function DatabaseSchema_pgsql::addUniqueKey

Add a unique key.

Parameters

$table: The table to be altered.

$name: The name of the key.

$fields: An array of field names.

Overrides DatabaseSchema::addUniqueKey

File

includes/database/pgsql/schema.inc, line 663

Class

DatabaseSchema_pgsql

Code

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->constraintExists($table, $name . '_key')) {
        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 CONSTRAINT "' . $this->ensureIdentifiersLength($table, $name, 'key') . '" UNIQUE (' . implode(',', $fields) . ')');
}