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PONHibernate + Many-to-Many + bag + mapping table
 

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  1. PONHibernate + Many-to-Many + bag + mapping table
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    <p>I have following 3 classes. </p> <pre><code>BusinessStream Scheme Bus_Stream_Scheme_Map </code></pre> <p>When I try to execute <code>transaction.Commit()</code> method, after <code>session.SaveOrUpdate()</code> for <code>BusinessStream</code>, I get following error, </p> <p>cannot insert NULL into ("DBO"."BUS_STREAM_SCHEME_MAP"."BUS_STREAM_SCHEME_MAP_ID")</p> <p>HBM Files,</p> <p>BusienssStream</p> <pre><code>&lt;class name="BusinessStream" table="BUS_STREAM"&gt; &lt;id name="Id" column="BS_ID" type="Int32" &gt; &lt;generator class="sequence"&gt; &lt;param name="sequence"&gt;BUS_STREAM_SEQ&lt;/param&gt; &lt;/generator&gt; &lt;/id&gt; &lt;property name="Name" column="Name" type="String"/&gt; &lt;property name="Description" column="Description" type="String"/&gt; &lt;bag name="Schemes" table="BUS_STREAM_SCHEME_MAP" lazy="false"&gt; &lt;key column="BUS_STREAM_ID"&gt;&lt;/key&gt; &lt;many-to-many class="Scheme" column="SCHEME_ID"&gt;&lt;/many-to-many&gt; &lt;/bag&gt; &lt;/class&gt; </code></pre> <p>Scheme</p> <pre><code>&lt;class name="Scheme" table="SCHEME_DEF"&gt; &lt;id name="Id"&gt; &lt;column name="SCHEME_ID"/&gt; &lt;generator class="native"&gt; &lt;param name="sequence"&gt;SCHEME_DEF_SEQ&lt;/param&gt; &lt;/generator&gt; &lt;/id&gt; &lt;property name="Description" column="SCHEME_DESC" type="String"/&gt; &lt;/class&gt; </code></pre> <p>BusinessStream_Scheme_Map</p> <pre><code>&lt;class name="BusinessStreamSchemeMapping" table="BUS_STREAM_SCHEME_MAP"&gt; &lt;id name="Id"&gt; &lt;column name="BUS_STREAM_SCHEME_MAP_ID"/&gt; &lt;generator class="native"&gt; &lt;param name="sequence"&gt;BUS_STREAM_SCHEME_MAP_SEQ&lt;/param&gt; &lt;/generator&gt; &lt;/id&gt; &lt;/class&gt; </code></pre> <p>What am I doing wrong?</p>
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    1. USPak
    1. USPak
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    1. COIt's been while since I worked with NHibernate but I remember that many-to-many relations can be mapped without a mapping entry for the association table. Is it necessary for your business logic and/or other use cases to map `BusinessStreamSchemeMapping`?
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    2. COWe are debating the same and seeing if we can avoid the map class/table. Thanks for your comment.
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      1. USPak
 

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