protected function _process( array $stmts )
	{
		$table = 'mshop_plugin';
		$constraint = 'fk_msplu_typeid';

		$this->_msg( 'Adding constraint for table mshop_plugin', 0 ); $this->_status( '' );

		$this->_msg( sprintf( 'Checking constraint "%1$s": ', $constraint ), 1 );

		if( $this->_schema->tableExists( $table ) === true
			&& $this->_schema->columnExists( $table, 'typeid' )
			&& $this->_schema->constraintExists( $table, $constraint ) === false )
		{
			$this->_execute( $stmts[ $constraint ] );
			$this->_status( 'added' );
		}
		else
		{
			$this->_status( 'OK' );
		}
	}