Mybatis中List傳值

隱身的提莫發表於2020-08-16

Mybatis遇到List傳值時常用方法。

1. List<E>,E為基本資料型別和String

 Mapper類檔案:
List<User> selectByIds(List<String> userList);
       
  Mapper.xml檔案:
  <select id="selectByIds" parameterType="java.lang.String" resultType="com.example.demo.dto.User">
     SELECT id,name,note from USER where id in
      <foreach collection="list" separator="," open="(" close=")" item="id">
       #{id}
      </foreach>
   </select>

測試結果:

2. List<E>,E為Object物件

  **2.1 不配合@param使用**

  Mapper類檔案:
  List<User> selectUser1(List<User> userList);

  Mapper.xml檔案:
  <select id="selectUser1" parameterType="java.util.List" resultType="com.example.demo.dto.User">
    SELECT id,name,note from USER where id in
    <foreach collection="list" separator="," open="(" close=")" item="user">
        #{user.id}
    </foreach>
   </select>    

測試結果:

  **2.2 配合@param使用,自定義引數名**

  Mapper類檔案:
  List<User> selectUser2(@Param("userList") List<User> userList);

  Mapper.xml檔案:
   <select id="selectUser2" parameterType="java.util.List" resultType="com.example.demo.dto.User">
    SELECT id,name,note from USER
    where id in
    <foreach collection="userList" separator="," open="(" close=")" item="user">
        #{user.id}
    </foreach>
   </select>

測試結果:

3. Map<k,V>,V為List物件

  **3.1 不配合@param使用**

  Mapper類檔案:
  List<User> selectByMap1(Map<String,List<User>> paramMap);

  Mapper.xml檔案:
  <select id="selectByMap1" parameterType="java.util.Map" resultType="com.example.demo.dto.User">
    SELECT id,name,note from USER
    where id in
    <foreach collection="userMap" separator="," open="(" close=")" item="user">
        #{user.id}
    </foreach>
</select>

測試結果:

  **3.2 配合@param使用,自定義引數名**

  Mapper類檔案:
  List<User> selectByMap2(@Param("mapList") Map<String,List<User>> paramMap);

  Mapper.xml檔案:
  <select id="selectByMap2" parameterType="java.util.Map" resultType="com.example.demo.dto.User">
    SELECT id,name,note from USER
    where id in
    <foreach collection="mapList.userMap" separator="," open="(" close=")" item="user">
        #{user.id}
    </foreach>
  </select>

測試結果:

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