Create Script Using Triggers

May 23, 2001

Would it be possible to generate SQL Script using triggers or stored procedures whenever there is a change in database tables like UPDATE or APPEND. Whenever we update or append record it should create a script and save it in a text file so that we can update parent database only with those updated records.

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How To Create Triggers

Dec 8, 2006

hy guys
i m trying to create trigger but i tired to get an error msg

trigger which i want to create is :

CREATE TRIGGER TR_TESTING ON EMPLOYEES
FOR INSERT
AS
DECLARE @TMP AS VARCHAR(1)
SET @TMP=SUBSTRING(FirstName,0,1) FROM EMPLOYEES
IF @TMP='A'
BEGIN
INSERT INTO EMPLOYEES(LastName,FirstName) VALUES('DHARANI','AAMIR')
END
ELSE
BEGIN
PRINT 'INSERT VALID RECORD'
END

**** but i got an error msg

Incorrect syntax near the keyword 'FROM'.

plz guide me abt this problem as soon as possible

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Apr 3, 2007

Hi Guys,
Is there any Wizard or software or tools that I can use to create Triggers for my tables ... !????
It is for MSSQL 2005 database
Thanks for your help,Mehdi

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Nov 19, 1999

I want create trigger in sql7 insert or update in data base sql6.5





Quiero crear un trigger en sql7 que haga un Insert o update en una base de datos de sql6.5, se puede y como?

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May 30, 2007

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


DECLARE @SQLTable VARCHAR(8000), @SQLTrigger VARCHAR(8000), @FieldList VARCHAR(6000), @FirstField VARCHAR(200)
DECLARE @TAB CHAR(1), @CRLF CHAR(1), @SQL VARCHAR(1000), @Date VARCHAR(12)

SET @TAB = CHAR(9)
SET @CRLF = CHAR(13) + CHAR(10)
SET @Date = CONVERT(VARCHAR(12), GETDATE(), 101)
SET @FieldList = ''
SET @SQLTable = ''


DECLARE @TableDescr VARCHAR(500), @FieldName VARCHAR(100), @DataType VARCHAR(50)
DECLARE @FieldLength VARCHAR(10), @Precision VARCHAR(10), @Scale VARCHAR(10), @FieldDescr VARCHAR(500), @AllowNulls VARCHAR(1)

DECLARE CurHistoryTable CURSOR FOR

-- 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


SET @SQLTable = @SQLTable + @TAB + '[' + @FieldName + '] ' + '[' + @DataType + ']'

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

END

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Apr 19, 2002

Hi guys.

I am trying to create a procedure which should drop all existing triggers and can create about 40 differnt triggers in a table.

I cant use "GO" statement in a procedure.

Is there any way to create a procedure like that?

I dont want to run this as a script.

please advice.


--Note: Many triggers use same kind of variable names inside.

-MAK

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May 12, 2008

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.

www.handleysonline.com

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Aug 4, 2004

Hi All,

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Create PROC dbo.GrantPermission
@user1 varchar(50)

as

Grant create table to @user1
go

Grant create view to @user1
go

Grant create Procedure to @user1
Go



Thanks Guys.

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BEGIN
RAISERROR ('cannot change lastname', 16, 1)
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RETURN
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GO


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Dec 4, 2001

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ON Test_TRG
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IF left('Loan_No',3)='ABC'
update Test_TRG
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else

IF left('Loan_No',3)='DEF'
update Test_TRG set
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where loanbook is null

else

update Test_TRG
set loanbook =left('Loan_No',3)
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Dec 5, 2001

I'm a bit confused on this bit please elaborate : " FROM Test_TRG t INNER JOIN inserted i ON t.PK = i.PK ".
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Listed below is what l've tried to do but l'm missing the PK part.Otherwise everything else you explained
in the script is clear. Thanks man its urgent. When l parse the query its fine , but When l run it
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CREATE TRIGGER UpdTest_TRGData
ON Test_TRG
FOR INSERT, UPDATE
AS

UPDATE Test_TRG
SET LoanBook = CASE WHEN LEFT( i.Loan_No, 3 ) = 'MCG' THEN 'NewMCG'
WHEN LEFT( i.Loan_No, 3 ) = 'KVS' AND i.LoanBook IS NULL THEN 'NewKVS'
WHEN LEFT( i.Loan_No, 3 ) = 'MFS' AND i.LoanBook IS NULL THEN 'MFS'
WHEN LEFT( i.Loan_No, 3 ) = 'ABL' AND i.LoanBook IS NULL THEN 'ABL'

WHEN i.LoanBook IS NULL THEN LEFT( i.Loan_No, 3 )
END
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-- Fill in Primary Key or other Join Column(s)
WHERE LEFT( i.Loan_No, 3 ) = 'MCG'
OR ( LEFT( i.Loan_No, 3 ) = 'KVS' AND i.LoanBook IS NULL )
OR i.LoanBook IS NULL

====== Error message =================

Server: Msg 207, Level 16, State 3, Procedure UpdTest_TRGData, Line 11
Invalid column name 'PK'.
Server: Msg 207, Level 16, State 1, Procedure UpdTest_TRGData, Line 11
Invalid column name 'PK'.

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as...

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Declare @U_Name varchar(65)
Declare @O_Name varchar(65)

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Commit Tran

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Jul 20, 2000

Hi,

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Nov 1, 1999

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Hi,
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