Configuration Settings Functions

Configuration setting functions are used for querying and modifying configuration parameters during running.

• current_setting(setting_name)

  Description: Specifies the current setting.

  Return type: text

  Note:current_setting obtains the current setting of setting_name by query. It is equivalent to the SHOW statement.

  Example:

  MogDB=# SELECT current_setting('datestyle');
  
   current_setting
  -----------------
   ISO, MDY
  (1 row)

• set_working_grand_version_num_manually(tmp_version)

  Description: Upgrades new features of the database by switching the authorization version.

  Return type: void

• shell_in(type)

  Description: Inputs a route for the shell type that has not yet been filled.

  Return type: void

• shell_out(type)

  Description: Outputs a route for the shell type that has not yet been filled.

  Return type: void

• set_config(setting_name, new_value, is_local)

  Description: Sets the parameter and returns a new value.

  Return type: text

  Note: set_config sets setting_name to new_value. If is_local is set to true, new_value applies only to the current transaction. If you want new_value to apply for the current session, set the value to false instead. The function corresponds to the SET statement.

  Example:

  MogDB=# SELECT set_config('log_statement_stats', 'off', false);
  
   set_config
  ------------
   off
  (1 row)