mysql json解析函数JSON_EXTRACT
MYSQl自带的解析函数JSON_EXTRACT,用JSON_EXTRACT函数解析出来的函数会包含双引号
例子
t_table表里面source字段是以json格式写的值为
{ “info” : { “color” : “白色”, “inner_color” : “米色”, “number” : “12345678”, “registration_date” : “2012-11” },
“accessory” : [ “1”, “4”, “5”, “6”, “7”, “8”, “9”, “10” ],
“remark” : “测试”}
查询color不去掉双引号，inner_color去掉双引号，remark去掉双引
select
source->’$.info.color’ as color,
replace(source->’$.info.inner_color’,'”‘,”) as inner_color,
replace(source->’$.remark’,'”‘,”) as remark
from t_table
查询结果
| color | inner_color | remark |
|---|
| “白色” | 米色 | 测试 |
mysql5.7 json格式与json_extract方法
数据初始化
json_test表数据，id和jsonstr字段(类型json)
{
“no”: “7”,
“title”: “运动方式”,
“content”: [{
“text”: “您平时经常进行的运动及时间”,
“item1”: [{
“text”: “慢跑 / 快走 / 走跑结合”,
“type”: “select”,
“value”: “selected”
}, {
“text”: “上下楼梯 / 爬山”,
“type”: “multselect”,
“value”: “selected”
}],
“item2”: [{
“text”: “慢跑222走跑结合”,
“type”: “text”,
“value”: “慢跑2”
}, {
“text”: “上下楼梯 / 爬山2”,
“type”: “number”,
“value”: “33”
}]
}]
}
select语句
SELECT
id,
json_extract( t.jsonstr, ‘$.*’ ),
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;
返回结果解析
//json_extract( t.jsonstr, ‘$.*’ )返回：
[“7”, “运动方式”, [{“text”: “您平时经常进行的运动及时间”, “item1”: [{“text”: “慢跑 / 快走 / 走跑结合”, “type”: “select”, “value”: “selected”}, {“text”: “上下楼梯 / 爬山”, “type”: “multselect”, “value”: “selected”}], “item2”: [{“text”: “慢跑222走跑结合”, “type”: “text”, “value”: “慢跑2”}, {“text”: “上下楼梯 / 爬山2”, “type”: “number”, “value”: “33”}]}]]
//json_extract( t.jsonstr, ‘$.title’ ) AS “title”返回：
“运动方式”
//json_extract( t.jsonstr, ‘$.content’ ) AS “content” 返回：
[{“text”: “您平时经常进行的运动及时间”, “item1”: [{“text”: “慢跑 / 快走 / 走跑结合”, “type”: “select”, “value”: “selected”}, {“text”: “上下楼梯 / 爬山”, “type”: “multselect”, “value”: “selected”}], “item2”: [{“text”: “慢跑222走跑结合”, “type”: “text”, “value”: “慢跑2”}, {“text”: “上下楼梯 / 爬山2”, “type”: “number”, “value”: “33”}]}]
//json_extract( t.jsonstr, ‘$**.text’ ) AS “text” 返回：
[“您平时经常进行的运动及时间”, “慢跑 / 快走 / 走跑结合”, “上下楼梯 / 爬山”, “慢跑222走跑结合”, “上下楼梯 / 爬山2”]
//json_extract( t.jsonstr, ‘$.content[*].item1[*]’ ) AS “item1” 返回：
[{“text”: “慢跑 / 快走 / 走跑结合”, “type”: “select”, “value”: “selected”}, {“text”: “上下楼梯 / 爬山”, “type”: “multselect”, “value”: “selected”}]
用法解析
| ‘$.*’ | 返回全部json |
| ‘$.title’ | 返回key=”title”的数据 |
| ‘$**.text’ | 返回所有最底层key=”text”的数据 |
| ‘$.content[*].item1[*]’ | 返回key=content的list的key=item1的list的所有内容 |
官方文档：https://dev.mysql.com/doc/refman/5.7/en/json.html
以上为个人经验，希望能给大家一个参考，也希望大家多多支持。
