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Can I load one dataset with more than one datatables in this way?

Posted on 2006-07-12
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Last Modified: 2010-04-23
I tried the following in vs 2003 win form app.

Dim arParms() As SqlParameter = New SqlParameter(0) {}
        arParms(0) = New SqlParameter("@P1", SqlDbType.VarChar)
        arParms(0).Value = JobID
            dsOrder = SqlHelper.ExecuteDataset(cn_str_W, CommandType.StoredProcedure, "CT_getOrder", arParms)
            dsOrder.Tables(0).TableName = "order"
            dsOrder = SqlHelper.ExecuteDataset(cn_str_Q, CommandType.StoredProcedure, "CT_getProduct", arParms)
            dsOrder.Tables(1).TableName = "Product"

I got index out of range exception on last line. How do I set the index first? The code is fine if I removed last two lines.

Thanks!
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Question by:ommer
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7 Comments
 
LVL 24

Expert Comment

by:Jeff Certain
ID: 17094837
We'd need to see SqlHelper. However, you're assigning the output from ExecuteDataset to the dataset twice, which means that you're overwriting the dataset the second time you call it. So, effectively, you're only making the second call.
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Author Comment

by:ommer
ID: 17095472
The sqlHelper class is from Microsoft Data Access Application Block. I don't have the source code right now.

Anyway, as I understand, one dataset can have many data tables in it. This is new to me, given my ado recordset background. How do you typically load the 2nd table to the dataset? Do you have to make the stored procedures returns multiple sets, or do I need to "pre-dimension" the dataset-datatables?

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LVL 24

Expert Comment

by:Jeff Certain
ID: 17095638
Generally, you'd load the second set of data into a table, then add that table to the dataset...
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LVL 17

Expert Comment

by:ZeonFlash
ID: 17096227
A fan of SqlHelper myself, I've tinkered around and found that you can do the following (assuming that your 2nd execution will return only 1 table):

dsOrder = SqlHelper.ExecuteDataset(cn_str_W, CommandType.StoredProcedure, "CT_getOrder", arParms)
dsOrder.Tables(0).TableName = "order"
dsOrder.Tables.Add(SqlHelper.ExecuteDataset(cn_str_Q, CommandType.StoredProcedure, "CT_getProduct", arParms).Tables(0))
dsOrder.Tables(1).TableName = "Product"
0
 

Author Comment

by:ommer
ID: 17099359
ZeonFlash,

When I use next line from your reply, do I use ...Tables(0) or ...Tables(1)? It seems neither works for me.

dsOrder.Tables.Add(SqlHelper.ExecuteDataset(cn_str_Q, CommandType.StoredProcedure, "CT_getProduct", arParms).Tables(0))

Thank a lot!
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LVL 17

Accepted Solution

by:
ZeonFlash earned 50 total points
ID: 17100174
Yikes, oversight on my part.  You're probably getting a "DataTable already belongs to another DataSet" error.  You need to create a copy of the table to add to the dataset, not use the one returned by SqlHelper directly.  Try this:

dsOrder.Tables.Add(SqlHelper.ExecuteDataset(cn_str_Q, CommandType.StoredProcedure, "CT_getProduct", arParms).Tables(0).Copy)

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Author Comment

by:ommer
ID: 17100786
Yap, that works. It will save me couple datasets. More importantly, I have learnt the dotnet way. Thanks!
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