Tag Archive for SQL Advent Calendar

SQL Advent Calendar – Day 17 – Now, Which Tables Still Need a Trigger?

AdventCalendar17First Post in this series: SQL Advent Calendar 2013-Day 1- Placeholders in SQL Prompt Snippets

As I was hanging our family Advent Calendar up, I thought I would make one for you, my readers. I’ll be sharing my scripts from two of my favorite products as well as tips on how to create your own.

Oh where, oh where did my trigger go?

On Day 8, Day 9, and Day 10 I wrote about using 4 Change tracking fields in tables. Two of the fields, ModifiedBy and ModifiedDTS are updated in a trigger. If you are slowly making changes to many tables, you can loose track of which tables have the triggers you need.

This little snippet for SQL Prompt, called FindTrig, will get two result sets for you. The first result set is a comma delimited list of tables that have the ModifiedDTS field, but do not have a trigger with the pattern trg__u. The second result set will show you a the same list of tables and the triggers they already have. This will be helpful when the code to update ModifiedBy and ModifiedDTS was added to a different trigger than expected. You definitely don’t want two triggers updating the same two fields. That will cause an infinite loop of updates.

USE <DBName,string, $DBNAME$>
GO
/* ***********************************************************************************
Purpose:    Creates a comma delimited list of tables that may need a trigger to populate
			the ModifiedBy and ModifiedDTS fields
Author:     mstuewe
Date:       12/17/2013
************************************************************************************ */
DECLARE @Tables AS nvarchar(max) 

	SELECT
		@Tables = ISNULL(@Tables + ',', '') + t.name
    FROM
        sys.objects AS t
        JOIN sys.all_columns AS c ON c.object_id = t.object_id
        LEFT JOIN sys.Triggers AS Tr ON tr.name = 'trg_' + t.name + '_iu'
                                                 OR tr.name = 'trg_' + t.name + '_u'
    WHERE
        t.type = 'U'
        AND c.NAME = 'ModifiedDTS'
		AND tr.name IS NULL
	ORDER BY 
		t.name

	IF @Tables IS NULL
		PRINT 'All tables have a trigger.'
	ELSE
	BEGIN
		SELECT @Tables AS TableNames

		SELECT
			t.NAME AS TableName
			,tr.name AS ExistingTrigger
		FROM
			(
			SELECT
				t.object_id
				,t.name
			FROM
				sys.objects AS t
				JOIN sys.all_columns AS c ON c.object_id = t.object_id
				LEFT JOIN sys.Triggers AS Tr ON tr.name = 'trg_' + t.name + '_iu'
														 OR tr.name = 'trg_' + t.name + '_u'
			WHERE
				t.type = 'U'
				AND c.NAME = 'ModifiedDTS'
				AND tr.name IS NULL
			) AS t
			LEFT JOIN sys.Triggers AS Tr ON Tr.parent_id = t.object_id
		ORDER BY 
			t.name
	END
GO

As an example, I created three tables with the four changing tracking fields, Employee, Phone, and PhoneType. I added the trigger to Employee and Phone, but the trigger for Phone had it’s name change. After looking at the results returned, I would know that I only need to create a trigger script for the PhoneType table.

 

AdventCalendar2013Day17_Img1

 

Note: You can download this snippet from my Script Library under Resources. It’s called FindTrig.

 

Previous Post In Series: SQL Advent Calendar – Day 16 – Snippet For In-Line Table Functions

SQL Advent Calendar – Day 16 – Snippet For In-Line Table Functions

AdventCalendar16First Post in this series: SQL Advent Calendar 2013-Day 1- Placeholders in SQL Prompt Snippets

As I was hanging our family Advent Calendar up, I thought I would make one for you, my readers. I’ll be sharing my scripts from two of my favorite products as well as tips on how to create your own.

Three French Hens, I mean User Defined Functions

There are three kinds of User Defined Functions that you can create in SQL Server.

  1. Scalar Functions
  2. Multi-line Table Functions
  3. In-Line Table Functions

They all have a purpose but unfortunately the first two listed above are misunderstood and misused the most. Below are a couple of articles on the differences and the performance problems that can be caused by Scalar and Multi-line Table Functions.

I created this snippet called NewFun for SQL Prompt when I was first learning the differences between these function types, and I still use to today. Why? It saves key strokes.

USE <DatabaseName, string,$DBNAME$>
GO
--Use Shift + Ctrl + M to set Template Parameters
IF  EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'<schemaowner,string,dbo>.<sprocname,string,>') AND type in (N'FN', N'IF', N'TF', N'FS', N'FT'))
DROP FUNCTION <schemaowner,string,dbo>.<sprocname,string,>
GO
/* ***********************************************************************************
Purpose:    [Brief Description]
Notes:      
Sample:    
            EXEC <schemaowner,string,dbo>.<sprocname,string,> [Parameters]
Author:     $USER$
Date:       $DATE$

Revision History
(Change Date)	(Author)		(Description of Change)
-----------------------------------------------------------------
************************************************************************************ */
CREATE FUNCTION <schemaowner,string,dbo>.<sprocname,string,>
(
	--Insert Parameters
)
RETURNS Table
AS 

	RETURN 
	(
		$CURSOR$
	)

GO

 

Note: You can download this snippet from my Script Library under Resources. It’s called NewFun.

Previous Post In Series: SQL Advent Calendar Day -15 – Naming Default Constraints

Next Post In Series: SQL Advent Calendar – Day 17 – Now, Which Tables Still Need a Trigger?

 

SQL Advent Calendar Day -15 – Naming Default Constraints

AdventCalendarDay15First Post in this series: SQL Advent Calendar 2013-Day 1- Placeholders in SQL Prompt Snippets

As I was hanging our family Advent Calendar up, I thought I would make one for you, my readers. I’ll be sharing my scripts from two of my favorite products as well as tips on how to create your own.

Standardization

I truly believe in having coding standards. I think the best standards that a team can have, are the ones that they are willing to adhere to. If no one agrees that commas belong on the left rather than the right, then why does your standards say they have to be on the left?

One standard that I really like to have, and is supper easy to do using macros,  is having decent names for indexes and constraints. DF_Mytable_1837489274 does absolutely nothing for me. But DF_Mytable_isActive, is helpful when looking at all the constraints on my table.

ER Studio DA has three macros to help with these naming standards. Name foreign Key Constraints, Name Primary Key Constraints, and Index Naming. When creating default constraints in ER Studio Data Architect ( ER Studio DA), I found that I was getting random numbers on my default names in SQL Server. This was especially true if I created my defaults from Domains. (Domains are templates for fields. I wrote about Domains here.)So I created an additional macro called Name Default Constraints-Selected to round out this collection of macros.

My particular standard for naming defaults is as follows: DF__. If you have different standards that can be derived from information in the field, then you can change the pattern on line 42. Take a look at lines 36 and 37 too. These two lines are necessary when working with Domains. They make it possible to edit the default name for a field that is tied to a domain.

This macro will perform two different actions. It will create a name for defaults that don’t have one, and it will ask the user if they want to change a name that does not adhere to the standards. After the macro has completed, a dialog box is displayed showing how many defaults were named and how many had their name updated.

'----------------------------------------------------------------------------
' PURPOSE:  	This macro will create and update Default Constraint names on
'				Attributes For All selected Entities. If the attribute is
'				bound, it will overwrite the bound default and name the default.
' Author:   	Mickey Stuewe
' Date:     	12/15/2013
'----------------------------------------------------------------------------
Option Explicit

Sub Main

	Dim objModel As Model
	Dim objSubModel As SubModel
	Dim objSelObject As SelectedObject
	Dim objAttrib As AttributeObj
	Dim objEntity As Entity
	Dim iCounter As Integer
	Dim iNCcounter As Integer
	Dim iunBoundCounter As Integer
	Dim strDefaultName As String

	Set objModel = DiagramManager.ActiveDiagram.ActiveModel
	Set objSubModel = objModel.ActiveSubModel

	If Not objModel.Logical Then

		' Iterate through all the selected objects in the current
		' model.
		For Each objSelObject In objSubModel.SelectedObjects
			If objSelObject.Type = 1 Then  'Entities
				Set objEntity = objModel.Entities.Item(objSelObject.ID)
				For Each objAttrib In objEntity.Attributes
					If Len(objAttrib.DeclaredDefault) > 0 Then
						'if the attribute default is bound, then unbind it so that it can be named.
						If objAttrib.DomainId > 0 Then
							'You have to override the bound default value and the default text (name).
							objAttrib.EnableOverride (1,True)
							objAttrib.EnableOverride (2,True)
							iunBoundCounter = iunBoundCounter + 1
						End If

						strDefaultName = "DF_" & objEntity.EntityName & "_" & objAttrib.AttributeName
						If Len(objAttrib.DefaultName) = 0 Then
							objAttrib.DefaultName = strDefaultName
							iCounter = iCounter + 1
						ElseIf objAttrib.DefaultName <> strDefaultName Then
							If MsgBox("The name of the Default Constraint does not match our naming standards. Would you like to replace it?" & vbCrLf & _
								vbCrLf & vbCrLf & "Attribute: " & objAttrib.AttributeName & " - Default Name: " & objAttrib.DefaultName & " - Value: " & _
								objAttrib.DeclaredDefault & vbCrLf & " Standardized Name: " & strDefaultName, _
								vbYesNo + vbQuestion, "Stadardize Name?") = vbYes Then
									objAttrib.DefaultName = strDefaultName
									iCounter = iCounter + 1
							End If
						End If
					Else
						iNCcounter = iNCcounter + 1
					End If
				Next objAttrib
			End If
		Next objSelObject

		MsgBox iunBoundCounter & " had their defaults unbound so that they could be named." & vbCrLf & vbCrLf & _
				iCounter & " Default Constraints had their name created or updated." & vbCrLf & vbCrLf & _
				iNCcounter & " Attributes were not modified.", vbOkOnly + vbInformation, "Default Constraint Name(s) Created or Updated"

	Else
		MsgBox "You are in a Logical model. Move to a Physical model to name of Default Constraints.", vbOkOnly + vbCritical, "Need Physical Model"
	End If
End Sub

 

Note: You can download this macro from my Script Library under Resources. It’s called Name Default Constraints – Selected.

 

Previous Post In Series: SQL Advent Calendar – Day 14 – Working With Forms in a Macro in ER Studio Data Architect

Next Post In Series: SQL Advent Calendar – Day 16 – Snippet For In-Line Table Functions

SQL Advent Calendar – Day 14 – Working With Forms in a Macro in ER Studio Data Architect

AdventCalendar14

First Post in this series: SQL Advent Calendar 2013-Day 1- Placeholders in SQL Prompt Snippets

As I was hanging our family Advent Calendar up, I thought I would make one for you, my readers. I’ll be sharing my scripts from two of my favorite products as well as tips on how to create your own.

Creating a Form

One of the options that you have when creating a macro in ER Studio Data Architect (ER Studio DA),  is the ability to create a form known as a dialog. The form can gather information for the macro to use, display information to the user after an action has been performed, or interact with the user while the objects in the diagram are updated.

There are three steps to perform when setting up a form.

  1. Creating the layout of the form, including placing the controls on the form.
  2. Writing the code to pre-populate the controls.
  3. Writing the code to perform actions after the dialog is used by the user.
Don’t recreate the wheel

ER Studio DA comes with quite a few working macros. They provide great examples on how to work with the objects and how to work with forms. I would recommend looking at the Definition Editor macro and the Index Naming macro. They both have highly interactive forms which show how to work with the different controls and how to interact with the events of the controls.

Note: While the objects representing the various aspects of the data model are well documented, I have yet to find documentation on the dialog object or the controls that are placed on it. I do admit, I have not tried contacting Embarcadero as of yet either.

Let’s look at the code from the Definition Editor macro.  The first line below begins the definition of the form followed by a list of controls that will appear on the form. The order they are listed will be the sequential order of the controls if you TAB through them. Below I numbered a few areas to look at.

  1. The first two numbers are the height and width of the form followed by the name that will appear in the title bar.
  2. The last parameter contains the name of the Sub that you would need to write to consume any actions generated by the form. (e.g. When you click the OK button, the MyDialogFunc procedure would be triggered.)
  3. At the end of controls that will cause an event, such as when a button is pushed, you will find a name preceded by a period. This is not a procedure name like we saw with #2 above. This will be the keyword you search for in the MyDialogFunc. We’ll see this in a minute.
  4. After the definition of the form is created, a variable is created to represent the form during its life.
  5. Next the controls that need to be initialized and pre-populated are coded.
  6. And Finally the call to the form is called which will display the form to the user.

 

AdventCalendar2013Day14_Img1

You can manually create and modify the form, or you can use the Editor User Dialog button on the toolbar. Make sure your cursor is in the middle of the code for the form, or you will create another form.

AdventCalendar2013Day14_Img2

When the myDialogFunc procedure is created, it requires three parameters.

  • DlgItem is the name of the control that caused an event, which caused the MyDialogFunc to be called.
  • Action is the action of the event. (e.g. A button was pushed.)
  • SuppValue contains the data of the DlgItem.

If you were to capture the pushbutton event for the UpdateTable, you would create an If statement to look at the DlgItem value when Action = 2.

There are some other functions that are needed while working the controls. In the screenshot below, you can see DlgValue and DlogText. These allow you to get information from other controls on the form. There are others that you look at in other macros as well.

AdventCalendar2013Day14_Img3

Can’t leave it alone

I really like this macro, but there was one issue. I use schemas (called owners in ER Studio DA), and I wanted them to be displayed with the table names… So I modified the code.

The first thing I did was to widen the list boxes. I like long names and they just didn’t fit. I used the User Dialog Editor to accomplish this.

The second thing I did, was add MyEntity.Owner to the name of the tables. This was done in the procedure called getTables.

 

Note: Tables are referenced differently in the logical model than the physical model. Make sure you are checking to see if the user executed the macro from the logical or physical model and then use the correct object.

 

 

AdventCalendar2013Day14_Img4

 

Previous Post In Series: SQL Advent Calendar – Day 13 – Snippet for New Transactional Procedure

Next Post In Series:  SQL Advent Calendar Day -15 – Naming Default Constraints

SQL Advent Calendar – Day 13 – Snippet for New Transactional Procedure

AdventCalendar13First Post in this series: SQL Advent Calendar 2013-Day 1- Placeholders in SQL Prompt Snippets

As I was hanging our family Advent Calendar up, I thought I would make one for you, my readers. I’ll be sharing my scripts from two of my favorite products as well as tips on how to create your own.

Begin Transaction

Two days ago, I shared my snippet to create a shell for new procedures. A week ago, I found I was writing quite a few update and insert procedures, so I created this new template called new_iu.

The procedures I’m creating are called by an application, so the template I created provides the following:

  • Begin and End Tran
  • Rollback in the error handler
  • Return statement. (0 is successful, anything else is a failure)
  • An output parameter that returns the number of rows changed. We needed this, because more that one kind of row was updated or inserted, but we only want to count the “main” units.

 

USE <DatabaseName, string,$DBNAME$>
GO

--Use Shift + Ctrl + M to set Template Parameters

IF EXISTS ( SELECT * FROM sys.objects WHERE	object_id = OBJECT_ID(N'<schemaowner,string,dbo>.<sprocname,string,>') AND type IN (N'P', N'PC') ) 
	DROP PROCEDURE <schemaowner,string,dbo>.<sprocname,string,>
GO
/* ***********************************************************************************
Purpose:    <purpose,string,[brief description]="">
Notes:      
Sample:    
            DECLARE @RV as int, @RecordsAffected as int
			EXEC @RV = <schemaowner,string,dbo>.<sprocname,string,> [Parameters],@RecordsAffected OUTPUT
			SELECT @RV as ReturnValue, @RecordsAffected as RecordsAffected
Author:     $USER$
Date:       $DATE$

Revision History
(Change Date)	(Author)		(Description of Change)
-----------------------------------------------------------------
************************************************************************************ */
CREATE PROCEDURE <schemaowner,string,dbo>.<sprocname,string,> 
(
	--Insert Parameters
	,@RecordsAffected AS int OUTPUT
)
AS 
BEGIN TRY
	SET NOCOUNT ON
----------------------------------------------------
-------           Test Parameters           --------
----------------------------------------------------
--DECLARE
--    @StartDate AS date = '12/1/2010'
--   ,@EndDate AS date = '12/5/2010'
--   ,@RecordsAffected AS int --OUTPUT
----------------------------------------------------
----------------------------------------------------
	BEGIN TRAN

		$CURSOR$--[TSQL Statements]

	COMMIT TRAN

END TRY
BEGIN CATCH
	DECLARE
		@ErrorMessage AS nvarchar(3000)
	   ,@ErrorSeverity AS int

	IF @@TRANCOUNT > 0
	BEGIN
        ROLLBACK TRAN
		SET @RecordsAffected = 0
	END 

	SET @ErrorMessage = ISNULL(DB_NAME(DB_ID()) + N'.' + SCHEMA_NAME(SCHEMA_ID()) + N'.' + OBJECT_NAME(@@PROCID, DB_ID()),
						N'SQL Object Name Not Available') + N': Error: ' + CONVERT(nvarchar(10), ERROR_NUMBER()) + N' Line: ' + CONVERT(nvarchar(5), ERROR_LINE()) + N' - '
						+ ERROR_MESSAGE()    
	SET @ErrorSeverity = ERROR_SEVERITY()
	RAISERROR(@ErrorMessage, @ErrorSeverity, 1)

	RETURN 1

END CATCH

SET NOCOUNT OFF
RETURN 0
GO
Commit Transaction

If you have other successful ways to write insert, update, or delete stored procedures, please share in the comments.

Note: You can download this snippet from my Script Library under Resources. It’s called New_IU.

Previous Post In Series: SQL Advent Calendar – Day 12 – And Neo Yelled
Next Post In Series: SQL Advent Calendar – Day 14 – Working With Forms in a Macro in ER Studio Data Architect

SQL Advent Calendar – Day 12 – And Neo Yelled

AdventCaledar12First Post in this series: SQL Advent Calendar 2013-Day 1- Placeholders in SQL Prompt Snippets

As I was hanging our family Advent Calendar up, I thought I would make one for you, my readers. I’ll be sharing my scripts from two of my favorite products as well as tips on how to create your own.

A Needed Siesta

We are half way to Christmas. Can you believe it? Writing this blog series has been great for me, but tonight I’m tired. So with that, I’m going to share some of the Snippets that come with SQL Prompt.

The first two are fun ones. Type Neo + TAB and Yell + TAB and see what you get. They always make me feel better.

If you really want to get into snippets, you can really save on the keep strokes with the following.

ssf SELECT * FROM
st100 SELECT TOP 100 *
FROM
cj CROSS JOIN
ij INNER JOIN
ob ORDER BY
gb GROUP BY

What other quick strokes do you think should be added?

Previous Post In Series: SQL Advent Calendar 2013 – Day 11 – Snippet For a New Stored Procedure
Next Post In Series: SQL Advent Calendar – Day 13 – Snippet for New Transactional Procedure

SQL Advent Calendar 2013 – Day 11 – Snippet For a New Stored Procedure

AdventCalendar11First Post in this series: SQL Advent Calendar 2013-Day 1- Placeholders in SQL Prompt Snippets

As I was hanging our family Advent Calendar up, I thought I would make one for you, my readers. I’ll be sharing my scripts from two of my favorite products as well as tips on how to create your own.

Save the Key Strokes!

The snippet below has saved me from a ton of typing! Just three little letters and TAB.

  • I always have a comment block.
  • I never have to add my name or date to the comment block.
  • My error handler always looks the same.
  • I even have a place for my test parameters.

This snippet, called affectionately New, provides the outer shell for a new stored procedure. It is ideal for non-transactional stored procedures. (I will later share my latest snippet created for transactional stored procedures.) It’s set up as a DROP / CREATE, and the DROP is wrapped in an IF statement so that it doesn’t fail the first time. Your cursor is placed right where your query needs to go. CTRL+SHIFT+M will populate the other unique parts of the script like database name, stored procedure name, etc.

USE <DatabaseName,string,$DBNAME$>
GO

--Use Shift + Ctrl + M to set Template Parameters

IF EXISTS ( SELECT * FROM sys.objects WHERE	object_id = OBJECT_ID(N'<schemaowner,string,dbo>.<sprocname,string,>') AND type IN (N'P', N'PC') ) 
	DROP PROCEDURE <schemaowner,string,dbo>.<sprocname,string,>
GO
/* ***********************************************************************************
Purpose:    <purpose,string,[brief description]="">
Notes:      
Sample:    
            EXEC <schemaowner,string,dbo>.<sprocname,string,> [Parameters]
Author:     $USER$
Date:       $DATE$

Revision History
(Change Date)	(Author)		(Description of Change)
-----------------------------------------------------------------
************************************************************************************ */
CREATE PROCEDURE <schemaowner,string,dbo>.<sprocname,string,> 
(
	--Insert Parameters
)
AS 
BEGIN TRY
	SET NOCOUNT ON
----------------------------------------------------
-------           Test Parameters           --------
----------------------------------------------------
--DECLARE 
--		@StartDate datetime = '12/1/2010'
--		,@EndDate datetime = '12/5/2010'
----------------------------------------------------
----------------------------------------------------

		$CURSOR$--[TSQL Statements]

END TRY
BEGIN CATCH

	DECLARE
	    @ErrorMessage AS nvarchar(3000)
	   ,@ErrorSeverity AS int

	SET @ErrorMessage = ISNULL(DB_NAME(DB_ID()) + N'.' + SCHEMA_NAME(SCHEMA_ID()) + N'.' + OBJECT_NAME(@@PROCID, DB_ID()),
						N'SQL Object Name Not Available') + N': Error: ' + CONVERT(nvarchar(10), ERROR_NUMBER()) + N' Line: ' 
						+ CONVERT(nvarchar(5), ERROR_LINE()) + N' - ' + ERROR_MESSAGE()   

	SET @ErrorSeverity = ERROR_SEVERITY()
	RAISERROR(@ErrorMessage, @ErrorSeverity, 1)
END CATCH

SET NOCOUNT OFF
GO
If You’re Brave…

Currently the $CURSOR$ placeholder is being used on line 37. This means you can immediately start typing your query. If you’re brave, you can change the placeholder to $PASTE$. This will put whatever is in your copy buffer directly in your new stored procedure. (I’m not that brave. Sometimes I have a lot of Excel Data hanging out, drinking spiked eggnog, and singing Karaoke in my copy buffer.)

 

AdventCalendar2013Day11_Img2

 

One of the cool features of this script, is the way the error handler is created. You can comment out lines 3 to 25 (the AS line)  and the error handler won’t fail. Instead of showing the stored procedure name (that you aren’t using) it will simply tell you, you are not in a stored procedure at the moment.

AdventCalendar2013Day11_Img1

 

I hope you enjoy this gem as much as I do.

Note: You can download this snippet from my Script Library under Resources. It’s called New.

Previous Post In Series: SQL Advent Calendar 2013 – Day 10 – Creating Change Tracking Domains (3 of 3)
Next Post In Series: SQL Advent Calendar–Day 12– And Neo Yelled

SQL Advent Calendar 2013 – Day 10 – Creating Change Tracking Domains (3 of 3)

AdventCalendar10First Post in this series: SQL Advent Calendar 2013-Day 1- Placeholders in SQL Prompt Snippets

As I was hanging our family Advent Calendar up, I thought I would make one for you, my readers. I’ll be sharing my scripts from two of my favorite products as well as tips on how to create your own.

The Final Piece

The last couple of days I’ve written here and here about how to add simple auditing to your tables using ER Studio Data Architect. Today is the finishing piece. Today I will share my SQL Prompt script that creates the triggers for the tables with the ModifiedBy and ModifiedDTS fields.

The trigger is an update trigger. Whenever the record is change, the trigger will be executed. If the user provided a value for the ModifieidBy field, then that value will be used. If a new value is not provided, then the SUSER_NAME() function will be used. I put that check in there for applications that use a single credential to log in to SQL Server, but the application can send in the actually user. If you don’t need that feature, then it can be taken out.

Before running the code, do the following.

  1. Use CTRL+SHIFT+M to update the script with the values you need. This will include a comma delimited list of table names, and a single schema name. (Eventually, I’ll add functionality for multiple schemas.)
  2. The script is setup to print the triggers to the Messages pane. You can copy the scripts into another window to execute, or you can set the @ReadyToExecute bit to 1. This will cause the scripts to be executed as the triggers are built.
WARNING: Make sure you verify that a trigger with the same name as the one being generated does not exists. IT WILL BE DROPPED with this code. ALSO, make sure adding this trigger, will not cause issues with other existing update triggers.

 

USE 
GO
/* ***********************************************************************************
Purpose:    Creates new update triggers for tables that use ModifiedDTS and ModifiedBy.
Notes:      1. Use Shift + Ctrl + M to set Template Parameters
			2. Change the @ReadyToexecute bit to 1, when you are ready to execute the
				code, or simply run the sqcript that is generated in the Messages pane.
WARNING: 	Make sure you verify that a trigger with the same name as the one being 
		generated  does not exists. IT WILL BE DROPPED with this code. ALSO, make 
		sure adding this trigger, will not cause issues with other existing 
		update trigers.
Author:     Mickey Stuewe, www.mickeystuewe.com
Date:       12/10/2013

Revision History
(Change Date)	(Author)		(Description of Change)
-----------------------------------------------------------------
************************************************************************************ */
DECLARE 
	@ReadyToExecute AS bit = 1

DECLARE
	 @Tables AS nvarchar(max) = ''
	,@SchemaName AS nvarchar(50) = '<schema,string,>'
	,@TriggerName AS nvarchar(200)
	,@TableName AS nvarchar(126)
	,@SQL AS nvarchar(MAX)
	,@PrimaryKeys_t_to_d AS nvarchar(MAX)
	,@PrimaryKeys_d_to_i AS nvarchar(MAX)

	DECLARE Trig_Cursor CURSOR	
		FOR 
			WITH cte_Pieces
			AS 
			(
				SELECT
					 1 AS ID
					,1 AS StartString
					,CONVERT(int,CHARINDEX(',', @Tables)) AS StopString
				UNION ALL
				SELECT
					ID + 1 AS ID
					,StopString + 1 AS StartString
					,CONVERT(int,CHARINDEX(',', @Tables, StopString + 1)) AS StopString
				FROM
					cte_Pieces
				WHERE
					StopString > 0
			)
			,cte_Tables
			AS
			(
				SELECT
					SUBSTRING(@Tables, StartString, CASE WHEN StopString > 0 THEN StopString - StartString
																ELSE LEN(@Tables)
														   END) AS TableName
				FROM
					cte_Pieces
			)
			SELECT 
				TableName
				,'trg_' + TableName + '_u' AS TriggerName
			FROM 
				cte_Tables

	OPEN Trig_Cursor
	FETCH NEXT FROM Trig_Cursor
	INTO 
		 @TableName
		,@TriggerName
	WHILE @@FETCH_STATUS = 0
	BEGIN

		--Get all the primary keys
		SET @PrimaryKeys_t_to_d = NULL
		SET @PrimaryKeys_d_to_i = NULL

		SELECT
			@PrimaryKeys_t_to_d = ISNULL(@PrimaryKeys_t_to_d  + SPACE(36) + 'AND ','') +  't.' + KCU.COLUMN_NAME + ' = d.' + KCU.COLUMN_NAME + CHAR(13) + CHAR(10) 
			,@PrimaryKeys_d_to_i = ISNULL(@PrimaryKeys_d_to_i + SPACE(36) + 'AND ','') +  'd.' + KCU.COLUMN_NAME + ' = i.' + KCU.COLUMN_NAME + CHAR(13) + CHAR(10) 

		FROM
			INFORMATION_SCHEMA.KEY_COLUMN_USAGE AS KCU
			JOIN INFORMATION_SCHEMA.TABLE_CONSTRAINTS AS TC ON KCU.CONSTRAINT_CATALOG = TC.CONSTRAINT_CATALOG
																				   AND KCU.CONSTRAINT_NAME = TC.CONSTRAINT_NAME
																				   AND KCU.CONSTRAINT_SCHEMA = TC.CONSTRAINT_SCHEMA
		WHERE
			tc.CONSTRAINT_TYPE = 'PRIMARY KEY'
			AND KCU.TABLE_NAME =  @TableName
			AND KCU.CONSTRAINT_SCHEMA = @SchemaName
		ORDER BY 
			KCU.ORDINAL_POSITION ASC

		--Drop existing Trigger
		SET @SQL = ''
		SET @SQL = @SQL +  N'IF  EXISTS (SELECT * FROM sys.triggers WHERE object_id = OBJECT_ID(N''[' + @SchemaName + '].[' +  @TriggerName +  ']''))' + CHAR(13) + CHAR(10)
		SET @SQL = @SQL +  N'DROP TRIGGER ' + @SchemaName + '.' +  @TriggerName	+ CHAR(13) + CHAR(10)

		--PRINT @SQL
		EXECUTE sp_executesql @SQL

		--CREATE New Trigger
		SET @SQL =		  N''																						
		SET @SQL = @SQL + N'/* ********************************************************************************'					+ CHAR(13) + CHAR(10)
		SET @SQL = @SQL + N'Template:	Created with template by Mickey Stuewe, www.mickeytsuewe.com'								+ CHAR(13) + CHAR(10)
		SET @SQL = @SQL + N'Purpose:	Set ModifiedDTS and ModifiedBy columns.'					 								+ CHAR(13) + CHAR(10)
		SET @SQL = @SQL + N'Notes:		ModifiedBy and ModifiedDTS will only changed if they were not changed'						+ CHAR(13) + CHAR(10)
		SET @SQL = @SQL + N'			by the user.'																				+ CHAR(13) + CHAR(10)
		SET @SQL = @SQL + N''																										+ CHAR(13) + CHAR(10) 
		SET @SQL = @SQL + N'Author:		$USER$'  																					+ CHAR(13) + CHAR(10)
		SET @SQL = @SQL + N'Date:		$DATE$' 																					+ CHAR(13) + CHAR(10)
		SET @SQL = @SQL + N''																										+ CHAR(13) + CHAR(10)
		SET @SQL = @SQL + N'Revision History'																						+ CHAR(13) + CHAR(10)
		SET @SQL = @SQL + N'(Change Date)	(Author)		(Description of Change)'												+ CHAR(13) + CHAR(10)
		SET @SQL = @SQL + N'-----------------------------------------------------------------'										+ CHAR(13) + CHAR(10)
		SET @SQL = @SQL + N' *********************************************************************************/'					+ CHAR(13) + CHAR(10)
		SET @SQL = @SQL + N'CREATE TRIGGER ' + @SchemaName + '.' +  @TriggerName +													+ CHAR(13) + CHAR(10)
		SET @SQL = @SQL + N'	ON ' + @SchemaName + '.' +  @TableName																+ CHAR(13) + CHAR(10)
		SET @SQL = @SQL + N'	AFTER UPDATE'																						+ CHAR(13) + CHAR(10)
		SET @SQL = @SQL + N'AS '																									+ CHAR(13) + CHAR(10)
		SET @SQL = @SQL + N'BEGIN'																									+ CHAR(13) + CHAR(10)
		SET @SQL = @SQL + N'	SET NOCOUNT ON'																						+ CHAR(13) + CHAR(10)
		SET @SQL = @SQL + N'	-- Update the ModifiedDTS/By fields if they are not passed in. '									+ CHAR(13) + CHAR(10)
		SET @SQL = @SQL + N'	UPDATE '																							+ CHAR(13) + CHAR(10)
		SET @SQL = @SQL + N'		' + @SchemaName + '.' +  @TableName + 															+ CHAR(13) + CHAR(10)
		SET @SQL = @SQL + N'	SET '																								+ CHAR(13) + CHAR(10)
		SET @SQL = @SQL + N'		 ModifiedBy = CASE '																			+ CHAR(13) + CHAR(10)
		SET @SQL = @SQL + N'						WHEN i.ModifiedBy IS NULL THEN SUSER_NAME() '									+ CHAR(13) + CHAR(10)
		SET @SQL = @SQL + N'						WHEN i.ModifiedBy <> d.ModifiedBy THEN i.ModifiedBy '							+ CHAR(13) + CHAR(10)
		SET @SQL = @SQL + N'						WHEN ISNULL(i.ModifiedDTS,d.ModifiedDTS) = d.ModifiedDTS THEN SUSER_NAME() '	+ CHAR(13) + CHAR(10)
		SET @SQL = @SQL + N'						ELSE i.ModifiedBy '																+ CHAR(13) + CHAR(10)
		SET @SQL = @SQL + N'						END '																			+ CHAR(13) + CHAR(10)
		SET @SQL = @SQL + N'		,ModifiedDTS = GETDATE() '																		+ CHAR(13) + CHAR(10)
		SET @SQL = @SQL + N'	FROM '																								+ CHAR(13) + CHAR(10)
		SET @SQL = @SQL + N'		' + @SchemaName + '.' +  @TableName + ' AS t '													+ CHAR(13) + CHAR(10)
		SET @SQL = @SQL + N'		INNER JOIN deleted AS d ON ' + @PrimaryKeys_t_to_d												
		SET @SQL = @SQL + N'		INNER JOIN inserted AS i ON ' + @PrimaryKeys_d_to_i												+ CHAR(13) + CHAR(10)
		SET @SQL = @SQL + N'	SET NOCOUNT OFF'																					+ CHAR(13) + CHAR(10)
		SET @SQL = @SQL + N'END '																									+ CHAR(13) + CHAR(10)

		IF @ReadyToExecute = 0
		BEGIN
			SET @SQL = @SQL + N'GO '																									+ CHAR(13) + CHAR(10)

			PRINT @SQL
		END
		ELSE
		BEGIN
			EXECUTE sp_executesql @SQL
		END

		IF  EXISTS (SELECT * FROM sys.triggers WHERE object_id = OBJECT_ID(N'[' + @SchemaName + '].[' +  @TriggerName +  ']')) 
			PRINT '--CREATED TRIGGER ' + @SchemaName + '.' +  @TriggerName
		ELSE
			PRINT '--*** TRIGGER ' + @SchemaName + '.' +  @TriggerName + ' was not created.***'

		FETCH NEXT FROM Trig_Cursor
		INTO 
			@TableName
			,@TriggerName
	END
	CLOSE Trig_Cursor
	DEALLOCATE Trig_Cursor

GO

Here is an example of what the trigger will look like. This example has a three part primary key.

AdventCalendar2013Day10_Img1

Previous Post In Series: SQL Advent Calendar 2013 – Day 9 – Creating Change Tracking Fields (2 of 3)

SQL Advent Calendar 2013 – Day 9 – Creating Change Tracking Fields (2 of 3)

AdventCalendar09First Post in this series: SQL Advent Calendar 2013-Day 1- Placeholders in SQL Prompt Snippets

As I was hanging our family Advent Calendar up, I thought I would make one for you, my readers. I’ll be sharing my scripts from two of my favorite products as well as tips on how to create your own.

Second Step Is Creating The Change Tracking Fields

Today I’ll share with you my macro called Add Change Tracking Attributes. This script will add the attributes InsertedBy, InsertedDTS, ModifiedBy, and ModifiedDTS to the selected entities. These attributes are based on the domains that were created by the macro in yesterday’s post found here. If you add these fields, and then decide you don’t want them, you can use my macro called Remove Attribute From Selected Tables, which I blogged about here to remove them.

'----------------------------------------------------------------------------
' PURPOSE:  	This macro adds Change Tracking Attributes to Selected Entities.
' Author:   	Mickey Stuewe
' Date:     	12/9/2013
'----------------------------------------------------------------------------

Sub Main

	Dim objModel As Model
	Dim objSelObject As SelectedObject
	Dim objEntity As Entity
	Dim objAttribute As AttributeObj
	Dim iCounter As Integer
	Dim dict As Dictionary
	Dim iInsertedDateID As Integer
	Dim iInsertedByID As Integer
	Dim iModifiedByID As Integer
	Dim iModifiedDateID As Integer

	' Get the Local Data Dictionary.
	Set dict = DiagramManager.ActiveDiagram.Dictionary

    ' Determine Domains.
    Set MyDomain = dict.Domains.Item("InsertedDTS")
    iInsertedDateID = MyDomain.ID

    Set MyDomain = dict.Domains.Item("InsertedBy")
    iInsertedByID = MyDomain.ID

    Set MyDomain = dict.Domains.Item("ModifiedDTS")
    iModifiedDateID = MyDomain.ID

    Set MyDomain = dict.Domains.Item("ModifiedBy")
    iModifiedByID = MyDomain.ID

	Set objModel = DiagramManager.ActiveDiagram.ActiveModel

	' Iterate through all the selected objects in the current
	' model.
	For Each objSelObject In objModel.ActiveSubModel.SelectedObjects

		'Get the object type - we are only concerned
		'with entities.
		If objSelObject.Type = 1 Then

			' Get the actual entity object with this ID.
			' The model contains the collection of all the
			' entities.
			Set objEntity =  objModel.Entities.Item(objSelObject.ID)

			'Create Tracking fields and set DomainIDs
			Set objAttribute = objEntity.Attributes.Add("InsertedBy", False)
			 SetDefaultDomain objAttribute, iInsertedByID,objEntity.EntityName

			Set objAttribute = objEntity.Attributes.Add("InsertedDTS", False)
			SetDefaultDomain objAttribute, iInsertedDateID,objEntity.EntityName

			Set objAttribute = objEntity.Attributes.Add("ModifiedBy", False)
			SetDefaultDomain objAttribute, iModifiedByID,objEntity.EntityName

			Set objAttribute = objEntity.Attributes.Add("ModifiedDTS", False)
			SetDefaultDomain objAttribute, iModifiedDateID,objEntity.EntityName

			iCounter = iCounter + 1
		End If
	Next objSelObject

	MsgBox "Four new Attributes were added to " & iCounter & " Table(s).", vbOkOnly + vbInformation, "Attributes Added To Tables"

End Sub

Sub SetDefaultDomain(objAttribute As AttributeObj, iDomainID As Integer, strEntityName As String)

	objAttribute.DomainId = iDomainID

	If Len(objAttribute.DeclaredDefault) > 0 Then

		'if the attribute default is bound, then unbind it so that it can be named.
		If objAttribute.DomainId > 0 Then
			'You have to override the bound default value and the default text (name).
			objAttribute.EnableOverride (1,True)
			objAttribute.EnableOverride (2,True)

		End If

		If Len(objAttribute.DefaultName) = 0 Then
			objAttribute.DefaultName = "DF_" & strEntityName & "_" & objAttribute.AttributeName

		ElseIf objAttribute.DefaultName <> "DF_" & strEntityName & "_" & objAttribute.AttributeName Then
			If MsgBox("The name of the Default Constraint does not match our naming standards. Would you like to replace it?" & vbCrLf & _
				vbCrLf & vbCrLf & "Attribute: " & objAttribute.AttributeName & " - Default Name: " & objAttribute.DefaultName & " - Value: " & _
				objAttribute.DeclaredDefault & vbCrLf & " Standardized Name: " & "DF_" & strEntityName & "_" & objAttribute.AttributeName, _
				vbYesNo + vbQuestion, "Stadardize Name?") = vbYes Then
					objAttribute.DefaultName = "DF_" & strEntityName & "_" & objAttribute.AttributeName

			End If
		End If
	End If
End Sub

Take a look at lines 81 and 82. These two lines are needed to be able to give the default a name and here is why: This macro creates attributes based off of domains. The Inserted attributes have defaults. If we don’t name the defaults, then SQL Server will provide names for them…and they are not pretty. In order for us to be able to override the domain, we have to set the enableoverride property for two properties. Then we’ll be able to provide a name to the default. This step can’t be done in the domain, because defaults are a type of constraint and all constraints need to have unique names.

Tomorrow I’ll show you a Red Gate Snippet used to create the triggers for the tables with these fields.

Previous Post In Series: SQL Advent Calendar 2013-Day 8-Creating Change Tracking Domains (1 of 3)

SQL Advent Calendar 2013 – Day 8 – Creating Change Tracking Domains (1 of 3)

AdventCalendar08First Post in this series: SQL Advent Calendar 2013-Day 1- Placeholders in SQL Prompt Snippets

As I was hanging our family Advent Calendar up, I thought I would make one for you, my readers. I’ll be sharing my scripts from two of my favorite products as well as tips on how to create your own.

First Step Is The Foundation

Whenever I need to have minimal auditing on a table, I add four fields to the table. InsertedBy, InsertedDTS, Modifiedby, and ModifiedDTS. The Inserted fields tell me who created the row. These two fields are updated based on the defaults set on the columns. The Modified fields tell me who changed the fields and are updated by a trigger.

Over the next couple of days I will show you two ER/Studio Data Architect (ER Studio DA) macros and one SQL Prompt Script that will help you create these four fields and the needed triggers.

The first step is making sure that your data model has four Domains. They reside in the Data Dictionary on the Data Dictionary tab. Domains are templates that fields can be created against.

There are two types of Data Dictionaries. There are local Data Dictionaries and Enterprise Data dictionaries. A data model can only have one local Data Dictionary and it always exists. If you are using ER Studio DA’s Repository feature, then you can create an Enterprise Data Dictionary to use across al Data Models. A Data Model can have multiple Enterprise Data Dictionaries. This is a great feature and I have used it in the past, but it isn’t available if you are not using the Repository.

 

AdventCalendar2013Day8_Img1

 

I’ve created a macro called Create Change Tracking Domains to use the local Data Dictionary.

The macro does the following: If a folder called Change Tracking doesn’t exist in the Data Dictionary, then it is created. If the four change tracking domains don’t exist, then they will be created. Either way, all the properties of these four domains will either be created or reset when this macro is run.

Note: You can modify it to use an Enterprise Data Dictionary, or you can see if I have time to add it to the macro for you.

Below, in the code. You can see the properties that are set for each field (Data type, name, definition, nullability, and default.)

'----------------------------------------------------------------------------
' PURPOSE:  	This macro adds four domains to aid in creating Change Tracking
'				fields.
' Author:   	Mickey Stuewe
' Date:     	12/9/2013
'----------------------------------------------------------------------------

Sub Main

	Dim dict As Dictionary

	' Get the Local Data Dictionary.
	Set dict = DiagramManager.ActiveDiagram.Dictionary

	'If the Change Tracking folder does not exist, then add it.
	If (dict.DomainFolders.Item("Change Tracking") Is Nothing) Then
		dict.DomainFolders.Add("Change Tracking","Domains")
	End If

    ' if Domain doesn't exist, then create it.
	If (dict.Domains.Item("InsertedDTS") Is Nothing) Then
		dict.Domains.Add("InsertedDTS", "InsertedDTS")
	End If

	With dict.Domains.Item("InsertedDTS")
		.AttributeName = "InsertedDTS"
		.Datatype="DateTime"
		.DeclaredDefault = "GETDATE()"
		.Definition = "This is the date the row that was inserted."
		.DomainFolder = "Change Tracking"
		.Nullable = False
	End With

    ' if Domain doesn't exist, then create it.
	If (dict.Domains.Item("InsertedBy") Is Nothing) Then
		dict.Domains.Add("InsertedBy", "InsertedBy")
	End If

	With dict.Domains.Item("InsertedBy")
		.AttributeName = "InsertedBy"
		.Datatype = "nvarchar"
		.DataLength = 255
		.DeclaredDefault = "SUSER_NAME()"
		.Definition = "This is the system user who created the row."
		.DomainFolder = "Change Tracking"
		.Nullable = False
	End With

	 ' if Domain doesn't exist, then create it.
	If (dict.Domains.Item("ModifiedDTS") Is Nothing) Then
		dict.Domains.Add("ModifiedDTS", "ModifiedDTS")
	End If

	With dict.Domains.Item("ModifiedDTS")
		.AttributeName = "ModifiedDTS"
		.Datatype="DateTime"
		.Definition = "This is the date the row was modified. It is updated via a trigger."
		.DomainFolder = "Change Tracking"
		.Nullable = True
	End With

 	' if Domain doesn't exist, then create it.
	If (dict.Domains.Item("ModifiedBy") Is Nothing) Then
		dict.Domains.Add("ModifiedBy", "ModifiedBy")
	End If

	With dict.Domains.Item("ModifiedBy")
		.AttributeName = "ModifiedBy"
		.Datatype = "nvarchar"
		.DataLength = 255
		.Definition = "This is the system user who modified the row. It is updated via a trigger."
		.DomainFolder = "Change Tracking"
		.Nullable = True
	End With

	Set dict = Nothing
End Sub

Tomorrow I’ll share the macro that will add these four fields to selected tables.

Previous Post In Series: SQL Advent Calendar – Day 7 – Verify All Tables and Fields Have a Definition

Next Post in Series: SQL Advent Calendar 2013 – Day 9 – Creating Change Tracking Fields (2 of 3)

%d bloggers like this: