Oracle OCCI的一个简单的包装类的实现

注意：如果需要在vs2005中链接，需要到Oracle网站上下载最新的vs2005的occi库文件。

TOcci.h #ifndef _OCCIDATABASE_H_ #define _OCCIDATABASE_H_ #include; #include; #include; using namespace oracle::occi; using namespace std; namespace happyever { class TOcciDatabase { public: static TOcciDatabase* getInstance(string usr, string passwd, string db); int getConnectCount(){ return _Instance->count; }; Connection* getConnect(){ count++;return _Instance->conn; }; ~TOcciDatabase(); protected: TOcciDatabase(){}; TOcciDatabase(string usr, string passwd, string db); private: static TOcciDatabase* _Instance; static int count; Environment *env; Connection *conn; }; int TOcciDatabase::count = 0; TOcciDatabase* TOcciDatabase::_Instance = 0; TOcciDatabase::TOcciDatabase(string usr, string passwd, string db) { try { env = Environment::createEnvironment (Environment::DEFAULT); conn = env->createConnection (usr, passwd, db); } catch(SQLException ex) { cout<<'Exception thrown for getConnect'<cout<<'Error number: '<< ex.getErrorCode() << endl; cout<throw ex; } }; TOcciDatabase::~TOcciDatabase() { try { env->terminateConnection (conn); Environment::terminateEnvironment (env); } catch(SQLException ex) { cout<<'Exception thrown for getConnect'<cout<<'Error number: '<< ex.getErrorCode() << endl; cout<throw ex; } }; TOcciDatabase* TOcciDatabase::getInstance(string usr, string passwd, string db) { if(_Instance == 0) { _Instance = new TOcciDatabase(usr,passwd,db); } return _Instance; }; class TOcciQuery { private: Connection *conn; Statement *stmt; bool isAutoCommit; TOcciQuery(){}; public : TOcciQuery(Connection *connect){ conn = connect; }; void beginTrans(); void commit(); void roolback(); boolean getAutoCommit(); ResultSet* executeQuery(string sql) ; void executeUpdate(string sql) ; void close() { if(stmt != NULL) conn->terminateStatement (stmt); }; void close(ResultSet* rs); }; void TOcciQuery::close(ResultSet* rs) { if(rs != NULL) stmt->closeResultSet (rs); if(stmt != NULL) conn->terminateStatement (stmt); }; void TOcciQuery::beginTrans() { try { isAutoCommit = stmt->getAutoCommit(); stmt->setAutoCommit(false); } catch(SQLException ex) { cout<<'Exception thrown for beginTrans'<cout<<'Error number: '<< ex.getErrorCode() << endl; cout<throw ex; } }; void TOcciQuery::commit() { try { conn->commit(); stmt->setAutoCommit(isAutoCommit); } catch(SQLException ex) { cout<<'Exception thrown for commit'<cout<<'Error number: '<< ex.getErrorCode() << endl; cout<throw ex; } }; void TOcciQuery::roolback() { try { conn->rollback(); stmt->setAutoCommit(isAutoCommit); } catch(SQLException ex) { cout<<'Exception thrown for roolback'<cout<<'Error number: '<< ex.getErrorCode() << endl; cout<throw ex; } }; boolean TOcciQuery::getAutoCommit() { boolean result = false; try { result = stmt->getAutoCommit(); } catch(SQLException ex) { cout<<'Exception thrown for getAutoCommit'<cout<<'Error number: '<< ex.getErrorCode() << endl; cout<throw ex; } return result; }; ResultSet* TOcciQuery::executeQuery(string sql) { ResultSet*rs = NULL; try { stmt = conn->createStatement(); rs = stmt->executeQuery(sql); } catch (SQLException ex) { cout<<'Exception thrown for executeQuery'<cout<<'Error number: '<< ex.getErrorCode() << endl; cout<throw ex; } return rs; }; void TOcciQuery::executeUpdate(string sql) { try { stmt = conn->createStatement(); stmt->executeUpdate(sql); } catch (SQLException ex) { cout<<'Exception thrown for executeUpdate'<cout<<'Error number: '<< ex.getErrorCode() << endl; cout<throw ex; } }; } #endif /*_OCCIDATABASE_H_*/ 测试程序main.cpp源码如下： // occi.cpp : 定义控制台应用程序的入口点。 // #include 'stdafx.h' #include 'TOcci.h' int _tmain(int argc, _TCHAR* argv[]) { using namespace happyever; TOcciQuery *query = new TOcciQuery(TOcciDatabase::getInstance('cal','cal','v2b76')->getConnect()); string strSQL = 'select count(*) from serv_value_total'; ResultSet* rs = query->executeQuery(strSQL); while(rs->next()) { std::cout<<'count = '<getInt(1)<} query->close(rs); delete(query); return 1; }