休眠-当fk自引用在另一个类中时，句柄添加（插入）

<?xml version=\"1.0\" encoding=\"UTF-8\"?>
<!DOCTYPE hibernate-mapping PUBLIC \"-//Hibernate/Hibernate Mapping DTD 3.0//EN\" \"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd\">
<hibernate-mapping>
  <class name=\"org.example.CPUModel\" table=\"cpu_model\">
    <id name=\"cpuModelId\" type=\"java.lang.Integer\" unsaved-value=\"null\">
      <column name=\"cpu_model_id\"/>
      <generator class=\"identity\"/>
    </id>
    <property name=\"name\" type=\"java.lang.String\">
      <column length=\"32\" name=\"name\"/>
    </property>
    <set name=\"softwares\" inverse=\"true\" lazy=\"false\" table=\"cpu_model_software\" cascade=\"all-delete-orphan\" order-by=\"cpu_sw_id desc\">
      <key>
        <column name=\"cpu_model_id\" not-null=\"true\"/>
      </key>
      <one-to-many class=\"org.example.CPUModelSoftware\"/>
    </set>
  </class>
</hibernate-mapping>

<?xml version=\"1.0\" encoding=\"UTF-8\"?>
<!DOCTYPE hibernate-mapping PUBLIC \"-//Hibernate/Hibernate Mapping DTD 3.0//EN\" \"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd\">
<hibernate-mapping>
  <class name=\"org.example.CPUModelSoftware\" table=\"cpu_model_software\">
    <composite-id name=\"cpuModelSoftwarePK\" class=\"org.example.CPUModelSoftwarePK\">
      <key-property name=\"cpuModelId\" column=\"cpu_model_id\" type=\"java.lang.Integer\"/>
      <key-property name=\"cpuSwId\" column=\"cpu_sw_id\" type=\"java.lang.Integer\"/>
    </composite-id>
    <many-to-one class=\"org.example.CPUSoftware\" insert=\"false\" update=\"false\" fetch=\"select\" name=\"cpuSw\">
      <column name=\"cpu_sw_id\" not-null=\"true\"/>
    </many-to-one>
  </class>
</hibernate-mapping>

DEBUG Could not execute JDBC batch update [insert into exampledb.cpu_model_software (cpu_model_id, cpu_sw_id) values (?, ?)]
java.sql.BatchUpdateException: Column \'cpu_model_id\' cannot be null

+----------------+---------+------+-----+---------+-------+
| Field          | Type    | Null | Key | Default | Extra |
+----------------+---------+------+-----+---------+-------+
| cpu_model_id   | int(11) | NO   | MUL | NULL    |       |
| cpu_sw_id      | int(11) | NO   | MUL | NULL    |       |
+----------------+---------+------+-----+---------+-------+

+----------------+------------------+------+-----+---------+----------------+
| Field          | Type             | Null | Key | Default | Extra          |
+----------------+------------------+------+-----+---------+----------------+
| cpu_model_id   | int(11) unsigned | NO   | PRI | NULL    | auto_increment |
| name           | varchar(32)      | NO   |     |         |                |
+----------------+------------------+------+-----+---------+----------------+

ids for this class must be manually assigned before calling save(): org.example.CPUModelSoftware