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当我为第一个实体（customer1）创建数据时，数据已成功创建，但是当我想为第二个实体创建数据时，出现以下错误。我们在两个具有不同表注释名称的不同包中生成这两个实体，所以我不明白为什么我会收到此错误。我们还为每个实体创建不同的持久性单元名称......这个错误的原因可能是什么？

错误在提交中

entityManager.getTransaction().commit();
        entityManager.close();

异常 [EclipseLink-4002] (Eclipse Persistence Services - 2.3.2.v20111125-r10461): org.eclipse.persistence.exceptions.DatabaseException 内部异常: java.sql.SQLIntegrityConstraintViolationException: 该语句被中止，因为它会导致重复键在“customer02”上定义的“SQL130407132754180”标识的唯一或主键约束或唯一索引中的值。错误代码：20000 调用：INSERT INTO customer02(CUSTOMER, NOTE, BUYERID) VALUES (?, ?, ?) bind => [3 个参数绑定] 查询：InsertObjectQuery(prod2.customer02@7fe4bdcc)

实体 1 客户在包中 ... customer01

package prod1;

import java.util.List;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name="customer01")
public class Customer
{

  @Id
  @Column(name="customer_number")
  private String customer;
  private String Note;
  private String BuyerId;

实体 2 客户在包中 ... customer02

package prod2;

import java.util.List;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name="customer02")
public class Customer
{

  @Id
  @Column(name="customer_number")
  private String customer;
  private String Note;
  private String BuyerId;

持久性单位是

-<persistence-unit name="prod1">
<class>prod1.customer01</class>-
<properties><property name="eclipselink.ddl-generation" 
value="drop-and-create-tables"/>
<property name="eclipselink.logging.level" value="SEVERE"/>
</properties></persistence-unit>-

-<persistence-unit name="prod2">
<class>prod2.customer02</class>-
<properties><property name="eclipselink.ddl-generation" 
value="drop-and-create-tables"/>
<property name="eclipselink.logging.level" value="SEVERE"/>
</properties></persistence-unit>-
4

1 回答 1

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显示的注释没有为 ID 定义排序。尝试添加 @GeneratedValue 让提供商为您分配它们。

http://wiki.eclipse.org/EclipseLink/Examples/JPA/PrimaryKey

于 2013-04-07T13:25:37.533 回答