Escapes an alias name string.

Force all alias names to be strictly alphanumeric-plus-underscore. In contrast to DatabaseConnection::escapeField() / DatabaseConnection::escapeTable(), this doesn't allow the period (".") because that is not allowed in aliases.

Parameters

string $field: An unsanitized alias name.

Return value

string The sanitized alias name.

Overrides Connection::escapeAlias

File

core/lib/Drupal/Core/Database/Driver/mysql/Connection.php, line 481

Class

Connection

MySQL implementation of \Drupal\Core\Database\Connection.

Namespace

Drupal\Core\Database\Driver\mysql

Code

public function escapeAlias($field) {
  // Quote fields so that MySQL reserved words like 'function' can be used
  // as aliases.
  $field = parent::escapeAlias($field);
  return $this->quoteIdentifier($field);
}

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