Triggers have special INSERTED and DELETED tables to track “before” and “after” data. So you can use something like IF EXISTS (SELECT * FROM DELETED) to detect an update. You only have rows in DELETED on update, but there are always rows in INSERTED. Look for “inserted” in CREATE TRIGGER. Edit, 23 Nov 2011 After … Read more
As of MySQL 5.5, you can use the SIGNAL syntax to throw an exception: signal sqlstate ‘45000’ set message_text=”My Error Message”; State 45000 is a generic state representing “unhandled user-defined exception”. Here is a more complete example of the approach: delimiter // use test// create table trigger_test ( id int not null )// drop trigger … Read more
Alternatively, if you are wanting to disable all triggers, not just those on the USER table, you can use: SET session_replication_role = replica; This disables triggers for the current session. To re-enable for the same session: SET session_replication_role = DEFAULT; Source: http://koo.fi/blog/2013/01/08/disable-postgresql-triggers-temporarily/
The main problems with triggers are They are completely Global – they apply no matter what the context of the table activity; They are stealthy; it’s easy to forget they are there until they hurt you with unintended (and very mysterious) consequences. This just means they need to be carefully used for the proper circumstances; … Read more
You can use jQuery special events for this. In all simplicity, Setup: (function($){ $.event.special.destroyed = { remove: function(o) { if (o.handler) { o.handler() } } } })(jQuery) Usage: $(‘.thing’).bind(‘destroyed’, function() { // do stuff }) Addendum to answer Pierre and DesignerGuy’s comments: To not have the callback fire when calling $(‘.thing’).off(‘destroyed’), change the if condition … Read more
Here’s one way: SELECT sysobjects.name AS trigger_name ,USER_NAME(sysobjects.uid) AS trigger_owner ,s.name AS table_schema ,OBJECT_NAME(parent_obj) AS table_name ,OBJECTPROPERTY( id, ‘ExecIsUpdateTrigger’) AS isupdate ,OBJECTPROPERTY( id, ‘ExecIsDeleteTrigger’) AS isdelete ,OBJECTPROPERTY( id, ‘ExecIsInsertTrigger’) AS isinsert ,OBJECTPROPERTY( id, ‘ExecIsAfterTrigger’) AS isafter ,OBJECTPROPERTY( id, ‘ExecIsInsteadOfTrigger’) AS isinsteadof ,OBJECTPROPERTY(id, ‘ExecIsTriggerDisabled’) AS [disabled] FROM sysobjects INNER JOIN sysusers ON sysobjects.uid = sysusers.uid INNER … Read more
If you want to trigger the keypress or keydown event then all you have to do is: var e = jQuery.Event(“keydown”); e.which = 50; // # Some key code value $(“input”).trigger(e);
If you are trying to trigger an event on the anchor, then the code you have will work I recreated your example in jsfiddle with an added eventHandler so you can see that it works: $(document).on(“click”, “a”, function(){ $(this).text(“It works!”); }); $(document).ready(function(){ $(“a”).trigger(“click”); }); Are you trying to cause the user to navigate to a … Read more
onchange only fires when the user types into the input and then the input loses focus. You can manually call the onchange event using after setting the value: $(“#mytext”).val( 777 ).change(); // someObject.onchange(); in standard JS Alternatively, you can trigger the event using: $(“#mytext”).val( 777 ).trigger(“change”);
Note: the initEvent method is now deprecated. Other answers feature up-to-date and recommended practice. You can use fireEvent on IE 8 or lower, and W3C’s dispatchEvent on most other browsers. To create the event you want to fire, you can use either createEvent or createEventObject depending on the browser. Here is a self-explanatory piece of … Read more