![]() ![]() After you have it, you should initialize it with this table id starting date (NOW() is a good choice :) ). You need to store two fields - table name (or whatever value you'd like to keep here as table id) and timestamp. You start by creating a separate table (or maybe you have some other table that can be used for this purpose) which will work like a storage for global variables (here timestamps). If I understand correctly (can't verify it on a server right now), timestamp gets reset after server restart.Īs for real (and, well, costly) solutions, you have Bill Karwin's solution with CURRENT_TIMESTAMP and I'd like to propose a different one, that is based on triggers (I'm using that one). Table is evicted from the InnoDB data dictionary cache. Here are the updated records after the above update command. Timestamps are not persisted when the server is restarted or when the ), if you read MySQL docs, even in current version (8.0) using UPDATE_TIME is not the right option, because: It is the simplest way to achieve what is needed, but even if already enabled in InnoDB (actually docs tell you that you still should get NULL. 13 I need to do something that seems to be very simple: bdd->query ('UPDATE mytable SET aaa \''.aaa.'\', bbb \''.bbb.'\' WHERE name \''.name. | 1 | 1235 | 03:30:20 | SELECT MAX(updated_at) FROM foo Īdmittedly, this requires more storage (4 bytes per row for TIMESTAMP).īut this works for InnoDB tables before 5.7.15 version of MySQL, which INFORMATION_TIME doesn't.Īlthough there is an accepted answer I don't feel that it is the right one. This updates the timestamp even though we didn't mention it in the UPDATE. Mysql> UPDATE foo SET x = 1234 WHERE id = 1 Mysql> INSERT INTO foo VALUES (1, NOW() - INTERVAL 3 DAY), (2, NOW()) Updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP WHERE somecolumnsomevalue Notice the WHERE clause in the UPDATE syntax: The WHERE clause specifies which record or records that should be updated. I'm surprised no one has suggested tracking last update time per row: mysql> CREATE TABLE foo ( Update Data In a MySQL Table Using MySQLi and PDO The UPDATE statement is used to update existing records in a table: UPDATE tablename SET column1value, column2value2.
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