mysql解析json 陣列

mysql在5.7開始支援json解析了 也可以解析陣列哦！

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;

如果是陣列，用$[*].url  或者 $[0].url  獲取全部的value 或者某個下標的url

下面這個demo可以直接複製到sql執行:

select json_extract(json_extract(json_extract(',"url":"","id":1542348252537},,"url":"","id":1542348263477},,"url":"","id":1542348269599},,"url":"","id":1542348276124},,"url":"","id":1542348282561},,"url":"","id":1542348288150,"link":""}],"bottomitems":,"title":"demo2","description":"","wxlogo":"","bodystyleinline":{},"bg":"","bgtype":"","bottomstyleinline":{},"bottombg":"","bottombgtype":"","uuid":"aaef8dfe-256a-4559-aec9-95d1fcdcf830","activeitemsname":"items","activeimgtype":"","authinfo":,],"city_list":,"userid":3108779,"username":"zhangyusheng","email":"zhangyusheng@***.com","mobile":"123123","truename":"張昱公升","isemployee":true}}}', "$.tpl"), "$.items"), "$[0].url");

原始json為

,

"url":"",
"id":1542348252537},,
"url":"",
"id":1542348263477},,
"url":"",
"id":1542348269599},,
"url":"",
"id":1542348276124},,
"url":"",
"id":1542348282561},,
"url":"",
"id":1542348288150,
"link":""}],
"bottomitems":[
],"title":"demo2",
"description":"",
"wxlogo":"",
"bodystyleinline":,
"bg":"",
"bgtype":"",
"bottomstyleinline":,
"bottombg":"",
"bottombgtype":"",
"uuid":"aaef8dfe-256a-4559-aec9-95d1fcdcf830",
"activeitemsname":"items",
"activeimgtype":"",
"authinfo":,
],"city_list":[
],"userid":3108779,
"username":"zhangyusheng",
"email":"zhangyusheng@***.com",
"mobile":"23123",
"truename":"張昱公升",
"isemployee":true}}
}

$[0].url  就是獲取[,] 這個陣列第乙個物件的url值 也就是1

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