How to go through a datatable row by row and column by column
Hello, I have a dataset with a datatable and I need to insert each row from the datatable on my sql table, anyway there may be errors, so some rows may not be inserted because primary key constraints, So I need to show the rows that are not inserted in a gridview, the hard thing to do is to go through all the datatable, is there an wasy way to do it?
MCPD ENTERPRISE APPLICATION DEVELOPER
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luisevalencia
11/22/2005 1:18:33 PM
asp.net.presentation-controls
72751 articles. 
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8 Replies
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Start by looking here
http://msdn2.microsoft.com/en-us/library/system.data.common.dataadapter.update.aspx
Perform an update of your dataset, and if a row fails, you can mark it as invalid.
You can then easily create a view from the datatable containing only rows that have failed
If it was easy, everybody would be doing it.
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sbyard
11/22/2005 3:16:54 PM
I think I need to make the following
1. Insert the info from the excel file into the dataset.
2. Define a dataadapter.
3. Define the insert command of the dataadapter.
4. Put the update inside a try catch
5. Inside the catch which exception should I use to see if there was a row that could not be inserted?
6. How can I mark a row as invalid?
Thanks
Is this how this must be done ? Or do you recommend me another way ?
MCPD ENTERPRISE APPLICATION DEVELOPER
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luisevalencia
11/22/2005 3:33:19 PM
And just for reference on the looping:
Dim dt1 As DataTable = ds1.Tables(0)
For Each dr As DataRow in dt1.Rows
For i As Integer = 0 to (dt1.Columns.Count -1)
dr.Item(i) <<<<< Current column value going from left to right
dt1.Columns(i).ColumnName <<<<< if you need the name of the column
Next
Next
"If you make it idiot proof, they'll build a better idiot"
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MorningZ
11/22/2005 4:12:37 PM
Have a look at the following for data errors, adapters, and tables.
http://msdn2.microsoft.com/library/6d1wk41s(en-us,vs.80).aspxWhat you need to do is work with the data adapter events.
If you use a database that supports transactions, you can attempt an update inside a transacrion, get the errors, roll back, then report the rows in error back to the user to correct, then try again, etc.
You can also write a DTS job in SQL Server to import the data direct from an external source such as Excel, rather than write code. You can pick up rows in error from teh DTS job into another table, and write some .Net code to handle just the errors and subsequent updates
If it was easy, everybody would be doing it.
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sbyard
11/23/2005 9:03:12 AM
I cant use DTS because its Sql Express.
MCPD ENTERPRISE APPLICATION DEVELOPER
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luisevalencia
11/23/2005 12:29:05 PM
DTS isn't part of SQL Server. It's a separate application that SQL Server uses and hosts, so you don't need SQL Server at all (you can program DTS classes via COM using (Microsoft.SqlServer.Dts.Runtime). You can write DTS packages and create a file that can be run by the DTS executable, maybe developing them on a SQL Server proper, and simply adding the DTS package to the project.
DTS is now Notification Services, which I haven't had time to look at yet
As DTS might be a bit over the top for your needs, I would suggest looking into to data adapter route
If it was easy, everybody would be doing it.
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sbyard
11/23/2005 4:24:10 PM
Dts is now Integration Services not Notification Services.
Anyway I will use the data adapter route, I hate COM
MCPD ENTERPRISE APPLICATION DEVELOPER
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luisevalencia
11/23/2005 4:29:11 PM
Sorry about that - My fingers didn't type what I was thinking!
Let us know when you get it working. Good luck
If it was easy, everybody would be doing it.
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sbyard
11/23/2005 6:14:58 PM
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