mybatis 批量查询参数语句

<select id="selectUserByList" parameterClass="HashMap" resultClass="UserInfo">
      select * from user
        <dynamic prepend="WHERE">
            <isNotNull property="userId">
                <iterate property="userId" conjunction=" or " close=")" open="("> 
                    userId = #userId[]# 
                </iterate>
            </isNotNull>
        </dynamic>
</select>

<delete id="del" parameterClass="HashMap">
    DELETE FROM user WHERE  userId  in
    <iterate property="userIds" conjunction="," open="(" close=")">
        #userIds[]#
    </iterate>
  </delete>