s2sh中关于使用hibernate添加用户的情况
我有三张表，一张表示用户表，属性为username（主键，varchar型）和password（varchar）；第二张表为blackhole主键为blackholeid（int型），username（外键），blackholecontent（varchar），datetime（datetime）；还有一张joke表和blackhole差不多。我的dao层继承了HibernateDaoSupport并使用了getHibernateTemplate().save(user)，结果报了如下错误：
Hibernate operation: could not insert: [com.model.User]; uncategorized SQLException for SQL [insert into blackhole.user (password) values (?)]; SQL state [HY000]; error code [1364]; Field 'username' doesn't have a default value; nested exception is java.sql.SQLException: Field 'username' doesn't have a default value
org.springframework.jdbc.UncategorizedSQLException: Hibernate operation: could not insert: [com.model.User]; uncategorized SQLException for SQL [insert into blackhole.user (password) values (?)]; SQL state [HY000]; error code [1364]; Field 'username' doesn't have a default value; nested exception is java.sql.SQLException: Field 'username' doesn't have a default value
java.sql.SQLException: Field 'username' doesn't have a default value
[解决办法]
删除user.hbm.xml中username配置的 <generator class="native" />
[解决办法]
