關(guān)于mysql中的json解析函數(shù)JSON_EXTRACT

更新時(shí)間：2022年07月05日 10:18:54 作者：Deng_7788

這篇文章主要介紹了關(guān)于mysql中的json解析函數(shù)JSON_EXTRACT講解，具有很好的參考價(jià)值，希望對(duì)大家有所幫助。如有錯(cuò)誤或未考慮完全的地方，望不吝賜教

mysql json解析函數(shù)JSON_EXTRACT

MYSQl自帶的解析函數(shù)JSON_EXTRACT,用JSON_EXTRACT函數(shù)解析出來(lái)的函數(shù)會(huì)包含雙引號(hào)

例子

t_table表里面source字段是以json格式寫(xiě)的值為

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

查詢color不去掉雙引號(hào)，inner_color去掉雙引號(hào)，remark去掉雙引

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

查詢結(jié)果

color	inner_color	remark
“白色”	米色	測(cè)試

mysql5.7 json格式與json_extract方法

數(shù)據(jù)初始化

json_test表數(shù)據(jù)，id和jsonstr字段(類型json)

{
    "no": "7",
    "title": "運(yùn)動(dòng)方式",
    "content": [{
        "text": "您平時(shí)經(jīng)常進(jìn)行的運(yùn)動(dòng)及時(shí)間",
        "item1": [{
            "text": "慢跑 / 快走 / 走跑結(jié)合",
            "type": "select",
            "value": "selected"
        }, {
            "text": "上下樓梯 / 爬山",
            "type": "multselect",
            "value": "selected"
        }],
        "item2": [{
            "text": "慢跑222走跑結(jié)合",
            "type": "text",
            "value": "慢跑2"
        }, {
            "text": "上下樓梯 / 爬山2",
            "type": "number",
            "value": "33"
        }]
    }]
}

select語(yǔ)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;

返回結(jié)果解析

//json_extract( t.jsonstr, '$.*' )返回：
["7", "運(yùn)動(dòng)方式", [{"text": "您平時(shí)經(jīng)常進(jìn)行的運(yùn)動(dòng)及時(shí)間", "item1": [{"text": "慢跑 / 快走 / 走跑結(jié)合", "type": "select", "value": "selected"}, {"text": "上下樓梯 / 爬山", "type": "multselect", "value": "selected"}], "item2": [{"text": "慢跑222走跑結(jié)合", "type": "text", "value": "慢跑2"}, {"text": "上下樓梯 / 爬山2", "type": "number", "value": "33"}]}]]
//json_extract( t.jsonstr, '$.title' ) AS "title"返回：
"運(yùn)動(dòng)方式"
//json_extract( t.jsonstr, '$.content' ) AS "content" 返回：
[{"text": "您平時(shí)經(jīng)常進(jìn)行的運(yùn)動(dòng)及時(shí)間", "item1": [{"text": "慢跑 / 快走 / 走跑結(jié)合", "type": "select", "value": "selected"}, {"text": "上下樓梯 / 爬山", "type": "multselect", "value": "selected"}], "item2": [{"text": "慢跑222走跑結(jié)合", "type": "text", "value": "慢跑2"}, {"text": "上下樓梯 / 爬山2", "type": "number", "value": "33"}]}]
//json_extract( t.jsonstr, '$**.text' ) AS "text" 返回：
["您平時(shí)經(jīng)常進(jìn)行的運(yùn)動(dòng)及時(shí)間", "慢跑 / 快走 / 走跑結(jié)合", "上下樓梯 / 爬山", "慢跑222走跑結(jié)合", "上下樓梯 / 爬山2"]
//json_extract( t.jsonstr, '$.content[*].item1[*]' ) AS "item1" 返回：
[{"text": "慢跑 / 快走 / 走跑結(jié)合", "type": "select", "value": "selected"}, {"text": "上下樓梯 / 爬山", "type": "multselect", "value": "selected"}]

用法解析

‘$.*’	返回全部json
‘$.title’	返回key=”title”的數(shù)據(jù)
‘$**.text’	返回所有最底層key=”text”的數(shù)據(jù)
‘$.content[].item1[]’	返回key=content的list的key=item1的list的所有內(nèi)容

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

以上為個(gè)人經(jīng)驗(yàn)，希望能給大家一個(gè)參考，也希望大家多多支持腳本之家。

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