hibernate注解:@Entity //创建类对象@Table(name="t_dept1")// 类与表的映射，相当于 <class name=".." table="..">public class Dept {         @Id//主键映射         @Column(name="did")//指定映射表的字段id名称         @GeneratedValue(strategy=GenerationType.AUTO)//以native的方式设置主键的值         private Integer did;         @Column(name="dname")         private String dname;@Entity@Table(name = "t_emp1")public class Emp {         @Id         @Column(name = "eid")         @GeneratedValue(strategy = GenerationType.AUTO)         private Integer eid;         @Column(name = "ename")         private String ename;         @ManyToOne     //多对一         @JoinColumn(name="iiiid")         private Dept dept;