triggers

问题 I ran into a problem as I tried to create two TIMESTAMP columns in my database. One called created and one called updated . I figured it would be easy to set the default value of both to CURRENT_TIMESTAMP and then ON UPDATE CURRENT_TIMESTAMP for the updated column. But for some reason MySQL means that's a bad idea... so I have been looking for ways to do this without having to set one of them in the insert query. I found one way by using a trigger in this answer, but I keep getting errors. I

问题 I'm trying to create a trigger on a table in my Amazon RDS database, and I can't seem to make it happen. I tried to create a trigger on a table in the mysql client I use (Navicat), and got the error that I needed the SUPER privilege to do so. After some searching, I found that you could SET GLOBAL log_bin_trust_function_creators = 1 to get around this. I tried that using these instructions: http://getasysadmin.com/2011/06/amazon-rds-super-privileges/ (and then restarting the DB server for

问题 I'm using a Google script then sends out an email when a certain column in a Google sheet is changed. The information in the cell is either inputted manually, or completes using a formula based on information in other cells. The script works fine when information is manually entered, but not when the formula runs. I've read up on it and realise that a formula calculation doesn't count as an edit, so how do I get the script to run? It's currently set up to trigger from the spreadsheet when

问题 I have two tables batch (batch_id,start_date,end_date,batch_strength,is_locked) sem (user_id,is_active,no_of_days) I have executed the trigger procedure given below then update the table using query CREATE OR REPLACE FUNCTION em_batch_update() RETURNS trigger AS $em_sem_batch$ BEGIN UPDATE batch set is_locked='TRUE' where (start_date + (select no_of_days from sem WHERE is_active='TRUE' and user_id='OSEM') ) <= current_date; return NEW; END; $em_sem_batch$ LANGUAGE plpgsql; CREATE TRIGGER em

问题 I am trying to generate an error message using the MySQL trigger. Below is my code: DELIMITER $$ CREATE TRIGGER `test_before_insert` BEFORE INSERT ON `Initial_Fees` FOR EACH ROW BEGIN IF ((SELECT Activation from Portfolio WHERE idPortfolio = New.idPortfolio)=false) THEN SIGNAL SQLSTATE '45000'; SET MESSAGE_TEXT := 'Disabled Thing'; END IF; END$$ DELIMITER ; But this always generates an error. I don't know what the error is, because It is not saying anything about the error, it is just "Error"

问题 For some reason I can't find the exact answer that I need. I searched for at last 20 minutes in here. I know it's simple. VERY simple. But I can't fire the trigger for some reason.. I have a table with two columns dbo.HashTags |__Id_|_name_| | 1 | Love | I want to insert the deleted values into another table called dbo.HashTagsArchive on a DELETE query. Example: DELETE FROM [dbo].[HashTags] WHERE Id=1 After this example I should have the deleted row in dbo.HashTagsArchive and the row with Id

问题 I want to add a field-level validation on a table. There is a field named "account_number" and this field should always pass a "luhn" check. I've found a function called "luhn_verify" that seems to work properly (google for it if you are interested). It returns a boolean. My question is: Are there any major performance advantages in PostgreSQL for using a trigger for this validation vs. a check constraint. Additional information: PostgreSQL 9.1 Table does not currently have an insert trigger,

问题 I have the table Tb ID | Name | Desc ------------------------- 1 | Sample | sample desc I want to create a trigger on INSERT that will change the value of the inserting Desc , for example: INSERT INTO Tb(Name, Desc) VALUES ('x', 'y') Will result in ID | Name | Desc ------------------------- 1 | Sample | sample desc 2 | x | Y edited In the above example I got the value of the inserting Desc changed it to uppercase and added edited on the end. That's what I need, get the Desc that is being

问题 I have the table Tb ID | Name | Desc ------------------------- 1 | Sample | sample desc I want to create a trigger on INSERT that will change the value of the inserting Desc , for example: INSERT INTO Tb(Name, Desc) VALUES ('x', 'y') Will result in ID | Name | Desc ------------------------- 1 | Sample | sample desc 2 | x | Y edited In the above example I got the value of the inserting Desc changed it to uppercase and added edited on the end. That's what I need, get the Desc that is being

问题 Is it possible to trigger for example flash uploading button via javascript? For example I have made empty image wrappers and by clicking on them, they trigger flash button to open as select window. Thanks! 回答1: Assuming you have a flash function in your SWF, like this: // AS3 code in swf function myfunction():void { // Do something useful } You can expose it to JavaScript in a page that contains your SWF like this: // AS3 code in swf ExternalInterface.addCallback("myfunction", myfunction);