function DatabaseSchema_mysql::addUniqueKey

Overrides DatabaseSchema::addUniqueKey

File

includes/database/mysql/schema.inc, line 425

Class

DatabaseSchema_mysql

Code

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