1. findByIds(List ids)

如果参数的类型是List, 则在使用时,collection属性要必须指定为 list

<select id="findByIdsMap" resultMap="BaseResultMap">  

 Select  

 <include refid="Base_Column_List" />  

 from jria where ID in  

 <foreach item="item" index="index" collection="list" open="(" separator="," close=")">  

  #{item}  

 </foreach>  

</select>  

2:findByIds(Long[] ids)

如果参数的类型是Array,则在使用时,collection属性要必须指定为 array

<select id="findByIdsMap" resultMap="BaseResultMap">  

    select  

    <include refid="Base_Column_List" />  

    from tabs where ID in  

    <foreach item="item" index="index" collection="array" open="(" separator="," close=")">  

     #{item}  

    </foreach>  

</select>  

3. findByIds(String name, Long[] ids)

当查询的参数有多个时: 

这种情况需要特别注意,在传参数时,一定要改用Map方式, 这样在collection属性可以指定名称

 Map<String, Object> params = new HashMap<String, Object>(2);

 params.put("name", name);

 params.put("ids", ids);

 mapper.findByIdsMap(params);

<select id="findByIdsMap" resultMap="BaseResultMap">  

     select  

     <include refid="Base_Column_List" />  

     from tabs where 

     name = #{name}

     and ID in  

     <foreach item="item" index="index" collection="ids" open="(" separator="," close=")">  

      #{item}  

     </foreach>  

</select>