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dbtransaction.hxx

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00001 /*-------------------------------------------------------------------------
00002  *
00003  *   FILE
00004  *      pqxx/dbtransaction.hxx
00005  *
00006  *   DESCRIPTION
00007  *      definition of the pqxx::dbtransaction abstract base class.
00008  *   pqxx::dbransaction defines a real transaction on the database
00009  *   DO NOT INCLUDE THIS FILE DIRECTLY; include pqxx/dbtransaction instead.
00010  *
00011  * Copyright (c) 2003, Jeroen T. Vermeulen <jtv@xs4all.nl>
00012  *
00013  * See COPYING for copyright license.  If you did not receive a file called
00014  * COPYING with this source code, please notify the distributor of this mistake,
00015  * or contact the author.
00016  *
00017  *-------------------------------------------------------------------------
00018  */
00019 #include <string>
00020 
00021 #include "pqxx/transaction_base"
00022 
00023 namespace pqxx
00024 {
00025 
00027 
00054 class PQXX_LIBEXPORT dbtransaction : public transaction_base
00055 {
00056 protected:
00057   explicit dbtransaction(connection_base &C,
00058                          const PGSTD::string &IsolationString,
00059                          const PGSTD::string &NName) :
00060     transaction_base(C, NName),
00061     m_StartCmd()
00062   {
00063     if (IsolationString != isolation_traits<read_committed>::name())
00064       m_StartCmd = "SET TRANSACTION ISOLATION LEVEL " + IsolationString;
00065   }
00066 
00068   void start_backend_transaction()
00069   {
00070     DirectExec("BEGIN", 2);
00071     if (!startcommand().empty()) DirectExec(startcommand().c_str());
00072   }
00073 
00075   const PGSTD::string &startcommand() const { return m_StartCmd; }
00076 
00077 #ifdef PQXX_DEPRECATED_HEADERS
00078 
00079   const PGSTD::string &StartCmd() const { return startcommand(); }
00080 #endif
00081 
00082 private:
00083 
00085   virtual void do_begin() =0;
00087   virtual result do_exec(const char Query[]);                           //[t1]
00089   virtual void do_commit() =0;
00091   virtual void do_abort() =0;
00092 
00094   PGSTD::string m_StartCmd;
00095 };
00096 
00098 template<> inline PGSTD::string Classname(const dbtransaction *) 
00099 { 
00100   return "dbtransaction"; 
00101 }
00102 
00103 
00104 inline result dbtransaction::do_exec(const char Query[])
00105 {
00106   result R;
00107   try
00108   {
00109     R = DirectExec(Query);
00110   }
00111   catch (const PGSTD::exception &)
00112   {
00113     try { abort(); } catch (const PGSTD::exception &) {}
00114     throw;
00115   }
00116   return R;
00117 }
00118 
00119 }
00120 

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