先贴实体类
```
public class VideoOrder {
private int id;

private String outTradeNo;

private String state;

private Date createTime;

private int totalFee;

private int videoId;

private String videoTitle;

private String videoImg;

private int userId;

private User user;

get set 方法
}

```
```
public class User {

private int id;

private String name;

private String pwd;

private String headImg;

private String phone;

private Date createTime;

private List<VideoOrder> videoOrderList;

get set 方法
}
```
```
在使用mybatis 的注解方式对数据库内信息进行多表查询时，只返回了VideoOrder查询信息，而user返回信息为null，求答疑！！
贴mapper 代码

```
public interface VideoOrderMapper {

@Select("SELECT O.id,O.video_title,O.total_fee,U.name,U.phone FROM" +
" video_order O " +
"LEFT JOIN " +
"user U ON O.user_id = U.id")
@Results(id = "queryVideoOrderList",value = {
@Result(id = true,property = "id",column = "id"),
@Result(property = "videoTitle",column = "video_title"),
@Result(property = "totalFee",column = "total_fee"),
@Result(property = "user",column = "user_id",one = @One(select = "cn.my.mapper.UserMapper.findUserById"),javaType = User.class)
})
public List<VideoOrder> queryVideoOrderList();
}

```
```

再贴一下输出结果

[VideoOrder{id=1, outTradeNo='null', state='null', createTime=null, totalFee=32, videoId=0, videoTitle='xx教程', videoImg='null', userId=0, user=null}, VideoOrder{id=2, outTradeNo='null', state='null', createTime=null, totalFee=42, videoId=0, videoTitle='Harbor', videoImg='null', userId=0, user=null}]

初学Mybatis还请各位大神多多指教！谢谢各位大神！！！！跪求答案

如何创建实时AJAX？

weixin_33712987

3个回复