mybatis批量插入数据

<insert id="add" parameterType="map">        insert into tableName             <foreach item="item" collection="insertMap" separator="union">            select #{item.Id},                   #{item.Ip},                   #{item.Model},                   #{item.Name},                   #{item.cityId},                   #{item.TypeId}                       from dual            </foreach>    </insert>