MSSQL does not support BEFORE triggers. The closest you have is INSTEAD OF triggers but their behavior is different to that of BEFORE triggers in MySQL. You can learn more about them here, and note that INSTEAD OF triggers “Specifies that the trigger is executed instead of the triggering SQL statement, thus overriding the actions … Read more
You can declare local variables in MySQL triggers, with the DECLARE syntax. Here’s an example: DROP TABLE IF EXISTS foo; CREATE TABLE FOO ( i SERIAL PRIMARY KEY ); DELIMITER // DROP TRIGGER IF EXISTS bar // CREATE TRIGGER bar AFTER INSERT ON foo FOR EACH ROW BEGIN DECLARE x INT; SET x = NEW.i; … Read more
For anyone else who’s up against this problem, I found a solution that works for me. Of course, I’m still interested to see other interesting answers. Here’s what I did: <MultiDataTrigger> <MultiDataTrigger.Conditions> <Condition Binding=”{Binding RelativeSource={ RelativeSource Mode=FindAncestor, AncestorType={x:Type ListBoxItem}}, Path=IsSelected}” Value=”True”/> <Condition Binding=”{Binding IsAvailable}” Value=”False”/> </MultiDataTrigger.Conditions> <Setter TargetName=”Name” Property=”Foreground” Value=”#F00″/> </MultiDataTrigger> There’s nothing special about … Read more
You can write a test function that passes a simulated event to your trigger function. Here’s an example that tests an onEdit() trigger function. It passes an event object with all the information described for “Spreadsheet Edit Events” in Understanding Events. To use it, set your breakpoint in your target onEdit function, select function test_onEdit … Read more
You need to specify the trigger as part of a style — the Triggers collection on the Button itself can only contain event triggers. With that in mind, a DataTrigger works fine. However, there is a wrinkle: the value from the Trigger Setter won’t overwrite a local Content property. So you have to set the … Read more
You can style your ContentControl such that a trigger fires when its container (the ListBoxItem) becomes selected: <ContentControl x:Name=”designerContent” MinHeight=”100″ Margin=”2,0,2,2″ Content=”{Binding Path=DesignerInstance}” Background=”#FF999898″> <ContentControl.Style> <Style TargetType=”{x:Type ContentControl}”> <Setter Property=”Visibility” Value=”Collapsed”/> <Style.Triggers> <DataTrigger Binding=”{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type ListBoxItem}}, Path=IsSelected}” Value=”True”> <Setter Property=”Visibility” Value=”Visible”/> </DataTrigger> </Style.Triggers> </Style> </ContentControl.Style> </ContentControl> Alternatively, I think you can add the … Read more
WPF is processing your triggers in declared order. In the second example the foreground is ever so briefly changed to green. But then the IsMouseOver trigger runs and sets the color back to yellow. IsMouseOver has no relationship to IsPressed in terms of precedence. What’s important is the declaration order in XAML of the triggers.
Using sys.triggers SELECT name, is_disabled FROM sys.triggers
This has been asked many times. A possible solution can be found here: https://stackoverflow.com/a/6527838/552671 This solution requires both an UPDATE and INSERT. UPDATE table SET field=’C’, field2=’Z’ WHERE id=3; INSERT INTO table (id, field, field2) SELECT 3, ‘C’, ‘Z’ WHERE NOT EXISTS (SELECT 1 FROM table WHERE id=3); With Postgres 9.1 it is possible to … Read more