es映射父子关系java_hibernate实体类映射父子关系

/**

* 任务实体类

*/

@Entity

@Table(name = "t_task")

public class Task implements Serializable {

/**

*

*/

private static final long serialVersionUID = 1L;

private Long id;

private String name;

//计划开始时间

private Date plan_startTime;

private Project project;

//父任务

private Task parent;

// 子任务

private Set children = new HashSet();

@Id

@GeneratedValue(strategy = GenerationType.AUTO)

@Column(name = "id")

public Long getId() {

return id;

}

public void setId(Long id) {

this.id = id;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

@Temporal(TemporalType.TIMESTAMP)

public Date getPlan_startTime() {

return plan_startTime;

}

public void setPlan_startTime(Date plan_startTime) {

this.plan_startTime = plan_startTime;

}

@ManyToOne(optional = false, cascade = {CascadeType.REFRESH, CascadeType.MERGE})

@JoinColumn(name = "projectId")

public Project getProject() {

return project;

}

public void setProject(Project project) {

this.project = project;

}

@ManyToOne(cascade = {CascadeType.REFRESH, CascadeType.MERGE})

@JoinColumn(name = "parentId")

public Task getParent() {

return parent;

}

public void setParent(Task parent) {

this.parent = parent;

}

@OrderBy("id ASC")

@OneToMany(mappedBy = "parent", fetch = FetchType.LAZY, cascade = {CascadeType.ALL})

public Set getChildren() {

return children;

}

public void setChildren(Set children) {

this.children = children;

}

}

posted on 2013-11-07 14:40 杨军威 阅读(346) 评论(0)  编辑  收藏