DBA MySQL 2022-07-14

MySQL数据库开发：mysql全面解析json/数组

mysql解析json数组

mysql在5.7开始支持json解析了也可以解析数组哦！

直接上demo

　SELECT Substr(col, 2, Length(col) – 2), Length(col)

         FROM   (SELECT Json_extract(Json_extract(Json_extract(state, “$.tpl”),”$.items”

                            ), “$[0].url”)

               AS col

        FROM   page

        ORDER  BY id DESC

        LIMIT  100) t;

JSON_EXTRACT可以解析sql , tpl就是你json的key值

如果是数组，用$[*].url 或者 $[0].url 获取全部的value 或者某个下标的url

下面这个demo可以直接复制到sql运行

　select JSON_EXTRACT(JSON_EXTRACT(JSON_EXTRACT(‘{“tpl”:{“items”:[{“type”:”image”,”config”:{“expandable”:true,”linkAble”:true},”url”:”https://fs.esf.fangdd.net/test/FiZ0OtkhTZoD7fOtkp55SnuLGiKu.png?imageView2/2/w/750″,”id”:1542348252537},{“type”:”image”,”config”:{“expandable”:true,”linkAble”:true},”url”:”https://fs.esf.fangdd.net/test/FlR1VDQWEzD406NosLFrJUez4g_X.png?imageView2/2/w/750″,”id”:1542348263477},{“type”:”image”,”config”:{“expandable”:true,”linkAble”:true},”url”:”https://fs.esf.fangdd.net/test/FhMuYkWvnoMbv8I1dlQbm1KaX5Kn.png?imageView2/2/w/750″,”id”:1542348269599},{“type”:”image”,”config”:{“expandable”:true,”linkAble”:true},”url”:”https://fs.esf.fangdd.net/test/FlgR4IUNElPbcgjN2re_9A8jX30v.png?imageView2/2/w/750″,”id”:1542348276124},{“type”:”image”,”config”:{“expandable”:true,”linkAble”:true},”url”:”https://fs.esf.fangdd.net/test/FpXF8ETHxU8aqriiKbsYDjnu2Xd5.png?imageView2/2/w/750″,”id”:1542348282561},{“type”:”image”,”config”:{“expandable”:true,”linkAble”:true},”url”:”https://fs.esf.fangdd.net/test/FkUz5m7Jd6kE2slSyreDucozc3XH.png?imageView2/2/w/750″,”id”:1542348288150,”link”:”http://www.baidu.com”}],”bottomItems”:[],”title”:”demo2″,”description”:””,”wxLogo”:””,”bodyStyleInline”:{},”bg”:””,”bgType”:””,”bottomStyleInline”:{},”bottomBg”:””,”bottomBgType”:””,”uuid”:”aaef8dfe-256a-4559-aec9-95d1fcdcf830″,”activeItemsName”:”items”,”activeImgType”:””,”authInfo”:{“role_list”:[{“name”:”test”,”access_key_list”:[]},{“name”:”审核人员”,”access_key_list”:[]}],”city_list”:[],”userId”:3108779,”userName”:”zhangyusheng”,”email”:”zhangyusheng@xxx.com”,”mobile”:”123123″,”trueName”:”张昱升”,”isEmployee”:true}}}’, “$.tpl”), “$.items”), “$[0].url”);

我们来分析一下

原始json为

{
“tpl”:{
“items”:[
{
“type”:”image”,
“config”:{
“expandable”:true,
“linkAble”:true
},
“url”:”https://fs.esf.fangdd.net/test/FiZ0OtkhTZoD7fOtkp55SnuLGiKu.png?imageView2/2/w/750″,
“id”:1542348252537
},
{
“type”:”image”,
“config”:{
“expandable”:true,
“linkAble”:true
},
“url”:”https://fs.esf.fangdd.net/test/FlR1VDQWEzD406NosLFrJUez4g_X.png?imageView2/2/w/750″,
“id”:1542348263477
},
{
“type”:”image”,
“config”:{
“expandable”:true,
“linkAble”:true
},
“url”:”https://fs.esf.fangdd.net/test/FhMuYkWvnoMbv8I1dlQbm1KaX5Kn.png?imageView2/2/w/750″,
“id”:1542348269599
},
{
“type”:”image”,
“config”:{
“expandable”:true,
“linkAble”:true
},
“url”:”https://fs.esf.fangdd.net/test/FlgR4IUNElPbcgjN2re_9A8jX30v.png?imageView2/2/w/750″,
“id”:1542348276124
},
{
“type”:”image”,
“config”:{
“expandable”:true,
“linkAble”:true
},
“url”:”https://fs.esf.fangdd.net/test/FpXF8ETHxU8aqriiKbsYDjnu2Xd5.png?imageView2/2/w/750″,
“id”:1542348282561
},
{
“type”:”image”,
“config”:{
“expandable”:true,
“linkAble”:true
},
“url”:”https://fs.esf.fangdd.net/test/FkUz5m7Jd6kE2slSyreDucozc3XH.png?imageView2/2/w/750″,
“id”:1542348288150,
“link”:”http://www.baidu.com”
}
],
“bottomItems”:[

],
“title”:”demo2″,
“description”:””,
“wxLogo”:””,
“bodyStyleInline”:{

},
“bg”:””,
“bgType”:””,
“bottomStyleInline”:{

},
“bottomBg”:””,
“bottomBgType”:””,
“uuid”:”aaef8dfe-256a-4559-aec9-95d1fcdcf830″,
“activeItemsName”:”items”,
“activeImgType”:””,
“authInfo”:{
“role_list”:[
{
“name”:”test”,
“access_key_list”:[

]
},
{
“name”:”审核人员”,
“access_key_list”:[

]
}
],
“city_list”:[

],
“userId”:3108779,
“userName”:”zhangyusheng”,
“email”:”zhangyusheng@xxx.com”,
“mobile”:”23123″,
“trueName”:”张昱升”,
“isEmployee”:true
}
}
}

$.tpl就是获取tpl这个键key
$[0].url就是获取[{url:1},{url:2}] 这个数组第一个对象的url值也就是1

mysql json字符串解析成对应字段

字段名：mobile ,内容：{"contactName":"段XX","contactJobTitle":"待确认","contactMobile":"131XXXXXXX"}。

解决方法：JSON_EXTRACT

执行SQL：

查询结果：

结果带引号，并不能真正使用。

解决方法：REPLACE

执行SQL：

查询结果：

问题解决。

sql语句：

SELECT

REPLACE (

JSON_EXTRACT (mobile, ‘$.contactName’),

‘”‘,

”

) AS ‘contactName’,

REPLACE (

JSON_EXTRACT (mobile, ‘$.contactMobile’),

‘”‘,

”

) AS ‘contactMobile’,

REPLACE (

JSON_EXTRACT (mobile, ‘$.contactJobTitle’),

‘”‘,

”

) AS ‘contactJobTitle’

FROM

cscw_client

WHERE

id = ‘XXXXXXXXXXXXXXX’