mysql trim函数中标签属性的用法

港控/mmm° 2022-05-29 00:23 204阅读 0赞

**mysql trim函数 中标签属性的用法**

**1.sql语句**

<update id="updateMerchantCompanyBatch" parameterType="java.util.List">
            update BAOFOO_MA.ma_merchant_company
            <trim prefix="set" suffixOverrides=",">
                <trim prefix="id_card =case" suffix="end,">
                    <foreach collection="list" item="item" index="index">
                            when member_id=#{item.member_id} then #{item.id_card}
                    </foreach>
                </trim>
                <trim prefix="link_mobile =case" suffix="end,">
                    <foreach collection="list" item="item" index="index">
                            when member_id=#{item.member_id} then #{item.link_mobile}
                    </foreach>
                </trim>
                <trim prefix="bank_account =case" suffix="end,">
                    <foreach collection="list" item="item" index="index">
                            when member_id=#{item.member_id} then #{item.bank_account}
                    </foreach>
                </trim>
            </trim>
            where member_id in
            <foreach collection="list" index="index" item="item" separator="," open="(" close=")">
                #{item.member_id}
            </foreach>
        </update>

2.翻译成SQL语句

UPDATE BAOFOO_MA.ma_merchant_company SET id_card= CASE WHEN member_id ='100000178' THEN 110 END, link_mobile = CASE WHEN member_id = '100000178' THEN 888 END 
    WHERE member_id IN (100000178)

trim标签的属性

1.  prefix：前缀覆盖并增加其内容。也就是给中的sql语句加上前缀；
2.  suffix：后缀覆盖并增加其内容。给包裹的sql语句加上后缀；
3.  prefixOverrides：前缀判断的条件。取消指定的前缀，如where；
4.  suffixOverrides：后缀判断的条件。取消指定的后缀，如and | or.，逗号等。(自动去除后面多余“，”)