Trigger Information

Jul 26, 2001

Hi,
I have a problem here in my SQL Server Database. I want to find which trigger is working backend affecting my table input. Since the original author of this trigger was somebody else, I am not able to find the trigger information
A simple line of syntax would be great.
Thanks in advance
sandeep

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Trigger Information

Jul 26, 2000

Is there a way to view the triggers on a table using query analyzer?

I have a developer that wants to see this information without having to right click every table in the database and viewing the triggers through enterprise manager.

Thanks,

Brad

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Need Information For Before Select Trigger

Jun 8, 2006

hi guys!Currently i'm facing a bit odd situation. i cant modify my code so ihave to make changes in SQL Server.the problem is, i've modified one table by adding new column and now iwant only those row which has not null value in that column wheneverthe select statement gets fire. i mean in every select statement onlythose rows should be returned which has NOT NULL value in the newlyadded column.for this i've created one view and tried to run the application but thei'm facing some problem as my application is developed in .net 2.0,i've used lots of .net functionalities and now i cant make any changesin Code.another solution i think is triggers. if i can fire a trigger beforeany select statements, my problem can be solved instantly but i'mafraid i can not write andy "before select" trigger.if anyone has any idea or any other solution to my problem, please letme know.all suggestions are welcomed.thanks,Lucky

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May 24, 2006

Hi There

We have some mystery deletes happening on a table.

The server is very busy, so a profiler trace on this table would result in thousands of events to sift through.

So i would like to put a trigger on this table that on delete could capture information such as the sql statement or user that caused he delete.

Anyone got any ideas on the best way to do this? Or any way to do this ?

Thanx

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Jan 4, 2008

I'm wondering if there's a good way to sort of pass a value to a trigger, in cases where it needs to store more than just what it can collect from the table it is triggering off of.

We have a database that is used by several applications. Each application connects to the database using a distinct SQL Server Login. So, "Application1" might connect to the database using SQL Server Login "Application1Login".

Each application can be used by any number of users who "log in" to the application. This process merely authenticates them against a stored username and password in the database, but it uses the "Application1Login" for actually connecting to the database. So, when users log in to the application, they're all using the same SQL Server Login to connect to the database. This isn't something that is likely to change, though I realize my question could be answered more simply if each person using the system connected via a specific SQL Server Login.

Whenever an action is performed against the database by an application user, we pass the UserId of the user. We store that UserId in tables when they are inserted or updated. We also have History Tables on several tables, with triggers on Insert, Update, and Delete.

The Insert and Update triggers work great: The stored procedure sets the "LastModifiedByUserId" field in the table to the passed UserId, which causes the history table's entry to use that newly changed information. So, we can always tell who inserted or modified a History table entry by setting the Last Modified By field in the Insert or Update.

The problem is with deletions. Since deletions don't set the LastModifiedByUserId field (it doesn't set fields; it's deleting the row), then the trigger has nothing new to go on. The trigger will cause the History table entry to use the last known value of the LastModifiedByUserId field, which is probably not going to be the person who actually deleted the record.

My solution to this problem is to create a "HistoryDeletedUser" table which only contains a single row, and a single column, which is used to store a UserId value. When performing a deletion, I would first update that table, setting the UserId to the current user's UserId. Then, I delete from the appropriate table. The DELETE trigger would then select the current value from that table, and insert it into the History record as the UserId of the person who deleted the record. After the deletion, I would set the HistoryDeletedUser to Null. As long as I perform my queries within a transaction, it should always be accurate (though I suppose that queries that would otherwise be unrelated to each other would now have to compete for Lock access on the HistoryDeletedUser table...)

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FOR LOGON
AS
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begin
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Hello,

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Nov 14, 2006

Hey,

I'm new to this whole SQL Server 2005 thing as well as database design and I've read up on various ways I can integrate business constraints into my database. I'm not sure which way applies to me, but I could use a helping hand in the right direction.

A quick explanation of the various tables I'm dealing with:
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Impacts - the Risk or Opportunity impacts for the weights of a part/assembly. (See Assemblies have Impacts below)
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Parts have Allocations - For weight history and trending (see Allocations). Example, Nut 17 can have a September 1st allocation, a September 5th allocation, etc.
Assemblies - Parts are assemblies by themselves and can belong to multiple assemblies. Now, there can be multiple parts on a product, say, an unmanned ground vehicle (UGV), and so those parts can belong to a higher "assembly" [For example, there can be 3 Nut 17's (lower assembly) on Widget 1 Subsystem 2 (higher assembly) and 4 more on Widget 1 Subsystem 5, etc.]. What I'm concerned about is ensuring that the weight roll-ups are accurate for all of the assemblies.
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A part is allocated a weight and then assigned to an assembly. The Assemblies table holds this hierarchical information - the lower assembly and the higher one, both of which are Parts entries in the [Parts have Allocations] table.

Therefore, to ensure proper weight roll ups in the [Parts have Allocations] table on a per part-basis, I would like to check for any inserts, updates, deletes on both the [Parts have Allocations] table as well as the [Assemblies] table and then re-calculate the weight roll up for every assembly. Now, I'm not sure if this is a huge performance hog, but I do need to keep all the information as up-to-date and as accurate as possible. As such, I'm not sure which method is even correct, although it seems an AFTER DML trigger is in order (from what I've gathered thus far). Keep in mind, this trigger needs to go through and check every WBS or Part and then go through and check all of it's associated assemblies and then ensure the weights are correct by re-summing the weights listed.

If you need the design or create script (table layout), please let me know.

Thanks.

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Dec 5, 2006

This Audit Trigger is Generic (i.e. non-"Table Specific") attach it to any tabel and it should work. Be sure and create the 'Audit' table first though.

The following code write audit entries to a Table called
'Audit'
with columns
'ActionType' //varchar
'TableName' //varchar
'PK' //varchar
'FieldName' //varchar
'OldValue' //varchar
'NewValue' //varchar
'ChangeDateTime' //datetime
'ChangeBy' //varchar

using System;
using System.Data;
using System.Data.SqlClient;
using Microsoft.SqlServer.Server;

public partial class Triggers
{
//A Generic Trigger for Insert, Update and Delete Actions on any Table
[Microsoft.SqlServer.Server.SqlTrigger(Name = "AuditTrigger", Event = "FOR INSERT, UPDATE, DELETE")]

public static void AuditTrigger()
{
SqlTriggerContext tcontext = SqlContext.TriggerContext; //Trigger Context
string TName; //Where we store the Altered Table's Name
string User; //Where we will store the Database Username
DataRow iRow; //DataRow to hold the inserted values
DataRow dRow; //DataRow to how the deleted/overwritten values
DataRow aRow; //Audit DataRow to build our Audit entry with
string PKString; //Will temporarily store the Primary Key Column Names and Values here
using (SqlConnection conn = new SqlConnection("context connection=true"))//Our Connection
{
conn.Open();//Open the Connection
//Build the AuditAdapter and Mathcing Table
SqlDataAdapter AuditAdapter = new SqlDataAdapter("SELECT * FROM Audit WHERE 1=0", conn);
DataTable AuditTable = new DataTable();
AuditAdapter.FillSchema(AuditTable, SchemaType.Source);
SqlCommandBuilder AuditCommandBuilder = new SqlCommandBuilder(AuditAdapter);//Populates the Insert command for us
//Get the inserted values
SqlDataAdapter Loader = new SqlDataAdapter("SELECT * from INSERTED", conn);
DataTable inserted = new DataTable();
Loader.Fill(inserted);
//Get the deleted and/or overwritten values
Loader.SelectCommand.CommandText = "SELECT * from DELETED";
DataTable deleted = new DataTable();
Loader.Fill(deleted);
//Retrieve the Name of the Table that currently has a lock from the executing command(i.e. the one that caused this trigger to fire)
SqlCommand cmd = new SqlCommand("SELECT object_name(resource_associated_entity_id) FROM
ys.dm_tran_locks WHERE request_session_id = @@spid and resource_type = 'OBJECT'", conn);
TName = cmd.ExecuteScalar().ToString();
//Retrieve the UserName of the current Database User
SqlCommand curUserCommand = new SqlCommand("SELECT system_user", conn);
User = curUserCommand.ExecuteScalar().ToString();
//Adapted the following command from a T-SQL audit trigger by Nigel Rivett
//http://www.nigelrivett.net/AuditTrailTrigger.html
SqlDataAdapter PKTableAdapter = new SqlDataAdapter(@"SELECT c.COLUMN_NAME
from INFORMATION_SCHEMA.TABLE_CONSTRAINTS pk ,
INFORMATION_SCHEMA.KEY_COLUMN_USAGE c
where pk.TABLE_NAME = '" + TName + @"'
and CONSTRAINT_TYPE = 'PRIMARY KEY'
and c.TABLE_NAME = pk.TABLE_NAME
and c.CONSTRAINT_NAME = pk.CONSTRAINT_NAME", conn);
DataTable PKTable = new DataTable();
PKTableAdapter.Fill(PKTable);

switch (tcontext.TriggerAction)//Switch on the Action occuring on the Table
{
case TriggerAction.Update:
iRow = inserted.Rows[0];//Get the inserted values in row form
dRow = deleted.Rows[0];//Get the overwritten values in row form
PKString = PKStringBuilder(PKTable, iRow);//the the Primary Keys and There values as a string
foreach (DataColumn column in inserted.Columns)//Walk through all possible Table Columns
{
if (!iRow[column.Ordinal].Equals(dRow[column.Ordinal]))//If value changed
{
//Build an Audit Entry
aRow = AuditTable.NewRow();
aRow["ActionType"] = "U";//U for Update
aRow["TableName"] = TName;
aRow["PK"] = PKString;
aRow["FieldName"] = column.ColumnName;
aRow["OldValue"] = dRow[column.Ordinal].ToString();
aRow["NewValue"] = iRow[column.Ordinal].ToString();
aRow["ChangeDateTime"] = DateTime.Now.ToString();
aRow["ChangedBy"] = User;
AuditTable.Rows.InsertAt(aRow, 0);//Insert the entry
}
}
break;
case TriggerAction.Insert:
iRow = inserted.Rows[0];
PKString = PKStringBuilder(PKTable, iRow);
foreach (DataColumn column in inserted.Columns)
{
//Build an Audit Entry
aRow = AuditTable.NewRow();
aRow["ActionType"] = "I";//I for Insert
aRow["TableName"] = TName;
aRow["PK"] = PKString;
aRow["FieldName"] = column.ColumnName;
aRow["OldValue"] = null;
aRow["NewValue"] = iRow[column.Ordinal].ToString();
aRow["ChangeDateTime"] = DateTime.Now.ToString();
aRow["ChangedBy"] = User;
AuditTable.Rows.InsertAt(aRow, 0);//Insert the Entry
}
break;
case TriggerAction.Delete:
dRow = deleted.Rows[0];
PKString = PKStringBuilder(PKTable, dRow);
foreach (DataColumn column in inserted.Columns)
{
//Build and Audit Entry
aRow = AuditTable.NewRow();
aRow["ActionType"] = "D";//D for Delete
aRow["TableName"] = TName;
aRow["PK"] = PKString;
aRow["FieldName"] = column.ColumnName;
aRow["OldValue"] = dRow[column.Ordinal].ToString();
aRow["NewValue"] = null;
aRow["ChangeDateTime"] = DateTime.Now.ToString();
aRow["ChangedBy"] = User;
AuditTable.Rows.InsertAt(aRow, 0);//Insert the Entry
}
break;
default:
//Do Nothing
break;
}
AuditAdapter.Update(AuditTable);//Write all Audit Entries back to AuditTable
conn.Close(); //Close the Connection
}
}


//Helper function that takes a Table of the Primary Key Column Names and the modified rows Values
//and builds a string of the form "<PKColumn1Name=Value1>,PKColumn2Name=Value2>,......"
public static string PKStringBuilder(DataTable primaryKeysTable, DataRow valuesDataRow)
{
string temp = String.Empty;
foreach (DataRow kColumn in primaryKeysTable.Rows)//for all Primary Keys of the Table that is being changed
{
temp = String.Concat(temp, String.Concat("<", kColumn[0].ToString(), "=", valuesDataRow[kColumn[0].ToString)].ToString(), ">,"));
}
return temp;
}
}

The trick was getting the Table Name and the Primary Key Columns.
I hope this code is found useful.

Comments and Suggestion will be much appreciated.

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Oct 30, 2007

Table 1





First_Name

Middle_Name

Surname


John

Ian

Lennon


Mike

Buffalo

Tyson


Tom

Finney

Jones

Table 2




ID

F

M

S

DOB


1

Athony

Harold

Wilson

24/4/67


2

Margaret

Betty

Thathcer

1/1/1808


3

John

Ian

Lennon

2/2/1979


4

Mike

Buffalo

Tyson

3/4/04


5

Tom

Finney

Jones

1/1/2000


I want to be able to create a trigger that updates table 2 when a row is inserted into table 1. However I€™m not sure how to increment the ID in table 2 or to update only the row that has been inserted.

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A





ID

Name


1

Joe


2

Fred


3

Ian


4

Bill


B





ID


1


4

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I believe the trigger should look something like this:

create trigger test_trigger
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Hi all in .net I've created an application that allows creation of triggers, i also want to allow the deletion of triggers.
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I have the following Trigger

the error is at

DROP TRIGGER @DeleteTrigger

I'm guessing it dosen't like the trigger name being a variable instead of a static name
how do i get around this?

thanks in advance

-- ================================================

-- Template generated from Template Explorer using:

-- Create Trigger (New Menu).SQL

--

-- Use the Specify Values for Template Parameters

-- command (Ctrl-Shift-M) to fill in the parameter

-- values below.

--

-- See additional Create Trigger templates for more

-- examples of different Trigger statements.

--

-- This block of comments will not be included in

-- the definition of the function.

-- ================================================

SET ANSI_NULLS ON

GO

SET QUOTED_IDENTIFIER ON

GO

-- =============================================

-- Author: <Author,,Name>

-- Create date: <Create Date,,>

-- Description: <Description,,>

-- =============================================

CREATE TRIGGER RemoveTriggers

ON tblTriggers

AFTER DELETE

AS

BEGIN

-- SET NOCOUNT ON added to prevent extra result sets from

-- interfering with SELECT statements.

SET NOCOUNT ON;

Declare @DeleteTrigger as nvarchar(max)

select @DeleteTrigger = TableName FROM DELETED



IF OBJECT_ID (@DeleteTrigger,'TR') IS NOT NULL

DROP TRIGGER @DeleteTrigger

GO

END

GO

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Hi,

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and i.req_fname <> d.req_fname from the where clause then it works fine the first time too. Seems like null value of the column is messing things up

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Here is my t-sql


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leo

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((T1.APPT_REPT_FLG != @P1 OR T1.APPT_REPT_FLG IS NULL) AND
(T1.TEMPLATE_FLG != @P2 OR T1.TEMPLATE_FLG IS NULL)) AND
(T1.SRA_DEFECT_ID = @P3)

But I found the very strange situation - when I manualy put the value '1-FRK' instead of @P3 - Query Optimizer used RIGHT index and I had a very good performance.


And addition when I tried to run the first Query on the same table but with the only 1000 rows the Query Optimiser choose right index.


Wat's on, wat happend with My Query Optimizer? Wy his decision so different from time to time?


Thank's a lot for any information about how to make Optimiser obedient.

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Can we retrieve the same?

Let me know ASAP.

Thanks and Regards,
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Scott Wright

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