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<p style="margin: 10px 0 0 0">The mapping file:</p>
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<pre class="code-java" style="margin: 10px 0 0 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
<hibernate-mapping <span class="code-keyword" style="color: #000091">package</span>=<span class="code-quote" style="color: #009100">"org.hibernate.test.collection.set"</span>>
<class name=<span class="code-quote" style="color: #009100">"PersonInfoEntity"</span> table=<span class="code-quote" style="color: #009100">"PersonInfo"</span>>
<id name=<span class="code-quote" style="color: #009100">"id"</span> column=<span class="code-quote" style="color: #009100">"ID"</span> type=<span class="code-quote" style="color: #009100">"<span class="code-object" style="color: #910091; color: #009100">long</span>"</span> />
<set name=<span class="code-quote" style="color: #009100">"Infos"</span>>
<key column=<span class="code-quote" style="color: #009100">"entity_id"</span> />
<element type=<span class="code-quote" style="color: #009100">"org.hibernate.test.collection.set.PersonInfoType"</span> >
<column name=<span class="code-quote" style="color: #009100">"height"</span>/>
<column name=<span class="code-quote" style="color: #009100">"hair_color"</span>/>
</element>
</set>
</class>
</hibernate-mapping>
</pre>
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<p style="margin: 10px 0 0 0">Hibernate generates a table PersonInfo_Infos for the Set. This table doesn't explicitly set a primary key. Here is the table created by Hibernate:</p>
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<pre class="code-java" style="margin: 10px 0 0 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
create table PersonInfo_Infos (
entity_id bigint not <span class="code-keyword" style="color: #000091">null</span>,
height integer,
hair_color varchar(255)
)
</pre>
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<p style="margin: 10px 0 0 0">Hibernate adds all three columns (entity_id, height, hair_color) to the primary columns and Hibernate assume the primary column doesn't have any null value. That's why the delete statement is in the format "column=?" not "column is null".</p>
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