JDBC编程的详细步骤

// 加载JDBC驱动程序
Class.forName("com.mysql.jdbc.Driver");
// 创建数据库连接
Connection connection = DriverManager.getConnection(url);

DataSource ds = new MysqlDataSource();
((MysqlDataSource) ds).setUrl("jdbc:mysql://localhost:3306/test");
((MysqlDataSource) ds).setUser("root");
((MysqlDataSource) ds).setPassword("root");
Connection connection = ds.getConnection();

String sql = "select * from user where username=? and password=? ";
        PreparedStatement ps = c.prepareStatement(sql);

 ps.setString(1,input.getUsername());
        ps.setString(2,input.getPassword());
        ResultSet rs = ps.executeQuery();

   User query = null;
        while(rs.next()){//移动到下一行，有数据就返回true
            query = new User();
            query.setId(rs.getInt("id"));
            query.setUsername(input.getUsername());
            query.setPassword(input.getPassword());
            query.setNickname(rs.getString("nickname"));
            query.setSex(rs.getBoolean("sex"));
            Timestamp t = rs.getTimestamp("birthday");
            if(t!=null){
                query.setBirthday(new java.util.Date(t.getTime()));

            }
            query.setHead(rs.getString("head"));
        }

 DBUtil.close(c, ps, rs);
        return query;