使用BeanHandler和BeanListHandler

public class DBUtilsDemo03 {
    @Test
    public void queryUserByUid() throws SQLException {
        QueryRunner qr = new QueryRunner();
        String sql = "select * from users";
        User user = qr.query(C3P0Util.getConnection(), sql, new BeanHandler<User>(User.class));
        System.out.println(user);
    }
    @Test
    public void queryAllUser() throws SQLException {
        QueryRunner qr = new QueryRunner();

        String sql = "select * from users";

        List<User> result = qr.query(C3P0Util.getConnection(), sql, new BeanListHandler<>(User.class));

        for (User u : result) {
            System.out.println(u);
        }
    }
}

BeanHandler：将查询结果的第一行封装成指定的数据类型

 

BeanListHandler：将查询结果的每一行封装成指定类型的List集合