关于mysql中的json解析函数JSON_EXTRACT

 更新时间:2022年07月05日 10:18:54   作者:Deng_7788  
这篇文章主要介绍了关于mysql中的json解析函数JSON_EXTRACT讲解,具有很好的参考价值,希望对大家有所帮助。如有错误或未考虑完全的地方,望不吝赐教

mysql json解析函数JSON_EXTRACT

MYSQl自带的解析函数JSON_EXTRACT,用JSON_EXTRACT函数解析出来的函数会包含双引号

例子

t_table表里面source字段是以json格式写的值为

{ "info" : { "color" : "白色", "inner_color" : "米色", "number" : "12345678", "registration_date" : "2012-11" },
"accessory" : [ "1", "4", "5", "6", "7", "8", "9", "10" ],
"remark" : "测试"}

查询color不去掉双引号,inner_color去掉双引号,remark去掉双引

select 
source->'$.info.color'  as color,
replace(source->'$.info.inner_color','"','')   as inner_color,
replace(source->'$.remark','"','')   as remark
 from t_table

查询结果

colorinner_colorremark
“白色”米色测试

mysql5.7 json格式与json_extract方法

数据初始化

json_test表数据,id和jsonstr字段(类型json)

{
    "no": "7",
    "title": "运动方式",
    "content": [{
        "text": "您平时经常进行的运动及时间",
        "item1": [{
            "text": "慢跑 / 快走 / 走跑结合",
            "type": "select",
            "value": "selected"
        }, {
            "text": "上下楼梯 / 爬山",
            "type": "multselect",
            "value": "selected"
        }],
        "item2": [{
            "text": "慢跑222走跑结合",
            "type": "text",
            "value": "慢跑2"
        }, {
            "text": "上下楼梯 / 爬山2",
            "type": "number",
            "value": "33"
        }]
    }]
}

select语句

SELECT
    id,
    json_extract( t.jsonstr, '$.*' ),
    json_extract( t.jsonstr, '$.title' ) AS "title",
    json_extract( t.jsonstr, '$.content' ) AS "content" ,
    json_extract( t.jsonstr, '$**.text' ) AS "text" ,
    json_extract( t.jsonstr, '$.content[*].item1[*]' ) AS "item1" 
FROM
    json_test t;

返回结果解析

//json_extract( t.jsonstr, '$.*' )返回:
["7", "运动方式", [{"text": "您平时经常进行的运动及时间", "item1": [{"text": "慢跑 / 快走 / 走跑结合", "type": "select", "value": "selected"}, {"text": "上下楼梯 / 爬山", "type": "multselect", "value": "selected"}], "item2": [{"text": "慢跑222走跑结合", "type": "text", "value": "慢跑2"}, {"text": "上下楼梯 / 爬山2", "type": "number", "value": "33"}]}]]
//json_extract( t.jsonstr, '$.title' ) AS "title"返回:
"运动方式"
//json_extract( t.jsonstr, '$.content' ) AS "content" 返回:
[{"text": "您平时经常进行的运动及时间", "item1": [{"text": "慢跑 / 快走 / 走跑结合", "type": "select", "value": "selected"}, {"text": "上下楼梯 / 爬山", "type": "multselect", "value": "selected"}], "item2": [{"text": "慢跑222走跑结合", "type": "text", "value": "慢跑2"}, {"text": "上下楼梯 / 爬山2", "type": "number", "value": "33"}]}]
//json_extract( t.jsonstr, '$**.text' ) AS "text" 返回:
["您平时经常进行的运动及时间", "慢跑 / 快走 / 走跑结合", "上下楼梯 / 爬山", "慢跑222走跑结合", "上下楼梯 / 爬山2"]
//json_extract( t.jsonstr, '$.content[*].item1[*]' ) AS "item1" 返回:
[{"text": "慢跑 / 快走 / 走跑结合", "type": "select", "value": "selected"}, {"text": "上下楼梯 / 爬山", "type": "multselect", "value": "selected"}]

用法解析

‘$.*’返回全部json
‘$.title’返回key=”title”的数据
‘$**.text’返回所有最底层key=”text”的数据
‘$.content[*].item1[*]’返回key=content的list的key=item1的list的所有内容

官方文档:https://dev.mysql.com/doc/refman/5.7/en/json.html

以上为个人经验,希望能给大家一个参考,也希望大家多多支持脚本之家。

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