mysql中json_merge函数的使用?
内容导读
互联网集市收集整理的这篇技术教程文章主要介绍了mysql中json_merge函数的使用?，小编现在分享给大家，供广大互联网技能从业者学习和参考。文章包含2669字，纯文字阅读大概需要4分钟。
内容图文
需求描述:
通过mysql中的json_merge函数,可以将多个json对象合并成一个对象
操作过程:
1.查看一张包含json列的表
mysql> select * from tab_json;
+----+-----------------------------------------------------------------------------------+
| id | data |
+----+-----------------------------------------------------------------------------------+
| 1 | {"Tel": "132223232444", "name": "david", "address": "Beijing"} |
| 2 | {"Tel": "13390989765", "name": "Mike", "address": "Guangzhou"} |
| 3 | {"names": "Smith"} |
| 4 | {"names": "Smith", "address": "Beijing"} |
| 5 | {"names": "Smith", "address": "Beijing", "birthday": "2018-09-09"} |
| 6 | {"Max": "true", "names": "Smith", "address": "Beijing", "birthday": "2018-09-09"} |
| 7 | {"max": "true", "names": "Smith", "address": "Beijing", "birthday": "2018-09-09"} |
| 8 | {"oax": "true", "names": "Smith", "address": "Beijing", "birthday": "2018-09-09"} |
+----+-----------------------------------------------------------------------------------+
8 rows in set (0.00 sec)
2.将names的值与address的值进行合并
mysql> select json_extract(data,‘$.names‘),json_extract(data,‘$.address‘) from tab_json;
+------------------------------+--------------------------------+
| json_extract(data,‘$.names‘) | json_extract(data,‘$.address‘) |
+------------------------------+--------------------------------+
| NULL | "Beijing" |
| NULL | "Guangzhou" |
| "Smith" | NULL |
| "Smith" | "Beijing" |
| "Smith" | "Beijing" |
| "Smith" | "Beijing" |
| "Smith" | "Beijing" |
| "Smith" | "Beijing" |
+------------------------------+--------------------------------+
8 rows in set (0.00 sec)
mysql> select json_merge(json_extract(data,‘$.names‘),json_extract(data,‘$.address‘)) from tab_json;
+-------------------------------------------------------------------------+
| json_merge(json_extract(data,‘$.names‘),json_extract(data,‘$.address‘)) |
+-------------------------------------------------------------------------+
| NULL |
| NULL |
| NULL |
| ["Smith", "Beijing"] |
| ["Smith", "Beijing"] |
| ["Smith", "Beijing"] |
| ["Smith", "Beijing"] |
| ["Smith", "Beijing"] |
+-------------------------------------------------------------------------+
8 rows in set (0.00 sec)
3.如果多个对象含有相同的key,那么也会进行合并为具体的values
mysql> SELECT JSON_MERGE(‘{"a": 1, "b": 2}‘, ‘{"c": 3, "a": 4}‘); +----------------------------------------------------+ | JSON_MERGE(‘{"a": 1, "b": 2}‘, ‘{"c": 3, "a": 4}‘) | +----------------------------------------------------+ | {"a": [1, 4], "b": 2, "c": 3} | +----------------------------------------------------+ 1 row in set (0.00 sec)
备注:将两个对象的值合并成一个,a这个key的值也增加到了2个.
文档创建:2018年6月6日17:49:18
原文：https://www.cnblogs.com/chuanzhang053/p/9146466.html
内容总结
以上是互联网集市为您收集整理的mysql中json_merge函数的使用?全部内容，希望文章能够帮你解决mysql中json_merge函数的使用?所遇到的程序开发问题。 如果觉得互联网集市技术教程内容还不错，欢迎将互联网集市网站推荐给程序员好友。
内容备注
版权声明：本文内容由互联网用户自发贡献，该文观点与技术仅代表作者本人。本站仅提供信息存储空间服务，不拥有所有权，不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容， 请发送邮件至 gblab@vip.qq.com 举报，一经查实，本站将立刻删除。
内容手机端
扫描二维码推送至手机访问。