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"
#include "litesql/commontypes.h"
 
namespace litesql {
 
    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 std::string getSQLType(AT_field_type fieldType, const std::string& length="") const;
            virtual std::string getCreateSequenceSQL(const std::string& name) const;
            virtual std::string getSeqSQL(const std::string& sname) const;
 
            virtual std::string getRowIDType() const {
                return "INTEGER PRIMARY KEY";
            }
      
            virtual std::string getInsertID() const { return ""; }
            virtual void begin() const {}
            virtual void commit() const {}
            virtual void rollback() const {}
            virtual Result* execute(const std::string& query) const = 0;
            virtual Cursor* cursor(const std::string& query) const = 0;
            virtual std::string groupInsert(const Record& tables, 
                                 const Records& fields, 
                                 const Records& values, 
                    const std::string& sequence) const;
      static std::unique_ptr<Backend> getBackend(const std::string& type, const std::string& connInfo) noexcept(false);// DatabaseError);
      
    };
}
 
#endif