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00020 #include "pqxx/libcompiler.h"
00021
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00030
00031 #include "pqxx/connection_base"
00032 #include "pqxx/isolation"
00033 #include "pqxx/result"
00034
00035
00036
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00038
00039
00040 namespace pqxx
00041 {
00042 class connection_base;
00043 class transaction_base;
00044
00045
00046 namespace internal
00047 {
00048 class PQXX_LIBEXPORT transactionfocus : public namedclass
00049 {
00050 public:
00051 transactionfocus(transaction_base &t,
00052 const PGSTD::string &Name,
00053 const PGSTD::string &Classname) :
00054 namedclass(Name, Classname),
00055 m_Trans(t),
00056 m_registered(false)
00057 {
00058 }
00059
00060 protected:
00061 void register_me();
00062 void unregister_me() throw ();
00063 void reg_pending_error(const PGSTD::string &) throw ();
00064 bool registered() const throw () { return m_registered; }
00065
00066 transaction_base &m_Trans;
00067
00068 private:
00069 bool m_registered;
00070
00072 transactionfocus();
00074 transactionfocus(const transactionfocus &);
00076 transactionfocus &operator=(const transactionfocus &);
00077 };
00078 }
00079
00080
00081
00083
00091 class PQXX_LIBEXPORT transaction_base : public internal::namedclass
00092 {
00093
00094 public:
00096 typedef isolation_traits<read_committed> isolation_tag;
00097
00098 virtual ~transaction_base() =0;
00099
00101
00113 void commit();
00114
00116
00119 void abort();
00120
00122
00127 result exec(const char Query[],
00128 const PGSTD::string &Desc=PGSTD::string());
00129
00131
00139 result exec(const PGSTD::string &Query,
00140 const PGSTD::string &Desc=PGSTD::string())
00141 { return exec(Query.c_str(), Desc); }
00142
00143 result exec(const PGSTD::stringstream &Query,
00144 const PGSTD::string &Desc=PGSTD::string())
00145 { return exec(Query.str(), Desc); }
00146
00148
00163 result exec_prepared(const PGSTD::string &qname)
00164 { return m_Conn.pq_exec_prepared(qname.c_str(), 0, 0); }
00165
00167
00182 result exec_prepared(const char qname[])
00183 { return m_Conn.pq_exec_prepared(qname, 0, 0); }
00184
00186
00201 template<typename STRING, typename ITER>
00202 result exec_prepared(STRING qname, ITER beginargs, ITER endargs)
00203 {
00204 if (beginargs == endargs) return exec_prepared(qname);
00205
00206 typedef PGSTD::vector<PGSTD::string> pvec;
00207 pvec p;
00208 for (; beginargs!=endargs; ++beginargs) p.push_back(to_string(*beginargs));
00209 result r;
00210 const internal::scoped_array<const char *> pindex(p.size()+1);
00211 const pvec::size_type stop = p.size();
00212 for (pvec::size_type i=0; i < stop; ++i) pindex[i] = p[i].c_str();
00213 pindex[stop] = 0;
00214 r = m_Conn.pq_exec_prepared(qname, p.size(), pindex.c_ptr());
00215 return r;
00216 }
00217
00219
00234 template<typename CNTNR> result exec_prepared(const char qname[],
00235 const CNTNR &args)
00236 { return exec_prepared(qname, args.begin(), args.end()); }
00237
00239
00254 template<typename CNTNR>
00255 result exec_prepared(const PGSTD::string &qname, CNTNR args)
00256 { return exec_prepared(qname, args.begin(), args.end()); }
00257
00259 void process_notice(const char Msg[]) const
00260 { m_Conn.process_notice(Msg); }
00262 void process_notice(const PGSTD::string &Msg) const
00263 { m_Conn.process_notice(Msg); }
00264
00266 connection_base &conn() const { return m_Conn; }
00267
00269
00277 void set_variable(const PGSTD::string &Var, const PGSTD::string &Val);
00278
00280
00286 PGSTD::string get_variable(const PGSTD::string &) const;
00287
00288 #ifdef PQXX_DEPRECATED_HEADERS
00289
00290 void Commit() { commit(); }
00292 void Abort() { abort(); }
00294 result Exec(const char Q[], const PGSTD::string &D=PGSTD::string())
00295 { return exec(Q,D); }
00297 result Exec(const PGSTD::string &Q, const PGSTD::string &D=PGSTD::string())
00298 { return exec(Q,D); }
00300 void ProcessNotice(const char M[]) const { return process_notice(M); }
00302 void ProcessNotice(const PGSTD::string &M) const { return process_notice(M); }
00304 PGSTD::string Name() const { return name(); }
00306 connection_base &Conn() const { return conn(); }
00308 void SetVariable(const PGSTD::string &Var, const PGSTD::string &Val)
00309 { set_variable(Var,Val); }
00310 #endif
00311
00312 protected:
00314
00317 explicit transaction_base(connection_base &,
00318 const PGSTD::string &TName,
00319 const PGSTD::string &CName);
00320
00322
00324 void Begin();
00325
00327 void End() throw ();
00328
00330 virtual void do_begin() =0;
00332 virtual result do_exec(const char Query[]) =0;
00334 virtual void do_commit() =0;
00336 virtual void do_abort() =0;
00337
00338
00339
00341
00349 result DirectExec(const char C[], int Retries=0);
00350
00351 private:
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00371 enum Status
00372 {
00373 st_nascent,
00374 st_active,
00375 st_aborted,
00376 st_committed,
00377 st_in_doubt
00378 };
00379
00380
00381 void PQXX_PRIVATE CheckPendingError();
00382
00383 friend class Cursor;
00384 friend class cursor_base;
00385 int GetUniqueCursorNum() { return m_UniqueCursorNum++; }
00386 void MakeEmpty(result &R) const { m_Conn.MakeEmpty(R); }
00387
00388 friend class internal::transactionfocus;
00389 void PQXX_PRIVATE RegisterFocus(internal::transactionfocus *);
00390 void PQXX_PRIVATE UnregisterFocus(internal::transactionfocus *) throw ();
00391 void PQXX_PRIVATE RegisterPendingError(const PGSTD::string &) throw ();
00392 friend class tablereader;
00393 void PQXX_PRIVATE BeginCopyRead(const PGSTD::string &, const PGSTD::string &);
00394 bool ReadCopyLine(PGSTD::string &L) { return m_Conn.ReadCopyLine(L); }
00395 friend class tablewriter;
00396 void PQXX_PRIVATE BeginCopyWrite(const PGSTD::string &Table,
00397 const PGSTD::string &Columns = PGSTD::string());
00398 void WriteCopyLine(const PGSTD::string &L) { m_Conn.WriteCopyLine(L); }
00399 void EndCopyWrite() { m_Conn.EndCopyWrite(); }
00400
00401 friend class pipeline;
00402 void start_exec(const PGSTD::string &Q) { m_Conn.start_exec(Q); }
00403 internal::pq::PGresult *get_result() { return m_Conn.get_result(); }
00404 void consume_input() throw () { m_Conn.consume_input(); }
00405 bool is_busy() const throw () { return m_Conn.is_busy(); }
00406
00407 connection_base &m_Conn;
00408
00409 int m_UniqueCursorNum;
00410 internal::unique<internal::transactionfocus> m_Focus;
00411 Status m_Status;
00412 bool m_Registered;
00413 mutable PGSTD::map<PGSTD::string, PGSTD::string> m_Vars;
00414 PGSTD::string m_PendingError;
00415
00417 transaction_base();
00419 transaction_base(const transaction_base &);
00421 transaction_base &operator=(const transaction_base &);
00422 };
00423
00424 }
00425
00426