triggers

问题 What are the different triggers in WPF? How do they differ and when should I use them? I've seen the following triggers: Trigger DataTrigger MultiTrigger MultiDataTrigger EventTrigger 回答1: A Trigger is typically used in a Style or ControlTemplate. It triggers on properties of the thing being templated, and sets other properties of the control (or of specific template elements). For example, you would use a Trigger on IsMouseOver to respond to the mouse being over the control, and the setters

问题 Whenever INSERT is happened in the CUSTOMER table,I need to call the " StoredProcedure1 "and UPDATE is happend in the CUSTOMER table,I need to call the " StoredProcedure2 " in the Trigger. How to determine if insert or update in the trigger from SQL Server 2008. Some one can please help me how to solve? Code: CREATE TRIGGER Notifications ON CUSTOMER FOR INSERT,UPDATE AS BEGIN DECLARE @recordId varchar(20); set @recordId= new.Id; //if trigger is insert at the time I call to SP1 EXEC

问题 I'm a rank beginner with WPF and I don't even know where to look to find the answer to this question. This XAML seems very straightforward to me: <Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"> <Grid> <Button> <Button.Style> <Style TargetType="{x:Type Button}"> <Style.Triggers> <Trigger Property="IsMouseOver" Value="True"> <Setter Property="Background" Value="Green"/> </Trigger> </Style.Triggers> </Style> </Button

问题 i have two tables Order(id, date, note) and Delivery(Id, Note, Date) I want to create a trigger that updates the date in Delivery when the date is updated in Order. I was thinking to do something like CREATE OR REPLACE TRIGGER your_trigger_name BEFORE UPDATE ON Order DECLARE BEGIN UPDATE Delivery set date = ??? where id = ??? END; How do I get the date and row id? thanks 回答1: How do i get the date and row id? Assuming these are columns on your ORDER table called DELIVERY_DATE and ID your

问题 I have a trigger in which I want to have a variable that holds an INT I get from a SELECT , so I can use it in two IF statements instead of calling the SELECT twice. How do you declare/use variables in MySQL triggers? 回答1: 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

问题 This is with Microsoft SQL Server 2008. I've got 2 tables, Employee and EmployeeResult and I'm trying to write a simple INSERT trigger on EmployeeResult that does this - each time an INSERT is done into EmployeeResult such as: (Jack, 200, Sales) (Jane, 300, Marketing) (John, 400, Engineering) It should look up for the Name, Department entry pairs, such as (Jack, Sales), (Jane, Marketing), (John, Engineering) within the Employee table, and if such an employee does not exist, should insert that

问题 This is with Microsoft SQL Server 2008. I've got 2 tables, Employee and EmployeeResult and I'm trying to write a simple INSERT trigger on EmployeeResult that does this - each time an INSERT is done into EmployeeResult such as: (Jack, 200, Sales) (Jane, 300, Marketing) (John, 400, Engineering) It should look up for the Name, Department entry pairs, such as (Jack, Sales), (Jane, Marketing), (John, Engineering) within the Employee table, and if such an employee does not exist, should insert that

问题 I'm using entity framework 4 , on inserting a new record using entity framework in a table that have instead of insert trigger while the table has an identity column , the instead of trigger is used to modify one of the inserted value according to certain logic ,Entity framework raises exception "Store update, insert, or delete statement affected an unexpected number of rows (0). Entities may have been modified or deleted since entities were loaded. Refresh ObjectStateManager entries". Can

问题 I need help with creating a view and then triggers for the following: update salesperson commission(10% of sale), inventory quantity, and customer balance when each invoice line item is entered. This is what I have right now for the view: I got it working but it shows me that i have error in line 8: CREATE TABLE CUSTOMER (CUSTOMER_ID DECIMAL(2,0) PRIMARY KEY, CUSTOMER_NAME CHAR(25), CUSTOMER_ADDRESS CHAR(15), CUSTOMER_ZIPCODE DECIMAL(5,0), CUSTOMER_CITY CHAR(15), CUSTOMER_STATE CHAR(2),

问题 I need help with creating a view and then triggers for the following: update salesperson commission(10% of sale), inventory quantity, and customer balance when each invoice line item is entered. This is what I have right now for the view: I got it working but it shows me that i have error in line 8: CREATE TABLE CUSTOMER (CUSTOMER_ID DECIMAL(2,0) PRIMARY KEY, CUSTOMER_NAME CHAR(25), CUSTOMER_ADDRESS CHAR(15), CUSTOMER_ZIPCODE DECIMAL(5,0), CUSTOMER_CITY CHAR(15), CUSTOMER_STATE CHAR(2),