Question

我有三个表，例如A，B，C；这是我的resultMap

WITH your_table AS (SELECT 1 ID, 1234512 nic, NULL ntn, NULL mbl, 'ABC' NAME FROM dual UNION ALL
                    SELECT 2 ID, NULL nic, 321 ntn, NULL mbl, 'ABC' NAME FROM dual UNION ALL
                    SELECT 3 ID, NULL nic, NULL ntn, 5421 mbl, 'ABC' NAME FROM dual UNION ALL
                    SELECT 4 ID, 541245 nic, 624 ntn, NULL mbl, 'ABC' NAME FROM dual)
SELECT ID, 
       COALESCE(nic, ntn, mbl) nic_ntn_mbl,
       NAME
FROM   your_table;

        ID NIC_NTN_MBL NAME
---------- ----------- ----
         1     1234512 ABC
         2         321 ABC
         3        5421 ABC
         4      541245 ABC

这是我的SQL查询

<resultMap id="picUserResultMap" type="PicUserAlias">
<id property="id" column="ID"></id>
<result property="bindId" column="BINDID"></result>
<result property="createDate" column="CREATEDATE"></result>
<result property="pictureId" column="PICTUREID"></result>
<result property="picture" column="PICTURE"></result>
<result property="picDescribe" column="PICDESCRIBE"></result>
<result property="pictureNo" column="PICTURENO"></result>
<result property="userId" column="USERID"></result>
<collection property="picTypeUserList" ofType="picTypeUserAlias">
  <result property="userId" column="userid"></result>
  <result property="picTypeId" column="pictypeid"></result>
  <result property="content" column="content"></result>
  <result property="isTags" column="istags"></result>
</collection>
<collection property="picDiscussList" ofType="PicDiscussAlias">
  <result property="id" column="id"></result>
  <result property="discussUser" column="discussuser"></result>
  <result property="userId" column="userid"></result>
  <result property="picUserId" column="picuserid"></result>
  <result property="content" column="content"></result>
</collection>

当我查询出来时，数据不正确，picDiscussList就像picTypeUserList 我不知道为什么任何帮助，将不胜感激。

Answer 1

Read the documentation about Advanced Result Maps。这两个集合都需要一个id，例如：用<result property="picTypeId" column="pictypeid"></result>替换<id property="picTypeId" column="pictypeid"/>

类型picTypeUserAlias和PicDiscussAlias不需要userid和id属性。

如何在Mybatis resultMap中使用Multiple集合

1 个答案: