JDBC: DQL操作

 查询姓名为张百万的一条记录

public class TestJDBC02 {
 
    public static void main(String[] args) throws SQLException {
 
        //1.获取连接对象
        Connection connection = JDBCUtils.getConnection();
 
        //2.获取Statement对象
        Statement statement = connection.createStatement();
 
        String  sql = "SELECT * FROM jdbc_user WHERE username = '张百万';";
        ResultSet resultSet = statement.executeQuery(sql);
 
        //3.处理结果集
        while(resultSet.next()){
 
            //通过列名 获取字段信息
            int id = resultSet.getInt("id");
            String username = resultSet.getString("username");
            String password = resultSet.getString("password");
            String birthday = resultSet.getString("birthday");
 
            System.out.println(id+" "+username+" " + password +" " + birthday);
        }
 
        //4.释放资源            
        JDBCUtils.close(connection,statement,resultSet);
    }
}