mysql 5.7 json 字段类型查找、修改

修改 json 里的数组字段

mysql> set @json = '{"test": [{"name": "laravel"}, {"name": "symfony"}]}';
Query OK, 0 rows affected (0.00 sec)
 
mysql> select json_set(@json, '$.test[0].name', "lumen");
+----------------------------------------------------+
| json_set(@json, '$.test[0].name', "lumen")         |
+----------------------------------------------------+
| {"test": [{"name": "lumen"}, {"name": "symfony"}]} |
+----------------------------------------------------+
1 row in set (0.00 sec)

　　

select、匹配 json 字段

SELECT JSON_EXTRACT(name, "$.id") AS name
FROM table
WHERE JSON_EXTRACT(name, "$.id") > 3

　　

json 字段名有横杠的处理：给字段名加双引号

select json_set(@json, '$."just-test".name', "lumen");

　　

设置值为数组：使用 json_array 函数

set @json = json_set(@json, '$."dash-test"', json_array(1));

　　

设置值为对象：使用 json_object 函数

mysql> set @json = json_set(@json, '$.set_test[0]', json_object('name', 'awks'));
Query OK, 0 rows affected (0.00 sec)
 
mysql> select @json;
+-------------------------------------------------------------------------------------------------------+
| @json                                                                                                 |
+-------------------------------------------------------------------------------------------------------+
| {"test": [{"name": "laravel"}, {"name": "symfony"}], "set_test": [{"name": "awks"}], "dash-test": []} |
+-------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)
 
mysql> 

更多参考资料：

json 字段数据类型：https://dev.mysql.com/doc/refman/5.7/en/json.html

json 相关操作函数：https://dev.mysql.com/doc/refman/5.7/en/json-functions.html