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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) 2004, 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                          const PGSTD::string &CName) :
00061     transaction_base(C, NName, CName),
00062     m_StartCmd()
00063   {
00064     if (IsolationString != isolation_traits<read_committed>::name())
00065       m_StartCmd = "SET TRANSACTION ISOLATION LEVEL " + IsolationString;
00066   }
00067 
00069   void start_backend_transaction()
00070   {
00071     DirectExec("BEGIN", 2);
00072     if (!startcommand().empty()) DirectExec(startcommand().c_str());
00073   }
00074 
00076   const PGSTD::string &startcommand() const { return m_StartCmd; }
00077 
00078 #ifdef PQXX_DEPRECATED_HEADERS
00079 
00080   const PGSTD::string &StartCmd() const { return startcommand(); }
00081 #endif
00082 
00083 private:
00084 
00086   virtual void do_begin() =0;
00088   virtual result do_exec(const char Query[]);                           //[t1]
00090   virtual void do_commit() =0;
00092   virtual void do_abort() =0;
00093 
00095   PGSTD::string m_StartCmd;
00096 };
00097 
00098 
00099 inline result dbtransaction::do_exec(const char Query[])
00100 {
00101   result R;
00102   try
00103   {
00104     R = DirectExec(Query);
00105   }
00106   catch (const PGSTD::exception &)
00107   {
00108     try { abort(); } catch (const PGSTD::exception &) {}
00109     throw;
00110   }
00111   return R;
00112 }
00113 
00114 } // namespace pqxx
00115 

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