triggers

问题 I want to add 'a' to the value of input when click a button Here is my code(with jQuery 1.4.4): $("#button").click(function(){ $("#input").trigger("focus"); var e = jQuery.Event("keypress"); e.which = '97'; $("#input").trigger(e); }) However, it seems only to trigger 'focus' event ,but failed to 'keypress'. 回答1: like this?? Sorry, I'm confused with your writings.. $("#button").click(function(){ $("#input").trigger("keypress") // you can trigger keypress like this if you need to.. .val

问题 I have an auction website which let my users place an unlimited amount of autobiddings. To monitor these autobiddings something has to check the database every second. My question is if it is better to use mysql trigger events or to user a cronjob every minute that executes a 60 sec looping php script. If i use the mysql trigger events there will be hundreds of events stacks on eachother, and fired on different times. Is this even possible?? ANd isn't the server load goning to be enourmous. I

问题 I am studying triggers and constraints. And I got a question to use trigger (To be honest, I am not really sure how to use trigger..) Let's say we have a Teachers table. And this teacher table contains teacher_id , ssn , first_name , last_name , class_time for example, |teacher_id|ssn | first_name | last_name | student_number| max_student |1 |1234 | bob | Smith | 25 |25 |2 |1235 | kim | Johnson | 24 |21 |3 |1236 | kally | Jones | 23 |22 and let's say the max number of student number will be

问题 I am trying to create some MySQL code that will invoke a Java program from a trigger. Here is what I have so far: CREATE TRIGGER trig_name after insert ON studentinfo FOR EACH ROW BEGIN END The trigger content would then call the Java program. Is this possible? 回答1: A direct answer: no you can't call a java method from a mysql trigger. If you had an oracle database you could, but not mysql. To do what you want to do with mysql you can make the code that updates the database also notify the

问题 I am trying to create some MySQL code that will invoke a Java program from a trigger. Here is what I have so far: CREATE TRIGGER trig_name after insert ON studentinfo FOR EACH ROW BEGIN END The trigger content would then call the Java program. Is this possible? 回答1: A direct answer: no you can't call a java method from a mysql trigger. If you had an oracle database you could, but not mysql. To do what you want to do with mysql you can make the code that updates the database also notify the

问题 I have some triggers on some tables that perform a function when something is deleted or updated. During a transaction, if the trigger executes and later in the transaction it gets rolled back, does the trigger also get rolled back? 回答1: Yes. So long as the trigger fires as part of the transaction, any changes in makes within the database would also get rolled back. Nitpick - a trigger is a trigger, it will not get rolled back. The effects of the trigger will be. 回答2: OK, a real transaction

问题 I have a datatemplate containing an image that I want to be hidden if the the value of a property in a ViewModel is true. Can anyone tell me why the the xaml below does not work? <Image x:Name="img" Source="..\Images\List_16.png" Margin="0,0,5,0"> <Image.Style> <Style> <Style.Triggers> <DataTrigger Binding="{Binding CurrentListHasPendingChanges}" Value="True"> <Setter Property="Image.Visibility" Value="Hidden" /> </DataTrigger> <DataTrigger Binding="{Binding CurrentListHasPendingChanges}"

问题 I need help in Postgres triggers. I have table with 2 columns: sold boolean; id_shop int; It stores if item is sold, or at which shop its located at. I need a trigger, if I change the "sold" to true, then it also changes the id_shop to NULL (It can't be in shop if sold...) I tried different ways, but it doesn't work or gives an error on update cmd... create or replace function pardota_masina_veikals() RETURNS trigger AS $pardota_masina$ begin IF NEW.sold=true THEN update masinas SET id_shop

问题 Using Oracle, if a column value can be 'YES' or 'NO' is it possible to constrain a table so that only one row can have a 'YES' value? I would rather redesign the table structure but this is not possible. [UDPATE] Sadly, null values are not allowed in this table. 回答1: Use a function-based index: create unique index only_one_yes on mytable (case when col='YES' then 'YES' end); Oracle only indexes keys that are not completely null, and the CASE expression here ensures that all the 'NO' values

问题 I have a stored procedure named insert2Newsletter with parameters (@sex nvarchar(10), @f_name nvarchar(50), @l_name nvarchar(70), @email nvarchar(75), @ip_address nvarchar(50), @hotelID int, @maArt nchar(2)) I want call this stored procedure in an insert trigger. How do I retrieve the corresponding fields from inserted and how do i call insert2Newsletter within the trigger? I tried without success: SET ANSI_NULLS ON GO SET QUOTED_IDENTIFIER ON GO CREATE TRIGGER RA2Newsletter ON [dbo].