zoukankan      html  css  js  c++  java
  • 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?

    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

  • 相关阅读:
    知识工程及语义网技术 2020-03-19 (第一节)-构建本体
    知识工程及语义网技术 2020-03-12 (第二节)-构建本体
    知识工程及语义网技术 2020-03-12 (第二节)、RDF(S)、OWL
    知识工程及语义网技术(一)-XML、RDF(S)、OWL-2020.3.5第一节
    知识工程及语义网技术(一)-知识工程,万维网、语义网、本体工程 2020-02-20 (第一节)
    本体
    语义网技术及其应用(四)-欧石燕
    一文深度揭秘3GPP:2G/3G/4G/Pre-5G标准化制定流程是这样的
    3GPP更新5G标准时间表
    一张图了解3GPP
  • 原文地址:https://www.cnblogs.com/chuanzhang053/p/9142180.html
Copyright © 2011-2022 走看看