mybatis中写sql语句的注意事项--批量新增数据

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<select id="" parameter="list">

insert into 表名

       <foreach collection="list" item="item" index="index"  open="("  close=")"  separator="union all">

            select #{item.字段1},

                       #{item.字段2}

                      from dual

    </foreach>

</select>