在使用该注解时：@GeneratedValue要注意的几点：
@GeneratedValue注解的strategy属性提供四种值:
-AUTO主键由程序控制, 是默认选项 ,不设置就是这个
-IDENTITY 主键由数据库生成, 采用数据库自增长, Oracle不支持这种方式
-SEQUENCE 通过数据库的序列产生主键, MYSQL 不支持
-Table 提供特定的数据库产生主键, 该方式更有利于数据库的移植
所以在实体类中使用该注解时：一定要注意指定生成的策略：否则报该错误
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