mysql5.7之json格式與json_extract方法使用

數據初始化

json_test表數據，id和jsonstr字段(類型json)

 

{
    "no": "7",
    "title": "運動方式",
    "content": [{
        "text": "您平時經常進行的運動及時間",
        "item1": [{
            "text": "慢跑 / 快走 / 走跑結合",
            "type": "select",
            "value": "selected"
        }, {
            "text": "上下樓梯 / 爬山",
            "type": "multselect",
            "value": "selected"
        }],
        "item2": [{
            "text": "慢跑222走跑結合",
            "type": "text",
            "value": "慢跑2"
        }, {
            "text": "上下樓梯 / 爬山2",
            "type": "number",
            "value": "33"
        }]
    }]
}

select語句

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;

返回結果解析

//json_extract( t.jsonstr, '$.*' )返回：
["7", "運動方式", [{"text": "您平時經常進行的運動及時間", "item1": [{"text": "慢跑 / 快走 / 走跑結合", "type": "select", "value": "selected"}, {"text": "上下樓梯 / 爬山", "type": "multselect", "value": "selected"}], "item2": [{"text": "慢跑222走跑結合", "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：
"運動方式"

//json_extract( t.jsonstr, '$.content' ) AS "content" 返回：
[{"text": "您平時經常進行的運動及時間", "item1": [{"text": "慢跑 / 快走 / 走跑結合", "type": "select", "value": "selected"}, {"text": "上下樓梯 / 爬山", "type": "multselect", "value": "selected"}], "item2": [{"text": "慢跑222走跑結合", "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：
["您平時經常進行的運動及時間", "慢跑 / 快走 / 走跑結合", "上下樓梯 / 爬山", "慢跑222走跑結合", "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”的數據
‘$**.text’	返回所有最底層key=”text”的數據
‘$.content[*].item1[*]’	返回key=content的list的key=item1的list的所有內容

官方文檔

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