Mybatis 根据集合、数组查询数据的几种方法

一、根据List集合查询数据

1. xml代码

// controller接口调用
List<Integer> idList = new ArrayList<>();
idList.add(1);
idList.add(2);
List<TUser> list1 = ttUserMapper.findList1(idList);

// 接口
List<TUser> findList1(@Param("idList")List<Integer> idList);

// xml
<select id="findList1" resultMap="BaseResultMap">
    select
    <include refid="Base_Column_List" />
    from t_user
    where id in
      <foreach collection="idList" item="id" index="index" open="(" close=")" separator=",">
        #{id}
      </foreach>
  </select>

或者接口中不写注解@Param("idList")，xml里的collection="list"   这样就行

二、根据数组查询数据

// controller调用接口
Integer[] ids = new Integer[3];
ids[0] = 1;
ids[1] = 2;
ids[2] = 3;
List<TUser> list2 = ttUserMapper.findList2(ids);

// 接口
List<TUser> findList2(@Param("idList")Integer[] idList);
// xml
<select id="findList2" resultMap="BaseResultMap">
    select
    <include refid="Base_Column_List" />
    from t_user
    where id in
    <foreach collection="idList" item="id" index="index" open="(" close=")" separator=",">
      #{id}
    </foreach>
  </select>

或者接口中不写注解@Param("idList")，xml里的collection="array"   这样就行

标签：xml,idList,List,ids,接口,查询,Param,数组,Mybatis
来源： https://blog.csdn.net/qq_43037478/article/details/110004500