Oracle OCCI的一个简单的包装类的实现

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; 

}