hibernate annotation 之 一对多、多对一双向外键关联

3 import java.io.Serializable;
4 import java.util.Set;
5 import javax.persistence.CascadeType;
6 import javax.persistence.Column;
7 import javax.persistence.Entity;
8 import javax.persistence.FetchType;
9 import javax.persistence.GeneratedValue;
10 import javax.persistence.Id;
11 import javax.persistence.OneToMany;
12 /**
13  * -----------------------------------------
14  * @描述  农场
18  * -----------------------------------------
19  */
20 @Entity
21 public class Farm implements Serializable{
22
23     private static final long serialVersionUID = 1L;
24
25     private Integer id;
26     private String  name;
27     private Set<Plant> plantSet;
28
29     @Id
30     @GeneratedValue
31     public Integer getId() {
32         return id;
33     }
34     @Column(length = 18, nullable = false)
35     public String getName() {
36         return name;
37     }
38     @OneToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY, mappedBy = "farm")
39     public Set<Plant> getPlantSet() {
40         return plantSet;
41     }
42     public void setId(Integer id) {
43         this.id = id;
44     }
45     public void setName(String name) {
46         this.name = name;
47     }
48     public void setPlantSet(Set<Plant> plantSet) {
49         this.plantSet = plantSet;
50     }
51 }

3 import java.io.Serializable;
4 import javax.persistence.CascadeType;
5 import javax.persistence.Column;
6 import javax.persistence.Entity;
7 import javax.persistence.FetchType;
8 import javax.persistence.GeneratedValue;
9 import javax.persistence.Id;
10 import javax.persistence.ManyToOne;
11 /**
12  * -----------------------------------------
13  * @描述  植物
17  * -----------------------------------------
18  */
19 @Entity
20 public class Plant implements Serializable{
21
22     private static final long serialVersionUID = 1L;
23
24     private Integer id;
25     private String   name;
26     private Farm    farm;
27
28     @Id
29     @GeneratedValue
30     public Integer getId() {
31         return id;
32     }
33     @Column(length = 18, nullable = false)
34     public String getName() {
35         return name;
36     }
37     @ManyToOne(cascade = CascadeType.PERSIST, optional = false, fetch = FetchType.LAZY)
38     public Farm getFarm() {
39         return farm;
40     }
41     public void setId(Integer id) {
42         this.id = id;
43     }
44     public void setName(String name) {
45         this.name = name;
46     }
47     public void setFarm(Farm farm) {
48         this.farm = farm;
49     }
50
51 }