public function Tasks::initializeDatabase in Drupal 8

Same name and namespace in other branches

1. 9 core/lib/Drupal/Core/Database/Driver/pgsql/Install/Tasks.php \Drupal\Core\Database\Driver\pgsql\Install\Tasks::initializeDatabase()

Make PostgreSQL Drupal friendly.

File

core/lib/Drupal/Core/Database/Driver/pgsql/Install/Tasks.php, line 239

Class

Tasks

Specifies installation tasks for PostgreSQL databases.

Namespace

Drupal\Core\Database\Driver\pgsql\Install

Code

public function initializeDatabase() {

  // We create some functions using global names instead of prefixing them
  // like we do with table names. This is so that we don't double up if more
  // than one instance of Drupal is running on a single database. We therefore
  // avoid trying to create them again in that case.
  // At the same time checking for the existence of the function fixes
  // concurrency issues, when both try to update at the same time.
  try {
    $connection = Database::getConnection();

    // When testing, two installs might try to run the CREATE FUNCTION queries
    // at the same time. Do not let that happen.
    $connection
      ->query('SELECT pg_advisory_lock(1)');

    // Don't use {} around pg_proc table.
    if (!$connection
      ->query("SELECT COUNT(*) FROM pg_proc WHERE proname = 'rand'")
      ->fetchField()) {
      $connection
        ->query('CREATE OR REPLACE FUNCTION "rand"() RETURNS float AS
          \'SELECT random();\'
          LANGUAGE \'sql\'', [], [
        'allow_delimiter_in_query' => TRUE,
      ]);
    }
    if (!$connection
      ->query("SELECT COUNT(*) FROM pg_proc WHERE proname = 'substring_index'")
      ->fetchField()) {
      $connection
        ->query('CREATE OR REPLACE FUNCTION "substring_index"(text, text, integer) RETURNS text AS
          \'SELECT array_to_string((string_to_array($1, $2)) [1:$3], $2);\'
          LANGUAGE \'sql\'', [], [
        'allow_delimiter_in_query' => TRUE,
      ]);
    }
    $connection
      ->query('SELECT pg_advisory_unlock(1)');
    $this
      ->pass(t('PostgreSQL has initialized itself.'));
  } catch (\Exception $e) {
    $this
      ->fail(t('Drupal could not be correctly setup with the existing database due to the following error: @error.', [
      '@error' => $e
        ->getMessage(),
    ]));
  }
}