My approach: define a default constraint on the ModDate column with a value of GETDATE() – this handles the INSERT case have a AFTER UPDATE trigger to update the ModDate column Something like: CREATE TRIGGER trg_UpdateTimeEntry ON dbo.TimeEntry AFTER UPDATE AS UPDATE dbo.TimeEntry SET ModDate = GETDATE() WHERE ID IN (SELECT DISTINCT ID FROM Inserted)
You are correct that you need a trigger, because setting a default value for the column won’t work for you – default values only work for null values and don’t help you in preventing blank values. In postgres there are a couple of steps to creating a trigger: Step 1: Create a function that returns … Read more
Most likely you are referring to django’s pre_save signal. You could setup something like this: from django.db.models.signals import pre_save from django.dispatch import receiver from django.template.defaultfilters import slugify @receiver(pre_save) def my_callback(sender, instance, *args, **kwargs): instance.slug = slugify(instance.title) If you dont include the sender argument in the decorator, like @receiver(pre_save, sender=MyModel), the callback will be called for … Read more
You cannot change a table while the INSERT trigger is firing. The INSERT might do some locking which could result in a deadlock. Also, updating the table from a trigger would then cause the same trigger to fire again in an infinite recursive loop. Both of these reasons are why MySQL prevents you from doing … Read more
The trigger is executed on the MySQL server, not on the PHP one (even if those are both on the same machine). So, I would say this is not quite possible — at least not simply. Still, considering this entry from the MySQL FAQ on Triggers : 23.5.11: Can triggers call an external application through … Read more
You can use the expression date_trunc(‘month’, current_date). Demonstrated with a SELECT statement . . . select date_trunc(‘month’, current_date) 2013-08-01 00:00:00-04 To remove time, cast to date. select cast(date_trunc(‘month’, current_date) as date) 2013-08-01 If you’re certain that column should always store only the first of a month, you should also use a CHECK constraint. create table … Read more
Just create your own action. namespace WpfUtil { using System.Reflection; using System.Windows; using System.Windows.Interactivity; /// <summary> /// Sets the designated property to the supplied value. TargetObject /// optionally designates the object on which to set the property. If /// TargetObject is not supplied then the property is set on the object /// to which the … Read more
Database-> Tasks-> Generate Scripts -> Next -> Next On Choose Script Options UI, under Table/View Options Heading, set Script Triggers to True.
As a workaround, you could use the timestamp (old and new) for checking though, that one is not updated when there are no changes to the row. (Possibly that is the source for confusion? Because that one is also called ‘on update’ but is not executed when no change occurs) Changes within one second will … Read more
Update: you can also push an empty commit to your branch to re-trigger status checks: git commit -m “retrigger checks” –allow-empty and then git push <branchname> You can do this by closing and then re-opening the Pull Request. This will cause all status checks to run again on the same commit.