MySQL中查询json格式的字段实例详解

[{
	"cardId": "110101199003072316",
	"cstName": "张双儿1",
	"cstMobile": "13263654144",
	"idCardType": "1"
}, {
	"cardId": "11010119900307571X",
	"cstName": "张双儿2",
	"cstMobile": "13263654144",
	"idCardType": "1"
}]

模糊查询 json 数组格式的字段中某个字段：
使用方式：
SELECT * FROM 表名 WHERE json_extract(字段名,"$[*].json中key") like '%需要搜索的值%';
实例：
SELECT * FROM table WHERE json_extract(sign_customer_info_ext,"$[*].cstName") like '%h%';

精准查询(注意：精准查询必须写明所查询字段所属数组那个下标，比如查排在一个就是 [0],第二个就是 [1])
SELECT id,sign_customer_info_ext FROM table WHERE json_extract(sign_customer_info_ext,"$[0].cstName") = 'ghhj中文1355';

{
	"cstName": "马云",
	"cstMobile": "17879767646",
	"idCardType": "1",
	"cardId": "E4813980"
}

模糊查询单个 json 查询：
使用方式：
SELECT id,sign_customer_info_ext FROM 表名 WHERE json_extract(字段名,"$.json中key") like '%马云%';
实例：
SELECT id,sign_customer_info_ext FROM table WHERE json_extract(sign_customer_info_ext,"$.cstName") like '%马云%';