protected function process( array $stmts )
	{
		$table = 'users_address';
		$this->msg( sprintf( 'Rename "refid" to "parentid" in table "%1$s"', $table ), 0 ); $this->status( '' );

		foreach( $stmts as $column => $stmts )
		{
			$this->msg( sprintf( 'Checking column "%1$s"', $column ), 1 );

			if( $this->schema->tableExists( $table )
				&& $this->schema->columnExists( $table, $column ) === true
			) {
				$this->executeList( $stmts );
				$this->status( 'done' );
			} else {
				$this->status( 'OK' );
			}
		}
	}