QueryEngine.h

Go to the documentation of this file.

/*
 * QueryEngine.h
 *
 *  Created on: May 3, 2010
 *      Author: green
 */

#ifndef QUERYENGINE_H_
#define QUERYENGINE_H_

#include "Common.h"
#include "IQueryOperator.h"
#include "IScanOperator.h"
#include "RecordFileScan.h"
#include "SystemManager.h"

class QueryEngine {
public:
        static QueryEngine* getInstance();

        ReturnCode select(int nAttributes, const RelationAttribute attributes[],
                                      int nRelations, const char* relations[],
                                      int nConditions, const Condition conditions[]);

        ReturnCode insert(const char* relName, int nValues, 
                                          const TypedValue values[]);

        ReturnCode remove(const char* relName, int nConditions,
                        const Condition conditions[]);

        ReturnCode update(const char* relName, const RelationAttribute* left,
                                          const AttributeOrValue* right, int nConditions, 
                                          const Condition conditions[]);

        
private:
        // BEGIN private methods and data related to sample implementation of
        // QueryEngine::select; you may use these, change them, or delete them as
        // you like.
        
        ReturnCode buildFileScanNode(const char* relation, IScanOperator** scan);

        ReturnCode buildProjectNode(IQueryOperator* child, int nAttributes,
                                                                const RelationAttribute attributes[],
                                                                IQueryOperator** project);
        
        ReturnCode buildExecutionPlan(int nAttributes, const RelationAttribute attributes[],
                                                                  int nRelations, const char* relations[],
                                                                  int nConditions, const Condition conditions[],
                                                                  IQueryOperator** root);

        uint getRecordSize(int nAttributes, const RelationAttributeInfo attributes[]);
        
        ReturnCode executePlan(IQueryOperator* root);

        SystemManager* sm_;
        RecordFileManager* rm_;

        // END private methods and data related to sample implementation of QueryEngine::select

        QueryEngine();
        ~QueryEngine();
};

#endif /* QUERYENGINE_H_ */

---