Cannot use identity columnkey generation
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错误：exception is org.hibernate.MappingException: Cannot use identity columnkey generation with <union-subclass> mapping for:subclass.model.UserhistoryDO
（使用unnion-subclass元素时，父类标识属性生成器用 native 报错）
解决方法：在MySql数据库中，父类标识属性生成器hilo。 说明：native是自动去找生成主键的依据，在Oracle中是去找sequence，然后sequence直接用Hibernate_sequence产生oid，不需要进行高低位运算 而在DB2和MySQL等数据库中是去找identity，可能是在找的时候没有找到identity吧
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