需求描述:

　　通过json_insert向json字段中插入值,在此进行实验,记录下.

操作过程:

1.查看已经有的包含json数据类型的表

mysql> select * from tab_json;+----+------------------------------------------------------------------------------------------------+| id | data |+----+------------------------------------------------------------------------------------------------+| 1 | {"age": "33", "tel": 13249872314, "name": "Mike", "address": "Shenzhen", "passcode": "654567"} || 2 | {"age": "33", "tel": 189776542, "name": "David", "olds": "12", "address": "Hangzhou"} |+----+------------------------------------------------------------------------------------------------+2 rows in set (0.00 sec)

2.通过json_insert来插入值

mysql> update tab_json set data = json_insert(data,"$.age","22") where id = 1; #对一个已经存在的key进行操作,值没有变化Query OK, 0 rows affected (0.00 sec)Rows matched: 1 Changed: 0 Warnings: 0mysql> select * from tab_json;+----+------------------------------------------------------------------------------------------------+| id | data |+----+------------------------------------------------------------------------------------------------+| 1 | {"age": "33", "tel": 13249872314, "name": "Mike", "address": "Shenzhen", "passcode": "654567"} || 2 | {"age": "33", "tel": 189776542, "name": "David", "olds": "12", "address": "Hangzhou"} |+----+------------------------------------------------------------------------------------------------+2 rows in set (0.00 sec)mysql> update tab_json set data = json_insert(data,"$.CARD","1989833333") where id = 1; #对不存在的key进行操作,结果是增加了key-value值Query OK, 1 row affected (0.01 sec)Rows matched: 1 Changed: 1 Warnings: 0mysql> select * from tab_json;+----+----------------------------------------------------------------------------------------------------------------------+| id | data |+----+----------------------------------------------------------------------------------------------------------------------+| 1 | {"age": "33", "tel": 13249872314, "CARD": "1989833333", "name": "Mike", "address": "Shenzhen", "passcode": "654567"} || 2 | {"age": "33", "tel": 189776542, "name": "David", "olds": "12", "address": "Hangzhou"} |+----+----------------------------------------------------------------------------------------------------------------------+2 rows in set (0.00 sec)

备注:所以json_insert函数的作用就是插入,插入不存在的键值对,如果对于一个已经存在的key进行操作是没有变化的

文档创建时间:2018年6月5日22:06:43