[{"createTime":1735734952000,"id":1,"img":"hwy_ms_500_252.jpeg","link":"https://activity.huaweicloud.com/cps.html?fromacct=261f35b6-af54-4511-a2ca-910fa15905d1&utm_source=V1g3MDY4NTY=&utm_medium=cps&utm_campaign=201905","name":"华为云秒杀","status":9,"txt":"华为云38元秒杀","type":1,"updateTime":1735747411000,"userId":3},{"createTime":1736173885000,"id":2,"img":"txy_480_300.png","link":"https://cloud.tencent.com/act/cps/redirect?redirect=1077&cps_key=edb15096bfff75effaaa8c8bb66138bd&from=console","name":"腾讯云秒杀","status":9,"txt":"腾讯云限量秒杀","type":1,"updateTime":1736173885000,"userId":3},{"createTime":1736177492000,"id":3,"img":"aly_251_140.png","link":"https://www.aliyun.com/minisite/goods?userCode=pwp8kmv3","memo":"","name":"阿里云","status":9,"txt":"阿里云2折起","type":1,"updateTime":1736177492000,"userId":3},{"createTime":1735660800000,"id":4,"img":"vultr_560_300.png","link":"https://www.vultr.com/?ref=9603742-8H","name":"Vultr","status":9,"txt":"Vultr送$100","type":1,"updateTime":1735660800000,"userId":3},{"createTime":1735660800000,"id":5,"img":"jdy_663_320.jpg","link":"https://3.cn/2ay1-e5t","name":"京东云","status":9,"txt":"京东云特惠专区","type":1,"updateTime":1735660800000,"userId":3},{"createTime":1735660800000,"id":6,"img":"new_ads.png","link":"https://www.iodraw.com/ads","name":"发布广告","status":9,"txt":"发布广告","type":1,"updateTime":1735660800000,"userId":3},{"createTime":1735660800000,"id":7,"img":"yun_910_50.png","link":"https://activity.huaweicloud.com/discount_area_v5/index.html?fromacct=261f35b6-af54-4511-a2ca-910fa15905d1&utm_source=aXhpYW95YW5nOA===&utm_medium=cps&utm_campaign=201905","name":"底部","status":9,"txt":"高性能云服务器2折起","type":2,"updateTime":1735660800000,"userId":3}]
这是我前两天遇到的问题,当时我把字符串传进去,发现查出来的数据与我想要的不是太一样,
所以当时我就在思考是哪里出错了,之后认真比较,发现是SQL语句编写的有问题。当时是直接把前端传过来的字符串放到了in()里边,大至操作如下:
<if test="query.committeeId != null and query.committeeId != ''"> AND
hmo.committee_id in(#{query.committeeId}) </if>
之后发现这样操作是错误的,里面的string字符串无法被完全解析出来,这也就导致查询出来的数据对应不上。
最后我查阅大量资料,发现可以用 FIND_IN_SET 来转换字符串,挺好用的。于是上面的sql语句就转变成了如下形式:
<if test="query.committeeId != null and query.committeeId != ''"> AND
FIND_IN_SET(hmo.committee_id,#{query.committeeId}) </if> <!-- 第一个参数为数据库的判断字段
第二个参数为string字符串 -->
挺好用的我感觉,不需要在业务层再进行字符串分割取值了。