如果包含字符串的json文档，如何从MySQL(5.6)列获取值 [英] How to get values from MySQL(5.6) column if that contains json document as string

问题描述

如果MySQL(5.6)列包含JSON文档作为字符串，如何从MySQL(5.6)列获取值

How to get values from MySQL(5.6) column if that contains JSON document as a string

例如，如果我们有一个表-员工，那么我们有三列 ID，姓名和学历. 列教育包含数据作为JSON文档

For example, if we have a table - employee in that we have three columns id, name and educations. and column educations contains data as a JSON document

{"ug":"bsc","pg":"mca","ssc":"10th"}

我需要教育"列中的ug和pg值

I need the value of ug and pg from educations column

我们可以使用MySQL(5.6)查询吗?

Can we do that using MySQL(5.6) queries?

推荐答案

要能够做您想做的事，您需要MySQL 5.7.8+.从5.7.8版本开始，您可以使用JSON_EXTRACT函数从JSON字符串中提取值:

To be able to do what you want to, you need MySQL 5.7.8+. Since 5.7.8 you can use JSON_EXTRACT function to extract a value from a JSON string:

SELECT JSON_EXTRACT('{"id": 14, "name": "Aztalan"}', '$.name');

+---------------------------------------------------------+
| JSON_EXTRACT('{"id": 14, "name": "Aztalan"}', '$.name') |
+---------------------------------------------------------+
| "Aztalan"                                               |
+---------------------------------------------------------+

来自此处.

在MySQL 5.6中，您只是无法获得所需的值，因为MySQL对JSON对象是什么一无所知.因此，您的选择是:

In MySQL 5.6 you just can't get the value you want as MySQL doesn't know anything about what a JSON object is. So your options are:

• 升级到5.7.8 +
• 使用可处理JSON的内容解析查询结果:
  • 可以是PHP json_decode (或您所用语言的等效语言)
  • 一种在线工具，例如 http://json.parser.online.fr/
  • Upgrade to 5.7.8+
  • Parse the query result with something that handles JSON:
    • Could be PHP json_decode (or equivalent in your language)
    • An online tool like http://json.parser.online.fr/

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