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Viewing changes to include/sqlite3cc/transaction.h

  • Committer: edam
  • Date: 2012-01-23 13:51:26 UTC
  • Revision ID: edam@waxworlds.org-20120123135126-7gohm0mv9qwismla
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{
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class database;
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/**
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 * A basic (default, deferred) transaction.
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 */
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class basic_transaction
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        :
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        private boost::noncopyable
 
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class connection;
 
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namespace detail
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{
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//______________________________________________________________________________
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//                                                                 instantiation
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public:
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        /**
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         * Constructor that provides a database upon which to act
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         * @param database a database
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         */
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        explicit basic_transaction(
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                database &database );
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//______________________________________________________________________________
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//                                                              public interface
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public:
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        /**
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         * Begin the transaction
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         */
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        virtual void begin();
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        /**
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         * Commit the transaction
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         */
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        virtual void commit();
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        /**
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         * Rollback the transaction
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         */
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        virtual void rollback();
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//______________________________________________________________________________
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//                                                                implementation
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protected:
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        /** close any in-progress statements */
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        void invalidate_queries();
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        /** the database on which to act */
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        database &_database;
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};
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////////////////////////////////////////////////////////////////////////////////
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/**
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 * An exclusive transaction
 
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        /**
 
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         * A basic (default, deferred) transaction.
 
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         */
 
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        class basic_transaction
 
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                :
 
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                private boost::noncopyable
 
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        {
 
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        //__________________________________________________________________________
 
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        //                                                             instantiation
 
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        public:
 
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                /**
 
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                 * Constructor that provides a connection upon which to act
 
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                 * @param connection a connection
 
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                 */
 
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                explicit basic_transaction(
 
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                        connection &connection );
 
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        //__________________________________________________________________________
 
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        //                                                          public interface
 
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        public:
 
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                /**
 
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                 * Begin the transaction
 
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                 */
 
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                virtual void begin();
 
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                /**
 
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                 * Commit the transaction
 
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                 */
 
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                virtual void commit();
 
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                /**
 
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                 * Rollback the transaction
 
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                 */
 
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                virtual void rollback();
 
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        //__________________________________________________________________________
 
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        //                                                            implementation
 
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        protected:
 
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                /** reset any in-progress statements */
 
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                void reset_active_queries();
 
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                /** the connection on which to act */
 
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                connection &_connection;
 
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        };
 
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} // namespace detail
 
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////////////////////////////////////////////////////////////////////////////////
 
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/**
 
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 * A deferred transaction
 
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 */
 
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typedef detail::basic_transaction deferred_transaction;
 
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////////////////////////////////////////////////////////////////////////////////
 
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/**
 
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 * An immediate transaction
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 */
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class immediate_transaction
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        :
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        public basic_transaction
 
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        public detail::basic_transaction
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{
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//______________________________________________________________________________
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//                                                                 instantiation
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public:
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        /**
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         * Constructor that provides a database upon which to act
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         * @param database a database
 
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         * Constructor that provides a connection upon which to act
 
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         * @param connection a connection
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         */
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        explicit immediate_transaction(
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                database &database );
 
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                connection &connection );
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//______________________________________________________________________________
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//                                                              public interface
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 */
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class exclusive_transaction
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        :
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        public basic_transaction
 
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        public detail::basic_transaction
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{
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//______________________________________________________________________________
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//                                                                 instantiation
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public:
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        /**
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         * Constructor that provides a database upon which to act
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         * @param database a database
 
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         * Constructor that provides a connection upon which to act
 
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         * @param connection a connection
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         */
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        explicit exclusive_transaction(
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                database &database );
 
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                connection &connection );
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//______________________________________________________________________________
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//                                                              public interface
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 */
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class recursive_transaction
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        :
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        public basic_transaction
 
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        public detail::basic_transaction
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{
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//______________________________________________________________________________
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//                                                                 instantiation
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public:
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        /**
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         * Constructor that provides a database upon which to act
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         * @param database a database
 
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         * Constructor that provides a connection upon which to act
 
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         * @param connection a connection
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         */
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        explicit recursive_transaction(
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                database &database );
 
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                connection &connection );
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//______________________________________________________________________________
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//                                                              public interface
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/**
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 * A scope guard, or sentinel for use with one of the transaction classes.
 
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 * A scope guard (sentinel) for use with one of the transaction
 
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 * classes to provide RAII-style transactions. It defaults to using
 
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 * deferred transactions.
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 */
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template< class T = basic_transaction >
 
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template< class T = deferred_transaction >
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class transaction_guard
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        :
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        private boost::noncopyable
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public:
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        /**
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         * Constructor that provides a database upon which to act
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         * @param database a database
 
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         * Constructor that provides a connection upon which to act
 
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         * @param connection a connection
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         */
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        explicit transaction_guard(
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                database &database )
 
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                connection &connection )
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                :
226
 
                _transaction( database ),
 
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                _transaction( connection ),
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                _released( false )
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        {
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                _transaction.begin();
231
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        ~transaction_guard()
233
249
        {
234
 
                if( !_released ) {
235
 
                        try {
236
 
                                _transaction.rollback();
237
 
                        }
238
 
                        catch( ... ) {
239
 
                        }
240
 
                }
 
250
                if( !_released )
 
251
                        _transaction.rollback();
241
252
        }
242
253
 
243
254
//______________________________________________________________________________
255
266
                }
256
267
        }
257
268
 
 
269
        /**
 
270
         * Rollback the transaction early
 
271
         */
 
272
        void rollback()
 
273
        {
 
274
                if( !_released ) {
 
275
                        _transaction.rollback();
 
276
                        _released = true;
 
277
                }
 
278
        }
 
279
 
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//______________________________________________________________________________
259
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//                                                                implementation
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protected: