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POCan you include linq-to-sql changes and ADO.NET dataset table adapter updates in a single transaction?
 

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  1. POCan you include linq-to-sql changes and ADO.NET dataset table adapter updates in a single transaction?
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    <p>Here are the relevant technologies that I'm working with:</p> <ul> <li>Devart's dot Connect for Oracle (to facilitate Linq-to-Sql for Oracle).</li> <li>Strongly Typed ADO.NET Datasets.</li> <li>An Oracle database.</li> </ul> <p>Here's the challenge:</p> <ul> <li>My legacy code submits database updates with ADO.NET datasets and table adapters.</li> <li>I'd like to begin converting that code over to Linq-to-Sql, but I'd like to do it piecemeal to minimize code churn and risk.</li> </ul> <hr> <p>Here's my proof of concept schema:</p> <p>Parent Table</p> <ul> <li>Parent.Id</li> <li>Parent.Name</li> </ul> <p>Child Table</p> <ul> <li>Child.Id</li> <li>Child.ParentId</li> <li>Child.Name</li> </ul> <p>Here's my proof of concept code block:</p> <pre><code>using System; using System.Data.Common; using DevArtTry1.DataSet1TableAdapters; namespace DevArtTry1 { class Program { static void Main(string[] args) { using (DataContext1 dc = new DataContext1()) { dc.Connection.Open(); using (DbTransaction transaction = dc.Connection.BeginTransaction(System.Data.IsolationLevel.ReadCommitted)) { dc.Transaction = transaction; Parent parent = new Parent(); parent.Id = 1; parent.Name = "Parent 1"; dc.Parents.InsertOnSubmit(parent); dc.SubmitChanges(); // By virtue of the Parent.Id -&gt; Child.ParentId (M:N) foreign key, this statement will impose a write lock on the child table. DataSet1.CHILDDataTable dt = new DataSet1.CHILDDataTable(); DataSet1.CHILDRow row = dt.NewCHILDRow(); row.ID = 1; row.PARENTID = 1; row.NAME = "Child 1"; dt.AddCHILDRow(row); CHILDTableAdapter cta = new CHILDTableAdapter(); // cta.Transaction = transaction; Not allowed because you can't convert source type 'System.Data.Common.DbTransaction to target type 'System.Data.OracleClient.OracleTransaction. cta.Update(dt); // The thread will encounter a deadlock here, waiting for a write lock on the Child table. transaction.Commit(); } } Console.WriteLine("Successfully inserted parent and child rows."); Console.ReadLine(); } } } </code></pre> <hr> <ul> <li>As the comments above indicate, the thread will halt indefinitely on the child data adapter's update call because it will wait indefinitely for a write lock on the Child table. [Note the foreign key relationship: Parent.Id -> Child.ParentId (M:N)]</li> </ul> <p>Here's my question:</p> <ul> <li>I want to wrap the entire code block in a transaction.</li> <li>Can I do this? Considering that: <ul> <li>I want to commit an update on the Parent table with Linq-to-Sql's <strong>SubmitChanges method</strong>...</li> <li>And I want to commit an update on the Child table with an ADO.NET dataset <strong>table adapter</strong>.</li> </ul></li> </ul> <hr> <p>Here are two interesting footnotes:</p> <ol> <li>This whole things <em>works</em> in reverse. That is, if I wanted to submit changes to the parent table with a data adapter and changes to the child table with linq-to-sql... that <em>would work</em>.</li> <li><p>I tried to explicitly attach the transaction to the dataadapter, but the compiler won't allow it because it is a different type of transaction.</p> <pre><code> CHILDTableAdapter cta = new CHILDTableAdapter(); cta.Transaction = transaction; // Not allowed because you can't convert source type 'System.Data.Common.DbTransaction' to target type 'System.Data.OracleClient.OracleTransaction'. cta.Update(dt); transaction.Commit(); </code></pre></li> </ol>
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