MySql的數組類型和默認值

Question

我需要加場像

`setting_notification` = 'a:2:{s:19:"other_notifications";i:1;s:21:"message_notifications";i:0;}' 

ALTER TABLE app_users ADD setting_notification tinytext COLLATE utf8_unicode_ci NOT NULL COMMENT '(DC2Type:array)' 

默認值怎麼能這樣做？

我試試這個

ALTER TABLE app_users 
ADD setting_notification LONGTEXT CHARACTER SET utf8 
DEFAULT 'a:2:{s:19:"other_notifications";i:1;s:21:"message_notifications";i:0;}' 
COMMENT '(DC2Type:array)' 

而且有錯誤

[Err] 1101 - BLOB, TEXT, GEOMETRY or JSON column 'setting_notification' can't have a default value 

，並嘗試像

ALTER TABLE app_users 
ADD setting_notification tinytext 
DEFAULT "a:2:{s:19:\"other_notifications\";i:1;s:21:\"message_notifications\";i:0;}" 
COLLATE utf8_unicode_ci 
NOT NULL COMMENT '(DC2Type:array)' 

仍然有錯誤

[Err] 1101 - BLOB, TEXT, GEOMETRY or JSON column 'setting_notification' can't have a default value 

sql版本

mysql> SELECT VERSION(); 
+-------------------------+ 
| VERSION()    | 
+-------------------------+ 
| 5.7.16-0ubuntu0.16.04.1 | 
+-------------------------+ 
1 row in set (0,01 sec) 

Answer 1

您可以添加一個默認值。爲什麼你使用tinytext而不是varchar？

ALTER TABLE app_users ADD setting_notification varchar(255) DEFAULT "a:2:{s:19:\"other_notifications\";i:1;s:21:\"message_notifications\";i:0;}" COLLATE utf8_unicode_ci NOT NULL COMMENT '(DC2Type:array)'