Hibernate Annotation

@Entity                         -- 声明为一个实体bean    
@Table(name="promotion_info")   --为实体bean映射指定表(表名="promotion_info)    
@Id                             --声明了该实体 bean的标识属性    
@GeneratedValue                 -- 可以定义标识字段的生成策略.    
@Transient                      -- 将忽略这些字段和属性,不用持久化到数据库    
@Column(name="promotion_remark")-- 声明列(字段名="promotion_total") 属性还包括(length=200等)    
@Temporal(TemporalType.TIMESTAMP)--声明时间格式    
@Enumerated                     -- 声明枚举    
@Version                        -- 声明添加对乐观锁定的支持    
@OneToOne                       -- 可以建立实体bean之间的一对一的关联    
@OneToMany                      --可以建立实体 bean之间的一对多的关联    
@ManyToOne                      -- 可以建立实体bean之间的多对一的关联    
@ManyToMany                     --可以建立实体 bean之间的多对多的关联    
@Formula                        -- 一个SQL表达式，这种属性是只读的,不在数据库生成属性(可以使用sum、average、max等)    
@OrderBy                        --Many端某个字段排序(List)                        
@Embedded 

@Entity    
@Table(name="promotion_info")    
public class Promotion implements Serializable {    
    
    //AUTO--可以是identity类型的字段,或者sequence类型或者table类型,取决于不同的底层数据库    
    @Id     
    @GeneratedValue(strategy = GenerationType.AUTO)    
    //对于oracle想使用各自的Sequence:    
    //@GeneratedValue(strategy = GenerationType.AUTO,generator="PROMOTION_SEQ")    
    //@SequenceGenerator(name="PROMOTION_SEQ",sequenceName="PROMOTION_SEQ")    
    private Long id;    
    
    @Column(name="group_start_amount")    
    private Integer groupStartAmount=0;    
        
    @Column(name="promotion_remark",length=200)    
    //@Lob 如果是文章内容可以使用 只需要把length=200去掉就可以了    
    private String remark;    
    //DATE      - java.sql.Date    
    //TIME      - java.sql.Time    
    //TIMESTAMP - java.sql.Timestamp    
    @Temporal(TemporalType.TIMESTAMP)    
    @Column(name="start_time")    
    private Date startTime;    
    
    //显示0 隐藏1    
    public static enum DisplayType {    
        显示,隐藏    
    }    
    @Enumerated(value = EnumType.ORDINAL)//ORDINAL序数    
    private DisplayType displayType = DisplayType. 显示;    
    
    @Version    
    private Integer version;    
    
    //CascadeType.PERSIST   -- 触发级联创建(create)    
    //CascadeType.MERGE     -- 触发级联合并(update)    
    //FetchType.LAZY        -- 延迟加载    
    @ManyToOne(cascade = {CascadeType.PERSIST,CascadeType.MERGE},fetch = FetchType.LAZY)    
    private PromotionGroup promotionGroup;    
    
    //单向ManyToMany    
    //@JoinTable(关联的表名)    
    //joinColumns -- promotion关联的列的外键    
    //inverseJoinColumns -- largess 关联列的外键    
    @ManyToMany(cascade = {CascadeType.PERSIST,CascadeType.MERGE})    
    @JoinTable(name="promotion_largess",joinColumns={@JoinColumn(name="promotion_id")},inverseJoinColumns={@JoinColumn(name="largess_id")})    
    private Set<Largess> largess;     
        
    @OneToMany(mappedBy="promotion",cascade = CascadeType.ALL)    
    @OrderBy("quantity asc")//item中的列表会根据quantity排序    
    private List<PromotionItem> promotionItem;    
    
    //get set 省略....    
    @Transient    
    private Long hashcodeValue = null;    
    public synchronized int hashCode() {    
        if(hashcodeValue = null) {    
            if(id == null)    
                hashcodeValue = new Long(super.hashCode());    
            else    
                hashcodeValue = id;    
        }    
        return hashcodeValue.intValue();    
    }    
    
    public boolean equals(Object obj) {    
        Promotion other = (Promotion) obj;    
        if(this == other)    
            return true;    
        if(this.id == null || other.id == null)    
            return false;    
        return this.id.equals(other.id);    
    }    
    
}    
@Entity    
@Table(name="promotion_group")    
public class PromotionGroup implements Serializable {    
    @Id     
    @GeneratedValue(strategy = GenerationType.AUTO)    
    private Long id;    
        
    //mappedBy的值"promotionGroup"指向owner(Promotion)端的关联属性,并且是双向关系    
    @OneToMany(mappedBy="promotionGroup",cascade=CascadeType.ALL)    
    private List<Promotion> promotion;    
    
    //get set 省略....    
}    
@Entity    
@Table(name="largess")    
public class Largess implements Serializable {    
    @Id     
    @GeneratedValue(strategy = GenerationType.AUTO)    
    private Long id;    
    
    //1.sql语句中的字段和表名都应该和数据库相应,而不是类中的字段,    
    //若带有参数如la.id= id,这个=id才是类中属性    
    //2.操作字段一定要用别名    
    @Formula(select max(la.id) from largess as la)    
    private int maxId;    
    
    @Formula(select COUNT(la.id) from largess la)    
    private int count;    
    
    @Transient    
    private String img    
    
    //get set 省略....    
}    
   

@SuppressWarnings("serial")  
  
@Entity  
  
@Table(name = "Personal")  
  
@SequenceGenerator(name = "PERSONAL_SEQ", sequenceName =   
"PERSONAL_SEQ")  
  
public class Personal implements Serializable {  
  
    private int id;  
  
    private String name;  
  
      
  
    @Embedded  
  
    @AttributeOverrides({  
  
          
@AttributeOverride(name="street",column=@Column(name="home_street")),  
  
        @AttributeOverride(name="city",column=@Column(name="home_city")),  
  
          
@AttributeOverride(name="province",column=@Column(name="home_province")),  
  
          
@AttributeOverride(name="zipcode",column=@Column(name="home_zipcode"))  
  
    })  
  
    private Address homeAddress;  
  
      
  
    @Embedded  
  
    @AttributeOverrides({  
  
          
@AttributeOverride(name="street",column=@Column(name="com_street")),  
  
        @AttributeOverride(name="city",column=@Column(name="com_city")),  
  
          
@AttributeOverride(name="province",column=@Column(name="com_province")),  
  
          
@AttributeOverride(name="zipcode",column=@Column(name="com_zipcode"))  
  
    })  
  
    private Address comAddress;  
  
  
  
    public Personal(){}  
  
      
  
    public Personal(String name,Address homeAddress,Address   
comAddress){  
  
        this.name = name;  
  
        this.homeAddress = homeAddress;  
  
        this.comAddress = comAddress;  
  
    }  
  
  
  
    public Address getComAddress() {  
  
        return comAddress;  
  
    }  
  
  
  
    public void setComAddress(Address comAddress) {  
  
        this.comAddress = comAddress;  
  
    }  
  
  
  
    public Address getHomeAddress() {  
  
        return homeAddress;  
  
    }  
  
  
  
    public void setHomeAddress(Address homeAddress) {  
  
        this.homeAddress = homeAddress;  
  
    }  
  
      
  
    @Id  
  
    @GeneratedValue(generator="PERSONAL_SEQ")  
  
    public int getId() {  
  
        return id;  
  
    }  
  
  
  
    @SuppressWarnings("unused")  
  
    private void setId(int id) {  
  
        this.id = id;  
  
    }  
  
  
  
    public String getName() {  
  
        return name;  
  
    }  
  
  
  
    public void setName(String name) {  
  
        this.name = name;  
  
    }  
  
}  

@SuppressWarnings("serial")  
  
@Embeddable  
  
public class Address implements Serializable {  
  
 private String street;  
  
 private String city;  
  
 private String province;  
  
 private String zipcode;  
  
   
  
 public Address() {  
  
  // TODO Auto-generated constructor stub  
  
 }  
  
 public Address(String street,String city,String province,String   
zipcode){  
  
  this.street = street;  
  
  this.city = city;  
  
  this.province = province;  
  
  this.zipcode = zipcode;  
  
 }  
  
   
  
 @Column(name="city",insertable=false, updatable=false)  
  
 public String getCity() {  
  
  return city;  
  
 }  
  
 public void setCity(String city) {  
  
  this.city = city;  
  
 }  
  
   
  
 @Column(name="province",insertable=false, updatable=false)  
  
 public String getProvince() {  
  
  return province;  
  
 }  
  
 public void setProvince(String province) {  
  
  this.province = province;  
  
 }  
  
 @Column(name="street",insertable=false, updatable=false)  
  
 public String getStreet() {  
  
  return street;  
  
 }  
  
 public void setStreet(String street) {  
  
  this.street = street;  
  
 }  
  
 @Column(name="zipcode",insertable=false, updatable=false)  
  
 public String getZipcode() {  
  
  return zipcode;  
  
 }  
  
 public void setZipcode(String zipcode) {  
  
  this.zipcode = zipcode;  
  
 }  
  
}