Is it possible to create a trigger to prevent update of a row if no signifiant colums are updated
Example : I need to allow the update only if colums a,b or c have changes ?
how it should works to keep or discard the update according to condition ?
Hi all,
I'm writing a trigger to prevent duplicates. I know that this can be done through primary key or unique constraints but in the real world my uniqueness is defined by 8 columns which is too a big an index to maintain on the primary / unique key.
If I create a table with 2 columns
CREATE TABLE Table1
(CentreCHAR(10),
Month CHAR(3)
)
Then create a trigger to prevent duplicates
CREATE TRIGGER trigger_Check_Duplicates
ON Table1
FOR INSERT, UPDATE
AS
-- This trigger has been created to check that duplicate rows are not inserted into AudioVisual table.
DECLARE @IsDuplicate INTEGER
-- Check if row exists
SELECT @IsDuplicate = 1
FROM Inserted i, Table1 t
WHERE t.Centre = i.Centre
AND t.Month = i.Month
IF (@IsDuplicate = 1)
-- Display Error and then Rollback transaction
BEGIN
RAISERROR ('This row already exists in the table', 16, 1)
ROLLBACK TRANSACTION
END
Then insert a row into the new table (no other data is in there)
INSERT Table1
VALUES('0691040176','AUG')
I get the Trigger error message that the row already exists. Why is this the case? I though that Table 1 (target table) would show no entries as it has no data - it should be a before image of the table and the inserted table should be an after image.
Please help!!!
Thanks
Neill
Hi,
I have an update tigger on one of my tables.
I want to fire an Update SQL but somehow prevent trigger from firing.
Any Ideas..
I have this table:
CREATE TABLE Workspaces (
AreaNr CHAR(2)
CONSTRAINT ck_a_areanr REFERENCES Areas(AreaNr)
ON DELETE CASCADE
[Code] ....
Now I want to create a trigger that prevents a delete on a single row (randomly chosen) from the table Workspaces. At the moment I have the following trigger, but this trigger still allows removal of single rows.
Current trigger:
CREATE TRIGGER deleteWorkspace ON Workspaces
FOR DELETE AS
BEGIN
DECLARE @Count int
SET @Count = @@ROWCOUNT;
[Code] ....
Desired result: I want to be able to prevent a delete on a single row on the table above.
OK, I know about this: [URL] ....
But the script has "ALL SERVER".
What I want is a trigger that is specific to my DB called "JunkStuff". I only want to block a servername from connect to my super dooper DB "JunkStuff".
When i process a order in table Orders_t i would like to check in storage_t if we defenetly have it in storage. .... if we have it in storage, i decrease the "amount" by 1 ..(amount -1), and process the order. Otherwise it will return nothing.
This is what i´ve come up with so far:
CREATE TRIGGER checkInStorage
ON orders_t
FOR INSERT, UPDATE
AS
DECLARE
@tOrderId char(3),
BEGIN
SET @tOrderId = (SELECT orderId FROM INSERTED)
--check if the amount in storage
IF EXIST(SELECT amount FROM storage_t WHERE orderId = @tOrderId and amount >= 0)
BEGIN --if it return true, i update the storage by decrease the amount with one
UPDATE storage_t
SET (amount = amount - 1)
WHERE orderId = @tOrderId
END
this doesn´t work...
Hello
I noticed a spelling mistake in the data in a column of several tables, I used the following syntax to alter the spelling:
UPDATE [dbo].[Prod_Cat] SET [ProdName]=N'merseyside' WHERE ProdName = 'mmserseyside'
The above code correctly updated the spelling error, but it also inserted a new row with the corrected data.
So I found myself with two Identical rows containing the corrected information. I had to manually delete the extra row. Because if I had put in a DELETE statement, I would have then lost both rows.
What do I need to do to prevent this happening next time. As I find that I need to update the names of some products, but I don't want to duplicate them.
Thanks
Lynn
Hi all!Are there any other way than using rights or Triggers to prevent aDELETE or an UPDATE on a specific column.The "problem" with rights is that they dont apply to all DB-usersThe "problem" with triggers is that they generate lots of extraSQL-codeI would like a solution something like below. If there are anyprimitives like this or other more neat solutions I would be glad toknowCREATE TABLE some_table NO DELETE/* ^^^^^^^^^*/(some_column SOME_TYPE NO UPDATE/* ^^^^^^^^^*/)For clarity, here is a trigger that currently solves the problemCREATE TRIGGER check_updateable_columns ON some_tableFOR UPDATEASIF UPDATE(some_column)RAISERROR(...)GOorCREATE TRIGGER delete_not_allowed ON some_tableINSTEAD OF DELETEASRAISERROR(...)GO
View 1 Replies View RelatedI'm trying to find a way to maintain the data that was UPDATEd in a table from being overwritten.
I used UPDATE in a table to include missing data. However, since I do not have access to the original table from where the data is derived, when I run my query, it knocks out the data in my table that was updated, because it is linked to the orginal table that has the blank fields. A few users do not have an employee email, and this has to be updated with a personal email account for now. Â
My update works fine, but is there a way I can use the statement in my query so that it updates each time it is run to maintain the user email address? This will solve the problem of not having to change the original table that I do not have access to.
if exists (select * test..dbo.Employee)
truncate TABLE
 test.. dbo.Employee
insert into test.. dbo.Employee (EmployeeNumber Â
   , EmplUsername Â
[Code] ....
Hi,
I've got a table containing calculated values, so i created a field named "archived" (bit datatype) on this table, to prevent the values to be updated if this field is set to true.
Is it possible to created a constraint, to prevent the row to be updated if ARCHIVED=true ? How can i do it ?
Are there any limitations or gotchas to updating the same table whichfired a trigger from within the trigger?Some example code below. Hmmm.... This example seems to be workingfine so it must be something with my specific schema/code. We'reworking on running a SQL trace but if anybody has any input, fireaway.Thanks!create table x(Id int,Account varchar(25),Info int)GOinsert into x values ( 1, 'Smith', 15);insert into x values ( 2, 'SmithX', 25);/* Update trigger tu_x for table x */create trigger tu_xon xfor updateasbegindeclare @TriggerRowCount intset @TriggerRowCount = @@ROWCOUNTif ( @TriggerRowCount = 0 )returnif ( @TriggerRowCount > 1 )beginraiserror( 'tu_x: @@ROWCOUNT[%d] Trigger does not handle @@ROWCOUNT[color=blue]> 1 !', 17, 127, @TriggerRowCount) with seterror, nowait[/color]returnendupdate xsetAccount = left( i.Account, 24) + 'X',Info = i.Infofrom deleted, inserted iwhere x.Account = left( deleted.Account, 24) + 'X'endupdate x set Account = 'Blair', Info = 999 where Account = 'Smith'
View 1 Replies View Relatedhi!
I have a big problem. If anyone can help.
I want to retrieve the last update time of database. Whenever any update or delete or insert happend to my database i want to store and retrieve that time.
I know one way is that i have to make a table that will store the datetime field and system trigger / trigger that can update this field record whenever any update insert or deletion occur in database.
But i don't know exactly how to do the coding for this?
Is there any other way to do this?
can DBCC help to retrieve this info?
Please advise me how to do this.
Thanks in advance.
Vaibhav
I have a table where table row gets updated multiple times(each column will be filled) based on telephone call in data.
Â
Initially, I have implemented after insert trigger on ROW level thinking that the whole row is inserted into table will all column values at a time. But the issue is all columns are values are not filled at once, but observed that while telephone call in data, there are multiple updates to the row (i.e multiple updates in the sense - column data in row is updated step by step),
I thought to implement after update trigger , but when it comes to the performance will be decreased for each and every hit while row update.
I need to implement after update trigger that should be fired on column level instead of Row level to improve the performance?
Hi,
I am not sure if this is the right forum to post this question.
I run an update statement like "Update mytable set status='S' " on the SQL 2005 management Studio.
When I run "select * from mytable" for a few seconds all status = "S". After a few seconds all status turn to "H".
This is a behaviour when you have an update trigger for the table. But I don't see any triggers under this table.
What else would cause the database automatically change my update?
Could there be any other place I should look for an update trigger on this table?
Thanks,
Hello
I've to write an trigger for the following action
When a entry is done in the table Adoscat79 having in the index field Statut_tiers the valeur 1 and a date in data_cloture for a customer xyz
all the entries in the same table where the no_tiers is the same as the one entered (many entriers) should have those both field updated
statut_tiers to 1
and date_cloture to the same date as entered
the same action has to be done when an update is done and the valeur is set to 1 for the statut_tiers and a date entered in the field date_clture
thank you for your help
I've never done a trigger before
I have an update trigger which fires from a transactiion table to update a parent record in another table. I am getting no errors, but also no update. Any help appreciated (see script below)
create trigger tr_cmsUpdt_meds on dbo.medisp for UPDATE as
if update(pstat)
begin
update med
set REC_FLAG = 2
from deleted dt
where med.uniq_id = dt.uniq_id
and dt.pstat = 2
and dt.spec_flag = 'kop'
end
I am trying to update a fields with an UPDATE statement but I keep getting the error message when I run the query.
Subquery returned more than 1 value. This is not permitted when the subquery follows =, !=, <, <= , >, >= or when the subquery is used as an expression.
I have this Update trigger that I know is causing the error message because I guess it's not built to manage multi-row updates.
Can someone help me re-write it. I also tried using the WHERE p.ID = p.ID but when I do that it modifies all rows in the modifieddate column instead of just the cells/rows that I'm updating
ALTER TRIGGER [dbo].[MultitrigCA]
ON [dbo].[ProdDesc]
AFTER UPDATE
AS
SET NOCOUNT ON
IF UPDATE (codeabbreviation)
UPDATE p
sET p.ModifiedDate = GETDATE()
FROM ProdDesc AS p
WHERE p.ID = (SELECT ID FROM inserted)
Hi there,I'm a little stuck and would like some helpI need to create an update trigger which will run an update query onanother table.However, What I need to do is update the other table with the changedrecord value from the table which has the trigger.Can someone please show me how this is done please??I can write both queries, but am unsure as to how to get the value ofthe changed record for use in my trigger???Please helpM3ckon*** Sent via Developersdex http://www.developersdex.com ***Don't just participate in USENET...get rewarded for it!
View 1 Replies View Related
hi!
i have a database with about 20 tables. i appended to each table a column "UpdatedOn", and i want to write a trigger to set the date of the update date in that column, using a trigger.
i want to avoid the trigger launching for the last column (UpdatedOn).
how can i detect the rows that changed, and modify only the update date/time?
i read something about TableName_Inserted and TableName_Deleted, but i would prefer to copy as generic as possible the data from there, meaning, not to write column names in my script.
another idea i thought about was to prevent the trigger executing if no other column except for UpdatedOn changed, but... i encounter some trouble, when i try to pass column name (as string) to UPDATE() function.(Error: Expecting ID or QUOTED_ID)
thank you in advance.
Hello All,
I've been adviced without much detail that the best way to handle updates is with an Update Trigger to write to an AuditTable.
I always thought it was better to avoid triggers.
I'm getting confused very fast in reading about triggers.
Could someone please point me in the right direction?
Thank you,
Tina
i am using address table to store the address of employees, agents, students; so can't use cascade update and delete. so i decided to use trigger but i got stuck here as well.
Here employeeid is the PK of employee id. so when it is updated, i want to update that id in corresponding address table as well.
so what i need is to find out the previous value of EmployeeID before updating to use in WHERE clause and new EmployeeID to use in SET clause.
<code>
CREATE TRIGGER [AddressUpdate] ON [dbo].[MCS_Employee]
FOR UPDATE
AS
IF UPDATE(EmployeeID)
BEGIN
UPDATE MCS_Address SET EmployeeID = 'i am stuck here; how to know the previous value?
WHERE EmployeeID = ???
END
</end>
ironically, PK in my table can be updateable as well.
Hello all. I have a table which is the exact replication of a different table. Now if an update takes place in the original table I want to copy that row into the new table without the update.I have this but I am not sure if it works.Create Trigger Content_Archive on content
For Update
As
Insert Into content_audit Select * From DeletedI dont know if Updated exists so I am using Deleted. It is returning both rows (before and after update). And the insert should take place as soon as an update takes place in any field in the content table.
Hello, I have two tables, looks as follow.
TOPIC
------
TOPIC_ID
STATUS_ID
TOPIC
THREAD
-------
THREAD_ID
TOPIC_ID
STATUS_ID
THREAD
THREAD_DATE
NAME
I want to update STATUS_ID in TOPIC when I post a new THREAD.
I guess the best would be to use a trigger?
Don't know much how you write them so if someone please could help or point me in right direction.
My plan is to always show the updated STATUS_ID in TOPIC while I have history in the THREAD TBL.
I am using MS SQL 7.0
Thanks for a great site.
Linkan
Hello,
I am new to this and on my way to learning. I hope someone can help me with a trigger. I want to update status of one table when I insert a new threat in another. This is what I have come up with so far.
CREATE TRIGGER [trg_Update_Status] ON tForumThread
FOR INSERT
AS
BEGIN
UPDATE tJournalTopic (STATUS_ID)
SELECT STATUS_ID
FROM Inserted
Thanks,
Linkan
I need to be able to select the row or specific field that was updated in an update trigger. I dont have any time-stamp or before-after value columns to compare. Please help!
View 4 Replies View RelatedI HAVE TWO TABLES IN THE DATABSE T1 AND THE SECOND TABLE(T2) IS FOR AUDITING.
THE STRUCTURE OF BOTH THE TABLES IS SIMILAR WITH ONE MORE COLUMN 'STATUS' IN THE T2.
I HAVE ALREADY WRITTEN THE TRIGGERS FOR THE INSERT AND DELETE TRIGGERS SO THAT I CAN SAVE THE
RECORD WITH STATUS OF 'NEW INSERT' OR 'DELETE' OR 'UPDATE' IN THE AUDIT TABLE(T2).
HELP ME IN WRITING THE TRIGGER FOR UPDATE.
MY PROBLEM IS I DON'T KNOW HOW TO STORE THE UPDATED COLUMNS VALUES INTO VARIABLES AND SO THAT
I CAN STORE THE OLD VALUES INTO THE AUDIT TABLE(T2).
I M USING SQL SERVER 6.5, SO WE CAN NOT USE COLUMNS_UPDATED() IN THE TRIGGER.
PLEASE SUGGEST ME THE CODE SO THAT I CAN STORE THE OLD ROW IN THE TABLE(T1) TO TABLE (T2)
WITH STATUS 'UPDATE' IN THE T2.
PLEASE SUGGEST ME..ITS URGENT.
THANKS IN ADVANCE
HARISH
=============================
/*test trigger for insert status */
if exists (select * from sysobjects where id = object_id('dbo.tri_t1_insert') and sysstat & 0xf = 8)
drop trigger dbo.tri_t1_insert
GO
CREATE TRIGGER tri_t1_insert ON dbo.t1
FOR INSERT
AS
declare @v1 binary(20),
@v2 varchar(255)
Begin
select @v1=stamp,@v2=name from inserted
insert into t2(stamp,name,status) values(@v1,@v2,'NEW INSERT')
end
GO
========================================
/*test trigger for delete status */
if exists (select * from sysobjects where id = object_id('dbo.tri_t1_delete') and sysstat & 0xf = 8)
drop trigger dbo.tri_t1_delete
GO
CREATE TRIGGER tri_t1_delete ON dbo.t1
FOR delete
AS
declare @v1 binary(20),
@v2 varchar(255)
Begin
select @v1=stamp,@v2=name from deleted
insert into t2(stamp,name,status) values(@v1,@v2,'DELETE')
end
I have an update trigger on a table on my transactional database that inserts a row of data into another database (audit database)for any modification made on the transactional database.
So if i modify a row on tran db it will write the data modified as a new row in the audit db.
This works fine if I am updating only 1 row with each Update statement. However if I update more than 1 row (multiple rows) with the same Update statement, the update trigger only inserts the last row modified in the audit database. So I lose record of any other rows modified with the same update statement.
Is there a way by which i can change my Update trigger or something, so I get all the rows updated by 1 update statement inmy audit database???
Thanks a bunch,
Judy
Hello All,
How do I create an update trigger that only updates the record that is being updated?
TIA,
Terry
well basically i have a table with 3 columns in a table called TEST like:
TEST1 TEST2 TEST3
------- ------- -------
NULL NULL NULL
these columns can allow nulls. What i whant to do with my trigger is do a after trigger and check after the load if a certain column is NULL place a X instead like a flag but only on the columns that are NULL how would i do this.
plz help
Is there a way I can get the old value of a specific field when using an update trigger?
e.g. I want to use the condition 'If Update(Column) '
in odrer to create a logfile which stores the old and new value of a field.
The new value can be get from a Select from Inserted table.
Is there a way I can get the old value (before update) also??
Regards,
Manolis
I have created a table with the following columns Jobnumber varchar(20), weight real(4), freightcost money(8), trackingnumber vchar(50), comments varchar(2000) and voidid varchar(3)
I wrote a trigger that updates this data based on the voidid to update the package table as followed:
CREATE TIGGER [UPS] ON dbo.UPSSHIPMENT
FOR INSERT
AS
DECLARE @JOBNUMBER CHAR(20)
DECLARE @WEIGHT REAL(4)
DECLARE @FREIGHTCOST MONEY(8)
DECLARE @TRACKINGNUMBER CHAR(25)
DECLARE @SHIPMETHOD CHAR(50)
DECLARE @voidid char(2)
SELECT @JOBNUMBER=JOBNUMBER,
@WEIGHT=WEIGHT,
@FREIGHTCOST=FREIGHTCOST,
@TRACKINGNUMBER=TRACKINGNUMBER,
@SHIPMETHOD=SHIPMETHOD,
@VOIDID=VOIDID
FROM INSERTED
UPDATE PACKAGE
SET PACKAGE.WEIGHT = @WEIGHT,
PACKAGE.FREIGHTCOST = @FREIGHTCOST,
PACKAGE.TRACKINGNUMBER = @TRACKINGNUMBER,
PACKAGE.COMMENTS = @SHIPMETHOD
WHERE PACKAGE.JOBNUMBER = @JOBNUMBER
AND @VOIDID = 'N'
UPDATE PACKAGE
SET PACKAGE.WEIGHT = '',
PACKAGE.TRACKINGNUMBER = '',
PACKAGE.COMMENTS = 'UPS VOID',
PACKAGE.FREIGHTCOST = ''
WHERE PACKAGE.JOBNUMBER = @JOBNUMBER
AND @VOIDID = 'Y'
I am getting the following error see attached.
Any help would be great Thank you!
Hallo there,
I'm totally new to writing triggers, but managed to get a trigger to update a specific column (ufINCTcost) on change of another column (ufINCKm)
My problem is that the trigger performs this update on ALL rows, which makes it very slow. How can I get it to only update the column on the row where the change was made ?
My trigger looks as follows:
CREATE TRIGGER updateincidents ON [dbo].[_rtblIncidents]
FOR UPDATE, INSERT
AS
IF UPDATE (ufINCKm)
BEGIN
UPDATE dbo._rtblIncidents
SET ufINCTcost=dbo._rtblIncidents.ufINCKm+dbo._rtblInc idents.ufINCToll+dbo._rtblIncidents.ufINCParking+d bo._rtblIncidents.ufINCFlight+dbo._rtblIncidents.u fINCRental
Hope you can help !!