What value should .net SqlCommand.ExecuteNonQuery() return if no rows are affected?
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Published on 2010-05-27T14:13:38Z
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2010/05/27
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I have the following code:
int result = -1;
StringBuilder sb = new StringBuilder();
SqlCommand cmd = MyConnection.
sb.AppendLine("delete from Table1 where ID in");
sb.AppendLine("(select id from Table1 t1 where not exists(select * from Table2 t2 where t2.Table1ID = t1.ID))");
cmd.CommandText = sb.ToString();
result = cmd.ExecuteNonQuery();
_log.Info("StoredXMLDocument Records Deleted: " + result.ToString());
That SQL, in a more readable format, is:
delete from Table1 where ID in
(select id from Table1 t1 where not exists(select * from Table2 t2 where t2.Table1ID = t1.ID))
I know that the SQL, when executed directly in the database, deletes no rows. When this code runs, however, result gets a value of 1. I was expecting it to be 0. Am I missing something? Why is it 1?
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