Solved

COMMAND OBJECT - SET OUTPUT PARAMETER

Posted on 2002-07-11
5
187 Views
Last Modified: 2011-04-14
Hi experts,

I discovered the Data Environement Object, and I can't really get it to work my way.

First what I want it to get the Max Value of a field, and I was hoping to accomplish this with a single call to the command like:

MySort = MyDE.MyCommand (MyParent)

MyTable (table name) has the following fields:

MyId, MyName, MyParent, MySort

I would like to get the maximum value of the MySort field grouped by MyParent. I would like to do this all in the Data Environement (Command object) and not in the database directly. I will tell you what I did, and you please tell me where I went wrong ...

1. I created a Command Object and used a SQL-statement like:

SELECT MyTable.* FROM MyTable ORDER BY MyParent, MySort

Resulting Recordset:

MyId     MyName             Parent     Sort
0     MyGroups     0     0
6     Main1             0     1
7     Main2               0     2
1     Main3             0     4
5     Main4             0     5
2     Main5             0     6
3     Sub1             1     1
4     Sub2         1     2


2. I grouped it by MyParent.

3. I put the aggregate to Max (field: MySort)

Now the result is:

My parent / My Sort
0  /  6
1  /  2

4. In order to get a parameter I change the SQL to:

SELECT tblGroups.* FROM tblGroups WHERE GrpParent = ? ORDER BY GrpParent, GrpSort

Now the code looks like:

MyDE.ByParent (MyParent)

MyDE = Data Environement Object name
ByParent = Command objects - grouping name
MyParent = Variable that contains a parameter value


That's what I want. Then I thought I need only 1 value to be returned, not a recordset. I was thinking of adding a output parameter, and uncheck the "recordset returning" checkbox on the advanced tab of the command object properties.

How can I put an output parameter at design-time?
How can I access this value now? In code I mean.
How can I set the default value to "1" in case there are no records that match the criteria?
How can I add the value "1" to the returned value in the command object itself?

The command name is MyCommand.
The Grouping name is ByParent
The Aggregate name is MaxSort

I hope you understand.

Thanks ...

BL
0
Comment
Question by:beni_luedi
  • 2
  • 2
5 Comments
 
LVL 5

Expert Comment

by:rpai
ID: 7149976
To return only one record per MyParent, you can write a SQL statement like this:-
sSQL =  " SELECT Max(MySort), MyParent" & _
          " FROM tblGroups" & _
         " WHERE GrpParent = ? " & _
      " GROUP BY MyParent"

0
 

Author Comment

by:beni_luedi
ID: 7150927
How can I put an output parameter at design-time?
How can I access this value now? In code I mean.
How can I set the default value to "1" in case there are no records that match the criteria?
How can I add the value "1" to the returned value in the command object itself?
0
 
LVL 5

Expert Comment

by:rpai
ID: 7151486
Where do you want to put the output parameter?
Can you not use ADODB object model to accomplish your requirement?
0
 

Author Comment

by:beni_luedi
ID: 7151538
I want to put the output parameter together with the input parameter into the command object of the data environement designer (at design time).

Do you mean writing code to create a ADO command object with it's properties and parameters?

I would like to know if I can accoplish the same directly in the data environment's command object at design time.

Is this possible? If yes, HOW?
0
 
LVL 4

Accepted Solution

by:
AlonHirsch earned 100 total points
ID: 7153744
Hi,

Typically OUTPUT parameters are used when you call a stored procedure in SQL Server (ORACEL etc.).
The stored procedure uses Parameters for the query and has the option of returning data in one or more of the parameters.

You can't use output parameters with a direct SQL query as you are trying.

HTH,
Alon
0

Featured Post

Gigs: Get Your Project Delivered by an Expert

Select from freelancers specializing in everything from database administration to programming, who have proven themselves as experts in their field. Hire the best, collaborate easily, pay securely and get projects done right.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

When trying to find the cause of a problem in VBA or VB6 it's often valuable to know what procedures were executed prior to the error. You can use the Call Stack for that but it is often inadequate because it may show procedures you aren't intereste…
If you have ever used Microsoft Word then you know that it has a good spell checker and it may have occurred to you that the ability to check spelling might be a nice piece of functionality to add to certain applications of yours. Well the code that…
Get people started with the process of using Access VBA to control Outlook using automation, Microsoft Access can control other applications. An example is the ability to programmatically talk to Microsoft Outlook. Using automation, an Access applic…
Show developers how to use a criteria form to limit the data that appears on an Access report. It is a common requirement that users can specify the criteria for a report at runtime. The easiest way to accomplish this is using a criteria form that a…

808 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question