mysql5.7之json格式與json_extract方法使用
阿新 • • 發佈:2019-01-30
資料初始化
json_test表資料,id和jsonstr欄位(型別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”的資料 |
‘$**.text’ | 返回所有最底層key=”text”的資料 |
‘$.content[*].item1[*]’ | 返回key=content的list的key=item1的list的所有內容 |