public function DatabaseConnection_mysql::nextIdDelete in Drupal 7

1 call to DatabaseConnection_mysql::nextIdDelete()

DatabaseConnection_mysql::__destruct in includes/database/mysql/database.inc

File

includes/database/mysql/database.inc, line 501

Database interface code for MySQL database servers.

Class

DatabaseConnection_mysql

Code

public function nextIdDelete() {

  // While we want to clean up the table to keep it up from occupying too
  // much storage and memory, we must keep the highest value in the table
  // because InnoDB  uses an in-memory auto-increment counter as long as the
  // server runs. When the server is stopped and restarted, InnoDB
  // reinitializes the counter for each table for the first INSERT to the
  // table based solely on values from the table so deleting all values would
  // be a problem in this case. Also, TRUNCATE resets the auto increment
  // counter.
  try {
    $max_id = $this
      ->query('SELECT MAX(value) FROM {sequences}')
      ->fetchField();

    // We know we are using MySQL here, no need for the slower db_delete().
    $this
      ->query('DELETE FROM {sequences} WHERE value < :value', array(
      ':value' => $max_id,
    ));
  } catch (PDOException $e) {
  }
}