• 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。

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  • 原文地址:https://www.cnblogs.com/Marydon20170307/p/8986413.html
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