00001
00002
00003
00004
00005
00006
00007
00008
00009
00010
00011
00012
00013
00014
00015
00016
00017
00018
00019
00020
00021
00022
00023
00024
00025
00026
00027
00028
00029
00030 #include "pqxx/connection_base"
00031 #include "pqxx/isolation"
00032 #include "pqxx/result"
00033
00034
00035
00036
00037
00038 namespace pqxx
00039 {
00040 class connection_base;
00041 class result;
00042 class tablestream;
00043
00044
00046 template<> inline PGSTD::string Classname(const tablestream *)
00047 {
00048 return "tablestream";
00049 }
00050
00051
00053
00061 class PQXX_LIBEXPORT transaction_base
00062 {
00063
00064 public:
00066 typedef isolation_traits<read_committed> isolation_tag;
00067
00068 virtual ~transaction_base() =0;
00069
00071
00083 void commit();
00084
00086
00089 void abort();
00090
00092
00096 result exec(const char Query[],
00097 const PGSTD::string &Desc=PGSTD::string());
00098
00100
00107 result exec(const PGSTD::string &Query,
00108 const PGSTD::string &Desc=PGSTD::string())
00109 { return exec(Query.c_str(), Desc); }
00110
00112 void process_notice(const char Msg[]) const
00113 { m_Conn.process_notice(Msg); }
00115 void process_notice(const PGSTD::string &Msg) const
00116 { m_Conn.process_notice(Msg); }
00117
00118 PGSTD::string name() const { return m_Name; }
00119
00121 connection_base &conn() const { return m_Conn; }
00122
00124
00132 void set_variable(const PGSTD::string &Var, const PGSTD::string &Val);
00133
00135
00141 PGSTD::string get_variable(const PGSTD::string &) const;
00142
00143 #ifdef PQXX_DEPRECATED_HEADERS
00144
00145 void Commit() { commit(); }
00147 void Abort() { abort(); }
00149 result Exec(const char Q[], const PGSTD::string &D=PGSTD::string())
00150 { return exec(Q,D); }
00152 result Exec(const PGSTD::string &Q, const PGSTD::string &D=PGSTD::string())
00153 { return exec(Q,D); }
00155 void ProcessNotice(const char M[]) const { return process_notice(M); }
00157 void ProcessNotice(const PGSTD::string &M) const { return process_notice(M); }
00159 PGSTD::string Name() const { return name(); }
00161 connection_base &Conn() const { return conn(); }
00163 void SetVariable(const PGSTD::string &Var, const PGSTD::string &Val)
00164 { set_variable(Var,Val); }
00165 #endif
00166
00167 protected:
00170 explicit transaction_base(connection_base &,
00171 const PGSTD::string &TName=PGSTD::string());
00172
00175 void Begin();
00176
00178 void End() throw ();
00179
00181 virtual void do_begin() =0;
00183 virtual result do_exec(const char Query[]) =0;
00185 virtual void do_commit() =0;
00187 virtual void do_abort() =0;
00188
00189
00190
00192
00200 result DirectExec(const char C[], int Retries=0);
00201
00202 private:
00203
00204
00205
00206
00207
00208
00209
00210
00211
00212
00213
00214
00215
00216
00217
00218
00219
00220 enum Status
00221 {
00222 st_nascent,
00223 st_active,
00224 st_aborted,
00225 st_committed,
00226 st_in_doubt
00227 };
00228
00229
00230 void CheckPendingError();
00231
00232 friend class Cursor;
00233 int GetUniqueCursorNum() { return m_UniqueCursorNum++; }
00234 void MakeEmpty(result &R) const { m_Conn.MakeEmpty(R); }
00235
00236 friend class tablestream;
00237 void RegisterStream(tablestream *);
00238 void UnregisterStream(tablestream *) throw ();
00239 void RegisterPendingError(const PGSTD::string &) throw ();
00240 friend class tablereader;
00241 void BeginCopyRead(const PGSTD::string &Table);
00242 bool ReadCopyLine(PGSTD::string &L) { return m_Conn.ReadCopyLine(L); }
00243 friend class tablewriter;
00244 void BeginCopyWrite(const PGSTD::string &Table);
00245 bool WriteCopyLine(const PGSTD::string &L, bool async=false)
00246 { return m_Conn.WriteCopyLine(L, async); }
00247 void EndCopyWrite() throw () { m_Conn.EndCopyWrite(); }
00248
00249 connection_base &m_Conn;
00250
00251 PGSTD::string m_Name;
00252 int m_UniqueCursorNum;
00253 unique<tablestream> m_Stream;
00254 Status m_Status;
00255 bool m_Registered;
00256 mutable PGSTD::map<PGSTD::string, PGSTD::string> m_Vars;
00257 PGSTD::string m_PendingError;
00258
00259
00260 transaction_base();
00261 transaction_base(const transaction_base &);
00262 transaction_base &operator=(const transaction_base &);
00263 };
00264
00265
00266 }
00267
00268