Listing 4: Encapsulates CDatabase connectivity

// Connect.h

#if !defined(CONNECT_H)
#define CONNECT_H

#include <afx.h>      // For BOOL and CString
#include <afxdb.h>    // For CDatabase
class Connection : public CDatabase
{
public:
    static Connection* create(const CString& conSpec,BOOL readOnly = FALSE);

    long attach();    // Increments # clients
    long detach();    // Decrements # clients
                      // (self-destructs at 0)
    long nClients() const;
    void commit();
    void rollback();
private:
    long refCount;    // # clients using the
                      // connection
    // Only Connection::create can
    // instantiate Connections:
    Connection();
    ~Connection();
};

#endif

/* End of File */