Hello, everyone. I am sorry I haven't been around for long but I have got this confusion. I haven't been able to set triggers between 2 tables.
I have got a set of data in 1 table and another set in the other table. I want to set the trigger by comparing the data column from one table to another.
All I want to know is is ti possible to do it? Because I have been told that I can only set triggers on only one table.
I'm thinking of building a trigger against a system table(sysobjects) in database(a) on server(a) that will assist me in updating a table in database(b)on server(b). What I need to know from table(b)is if a new table has been added and removed from database(a) on server(a). I want to use a store procedure to query the table(b). I was thinking of building a trigger against my sysobjects table that would update table(b) whenever any tables are added or removed from database(a). Has anyone built triggers against system tables? I am running SQL 7.
Dear Group,I would like to create an audit table that is created with a trigger thatreflects all the changes(insert, update and delete) that occur in table.Say I have a table withSubject_ID, visit_number, dob, weight, height, User_name, inputdateThe audit table would have .Subject_ID, visit_number, dob, weight, height, User_name, inputdate,edit_action, edit_reason.Where the edit_action would be insert, update, delete; the edit_reason wouldbe the reason given for the edit.Help with this would be great, since I am new to the world of triggers.Thanks,Jeff
I have decided to use CLR Triggers to synchronize data between two different tables but I have a problem. The scenario is this. I do an insert in Table1. Table1 firest the trigger which then inserts a record in Table2. The trigger in Table2 fires a trigger which does an insert to Table1 again.
I need to find a way to disable the trigger so that it will not go in an infinite loop when I insert a record in either of the tables. What I have done so far is to disable Table2's trigger before I commit my insert to Table2 so that Table2's trigger won't fie. I will then enable the trigger after the insert is committed. Also, I have a webservice which manages the inserts/updates/deletes. I call webmethods from this webservice in my clr triggers.
How can we write triggers on system table dbo.sysobjects, when i tries to write a trigger, it is giving an error that permission is denied. I even give a permission of "allow modifications to system catalogs" in Enterprise manager. still it is not giving permission. How can i create a trigger on dbo.sysobjects table?
Does anyone know if it's possible to create a trigger on the sysdatabases table in the master database? I keep getting permission denied which I'm not sure is right.
Does anyone know of a way I can create a trigger on a system table (say sysdatabases in master). I know this is not supported but presumably there's a way it can be done by referencing it's equivilant in Information_schema somewhere.
I'm trying to write a script that will automatically set up a backup schedule for a database that has just been created. I was hoping the trigger would query the sysdatabases table for new database name entries, log necessary info in an audit table and then call a backup script to set up the schedule. Any ideas??
I am reading the WROX "Professional SQL Server 7 Programming" book. The following code appears on page 424:
CREATE TRIGGER ProductIsRationed ON Products FOR UPDATE AS IF EXISTS ( SELECT 'True' FROM Inserted i JOIN Deleted d ON i.ProductID = d.ProductID WHERE (d.UnitsInStock - i.UnitsInStock) > d.UnitsInStock / 2 AND d.UnitsInStock - i.UnitsInStock > 0 ) BEGIN RAISERROR('Cannot reduce stock by more than 50%% at once.',16,1) ROLLBACK TRAN END
The trigger fires when an UPDATE is made to Products table. The author states that the Inserted and Deleted tables only exist for the life of the trigger, not before, and not after the trigger runs. If this is true, then why would there be any rows in the Deleted table in this case? No rows were deleted within the trigger. As far as I can see, no rows have been updated either. If the condition does exist, no rows will be updated, and an error will be displayed. Otherwise, the row will be updated. Then there would be a row in the inserted table. But then the trigger is finished and the inserted table for that trigger disappears. I think my logic is flawed, which is why I am writing. I don't think I fully understand the Inserted and Deleted tables.
how do i return only the tables created by the user? in three of my databases i am inserting one record per 5 secs. in all the tables. how good is using triggers for 'insert instead of' for these tables?
I have a table "PageInfo" wich has columns "PageID, Title(has "AboutUs" as one of the values), DateModified, Active". My other table is "AboutUs" and has columns "ID, WhatsNew, Welcome, Active".
My goal here is that if table "AboutUs" is affected as an "INSERT" or an "UPDATE" on any row, I want "PageInfo.DateModified" WHERE "PageInfo.Title = AboutUs" to be updated with "getDate()". Don't know if I'm clear enough but thanks in advance.
I am trying to create a stored procedure that will disable triggers on any given table. Basically I want to pass in a table name as a parameter and query the master table for all triggers that belong to that table...then disable them. I just don't know how to get a list of triggers that belong to a table?
When you import data using DTS into a table that has triggers - do the triggers fire off if there are triggers for on insert or on after insert?Thanks,--Micah
i'm in a bit of a bind at work. if anyone could help, i'd greatlyappreciate it.i have a web app connecting to a sql server using sql serverauthentication. let's say, for example, my login/password isdbUser/dbUser. the web app however, is using windows authentication.so if I am logged into the network as 'DOMAINEric', when I access myweb app, my web app knows that I am 'DOMAINEric'. but to the sqlserver db, I am user 'dbUser'.now, i for each table i have, i need to implement an audit table torecord all updates, inserts, deletes that occur against it. i wasgoing to do so with triggers. this is all fine for selects, inserts,and updates. for each table, i have an updatedby and an updatedate.for example, let's say i have a table:create table blah(id int,col1 varchar(10),updatedby varchar(30),updatedate datetime)and corresponding audit table:create audit_blah(id int,blah_id int,blah_col1 varchar(10),blah_updatedby varchar(1),blah_updatedate datetime)for update and insert triggers, i can know what to insert into theupdatedby column of audit_blah because it's in a corresponding row inblah. my web app knows what user is accessing the application, andcan insert that name into blah. blah's trigger will then insert thatname into audit_blah.however, in the case of a delete, i'm not passing in an 'updatedby',because i'm deleting. in this situation, how can the trigger knowwhat user is deleting? the db only knows that sql user 'dbUser' isdeleting, but doesn't know that 'dbUser' is deleting on behalf of'DOMAINEric'. is there any way for my app to inform the trigger toaccess my windows identity without having a corresponding row in thetable from which to pull that info?obviously, i could have each of my app's users log into SQL serverthrough Windows authentication; then i could just use SYSTEM_USER.but let's say, for performance's sake, it'd be better for me to useone sql server login. (i believe one user works better for connectionpooling purposes.) is there a way to get around this?(i'm hoping a built-in function exists that solves all my problems.)suggestions? resources?any help would be great appreciated.happy turkeys.Eric
I have a situation that I must resolve. I have a program being used by many but I had to create a new table to provide a new feature. The problem I have is this table must use the primary key from the parent table as its primary key, meaning when a user adds a new record to parent table, I need to instantly add the primary key to the child table. Now this was done in the program using sql statements, but I need to implement a trigger or such as to keep me from having to reinstall application on many computers.
basically person inserts new record, then I need to get the new primary ket and add insert it into the child tables. how can I do this with a trigger. I have tried to use an insert into statment with my trigger, but I can't seem to pass the parameters correctly.
CREATE Trigger dbo.Table_Borrower_Insert_Keys ON Table_Borrower AFTER INSERT AS begin declare @bid as int
@bid = select MAX(BorrowerID) FROM Table_SoldProgression
INSERT Table_SoldProgression(BorrowerID) values (@bid) end GO
another attempt
CREATE Trigger dbo.Table_Borrower_Insert_Keys ON Table_Borrower AFTER INSERT AS
I want to compare the before and after values of an UPDATEd column using a trigger. I want to know if the value in the column has changed. Simple? No!
As you know, SqlServer puts the before image of the UPDATEd rows into the DELETED virtual table and the after image of the UPDATEd rows in the INSERTED virtual table.
So you would get the before and after data by doing a SELECT on these tables. But here is the problem - how do you join the tables? What if there are >1 rows in these 2 tables (because the UPDATE affected >1 rows) - how do i know which "old"/DELETED rows correspond to which "new"/INSERTED?" Ok - I could join the 2 tables on the primary key, but what if the primary key was updated? In that case the join would not work - the DELETED table would contain the old primary key value and the INSERTED table would contain the new (different) primary key value. In fact, ALL of the columns may have been changed by the UPDATE.
Now, there is another thing to try with triggers - the IF UPDATE ( <columname> ) test. This is designed to tell you if a specified column was UPDATEd by the last UPDATE. However, this will return TRUE for any UPDATE that mentions the column - even if the UPDATE does not change any data! So I cannot determine whether a certain column has had its value changed with this either.
So then you can try another test mentioned in the docs for CREATE TRIGGER - the IF COLUMNS_UPDATED() test. However, this will report that a column has been updated, NOT whether the data has changed as aresult of that UPDATE. So if you UPDATE the value in the column to the same value as it was beforehand (admittedly, a pointless thing to do, but it could happen in some apps), this fuction will say, yes, this column was updated.
So my question remains - how do I know if the data has changed in a column after an UPDATE, using a trigger? Any ideas?
For my company, we have made it a standard to create history tables and triggers for the majority of our production tables. I recently grew tired of consistently spending the time needed to create these tables and triggers so I invested some time in creating a script that would auto generate these.
We recently launched a project which required nearly 100 history tables & triggers to be created. This would have normally taken a good day or two to complete. However, with this script it took a near 10 seconds. Here are some details about the script.
The code below creates a stored procedure that receives two input parameters (@TableName & @CreateTrigger) and performs the following actions:
1) Queries system tables to retrieve table schema for @TableName parameter
2) Creates a History table ("History_" + @TableName) to mimic the original table, plus includes additional history columns.
3) If @CreateTrigger = 'Y' then it creates an Update/Delete trigger on the @TableName table, which is used to populate the History table.
/************************************************************************************************************ Created By: Bryan Massey Created On: 3/11/2007 Comments: Stored proc performs the following actions: 1) Queries system tables to retrieve table schema for @TableName parameter 2) Creates a History table ("History_" + @TableName) to mimic the original table, plus include additional history columns. 3) If @CreateTrigger = 'Y' then it creates an Update/Delete trigger on the @TableName table, which is used to populate the History table. ******************************************* MODIFICATIONS ************************************************** MM/DD/YYYY - Modified By - Description of Changes ************************************************************************************************************/ CREATE PROCEDURE DBO.History_Bat_AutoGenerateHistoryTableAndTrigger @TableName VARCHAR(200), @CreateTrigger CHAR(1) = 'Y' -- optional parameter; defaults to "Y" AS
-- query system tables to get table schema SELECT CONVERT(VARCHAR(500), SP2.value) AS TableDescription, CONVERT(VARCHAR(100), SC.Name) AS FieldName, CONVERT(VARCHAR(50), ST.Name) AS DataType, CONVERT(VARCHAR(10),SC.length) AS FieldLength, CONVERT(VARCHAR(10), SC.XPrec) AS FieldPrecision, CONVERT(VARCHAR(10), SC.XScale) AS FieldScale, CASE SC.IsNullable WHEN 1 THEN 'Y' ELSE 'N' END AS AllowNulls FROM SysObjects SO INNER JOIN SysColumns SC ON SO.ID = SC.ID INNER JOIN SysTypes ST ON SC.xtype = ST.xtype LEFT OUTER JOIN SysProperties SP ON SC.ID = SP.ID AND SC.ColID = SP.SmallID LEFT OUTER JOIN SysProperties SP2 ON SC.ID = SP2.ID AND SP2.SmallID = 0 WHERE SO.xtype = 'u' AND SO.Name = @TableName ORDER BY SO.[name], SC.ColOrder
OPEN CurHistoryTable
FETCH NEXT FROM CurHistoryTable INTO @TableDescr, @FieldName, @DataType, @FieldLength, @Precision, @Scale, @AllowNulls
WHILE @@FETCH_STATUS = 0 BEGIN
-- create list of table columns IF LEN(@FieldList) = 0 BEGIN SET @FieldList = @FieldName SET @FirstField = @FieldName END ELSE BEGIN SET @FieldList = @FieldList + ', ' + @FieldName END
IF LEN(@SQLTable) = 0 BEGIN SET @SQLTable = 'CREATE TABLE [DBO].[History_' + @TableName + '] (' + @CRLF SET @SQLTable = @SQLTable + @TAB + '[History' + @FieldName + '] [INT] IDENTITY(1,1) NOT NULL,' + @CRLF END
IF UPPER(@DataType) IN ('CHAR', 'VARCHAR', 'NCHAR', 'NVARCHAR', 'BINARY') BEGIN SET @SQLTable = @SQLTable + '(' + @FieldLength + ')' END ELSE IF UPPER(@DataType) IN ('DECIMAL', 'NUMERIC') BEGIN SET @SQLTable = @SQLTable + '(' + @Precision + ', ' + @Scale + ')' END
IF @AllowNulls = 'Y' BEGIN SET @SQLTable = @SQLTable + ' NULL' END ELSE BEGIN SET @SQLTable = @SQLTable + ' NOT NULL' END
SET @SQLTable = @SQLTable + ',' + @CRLF
FETCH NEXT FROM CurHistoryTable INTO @TableDescr, @FieldName, @DataType, @FieldLength, @Precision, @Scale, @AllowNulls END
CLOSE CurHistoryTable DEALLOCATE CurHistoryTable
-- finish history table script with standard history columns SET @SQLTable = @SQLTable + @TAB + '[HistoryCreatedOn] [DATETIME] NULL,' + @CRLF SET @SQLTable = @SQLTable + @TAB + '[HistoryCreatedByUserID] [SMALLINT] NULL,' + @CRLF
SET @SQLTable = @SQLTable + @TAB + '[HistoryCreatedByUserName] [VARCHAR](30) NULL,' + @CRLF SET @SQLTable = @SQLTable + @TAB + '[HistoryAction] [CHAR](1) NOT NULL' + @CRLF SET @SQLTable = @SQLTable + ' )'
PRINT @SQLTable
-- execute sql script to create history table EXEC(@SQLTable)
IF @@ERROR <> 0 BEGIN PRINT '******************** ERROR CREATING HISTORY TABLE FOR TABLE: ' + @TableName + ' **************************************' RETURN -1 END
IF @CreateTrigger = 'Y' BEGIN -- create history trigger SET @SQLTrigger = '/************************************************************************************************************' + @CRLF SET @SQLTrigger = @SQLTrigger + 'Created By: ' + SUSER_SNAME() + @CRLF SET @SQLTrigger = @SQLTrigger + 'Created On: ' + @Date + @CRLF SET @SQLTrigger = @SQLTrigger + 'Comments: Auto generated trigger' + @CRLF SET @SQLTrigger = @SQLTrigger + '***********************************************************************************************/' + @CRLF SET @SQLTrigger = @SQLTrigger + 'CREATE TRIGGER [Trigger_' + @TableName + '_UpdateDelete] ON DBO.' + @TableName + @CRLF SET @SQLTrigger = @SQLTrigger + 'FOR UPDATE, DELETE' + @CRLF SET @SQLTrigger = @SQLTrigger + 'AS' + @CRLF + @CRLF SET @SQLTrigger = @SQLTrigger + 'DECLARE @Action CHAR(1)' + @CRLF + @CRLF SET @SQLTrigger = @SQLTrigger + 'IF EXISTS (SELECT ' + @FirstField + ' FROM Inserted)' + @CRLF SET @SQLTrigger = @SQLTrigger + 'BEGIN' + @CRLF SET @SQLTrigger = @SQLTrigger + @TAB + 'SET @Action = ''U''' + @CRLF SET @SQLTrigger = @SQLTrigger + 'END' + @CRLF SET @SQLTrigger = @SQLTrigger + 'ELSE' + @CRLF SET @SQLTrigger = @SQLTrigger + 'BEGIN' + @CRLF SET @SQLTrigger = @SQLTrigger + @TAB + 'SET @Action = ''D''' + @CRLF SET @SQLTrigger = @SQLTrigger + 'END' + @CRLF + @CRLF SET @SQLTrigger = @SQLTrigger + 'INSERT INTO History_' + @TableName + @CRLF SET @SQLTrigger = @SQLTrigger + @TAB + '(' + @FieldList + ', HistoryCreatedOn, HistoryCreatedByUserName, HistoryAction)' + @CRLF SET @SQLTrigger = @SQLTrigger + 'SELECT ' + @FieldList + ', GETDATE(), SUSER_SNAME(), @Action' + @CRLF SET @SQLTrigger = @SQLTrigger + 'FROM DELETED'
--PRINT @SQLTrigger
-- execute sql script to create update/delete trigger EXEC(@SQLTrigger)
IF @@ERROR <> 0 BEGIN PRINT '******************** ERROR CREATING HISTORY TRIGGER FOR TABLE: ' + @TableName + ' **************************************' RETURN -1 END
We have a partitioned view with 4 underlying tables. The view and eachof the underlying tables are in seperate databases on the same server.Inserts and deletes on the view work fine. We then add insert anddelete triggers to each of the underlying tables. The triggers modifya different set of tables in the same database as the view (differentthan the underlying table). The problem is those triggers aren't firedwhen inserting or deleteing via the view. Inserting or deleteing theunderlying table directly causes the the triggers to fire, but not whenthe tables are accessed as a result of using the view.Am I missing something? The triggers are 'for insert' and 'fordelete'. No 'instead of' or 'after' triggers.
I want to be able to duplicate every single record that is inserted or updated in a particular table to another table, but not the delete. Is the best way to set-up a trigger? If so can anyone provide me with an example of how to do this? Also could you just duplicate certain columns in the row I would you have to do all columns?
I have many new tables for which i need to write Insert,Update and delete triggers manually. Is there any way to generate triggers script which takes table name as a input parameter and print/generate trigger's script?
I am trying to run a test migration of our application from V8 to V9. To do this I am creating an empty database by running the Tasks -> Script database
Once that is done, I restore it to our dev server and run SQLCompare against it to generate the change scripts
The problem I am facing is that there are a few tables that have encrypted triggers on them and I cannot include them in the generate scripts. I want to take the table structure, including indexes, but I am not interested in the triggers. There are only 5 tables so I could script them by hand, but this means that I cannot automate the process.
As a result of the missing tables SQLCompare will try to generate a CREATE TABLE rather than an ALTER TABLE DDL
The live migration won't be a problem because this will be a database restore and migration - my problem is the CREATE TABLE DDLs in the script.
I would like to wrap the following code in a function and reuse it. Â I use this code in many triggers.
DECLARE @Action as char(1); SET @Action = (CASE WHEN EXISTS(SELECT * FROM INSERTED) AND EXISTS(SELECT * FROM DELETED) THEN 'U' Â -- Set Action to Updated. WHEN EXISTS(SELECT * FROM INSERTED) THEN 'I' Â -- Set Action to Insert. WHEN EXISTS(SELECT * FROM DELETED) THEN 'D' Â -- Set Action to Deleted. ELSE NULL -- Skip. It may have been a "failed delete". Â Â END)
Is it possible to write a function and pass the INSERTED and DELETED logical tables to it?
This isn€™t an problem as such, it€™s more of a debate.
If a table needs a number of update triggers which do differing tasks, should these triggers be separated out or encapsulated into one all encompassing trigger. Speaking in terms of performance, it doesn€™t make much of an improvement doing either depending upon the tasks performed. I was wondering in terms of maintenance and best practice etc. My view is that if the triggers do totally differing tasks they should be a trigger each on their own.
I'm new to my company, although not new to SQL 2005 and I found something interesting. I don't have an ERD yet, and so I was asking a co-worker what table some data was in, they told me a table that is NOT in SQL Server 2005's list of tables, views or synonyms.
I thought that was strange, and so I searched over and over again and still I couldn't find it. Then I did a select statement the table that Access thinks exists and SQL Server does not show and to my shock, the select statement pulled in data!
So how did this happen? How can I find the object in SSMS folder listing of tables/views or whatever and what am I overlooking?
Is it possible to achieve this using triggers:When someone tries to delete a row in table A, the trigger should first delete a corresponding row in table B and then delete the row in table A. The reason being that, there is a foreign key set on Table B that references table A. So any attempt to delete a row in table A without deleting the corresponding row from B, throws an error.
Hello All, I have to write Trigger for Update, I have two tables, one is for storing records of current values, and one is for storing history of values. How to Write a Trigger on Main Table. As we have Inserted and Deleted Tables through which we can find Values, We dont have any Table for UPDATED Values. Help me. General Problem
I need to create a set of rows every time a new row is inserted into a table. Example (I think this would work)... select @insertedId = column1 from insertedselect @id = column1 from table1 where column2 in (select column1 from table2 where column2 = @insertedId)insert into table3 values(x, y, @id) Is it possible to do the same kind of thing in a situation where the select statement returns multiple values and execute the insert statement for each of these values? Also, if table3 was in fact the table on which the trigger acts, would it then be executed for every row created by the trigger? Sorry if I sound confused. I am.
hi everybody..i tried to put thios loop in sql server 2000 But it is not taking The @ action taken value ,,it is only taking the default value of @actiontaken value. SET @ActionTaken = 'A' IF (@AType = 'A')IF @Status= 'O' IF (@KAppInd ='Y' AND @DAppInd=null)BEGINSET @ActionTaken = 'O'END
Please tell me other option in sql server 2000 for setting variable value based on conditions
Hi using triggers i try to insert some values in to my 2 tables: But its showing teh error as "The request for procedure 'Triginsert123s' failed because 'Triginsert123s' is a trigger object." This is my code in back end: sqlcon.Open() Dim cmd As New SqlCommand("Triginsert123s '" & txtID.Text & "','" & txtName.Text & "','" & txtRole.Text & "','" & txtDep.Text & "'", sqlcon) cmd.ExecuteNonQuery() sqlcon.Close() My trigger is: CREATE TRIGGER Triginsert123s ON [dbo].[EmpRole] FOR INSERT AS declare @Eid as tinyint, @Ename as varchar(50), @Role as char(10) Insert into Emprole(Eid,Ename,Role) values(@Eid,@Ename,@Role) insert into empdep(eid,dep) values(@eid,@Role) Whats the probs?, Plz i am new to triggers help me,
Hi All, I'm using triggers to handle my transaction log to cature inserts and updates. It works fine except if the user clicks on the Save button more than once, the trigger is fired and the record is written to the log even if the record wasn't changed. Does anyone know how to check if the record was actually changed so that it isn't written to the table if it wasn't?
When I execute a stored proc from my asp.net page, will the results of a trigger be returned to my program?
For instance say my stored proc is:
Update Employees set (Lastname = @Lastname) where ID = @ID
And my trigger is:
CREATE TRIGGER tr_Employees_U on Employees FOR UPDATE AS IF UPDATE(lastname) BEGIN RAISERROR ('cannot change lastname', 16, 1) ROLLBACK TRAN RETURN END GO
It seems like since this is an AFTER trigger that my webpage would actually get a valid return code from my stored procedure however the trigger would rollback those changes correct? Or would the trigger get fired and send it's return code to my webpage?
I'm trying to write an instead of trigger for a view in SqlExpress...the table and views are defined as such:CREATE TABLE [dbo].[Work]( [WorkID] [int] IDENTITY(1,1) Primary Key, [ResourceID] [int] NOT NULL, [TaskID] [int] NOT NULL, [WorkDate] [datetime] NOT NULL, [WorkQuantity] [float] NOT NULL, [IsEstimate] [bit] NOT NULL DEFAULT ((0)), [Project] [int] NOT NULL,);CREATE VIEW [dbo].[ActualWork]ASSELECT WorkID, ResourceID, TaskID, WorkDate, WorkQuantity, ProjectFROM dbo.[Work]WHERE (IsEstimate = 0);CREATE VIEW [dbo].[EstimatedWork]ASSELECT WorkID, ResourceID, TaskID, WorkDate, WorkQuantity, ProjectFROM dbo.[Work]WHERE (IsEstimate = 1);Given that, what is wrong with the following create trigger statement:Create Trigger trg_InsertActualWork ondbo.ActualWork Instead of InsertasBEGIN Insert into dbo.Work( ResourceID, TaskID, Project, WorkDate, WorkQuantity, IsEstimate ) values ( inserted.ResourceID, inserted.TaskID, inserted.Project, inserted.WorkDate, inserted.WorkQuantity, 0 );END
l'm trying to build a trigger on a table. The reason for the trigger is to check a certain field for the first three characters if it has ie abc it must update another field in this case loanbook to newabc.How do l write the trigger so that it also check if exists and perform the updates. Please help its Urgent. l've listed the trigger below.
CREATE TRIGGER UpdTest_TRGData ON Test_TRG FOR insert,Update AS
IF left('Loan_No',3)='ABC' update Test_TRG set loanbook = 'NEWABC'
else
IF left('Loan_No',3)='DEF' update Test_TRG set loanbook = 'NEWDEF' where loanbook is null
else
update Test_TRG set loanbook =left('Loan_No',3) where loanbook is null
