dbconnection2.h

c++编程思想2TICPP-2nd-ed-Vol-two.zip

//: C09:DBConnection2.h
// From "Thinking in C++, Volume 2", by Bruce Eckel & Chuck Allison.
// (c) 1995-2004 MindView, Inc. All Rights Reserved.
// See source code use permissions stated in the file 'License.txt',
// distributed with the code package available at www.MindView.net.
// A parameterized mixin.
#ifndef DBCONNECTION2_H
#define DBCONNECTION2_H
#include <cassert>
#include <string>
#include "Database.h"
using std::string;

template<class Counter>
class DBConnection : public Database, public Counter {
  DBConnection(const DBConnection&); // Disallow copy
  DBConnection& operator=(const DBConnection&);
protected:
  DBConnection(const string& dbStr) throw(DatabaseError)
  : Database(dbStr) { open(); }
  ~DBConnection() { close(); }
public:
  static DBConnection* create(const string& dbStr)
  throw(DatabaseError) {
    DBConnection* con = new DBConnection(dbStr);
    con->attach();
    assert(con->refCount() == 1);
    return con;
  }
  // Other added functionality as desired...
};
#endif // DBCONNECTION2_H ///:~