MySQL is not allowing ON UPDATE CURRENT_TIMESTAMP for a DATETIME field

Question

I have seen a lot of related questions, but I cannot place my finger on this specific question:

I have a MySQL table with both a TIMESTAMP (for when the field was create

Answer 1

MySQL does not allow functions to be used for default DateTime values. (See MySQL Data Type Defaults.)

Answer 2

DATETIME cannot use CURRENT_TIMESTAMP on update. Instead, change it to a TIMESTAMP.

Or, consider using a trigger for this situation: http://dev.mysql.com/doc/refman/5.0/en/trigger-syntax.html

EDIT: As in the comments (thanks @АлександрФишер!), this is no longer the case since MySQL 5.6.5, so another solution is to upgrade your server if possible.

Answer 3

Look my picture.

Set column Filed Type timestamp, Attributes on Update CURRENT_TIMESTAMP & Extra also . No problem after changed the filed type in Database, in my case . But not sure for all case.

Answer 4

INSERT and UPDATE date/time automatically

Works with data type: DATETIME or TIMESTAMP

Tested on: MySQL 5.6.27-2 and MariaDB 10.1.10

---

Stores the current date and time on INSERT

CREATE TABLE table_demo (
    ...
    `CreatedAt` datetime DEFAULT CURRENT_TIMESTAMP
    ...
);

Stores the current date and time on INSERT and UPDATE

CREATE TABLE table_demo (
    ...
    `UpdatedAt` datetime DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
    ... 
);

Stores the current date and time only on UPDATE

NOTE: when INSERT, the default value is '0000-00-00 00:00:00'

CREATE TABLE table_demo (
    ...
    `UpdatedAt` datetime DEFAULT '0000-00-00 00:00:00' ON UPDATE CURRENT_TIMESTAMP
    ...
);

Answer 5

That feature appears to have been introduced in 5.6. Works as expected on my default OS X install.

Reference: Automatic Timestamp Properties Before MySQL 5.6.5

Answer 6

Yeah, and if you change it to timestamp , with neither DEFAULT CURRENT_TIMESTAMP nor ON UPDATE CURRENT_TIMESTAMP, it is the same as specifying both DEFAULT CURRENT_TIMESTAMP and ON UPDATE CURRENT_TIMESTAMP.