triggers

问题 I want to assign the same command to all my buttons on my user control. I use MVVM Light and I have tried all combinations. I have also tried to use EventSetter, but this does not allow binding to a command in the ViewModel Here is a sample of what I am trying to do: <Style x:Key="CalculatorButton" TargetType="telerik:RadButton"> <Setter Property="Margin" Value="2"/> <Setter Property="Cursor" Value="Hand"/> <Style.Triggers> <i:EventTrigger EventName="Click"> <cmd:EventToCommand Command="

问题 can we create trigger and transactions on temporary tables? when user will insert data then , if it is committed then the trigger would be fired , and that data would go from the temporary table into the actual tables. and when the SQL service would stop, or the server would be shutdown, then the temporary tables would be deleted automatically. or shall i use an another actual table , in which first the data would be inserted and then if it is committed then the trigger would be fired and the

问题 Our server has MANY tasks in Task Scheduler that run on varying schedules. I need to be notified by email only when one particular tasks completes. Seeing that the appropriate Event ID for a successfully completed task is 102, I was able to create an event that would email me whenever any task completed, ensuring that my emailing action is properly configured. My problem comes into play when I'm trying to get this email to be triggered for my task called 'Email Parser' ONLY, and I believe I

问题 This is a follow up based on this question about query optimization. In order to make fast selection, as suggested, I tried to pre-compute some data at insertion time using a trigger. Basically, I want to keep the number of occurrences of a given column's value into a given table. The following schema is used to store the occurrences for each of the values: CREATE TABLE valuecount (value text, count int) CREATE INDEX countidx ON t (count DESC) CREATE UNIQUE INDEX valueidx ON valuecount (value

问题 I am using MySQL 5.5. I need to add a Trigger to my table using mysql trigger syntax: http://dev.mysql.com/doc/refman/5.0/en/trigger-syntax.html The example they have given doesn't explain how I can go about doing this - I have a table - table(a INT, b INT, c INT); . field a and b are numbers, while field c should be a + b . Now i'm sure you are wondering why not just slap this in a view and be done with it, or why not put this in my code. The reason is because I am working with a client that

问题 I have two tables that have a column named id_user in common. These two tables are created in my Drupal webpage at some point (that I don't know because I didn't created the Netbeans project). I checked on the internet and found that probably by adding REFERENCES 1sttable (id_user) to the second table, it should copy the value of the 1sttable (that is always created when a new user arrives) to the id_user value of the 2ndtable (that I don't know at which point is created). Is it correct? If

问题 I have two tables that have a column named id_user in common. These two tables are created in my Drupal webpage at some point (that I don't know because I didn't created the Netbeans project). I checked on the internet and found that probably by adding REFERENCES 1sttable (id_user) to the second table, it should copy the value of the 1sttable (that is always created when a new user arrives) to the id_user value of the 2ndtable (that I don't know at which point is created). Is it correct? If

问题 I'm trying to set up a series of history triggers to automatically collect history for a given table via triggers. I want to use triggers as this guarantees I capture all changes regardless if someone forgets about saving it in the app. My problem is that I have this trigger. CREATE TRIGGER `db`.`delete_history_trigger` BEFORE DELETE ON `db`.`payments` FOR EACH ROW BEGIN INSERT INTO `payments_history` select *, 'delete', NOW(), USER() from `payments` where `PAYMENT_ID` = OLD.`PAYMENT_ID`; END

问题 How do I include the columns I need to monitor? I.e. instead of one WHEN condition I want to have 3 WHEN conditions: CREATE TRIGGER freeradius.insert_into_day_summations BEFORE INSERT ON freeradius.day_guiding_usage FOR EACH ROW WHEN (OLD.col1 IS DISTINCT FROM NEW.col1) WHEN (OLD.col2 IS DISTINCT FROM NEW.col2) WHEN (OLD.col3 IS DISTINCT FROM NEW.col3) EXECUTE procedure update_sessioninfo(); 回答1: Form a single expression with OR or AND - depending on whether you want to trigger when all

问题 I wrote a trigger that updates local table and similar table on linked server. CREATE TRIGGER myTtableUpdate ON myTable AFTER UPDATE AS IF (COLUMNS_UPDATED() > 0) BEGIN DECLARE @retval int; BEGIN TRY EXEC @retval = sys.sp_testlinkedserver N'my_linked_server'; END TRY BEGIN CATCH SET @retval = sign(@@error); END CATCH; IF (@retval = 0) BEGIN UPDATE remoteTable SET remoteTable.datafield = i.datafield FROM my_linked_server.remote_database.dbo.myTable remoteTable INNER JOIN inserted i ON