protected function Schema::ensureIdentifiersLength

protected Schema::ensureIdentifiersLength($identifier)

Make sure to limit identifiers according to PostgreSQL compiled in length.

PostgreSQL allows in standard configuration no longer identifiers than 63 chars for table/relation names, indexes, primary keys, and constraints. So we map all identifiers that are too long to drupal_base64hash_tag, where tag is one of:

• idx for indexes
• key for constraints
• pkey for primary keys

Parameters

$identifiers: The arguments to build the identifier string

Return value

The index/constraint/pkey identifier

File

core/lib/Drupal/Core/Database/Driver/pgsql/Schema.php, line 57

Class

Schema

PostgreSQL implementation of \Drupal\Core\Database\Schema.

Namespace

Drupal\Core\Database\Driver\pgsql

Code

protected function ensureIdentifiersLength($identifier) {
  $args = func_get_args();
  $info = $this->getPrefixInfo($identifier);
  $args[0] = $info['table'];
  $identifierName = implode('__', $args);

  // Retrieve the max identifier length which is usually 63 characters
  // but can be altered before PostgreSQL is compiled so we need to check.
  $this->maxIdentifierLength = $this->connection->query("SHOW max_identifier_length")->fetchField();

  if (strlen($identifierName) > $this->maxIdentifierLength) {
    $saveIdentifier = '"drupal_' . $this->hashBase64($identifierName) . '_' . $args[2] . '"';
  }
  else {
    $saveIdentifier = $identifierName;
  }
  return $saveIdentifier;
}