UserMapper.java

void updateByIds(@Param("ids") List<String> ids,@Param("user") User user);

UserMapper.xml

<update id="updateByIds">
    update <include refid="Table_Name"/>
    <trim prefix="set" suffixOverrides=",">
        <if test="user.userId!=null">
            user_id= #{user.userId},
        </if>
        <if test="user.userName!= null and user.userName!= ''">
            user_name = #{user.userName},
        </if>
    </trim>
    where id in
    <foreach collection="ids" separator="," open="(" close=")"
             item="item">
        #{item}
    </foreach>
</update>