Trigger Not Fired

Jul 10, 2001

Hi,
I have an Access frontend and an SQL Server backend. I use a Query (in Access frontend) to insert in two tables simultaneously. I have a trigger in one of the involved table which update the foreign key in another involved table.
I've built an SQL View with exacly!!! the same syntax as my Query in Access.
And when I insert a new entry through the SQL View the trigger fires(the foreign key is updated), but when I insert through my Access Query the trigger doesn't fires (the foreign key is not updated).
Any idea ?

Thanks in advance

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Trouble With Update Trigger Modifying Table Which Fired Trigger

Jul 20, 2005

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'

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May 23, 2002

Hi,

We have an asp web aplication using COM on a SQL Server 2000 database. The application uses COM to perform the database access. On altering data, the code checks the @@rowcount to see if the intented insert or update was succesfull - this is done on changes in various colums in various locations in the code.
Now we need to add a trigger to update changed data into other tables. This is because we start migrating to a different data structure - while keeping most of the original code intact.

The problem is now, that the trigger beeing fired erases the @@rowcount. I can imagine others to have experienced the same problem. So, the big question is here:

Is there a solition/workaround to keep the @@rowcount on update/insert/deletes on a table evn if a trigger fires?

Thank you,
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Hi,

I've created the following trigger:

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AS
BEGIN
EXEC myDatabase.dbo.myProcedure
END

The trigger is NOT fired (and procedure not executed) when I create a new login or alter an existing login.
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Please tell if it's a problem with SQL Server 2005 or am I making some mistake here?

-Anshul

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My Best wishes for the new year to all the folks in the forum. Wishing you greater days ahead.

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Everywhere is a walking distance if you have the time - Steven Wright

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Hello all,

I'm trying to cath content of PRINT statements through InfoMessage event. I have subscribed on InfoMessage event through ConnectionEventsVt interface. The problem that event fired only once for statement. For example i have following T-SQL script:




Code Snippet

PRINT 'Message1'
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GO

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Hi all,



I am investigating using Query Notifications - a great addition BTW. I have built a test app - loosely based on MSDN example - and am running against a SQL Express 2005 server. I have the following problem:



I have start/stop buttons to enable change checking, and a hardcode query that I am using for testing. If I stop and restart I now recieve duplicate notifcations, a single change causing the OnChange event to fires twice with two different ids Repeat this and the event will fires 3 times for each change and so on.

This only happens with a running app, if I restart the app I only get a single notification so I assume I have missed a step in stopping query notifcations or reinitialisation. I have include code below:



private bool Start()

{

try

{

// Remove any existing dependency connection, then create a new one.

SqlDependency.Stop(_currentConnectionString);

if (SqlDependency.Start(_currentConnectionString))

{

if (connection == null)

{

connection = new SqlConnection(_currentConnectionString);

}

if (command == null)

{

command = new SqlCommand(_sqlQueryString, connection);

}

return (true);

}

}

catch (Exception e)

{

MessageBox.Show(e.Message);

}

return false;

}

private void Stop()

{

SqlDependency.Stop(_currentConnectionString);

if (command != null)

{

command.Notification = null;

command = null;

}

if (connection != null)

{

connection.Close();

connection = null;

}

}

private void GetDataSnapshot()

{

// Empty the dataset so that there is only

// one batch of data displayed.

dataToWatch.Clear();

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// a notification object associated with it.

command.Notification = null;

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// to the command object.

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dependency.OnChange += new OnChangeEventHandler(dependency_OnChange);

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{

adapter.Fill(dataToWatch, tableName);

}

}

private void dependency_OnChange(object sender, SqlNotificationEventArgs e)

{

// This event will occur on a thread pool thread.

// Updating the UI from a worker thread is not permitted.

// The following code checks to see if it is safe to

// update the UI.

ISynchronizeInvoke i = (ISynchronizeInvoke)this;

// If InvokeRequired returns True, the code

// is executing on a worker thread.

if (i.InvokeRequired)

{

// Create a delegate to perform the thread switch.

OnChangeEventHandler tempDelegate = new OnChangeEventHandler(dependency_OnChange);

object[] args = { sender, e };

// Marshal the data from the worker thread

// to the UI thread.

i.BeginInvoke(tempDelegate, args);

return;

}

// Remove the handler, since it is only good

// for a single notification.

SqlDependency dependency = (SqlDependency)sender;

dependency.OnChange -= dependency_OnChange;

// At this point, the code is executing on the

// UI thread, so it is safe to update the UI.

++changeCount;

lblStatus.Text = String.Format(statusMessage, changeCount);

// Add information from the event arguments to the list box

// for debugging purposes only.

//lbChanges.Items.Clear();

lbChanges.Items.Add("+++++++++++++++++");

lbChanges.Items.Add("Id: " + dependency.Id);

lbChanges.Items.Add("Info: " + e.Info.ToString());

lbChanges.Items.Add("Source: " + e.Source.ToString());

lbChanges.Items.Add("Type: " + e.Type.ToString());

// Reload the dataset that is bound to the grid.

if (e.Info != SqlNotificationInfo.Error)

this.GetDataSnapshot();

}



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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.

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

Thanks.

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Generic Audit Trigger CLR C#(Works When The Trigger Is Attached To Any Table)

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


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Feb 5, 2008

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:

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as
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I have the following Trigger

the error is at

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

-- 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



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DROP TRIGGER @DeleteTrigger

GO

END

GO

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Here is my t-sql


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May 28, 2008

 
Hello Experts,

Currently I have 3 tables; Persons, Student and Teacher. Persons is the parent table of Student and Teacher and they are linked by the Person_Id attribute. For example, if Person_Id 1 exist in Student table, it cannot be inserted anymore into Teacher table. How do I write a trigger in MS SQL to implement this business rule? Any experts can shed some light? Thanks!

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