ibatis 批量更新(一)

1.4.2.3 批量修改

  支持单个动态更新、批量动态更新

<update id="updateCONSULT_SCHEDULEDynamic" parameterClass="map">
    UPDATE CONSULT_SCHEDULE
    <dynamic prepend="set">
        <isNotEmpty prepend="," property="ORG_CODE">
            ORG_CODE = #ORG_CODE#
        </isNotEmpty>
        <isNotEmpty prepend="," property="DEPENT_ID">
            DEPENT_ID = #DEPENT_ID#
        </isNotEmpty>
        <isNotEmpty prepend="," property="DEPENT_NAME">
            DEPENT_NAME = #DEPENT_NAME#
        </isNotEmpty>
        <isNotEmpty prepend="," property="DOCTOR_ID">
            DOCTOR_ID = #DOCTOR_ID#
        </isNotEmpty>
        <isNotEmpty prepend="," property="DOCTOR_NAME">
            DOCTOR_NAME = #DOCTOR_NAME#
        </isNotEmpty>
        <isNotEmpty prepend="," property="DOCTOR_PHONE">
            DOCTOR_PHONE = #DOCTOR_PHONE#
        </isNotEmpty>
        <isNotEmpty prepend="," property="SCHEDULE_DATE">
            SCHEDULE_DATE = TO_DATE(#SCHEDULE_DATE#,'YYYY-MM-DD')
        </isNotEmpty>
        <isNotEmpty prepend="," property="WEEK_TXT">
            WEEK_TXT = #WEEK_TXT#
        </isNotEmpty>
        <isNotEmpty prepend="," property="WB_TYPE">
            WB_TYPE = #WB_TYPE#
        </isNotEmpty>
        <isNotEmpty prepend="," property="CLOSE_TZ">
            CLOSE_TZ = #CLOSE_TZ#
        </isNotEmpty>
        <isNotEmpty prepend="," property="REPLACE_TZ">
            REPLACE_TZ = #REPLACE_TZ#
        </isNotEmpty>
        <isNotEmpty prepend="," property="DOCTOR_ID_TZ">
            DOCTOR_ID_TZ = #DOCTOR_ID_TZ#
        </isNotEmpty>
        <isNotEmpty prepend="," property="DOCTOR_NAME_TZ">
            DOCTOR_NAME_TZ = #DOCTOR_NAME_TZ#
        </isNotEmpty>
        <isNotNull prepend="," property="REMARK">
            REMARK = #REMARK#
        </isNotNull>
    </dynamic>
    WHERE CONSULT_SCHEDULE_ID IN ($CONSULT_SCHEDULE_ID$) 
</update>

      注意:

        a.这种批量更新,只能统一更改某(几)个表字段的值(状态);

        b.批量操作时,iBATIS通过使用in()函数来实现,in()函数里面的内容只能通过"$变量$"来实现,不能通过"#变量#"实现;

        c.根据id进行修改,如果id是字符串,前台传参时,需手动拼接上字符串。

      举例:

        以id是字符串为例,讲解前台如何获取页面的值,并传至后台及iBATIS如何映射传递的值

        第一部分:js取值

          见文章:复选框-checkbox

        第二部分:Dao调取SQL

/**
 * 动态修改排班表表记录
 *
 * @param paramMap 排班表表map对象集合
 * @return 返回操作影响的行数
 * @throws DaoException
 */
public int updateCONSULT_SCHEDULEDynamic(Map paramMap) throws DaoException {
    try {
        return sqlMapClient.update("telemedicine.service.bo.remoteCons.schedule.updateCONSULT_SCHEDULEDynamic", paramMap);
    } catch (SQLException e) {
        String err = "修改排班表表出错->出错原因:" + e.getMessage();
        log.error(err, e);
        throw new DaoException(err, e);
    }
}

      第三部分:SQL,见上面

    说明:

      a.使用 in(#CONSULT_SCHEDULE_ID#),则解析出来的结果是:in('id1,id2');(错误)

      b.使用 in($CONSULT_SCHEDULE_ID$),解析出来的结果是:in('id1','id2');(正确)

错误用法

  情景描述

  virtual_card表中有两个唯一的字段:virtual_id和index_id,想根据其中一个字段进行更新;

  但是,传参可能是0个,1个或2个,考虑到能匹配不到的情况,所以使用了1=1

  动态sql

update virtual_card set
    index_id=#index_id#
where 1=1
<isNotEmpty prepend="and" property="virtual_id">
    virtual_id=#virtual_id#
</isNotEmpty>
<isNotEmpty prepend="and" property="index_id">
    index_id=#index_id#
</isNotEmpty>

 

  当传递的参数匹配不到的时候,执行的结果是:

 

  说明:

  where 1=1条件相当于没用,与下面的sql起到的效果一致 

update virtual_card set index_id=?

  将该表中该字段的值全部更新成了?,所以一定不能使用这个动态sql。

 

posted @ 2018-05-03 17:11  Marydon  阅读(1780)  评论(0编辑  收藏  举报