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//设置主键自增

@Id    @Column(name = "RecordId", unique = true, nullable = false)    @GeneratedValue(strategy = GenerationType.AUTO)

//允许主键自动增长

使用hibernateSessionFactory获取session插入数据.

public void insertRecord(VistorRecord v) {        session = HibernateSessionFactory.getSession();        tran = session.beginTransaction();         session.save(v);        tran.commit();        HibernateSessionFactory.closeSession();    }

//获取数据库记录条数

public int getVisitorNum() {        session = HibernateSessionFactory.getSession();        String hql = "select count(*) from VistorRecord v";        long res = (long) (session.createQuery(hql).uniqueResult());        HibernateSessionFactory.closeSession();        return (int)res;    }