在Eclipse中封装程序通过JDBC访问MySQL的代码

public class ConDB




...{





private Connection _con;


private String _driver;


private String _userName;


private String _password;


private String _dburl;


private Statement _stmt;





public ConDB()




...{


_dburl = "jdbc:mysql://localhost:3306/mysql";


_userName = "root";


_password = "123456789";


_driver ="com.mysql.jdbc.Driver";





try




...{


Class.forName(_driver); //加载MYSQL JDBC驱动程序


}


catch (Exception e)




...{


System.out.print("Error loading Mysql Driver!");


e.printStackTrace();


}


try




...{


Connection connect = DriverManager.getConnection(


_dburl,_userName,_password);


//System.out.println("Success connect Mysql server!");


}


catch (Exception e)




...{


System.out.print("get data error!");


e.printStackTrace();


}


}


//按照给定的sql进行数据库查询


public ResultSet executeQuery(String sql)




...{


ResultSet rset = null;


try




...{


Class.forName(_driver);


_con = DriverManager.getConnection(_dburl,_userName,_password);


_stmt = _con.createStatement();


rset = _stmt.executeQuery(sql);


}catch(Exception e)




...{


System.out.println("Query Error!!!!!!!!!");


}


return rset;


}




//修改、插入、删除


public void updateDB(String sql)




...{


try




...{


Class.forName(_driver);


_con = DriverManager.getConnection(_dburl,_userName,_password);


_stmt = _con.createStatement();


_stmt.executeUpdate(sql);


}catch(Exception e)




...{


System.out.println("UpDate Error!!!!!!!");


}


}





//关闭数据库链接


public void closeDB()




...{


try




...{


_con.close();


}catch(SQLException ex)




...{


System.err.println(ex.getMessage());


}


}


}