JPA Varlık Eşlemesi, diğer iki nesne eşlemesine göre ilişkili

Question

Bunun mümkün olup olmadığından emin olun, ancak WorkflowInstancePlayer player eşlemini, ilgili diğer iki eşleme eşleştirmesi, WorkActionClass ve WorkflowInstance temel alınarak aşağıdaki eşlemede eşleştirmeye çalışın.

public class Action implements Serializable { 
@Id 
private Long action_id; 

@ManyToOne 
@JoinColumn(name = "work_action_class_id", referencedColumnName = "work_action_class_id") 
private WorkActionClass workActionClass; 

@ManyToOne 
@JoinColumn(name = "workflow_instance_id", referencedColumnName = "workflow_instance_id") 
private WorkflowInstance workflowInstance; 

UPDATE: How can I map to a WorkflowInstancePlayer player????? 
@ManyToOne 
@JoinColumns({ 
     @JoinColumn(name = "workflow_instance_id", referencedColumnName = "workflow_instance_id", insertable = false, updatable = false), 
     @JoinColumn(name = "workActionClass.role_class_id", referencedColumnName = "role_class_id", insertable = false, updatable = false) 
}) 
private WorkflowInstancePlayer player; 

workflowInstancePlayer workflow_instance_id ve role_class_id ancak role_class_id göre türetilir (workActionClass.role_class_id)

public class WorkflowInstancePlayer implements Serializable { 
@Id 
private WorkflowInstance workflowInstance; 

@Id 
private RoleClass roleClass; 

@ManyToOne 
@JoinColumn(name = "badge", referencedColumnName = "badge") 
private Employee employee; 

üzerinde eşlenen workActionClass bir attibute gerçekten

public class WorkActionClass implements Serializable { 
@Id 
@GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "trx_seq") 
private Long work_action_class_id; 

@ManyToOne 
@JoinColumn(name = "role_class_id") 
private RoleClass roleClass; 

Örnek verileri olacaktır:

Action 
------ 
Id = 10 
work_action_class_id = 7 
workflow_instance_id = 2 


WorkActionClass 
--------------- 
Id = 7 
role_name = reviewer 
role_class_id = 3 


WorkflowInstancePlayer 
---------------------- 
workflow_instance_id = 2 
role_class_id = 3 
badge = 111222 

Yani Eylem Varlık içinde, ben İş Akışı Örneği Oyuncu aslında Eylem tablosunda rozeti kaydetmeden Id 111222 ile Çalışan olduğunu bileceksiniz.

GÜNCELLEME

Ben tweaked Vlad yazı dayanarak bu

@ManyToOne(fetch=FetchType.LAZY) 
    @JoinColumnsOrFormulas({ 
    @JoinColumnOrFormula(formula=@JoinFormula(value="(SELECT a.role_class_id FROM (Use Table Name not Entity Name here) a WHERE a.work_action_class_id = work_action_class_id)", referencedColumnName="role_class_id")), 
    @JoinColumnOrFormula(column = @JoinColumn(name="workflow_instance_id", referencedColumnName="workflow_instance_id")) 
}) 

Answer 1

bu haritalama ile deneyin olmak:

@ManyToOne 
@JoinColumn(
    name = "workflow_instance_id", 
    referencedColumnName = "workflow_instance_id", 
    insertable = false, 
    updatable = false 
) 
private WorkflowInstance workflowInstance; 

@ManyToOne 
@JoinColumnOrFormula(
    formula = @JoinFormula(
      value="(SELECT a.work_action_class_id FROM WorkActionClass a WHERE a.role_class_id = role_class_id)", 
     referencedColumnName = "work_action_class_id" 
    ) 
) 
private WorkActionClass workActionClass; 

@ManyToOne 
@JoinColumns({ 
    @JoinColumn(
     name = "workflow_instance_id", 
     referencedColumnName = "workflow_instance_id"), 
    @JoinColumn(
     name = "role_class_id", 
     referencedColumnName = "role_class_id") 
}) 
private WorkflowInstancePlayer player;