Check For Column Existance Before Alter Table Statement

Feb 14, 2000

Hello all,

I am trying to add columns to several tables in a singular database. I want to check to see if the column exists in a given table first before executing the alter table command so that I can skip that command if the column already exists, and avoid aborting my script prematurely. I can't seem to find a way to check for the column's existance. Any suggestions?

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Sep 10, 2004

Within the execution of a t-sql script how do I check for the existance of a temporary table associated with the session or a global temporary table?

My understanding is that the table name doesn't get placed in the current database sysobjects table - it goes into tempdb. But the object name is cryptic (so as to be unique) and I see no way of associating it with the current session (@@SPID).

Thanks,
Fred

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Sep 7, 2007

Hi guys,
If I have a temporary table called #CTE
With the columns
[Account]
[Name]
[RowID Table Level]
[RowID Data Level]
and I need to change the column type for the columns:
[RowID Table Level]
[RowID Data Level]
to integer, and set the column [RowID Table Level] as Identity (index) starting from 1, incrementing 1 each time.
What will be the right syntax using SQL SERVER 2000?

I am trying to solve the question in the link below:
http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=2093921&SiteID=1

Thanks in advance,
Aldo.

I have tried the code below, but getting syntax error...



ALTER TABLE #CTE
ALTER COLUMN
[RowID Table Level] INT IDENTITY(1,1),
[RowID Data Level] INT;


I have also tried:

ALTER TABLE #CTE
MODIFY
[RowID Table Level] INT IDENTITY(1,1),
[RowID Data Level] INT;







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Jul 3, 2006

Hi all,

Let me apologize in advance for what I know is a very basic question,
but so far I'm not being terribly successful trying to find sample code
to learn from.



I'm trying to write (my first!) .Net Script in SSIS to check for the
existance of a file (since that seems to be the only way to do it).



I've created the Script Task, with the following settings:

PrecomplieScriptIntoBinaryCode = False (it complained at one point in time (possibly on validation))

EntryPoint = ScriptMain

ReadOnly Variables = ProductBuyListFileLocation, ProductBuyListFileName

ReadWrite Variable = FileFound



Now the ReadOnly variables have the 2 components necessary for a file location, i.e.:

ProductBuyListFileLocation = 'D:TestingProductInformationEnhancements'

ProductBuyListFileName = 'buyList.xls'



So, I'm now trying to check the existance with the following .Net Script code:

-------code--------

Imports System

Imports System.Data

Imports System.Math

Imports System.IO

Imports Microsoft.SqlServer.Dts.Runtime



Public Class ScriptMain



' The execution engine calls this method when the task executes.

' To access the object model, use the Dts object. Connections, variables, events,

' and logging features are available as static members of the Dts class.

' Before returning from this method, set the value of Dts.TaskResult to indicate success or failure.

'

' To open Code and Text Editor Help, press F1.

' To open Object Browser, press Ctrl+Alt+J.



Public Sub Main()

'

' Add your code here

'

Dim FileLocation As String

Dim DTSVariables As Variables



If
System.IO.File.Exists((CStr(DTSVariables("ProductBuyListFileLocation").Value)
+ (CStr(DTSVariables("ProductBuyListFileLocation").Value)))) Then

DTSVariables("FileFound").Value = 1

Else

DTSVariables("FileFound").Value = 0

End If

Dts.TaskResult = Dts.Results.Success

End Sub



End Class

-------code--------



if fails with this message, which I'm not finding too helpful:

at
ScriptTask_6c9d28f1bd3045739c4237bd588e3835.ScriptMain.Main() in
dts://Scripts/ScriptTask_6c9d28f1bd3045739c4237bd588e3835/ScriptMain:line
28



Is it complaining about not being able to find/address my ReadOnly variable? If so, what am I doing wrong?



TIA

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SSIS Script Task To Check For File Existance

Jul 3, 2006

Hi all,

Let me apologize in advance for what I know is a very basic question,
but so far I'm not being terribly successful trying to find sample code
to learn from.



I'm trying to write (my first!) .Net Script in SSIS to check for the
existance of a file (since that seems to be the only way to do it).



I've created the Script Task, with the following settings:

PrecomplieScriptIntoBinaryCode = False (it complained at one point in time (possibly on validation))

EntryPoint = ScriptMain

ReadOnly Variables = ProductBuyListFileLocation, ProductBuyListFileName

ReadWrite Variable = FileFound



Now the ReadOnly variables have the 2 components necessary for a file location, i.e.:

ProductBuyListFileLocation = 'D:TestingProductInformationEnhancements'

ProductBuyListFileName = 'buyList.xls'



So, I'm now trying to check the existance with the following .Net Script code:

-------code--------

Imports System

Imports System.Data

Imports System.Math

Imports System.IO

Imports Microsoft.SqlServer.Dts.Runtime



Public Class ScriptMain



' The execution engine calls this method when the task executes.

' To access the object model, use the Dts object. Connections, variables, events,

' and logging features are available as static members of the Dts class.

' Before returning from this method, set the value of Dts.TaskResult to indicate success or failure.

'

' To open Code and Text Editor Help, press F1.

' To open Object Browser, press Ctrl+Alt+J.



Public Sub Main()

'

' Add your code here

'

Dim FileLocation As String

Dim DTSVariables As Variables



If
System.IO.File.Exists((CStr(DTSVariables("ProductBuyListFileLocation").Value)
+ (CStr(DTSVariables("ProductBuyListFileLocation").Value)))) Then

DTSVariables("FileFound").Value = 1

Else

DTSVariables("FileFound").Value = 0

End If

Dts.TaskResult = Dts.Results.Success

End Sub



End Class

-------code--------



if fails with this message, which I'm not finding too helpful:

at
ScriptTask_6c9d28f1bd3045739c4237bd588e3835.ScriptMain.Main() in
dts://Scripts/ScriptTask_6c9d28f1bd3045739c4237bd588e3835/ScriptMain:line
28



Is it complaining about not being able to find/address my ReadOnly variable? If so, what am I doing wrong?



TIA

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http://www.blogcoward.com/archive/2005/05/09/234.aspx[^]
Does anyone know about that?


Thanks,
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