backend.hpp

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/* LiteSQL 
 * 
 * The list of contributors at http://litesql.sf.net/ 
 * 
 * See LICENSE for copyright information. */

#ifndef litesql_backend_hpp
#define litesql_backend_hpp
#include <memory>
#include "litesql/types.hpp"
namespace litesql {
    using namespace std;


    class Backend {
        public:
            class Cursor {
                public:
                    virtual ~Cursor() {}
                    virtual void setCacheSize(int s) {}
                    virtual Record fetchOne()=0;  
            };
            class Result {
                public:
                    virtual ~Result() {}
                    virtual size_t fieldNum() const=0;
                    virtual Record fields() const=0;
                    virtual size_t recordNum() const=0;
                    virtual Records records() const=0;

            };
            virtual ~Backend() {}
            virtual bool supportsSequences() const {
                return false;
            }
            virtual string getRowIDType() const {
                return "INTEGER PRIMARY KEY";
            }
            virtual string getInsertID() const { return ""; }
            virtual void begin() const {}
            virtual void commit() const {}
            virtual void rollback() const {}
            virtual Result* execute(const string& query) const = 0;
            virtual Cursor* cursor(const string& query) const = 0;
            virtual string groupInsert(Record tables, Records fields, Records values,
                    const string& sequence) const;
    static Backend* getBackend(const string& type,const string& connInfo);
      
    };
}

#endif