kexi
transaction.h
00001 /* This file is part of the KDE project 00002 Copyright (C) 2003 Jaroslaw Staniek <js@iidea.pl> 00003 00004 This program is free software; you can redistribute it and/or 00005 modify it under the terms of the GNU Library General Public 00006 License as published by the Free Software Foundation; either 00007 version 2 of the License, or (at your option) any later version. 00008 00009 This program is distributed in the hope that it will be useful, 00010 but WITHOUT ANY WARRANTY; without even the implied warranty of 00011 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00012 Library General Public License for more details. 00013 00014 You should have received a copy of the GNU Library General Public License 00015 along with this program; see the file COPYING. If not, write to 00016 the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 00017 * Boston, MA 02110-1301, USA. 00018 */ 00019 00020 #ifndef KEXIDB_TRANSACTION_H 00021 #define KEXIDB_TRANSACTION_H 00022 00023 #include <qguardedptr.h> 00024 00025 #include <kexidb/kexidb_export.h> 00026 00027 namespace KexiDB { 00028 00029 class Connection; 00030 00035 class KEXI_DB_EXPORT TransactionData 00036 { 00037 public: 00038 TransactionData(Connection *conn); 00039 ~TransactionData(); 00040 00041 //helper for debugging 00042 static int globalcount; 00043 //helper for debugging 00044 static int globalCount(); 00045 00046 Connection *m_conn; 00047 bool m_active : 1; 00048 uint refcount; 00049 }; 00050 00052 00059 class KEXI_DB_EXPORT Transaction : public QObject 00060 { 00061 public: 00064 Transaction(); 00065 00067 Transaction( const Transaction& trans ); 00068 00069 virtual ~Transaction(); 00070 00071 Transaction& operator=(const Transaction& trans); 00072 00073 bool operator==(const Transaction& trans ) const; 00074 00075 Connection* connection() const; 00076 00079 bool active() const; 00080 00082 bool isNull() const; 00083 00085 static const Transaction null; 00086 00087 //helper for debugging 00088 static int globalCount(); 00089 static int globalcount; 00090 protected: 00091 00092 TransactionData *m_data; 00093 00094 friend class Connection; 00095 }; 00096 00098 00119 class KEXI_DB_EXPORT TransactionGuard 00120 { 00121 public: 00124 TransactionGuard( Connection& conn ); 00125 00127 TransactionGuard( const Transaction& trans ); 00128 00131 TransactionGuard(); 00132 00134 ~TransactionGuard(); 00135 00138 void setTransaction( const Transaction& trans ) { m_trans = trans; } 00139 00142 bool commit(); 00143 00145 void doNothing(); 00146 00148 const Transaction transaction() const { return m_trans; } 00149 00150 protected: 00151 Transaction m_trans; 00152 bool m_doNothing : 1; 00153 }; 00154 00155 } //namespace KexiDB 00156 00157 #endif 00158 00159
