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POHow can I insert SQL 2008 parent and child rows in a single transaction using VB.NET?
 

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  1. POHow can I insert SQL 2008 parent and child rows in a single transaction using VB.NET?
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    <p>First, a little background (greatly simplified): I have two classes, one called <em>Entity</em> and one called <em>Item</em> which a subclass of Entity. They each store their individual properties in seperate SQL 2008 tables using TableAdapters generated by a strongly typed DataSet. The Entity class has a Save() method that looks like this:</p> <pre><code>Public Sub Save() entityTableAdapter.Update(entityRow) End Sub </code></pre> <p>and the Item class has a Save method which looks like this:</p> <pre><code>Public Overrides Sub Save() MyBase.Save itemTableAdapter.Update(itemRow) End Sub </code></pre> <p>This works well except that if inserting an Item row fails then I am left with an orphaned Entity row in the database so I extended the TableAdapters and Save methods to use a transaction like so:</p> <p>Entity Save method:</p> <pre><code>Public Sub Save(tx as SqlTransaction) entityTableAdapter.Connection = tx.Connection entityTableAdapter.Transaction = tx entityTableAdapter.Update(entityRow) End Sub </code></pre> <p>Item Save method:</p> <pre><code>Public Overrides Sub Save() // setup the transaction: dim cn as SqlConnection = itemTableAdapter.Connection cn.Open dim tx as Sql Transaction = cn.BeginTransaction // save the base object properties: MyBase.Save(tx) // save this object's properties: itemTableAdapter.Connection = cn itemTableAdapter.Transaction = tx itemTableAdapter.Update(itemRow) // commit the transaction tx.Commit End Sub </code></pre> <p>Now when I attempt to save a new Item everything works up to the itemTableAdapter.Update(itemRow) where I get an error similar to </p> <blockquote> <p>INSERT statement conflicted with the FOREIGN KEY constraint... column 'EntityID'</p> </blockquote> <p>Indeed, the SQL table does not contain a row in the Entity table with the necessary ID at this point because the transaction is not complete. </p> <p>Am I going about this the wrong way? My goal is to prevent the Entity record from being inserted if inserting the Item record fails. I could write code to delete the Entity record again, but this does not seem very elegant to me...</p> <p>The code above has been greatly simplified to illustrate the problem. I am happy to post more details if it helps.</p> <p>Thanks in advance for any help!</p> <p>JE</p>
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