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Editorial Team
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Asked: 2026-06-12T18:15:28+00:00

I write on MySQL 5.5, C#, ADO.NET, DataSet. I have a DataSet and DataAdapter

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I write on MySQL 5.5, C#, ADO.NET, DataSet.
I have a DataSet and DataAdapter filled it. In DataAdapter I override INSERT, UPDATE, DELETE commands. When I use stored procedures, as these commands, all is well.
However, when I use transactionns in this stored procedures, I get an exception:

Concurrency violation: the DeleteCommand affected 0 of the expected 1 records.

What can I do with this errors?

Sample: http://dl.dropbox.com/u/46828938/DataGridSample.zip

To reproduce the problem: Delete row from Datagrid and press “Update” button.

DBConcurrencyException (“Concurrency violation: the DeleteCommand affected 0 of the expected 1 records.”) reproduce on:”productDataAdapter.Update(dataSet, “Products”);” string.

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1 Answer

  1. Editorial Team

    I learning a lot of documentations about this problem (msdn, mysql forum, stackoverflow, etc) and see:

    Check real concurrency or not possibility do additional queries:

    1. insert: get last inserted row and comparision with inserted row.
    2. update: get updated row (by key for example) and comparision with updated row.
    3. delete: try get row (by key for example) and get null.

    Of course, all described above comparisions nessesary do in one logical bath / connection etc.
    Unfortunately other way check ‘”Concurrency violation” or not on MySql’ isn’t exist. (In defference from others db servers).

    I hope, that this information helps someone.

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