JPA实体映射,它基于另外两个实体映射关联

Question

不确定这是否可行,但尝试WorkflowInstancePlayer player 根据两个其他实体映射WorkActionClass以及WorkflowInstance下面的实体映射哪些相关.

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是基于workflow_instance_id并且role_class_id实际上role_class_id是workActionClass上面映射的属性而派生的(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;

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;

示例数据将是:

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

因此,在Action Entity中,我将知道工作流实例播放器是具有Id 111222的Employee而没有实际将徽章存储在Action表中.

UPDATE

根据弗拉德的帖子,我调整了它

@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

尝试使用此映射:

@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;