public function DatabaseSchema_mysql::addPrimaryKey

Add a primary key.

Parameters

$table: The table to be altered.

$fields: Fields for the primary key.

Throws

DatabaseSchemaObjectDoesNotExistException If the specified table doesn't exist.

DatabaseSchemaObjectExistsException If the specified table already has a primary key.

Overrides DatabaseSchema::addPrimaryKey

File

drupal/includes/database/mysql/schema.inc, line 400

Database schema code for MySQL database servers.

Class

DatabaseSchema_mysql

Code

public function addPrimaryKey($table, $fields) {
  if (!$this
    ->tableExists($table)) {
    throw new DatabaseSchemaObjectDoesNotExistException(t("Cannot add primary key to table @table: table doesn't exist.", array(
      '@table' => $table,
    )));
  }
  if ($this
    ->indexExists($table, 'PRIMARY')) {
    throw new DatabaseSchemaObjectExistsException(t("Cannot add primary key to table @table: primary key already exists.", array(
      '@table' => $table,
    )));
  }
  $this->connection
    ->query('ALTER TABLE {' . $table . '} ADD PRIMARY KEY (' . $this
    ->createKeySql($fields) . ')');
}