合并多对多实体会在连接表中引发重复条目

Question

我们有两个实体

@XmlRootElement
@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "")
@Entity
@Table(name = "distributionlists", schema = "")
public class DistributionList implements Serializable
{
....
 @ManyToMany(targetEntity = Contact.class)
@JoinTable(
        name = "distributionlists_contacts",
        joinColumns = @JoinColumn(name = "dl_id", referencedColumnName = "dl_id"),
        inverseJoinColumns = @JoinColumn(name = "con_id", referencedColumnName = "con_id"))
private List<Contact> contacts;
}

和第二个实体

 @XmlRootElement
 @XmlType(name = "")
 @Entity
 @Table(name = "contacts", schema = "")
public class Contact implements Serializable
{
 ....

@ManyToMany(targetEntity = DistributionList.class, mappedBy = "contacts")
private List<DistributionList> distributionLists;
}

当我们做的时候 em.merge(分布列表);

eclipse link 尝试在 jointable

中复制条目

Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.6.3.qualifier): org.eclipse.persistence.exceptions.DatabaseException
Internal Exception: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Duplicate entry '1-1' for key 'PRIMARY'
Error Code: 1062
Call: INSERT INTO distributionlists_contacts (con_id, dl_id) VALUES (?, ?)
bind => [2 parameters bound]
Query: DataModifyQuery(name="contacts" sql="INSERT INTO distributionlists_contacts (con_id, dl_id) VALUES (?, ?)")
.....

有什么建议吗？ entity应该是正确的，我们合并owner部分

Answer 1

可能是您的 List-s 包含重复项。尝试将集合类型从列表更改为集合。

合并多对多实体会在连接表中引发重复条目

merge on a manyto many entity provoke a duplicate entry in jointable

java

eclipselink

persistence