protected function _getQuotedSchema($schema = null)
    {
        if ($schema === null) {
            return null;
        }
        return $this->_adapter->quoteIdentifier($schema, true) . '.';
    }
protected function _getQuotedSchema($schema = null)
    {
        if ($schema === null) {
            return null;
        }
        return $this->_adapter->quoteIdentifier($schema, true) . '.';
    }
protected function _getQuotedSchema ( $ schema = null ) { if ( $ schema === null ) { return null ; } return $ this -> _adapter -> quoteIdentifier ( $ schema , true ) . '.' ; }
Return a quoted schema name

@param string   $schema  The schema name OPTIONAL
@return string|null
Return a quoted schema name