Mybatis关联查询结果集对象嵌套的具体使用

在查询时经常出现一对多”的关系,所有会出现嵌套对象的情况，Mybatis在resultMap提供了collection标签，本文适合有一定Mybatis基础的读者查阅

数据模型WeixinActivity2018User.java

public class WeixinActivity2018User  implements Serializable{

    /** serialVersionUID*/
    private static final long serialVersionUID = -2740162776768956231L;

    private int id;
    private String nickname;  //昵称
    private String headurl;   //头像
    private String openid;    //微信用户OpenId
    private String unionid;
    private String phone;     //用户手机号
    private int count;        //积攒数
    private String createtime;//创建时间
    private String uptime;    //更新时间
    private List activity2018UserAssists;//点赞用户信息

数据模型WeixinActivity2018UserAssist.java

public class WeixinActivity2018UserAssist  implements Serializable{

    /** serialVersionUID*/
    private static final long serialVersionUID = -2740162776768956232L;

    private int aid;
    private int uid;
    private String nickname;
    private String headurl;
    private String openid;
    private String unionid;
    private String createtime;

WeixinActivity2018UserMapper.xml

  
    
    
    
    
    
    
    
    
    
    
            
             
            
            
            
            
            
    
  
  
    openid,unionid,phone,nickname,headurl,count,createtime,uptime
  
  
    insert into t_weixin_activity_2018_user (openid,unionid,phone,nickname,headurl,createtime,uptime)
    values (
        #{openid,jdbcType=VARCHAR},#{unionid,jdbcType=VARCHAR},#{phone,jdbcType=VARCHAR}, #{nickname,jdbcType=VARCHAR}, #{headurl,jdbcType=VARCHAR},now(),now()
    )
  
    
        SELECT  count(twau.id)
        from  t_weixin_activity_2018_user twau
        
            and twau.openid = #{openid}
        
        
            and twau.id = #{id}
        
        
            and twau.phone = #{phone}
        
    
    
        SELECT 
         twau.id,twau.openid, twau.unionid, twau.phone, twau.nickname, twau.headurl, twau.count,date_format( twau.createtime, '%Y-%m-%d %H:%m:%s') as createtime,date_format( twau.uptime, '%Y-%m-%d %H:%m:%s') as uptime
        ,twaua.aid,twaua.uid,twaua.openid as aopenid,twaua.unionid as aunionid,twaua.nickname as anickname,twaua.headurl as aheadurl,date_format(twaua.createtime, '%Y-%m-%d %H:%m:%s') as acreatetime ,
        twaua.phone as aphone
        from  t_weixin_activity_2018_user twau LEFT  JOIN t_weixin_activity_2018_user_assist twaua on twau.id=twaua.uid  where 1=1
        
            and twau.openid = #{openid}
        
        
            and twau.id = #{id}
        
        
            and twau.phone = #{phone}
        
        
            order by tlb.createtime desc limit ${start}, ${number}
        
  

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