You may need to call AcceptChanges first (not sure) and you have to not use optimistic concurrency.ģ. How you would determine which those are is up to you. After adding all the rows, loop through the DataTable and call SetModified on those rows that need to be updated rather than inserted. You'll then get the Modified rows to execute the UpdateCommand.Ģ. Retrieve all the data from the database into the DataTables first, then modify the existing rows if there's a match or else add a new row. There are several ways to make it work the way you want:ġ. Your problem is that, if you add rows from your spreadsheet, they will all have a RowState of Added and thus the table/data adapter will try to insert them. Unchanged means that there's nothing to do, Added means execute the InsertCommand, Modified means execute the UpdateCommand and Deleted means execute the DeleteCommand. If you follow the CodeBank link in my signature below, you'll find one or two threads that deal with data access that may help.Įach DataRow in your DataTables has a RowState property that indicates what needs to be done when you call Update. A table adapter is just a wrapper for a data adapter that is customised for your data too.
#Visual basic data set code
This makes writing code easier as you get help from Intellisense and compile-time checking of names, types,etc. A typed DataSet is just like an untyped DataSet - it inherits the same classes - but has some extra members that are specific to your data. Each of those command objects contains a connection object - usually the same one - that determines the database they are executed against.
#Visual basic data set update
With an untyped DataSet, you use one data adapter per DataTable, where the Fill method invokes the SelectCommand to retrieve data and the Update method invokes the InsertCommand, UpdateCommand and DeleteCommand as required to save changes. Thanks for all the great help on this forum! Everything I've read online takes me through the steps of writing the connection string. It seems to me if I am able to see this data model through the DataSet, I should be able to just reference those objects and not have to write any kind of connection string, since this is how the dataset was created to begin with. I have probably asked similar questions about this before, so my apologies ahead of time.
#Visual basic data set how to
Is there not a way to just use the current 'JobSheetDataSet.xsd' file to insert the data? I am a little confused, and would not mind an overview of DataSets, DataTables and Data Adapters so I can understand how to accomplish this. I do not care to see any datagrids for this information, just populate the data. I want to take this array information and now add records, or update if they already exist. I have a bunch of raw data read from spreadsheets and populated to arrays.
I have a Visual Basic Program and have created a DataSet through the GUI which represents my three table database in SQL Server with all the defined relationships.
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