protected function _process( array $stmts )
	{
		$this->_msg( 'Change order siteid foreign key constraints', 0 ); $this->_status( '' );

		foreach( $stmts as $table => $stmtList )
		{
			foreach ( $stmtList as $constraint => $stmts )
			{
				$this->_msg( sprintf( 'Checking constraint "%1$s": ', $constraint ), 1 );

				if( $this->_schema->tableExists( $table )
					&& $this->_schema->getColumnDetails( $table, 'siteid' )->isNullable() === false )
				{
					$this->_execute( $stmts['column'] );

					if( $this->_schema->constraintExists( $table, $constraint ) === true ) {
						$this->_execute( $stmts['drop'] );
					}

					$this->_status( 'changed' );
				}
				else
				{
					$this->_status( 'OK' );
				}
			}
		}
	}