MySQL ???? CURRENT_TIMESTAMP? ??? ?? TIMESTAMP ?? ?? ? ?????
Nov 30, 2024 am 08:35 AM
DEFAULT ?? ON UPDATE ??? CURRENT_TIMESTAMP? ?? ??? TIMESTAMP ?? ??
MySQL? ?? ??? ???? ??? ???? ??? TIMESTAMP ?? ??? ??????. DEFAULT ?? ON UPDATE ?? CURRENT_TIMESTAMP. ??? ?? ??? MySQL??? ? ??? ???????.
??? ??:
?? ??? ??? ?????.
CREATE TABLE `foo` ( `ProductID` INT(10) UNSIGNED NOT NULL, `AddedDate` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP, `UpdatedDate` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP );
? ???? ????? ?? ??? ?? ??? ?????. ??:
Error Code : 1293 Incorrect table definition; there can be only one TIMESTAMP column with CURRENT_TIMESTAMP in DEFAULT or ON UPDATE clause
MySQL 5.6.5 ??? ?? ??:
MySQL 5.6.5?? ? ??? ???????. ?? ?? TIMESTAMP ?? DATETIME ?? DEFAULT CURRENT_TIMESTAMP ? ON UPDATE CURRENT_TIMESTAMP ?? ?? ??? ?? ? ????.
MySQL 5.6.5 ??? ??? ??:
Previously, at most one TIMESTAMP column per table could be automatically initialized or updated to the current date and time. This restriction has been lifted. Any TIMESTAMP column definition can have any combination of DEFAULT CURRENT_TIMESTAMP and ON UPDATE CURRENT_TIMESTAMP clauses.
??? ??? ??? ??? ?? ??? ??? ????? ??? ? ????:
CREATE TABLE `foo` ( `ProductID` INT(10) UNSIGNED NOT NULL, `AddedDate` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP, `UpdatedDate` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP );
? ??? MySQL ???? CURRENT_TIMESTAMP? ??? ?? TIMESTAMP ?? ?? ? ?????? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!
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