mybatis判斷list為空

在傳入的map或者對象里面存在一個list,此時想要判斷list是否為空,可以

<if test="spids.size()>0 " >
        and  SPid not in
        <foreach collection="spids" item="id" index="index"
                 open="(" close=")" separator=",">
          #{id}
        </foreach>
</if>