transaction.hpp

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#ifndef _TRANSACTION_HPP_INCLUDED
#define _TRANSACTION_HPP_INCLUDED
#include "database/vmTransactionInput.hpp"
#include "database/vmTransactionOutput.hpp"
#include "database/transactionExecStatemachine.hpp"
#include "database/databaseError.hpp"
#include "types/variant.hpp"
#include <string>
#include <vector>
#include <boost/shared_ptr.hpp>

namespace _Wolframe {
namespace db {

class Transaction
{
public:
        Transaction( const std::string& name_, const TransactionExecStatemachineR& stm_)
                :m_name(name_),m_stm(stm_){}

        virtual ~Transaction()                  {close();}
        const std::string& databaseID() const   {return m_stm->databaseID();}

        void begin();
        void commit();
        void rollback();
        void close()                            {m_stm.reset();}

        virtual bool execute( const VmTransactionInput& input, VmTransactionOutput& output);

        const std::string& name() const
        {
                return m_name;
        }

        class Result
        {
        public:
                typedef std::vector<types::Variant> Row;

                Result(){}
                Result( const std::vector<std::string>& colnames_, const std::vector<Row>& rows_)
                        :m_colnames(colnames_),m_rows(rows_){}
                Result( const Result& o)
                        :m_colnames(o.m_colnames),m_rows(o.m_rows){}

                const std::vector<std::string>& colnames() const        {return m_colnames;}
                const std::vector<Row>& rows() const                    {return m_rows;}
                std::size_t size() const                                {return m_rows.size();}
                std::vector<Row>::const_iterator begin() const          {return m_rows.begin();}
                std::vector<Row>::const_iterator end() const            {return m_rows.end();}

        private:
                std::vector<std::string> m_colnames;
                std::vector<Row> m_rows;
        };

        bool executeStatement( Result& result, const std::string& stm, const std::vector<types::Variant>& params=std::vector<types::Variant>());
        bool executeStatement( const std::string& stm, const std::vector<types::Variant>& params=std::vector<types::Variant>());

        TransactionExecStatemachine* execStatemachine()                 {return m_stm.get();}
        const DatabaseError* getLastError() const                       {return &m_lastError;}

private:
        Transaction( const Transaction&){}      //... non copyable

private:
        std::string m_name;
        TransactionExecStatemachineR m_stm;
        DatabaseError m_lastError;
};


typedef boost::shared_ptr<Transaction> TransactionR;

}} // namespace _Wolframe::db

#endif // _TRANSACTION_HPP_INCLUDED

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