[英]How do I properly cascade save a one-to-one, bidirectional relationship on primary key in Hibernate 3.6
[英]Foreign Key constraint violation with bidirectional one-to-one relationship with shared primary key
我試圖用JPA創建兩個類之間的一對一關聯,一個類是父類,另一個是子類,並使用生成器來確保它們具有相同的主鍵:
@Entity
public class TestFKParent {
@Column(name="code", nullable=false)
@Id
private String code;
@OneToOne(mappedBy="parent", targetEntity=TestFKChild.class, optional=false)
@org.hibernate.annotations.Cascade({CascadeType.ALL})
@PrimaryKeyJoinColumn
private TestFKChild child;
// getters and setters
}
和
@Entity
public class TestFKChild {
@Column(name="id", nullable=false)
@Id
@GeneratedValue(generator="MyGen")
@org.hibernate.annotations.GenericGenerator(name="MyGen",
strategy="foreign",parameters = @Parameter(name = "property", value = "parent"))
private String ID;
@OneToOne(targetEntity=TestFKParent.class, optional=false)
@org.hibernate.annotations.Cascade({})
@PrimaryKeyJoinColumn
private TestFKParent parent;
// getters and setters
}
我使用以下代碼持久化對象:
public void testMerge() throws Exception
{
TestFKParent parent = new TestFKParent();
parent.setCode("foo");
TestFKChild child = new TestFKChild();
parent.setChild(child);
child.setParent(parent);
em.merge(parent);
}
但不幸的是,我收到了外鍵沖突:
com.sybase.jdbc3.jdbc.SybSQLException: Foreign key constraint violation occurred, dbname = 'MYDB', table name = 'TestFKChild', constraint name = 'FKE39B2A659CF5145B'
查看日志,似乎它首先嘗試保留子項,但這是在此TestFKChild表中,我在TestFKParent父項上具有外鍵。
在JPA / Hibernate中描述這種關系的正確方法是什么?
您已經提到您正在嘗試在父母與孩子之間建立一對一的關系。
在這里,我想知道why are you keeping Parent class as a memeber variable in Child class?
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