mysql数据库中,如何对json数据类型的值进行修改?通过json_set函数对json字段值进行修改?

Posted 2020-11-11 QA-3K

需求描述:

　　今天在看mysql中存放json数据类型的问题,对于json数据进行修改的操作,

　　在此记录下.

操作过程:

1.创建包含json数据类型的表,插入基础数据

mysql> create table tab_json(id int not null auto_increment primary key,data json);
Query OK, 0 rows affected (0.03 sec)

mysql> insert into tab_json values (null,‘{"name":"Mike","address":"Beijing","tel":13249872314}‘);
Query OK, 1 row affected (0.01 sec)

mysql> insert into tab_json values (null,‘{"name":"David","address":"Shanghai","tel":189776542}‘);
Query OK, 1 row affected (0.01 sec)

mysql> select * from tab_json;
+----+------------------------------------------------------------+
| id | data                                                       |
+----+------------------------------------------------------------+
|  1 | {"tel": 13249872314, "name": "Mike", "address": "Beijing"} |
|  2 | {"tel": 189776542, "name": "David", "address": "Shanghai"} |
+----+------------------------------------------------------------+
2 rows in set (0.00 sec)

2.通过json_set函数,来修改data字段的值

mysql> update tab_json set data = json_set(data,"$.address","Guangzhou") where id = 1;  #对id = 1的行的address的键值进行修改.
Query OK, 1 row affected (0.26 sec)
Rows matched: 1  Changed: 1  Warnings: 0

mysql> select * from tab_json;
+----+--------------------------------------------------------------+
| id | data                                                         |
+----+--------------------------------------------------------------+
|  1 | {"tel": 13249872314, "name": "Mike", "address": "Guangzhou"} |
|  2 | {"tel": 189776542, "name": "David", "address": "Shanghai"}   |
+----+--------------------------------------------------------------+
2 rows in set (0.00 sec)

mysql> update tab_json set data = json_set(data,"$.address","Shenzhen");
Query OK, 2 rows affected (0.02 sec)
Rows matched: 2  Changed: 2  Warnings: 0

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

mysql> update tab_json set data = json_set(data,"$.address","Hangzhou") where id = 2; #对id为2的address键值进行修改
Query OK, 1 row affected (0.03 sec)
Rows matched: 1  Changed: 1  Warnings: 0

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

mysql> update tab_json set data = json_set(data,"$.passcode","654567") where id = 1;  #对id为1的passcode字段进行修改,发现没有这个键值,就增加了一个键值对.
Query OK, 1 row affected (0.00 sec)
Rows matched: 1  Changed: 1  Warnings: 0

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

mysql> update tab_json set data = json_set(data,"$.olds","12") where id = 2;
Query OK, 1 row affected (0.17 sec)
Rows matched: 1  Changed: 1  Warnings: 0

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

mysql> update tab_json set data = json_set(data,"$.age","33");
Query OK, 2 rows affected (0.02 sec)
Rows matched: 2  Changed: 2  Warnings: 0

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)

备注:以上就是通过json_set进行对json字段的键值进行修改,如果存在就进行替换,如果不存在键值,就增加键值对.

 

文档创建时间:2018年6月5日21:59:18