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POnHibernate Cascade AllDeleteOrphan: Why is NH deleting each collection item individually
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  1. POnHibernate Cascade AllDeleteOrphan: Why is NH deleting each collection item individually
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    copied!<p>When I'm clearing a childcollection like this</p> <pre><code>table.Indizes.Clear(); session.Flush(); </code></pre> <p>then NH generates a delete SQL for each item which was in the collection:</p> <p>DELETE FROM x_inddef WHERE ind_name = 'IDX_ADRKONZ_CODE' AND tbl_name = 'ADRESSE' DELETE FROM x_inddef WHERE ind_name = 'IDX_ADRKUND_EXT' AND tbl_name = 'ADRESSE' </p> <p>...</p> <p>Why isn't it generating a statement like this?</p> <pre><code>DELETE FROM x_inddef WHERE tbl_name = 'ADRESSE' </code></pre> <p>Is something wrong with my mappings, or is this just the normal behaviour?</p> <p>Simplified Code with the fluent Mapping:</p> <pre><code>public class Table { public virtual string Name {get;set; public virtual IList&lt;Index&gt; Indizes { get; set; } } public class TableOverride : IAutoMappingOverride&lt;Table&gt; { public void Override(AutoMapping&lt;Table&gt; mapping) { mapping.Table("x_tables"); mapping.Id(x =&gt; x.Name, "tbl_name"); mapping.HasMany(x =&gt; x.Indizes).KeyColumn("tbl_name").Inverse().Cascade.AllDeleteOrphan(); } } public class Index { public virtual string Name { get; set; } public virtual Table Table { get; set; } public override bool Equals(object obj) { //... } public override int GetHashCode() { //... } } public class IndexOverride : IAutoMappingOverride&lt;Index&gt; { public void Override(AutoMapping&lt;Index&gt; mapping) { mapping.Table("x_inddef"); mapping.CompositeId(). KeyProperty(x =&gt; x.Name, "ind_name"). KeyReference(x =&gt; x.Table, "tbl_name"); } } </code></pre>
 

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