a temporary THD.
variable_base	a mysql string of the variable name prefix. NULL if none
variable_name	MySQL string of the variable name

Return values

FALSE	success
TRUE	failure, error set. For error info, see THD if supplied.

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

include/mysql/components/services/mysql_system_variable.h

Public Attributes

Detailed Description

Member Data Documentation

◆ set