列名未将时间戳作为默认值

Question

我在同一个 table 中有两列 created_at 和 updated_at。两列的数据类型均为 datetime。现在，当我尝试按如下方式修改列数据类型时 -

alter table nodestatics modify column updated_at datetime default current_timestamp; 

alter table nodestatics modify column created_at datetime default current_timestamp;

显示以下错误

Error Code : 1067 Invalid default value for 'updated_at' (0 ms taken)

Error Code : 1067 Invalid default value for 'created_at' (0 ms taken)

我的mysql版本是5.5.41-0ubuntu0.14.04.1 (Ubuntu)

Answer 1

很难在评论中引用 documentation：

As of MySQL 5.6.5, TIMESTAMP and DATETIME columns can be automatically initializated and updated to the current date and time (that is, the current timestamp). Before 5.6.5, this is true only for TIMESTAMP, and for at most one TIMESTAMP column per table.

要么升级到 5.6.5。或者使用 TIMESTAMP 而不是 DATETIME.

Answer 2

试试这个

alter table nodestatics modify column created_at timestamp default current_timestamp;

Answer 3

使用TIMESTAMP代替DATETIME

应该是这样的：

ALTER TABLE nodestatics MODIFY COLUMN updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP;

ALTER TABLE nodestatics MODIFY COLUMN created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP;

或者您可以使用 TRIGGERS.

CREATE TRIGGER myTable_OnInsert BEFORE INSERT ON `tblMyTable`
    FOR EACH ROW SET NEW.dateAdded = NOW();

你可以看看similar topic。编码愉快！

列名未将时间戳作为默认值

Column name is not taking timestamp as default value

mysql

sql

mysql-error-1067