在POJO的映射文件中配置如下:
<hibernate-mapping package="com.lpc.hibernate"> <class name="User" table="user"> <id name="id"> <generator class="identity"> </generator> </id> <property name="name" column="name"></property> <property name="password" column="password"></property> </class> </hibernate-mapping>
在指定主键生成策略的时候、配置了<generator class="identity"/> 、这是提供自动增长、为数据表中的主键自动增长、但是如果数据库没有定义id列为自动增长的话、就会出现The database returned no natively generated identity value错误、所以要在数据库中手动定义id列自动增长
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