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PONHibernate one-to-one mapping where second table data can be null
 

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    <p>I have an existing database with the table Transactions in it. I have added a new table called TransactionSequence where each transaction will ultimately have only one record. We are using the sequence table to count transactions for a given account. I have mapped this as a one-to-one mapping where TransactionSequence has a primary key of TransactionId. </p> <p>The constraint is that there is an instead of trigger on the transaction table does not allow updates of cancelled or posted transactions. </p> <p>So, when the sequence is calculated and the transaction is saved, NHibernate tries to send an update on the transaction like 'UPDATE Transaction SET TransactionId = ? WHERE TransactionId = ?'. But this fails because of the trigger. How can I configure my mapping so that NHibernate will not try to update the Transaction table when a new TransactionSequence table is inserted?</p> <p>Transaction mapping:</p> <pre><code>&lt;class name="Transaction" table="Transaction" dynamic-update="true" select-before-update="true"&gt; &lt;id name="Id" column="ID"&gt; &lt;generator class="native" /&gt; &lt;/id&gt; &lt;property name="TransactionTypeId" access="field.camelcase-underscore" /&gt; &lt;property name="TransactionStatusId" column="DebitDebitStatus" access="field.camelcase-underscore" /&gt; &lt;one-to-one name="Sequence" class="TransactionSequence" fetch="join" lazy="false" constrained="false"&gt; &lt;/one-to-one&gt; &lt;/class&gt; </code></pre> <p>And the sequence mapping:</p> <pre><code>&lt;class name="TransactionSequence" table="TransactionSequence" dynamic-update="true"&gt; &lt;id name="TransactionId" column="TransactionID" type="Int32"&gt; &lt;generator class="foreign"&gt; &lt;param name="property"&gt;Transaction&lt;/param&gt; &lt;/generator&gt; &lt;/id&gt; &lt;version name="Version" column="Version" unsaved-value="-1" access="field.camelcase-underscore" /&gt; &lt;property name="SequenceNumber" not-null="true" /&gt; &lt;one-to-one name="Transaction" class="Transaction" constrained="true" foreign-key="fk_Transaction_Sequence" /&gt; &lt;/class&gt; </code></pre> <p>Any help would be greatly appreciated...</p>
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