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POExecuteNonQuery in parallel within a shared OleDbConnection / OleDbTransaction
 

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    <p>Discovered that OleDBConnection doesn't seem to be ThreadSafe. It appears that it attempts to open multiple connections instead.</p> <pre><code>//doesn't work using (OleDbConnection oConn = TheDataAccessLayer.GetConnection()) using (OleDbTransaction oTran = oConn.BeginTransaction()) Parallel.ForEach(ORMObjects, (ORMObject, State) =&gt; { if (!State.ShouldExitCurrentIteration &amp;&amp; !State.IsExceptional) { var Error = ORMObject.SomethingThatExecutesANonQuery(oConn,oTran) if (Error.Number != 0) State.Stop(); } }); </code></pre> <p>If I lock the connection for an ExecuteNonQuery the errors go away, but the performance tanks.</p> <pre><code> //works using (OleDbConnection oConn = TheDataAccessLayer.GetConnection()) using (OleDbTransaction oTran = oConn.BeginTransaction()) Parallel.ForEach(ORMObjects, (ORMObject, State) =&gt; { if (!State.ShouldExitCurrentIteration &amp;&amp; !State.IsExceptional) { lock(oConn) { var Error = ORMObject.SomethingThatExecutesANonQuery(oConn,oTran) if (Error.Number != 0) State.Stop(); } } }); </code></pre> <p>Assume that </p> <ul> <li><p>I can't change the nature of the ORM: the SQL cannot be bulked</p></li> <li><p>Business rules require that the interaction be performed within a single transaction</p></li> </ul> <p>So:</p> <ul> <li><p>Is there a more better/more efficient way to parallelize OleDb interactions?</p></li> <li><p>If not, is there an alternative to the OleDb client that can take full advantage of parallelism? (Maybe the native MSSQL client?)</p></li> </ul>
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