数据库教程:关于mysql中的json解析函数JSON_EXTRACT分享

目录

mysql json解析函数JSON_EXTRACT

例子

mysql5.7 json格式与json_extract方法

数据初始化

select语句

返回结果解析

用法解析

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

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

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

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