s_mysql_mysql_system_variable_update_default Struct Reference

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

#include <mysql_system_variable.h>

Public Attributes
mysql_service_status_t(*	set )(MYSQL_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;
if ((base != 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) (MYSQL_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