原因：hibernate项目中在学生表的配置文件中：
<id name="studentno" column="studentno">
<generator class="native"></generator>
</id>
将主键设置为了自动增长的类型，但是数据库创建表的时候却将数据类型设置成了vchar类型，这怎么实现++操作呢？
将学号（主键）设置为int类型，问题得到了成功解决：
The database returned no natively generated identity value错误解决方案
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