//重载隐式转换操作符

       operator ValueType()

       {

              assert(m_cObject != NULL);

              assert(Get != NULL);

              return (m_cObject->*Get)();

       }

private:

       Container* m_cObject;                                     //属性的拥有者

       void (Container::*Set)(ValueType value);      //set函数指针

       ValueType (Container::*Get)();                           //get函数指针

};

class CAdoConnection

{

public:

       CAdoConnection();

       ~CAdoConnection();

       //隐式的转换操作,不推荐使用,只是暂时类没有封装好,给客户一个方便

       //使用时请确保指针在类的生命期内使用

       operator _ConnectionPtr();

public:

       CProperty<CAdoConnection, BOOL, READ_WRITE> Connected;

       string ConnectingString;

       string UserName, PassWord;

private:

       void SetConnected(BOOL ConnectFlag);

       BOOL GetConnected();

private:

       _ConnectionPtr m_ptrConn;

friend class CAdoCommand;

friend class CAdoQuery;

};

class CAdoCommand

{

public:

       CAdoCommand();

       ~CAdoCommand();

       void Execute();

       operator _CommandPtr();

public:

       CommandTypeEnum CommandType;

       string CommandText;

       CAdoConnection * m_AdoConnection;

private:

       _CommandPtr m_ptrComm;

};

//CAdoConnection

CAdoConnection::CAdoConnection()

{

       Connected.setContainer(this);&nbs

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