mybatis foreach循环使用的两种传参方式

方式一：传参ids是用逗号隔开

Mapper.java
	List<> selectByIds(@Param("ids") String ids);
    
Mapper.xml
    <select id="selectByIds" parameterType="String" resultType="String">
		select * from table a where a.id in
		<foreach item="item" index="index" collection="ids.split(',')"
	               open="(" separator="," close=")"> #{item}
	    </foreach>
    </select>

方式二：传参ids是用List<String> 集合

Mapper.java
		List<> selectByIds(@Param("ids") List<String> ids);


 Mapper.xml
	  <select id="selectByIds" parameterType="list" resultMap="BaseResultMap">
		select * from table a where a.id in
	    <foreach item="item" index="index" collection="ids"
                 open="(" separator="," close=")"> #{item}
        </foreach>
	</select>