什么是“org.hibernate.DuplicateMappingException”错误的意思？ [英] What does "org.hibernate.DuplicateMappingException" error mean?

问题描述

我试图强制JPA / Hibernate生成和使用只有小写的表名。我已经实现了一个像这样的NamingStrategy：

I'm trying to force JPA/Hibernate to generate and use only lowercase tablenames. I've implemented a NamingStrategy like this:

public class MyNamingStrategy extends DefaultNamingStrategy {

  @Override
  public String classToTableName(String className) {
    return super.classToTableName(className).toLowerCase();
  }
}

我通过将此属性设置为持久性来应用它。 xml：

I have applied it by setting this property in persistence.xml:

<property name="hibernate.ejb.naming_strategy" value="entities.strategy.MyNamingStrategy"/>

当我这样做时，我得到了这个堆栈跟踪：

When I do this I get this stacktrace:

SEVERE: Exception while invoking class org.glassfish.persistence.jpa.JPADeployer prepare method
org.hibernate.DuplicateMappingException: Same physical table name [planning] references several logical table names: [Planning], [OrderProductMan_Planning]
        at org.hibernate.cfg.Configuration$MappingsImpl.addTableBinding(Configuration.java:2629)
        at org.hibernate.cfg.annotations.TableBinder.buildAndFillTable(TableBinder.java:254)
        at org.hibernate.cfg.annotations.TableBinder.bind(TableBinder.java:177)

什么是
$ b

What does the

相同的物理表名称[planning]会引用多个逻辑表名称：[Planning]，[ OrderProductMan_Planning]

Same physical table name [planning] references several logical table names: [Planning], [OrderProductMan_Planning]

是什么意思？

来自错误的实体，尽可能简化尽我所能。

Entities from the error, simplified as much as I could. Let me know if you need the rest.

@Entity
public class Planning implements Serializable {

  @Id
  @GeneratedValue(strategy = GenerationType.AUTO)
  private Integer id;

  private Integer qty;

  @ManyToOne
  private OrderProductMan orderProduct;

  ....
}


@Entity
@Table
public class OrderProductMan implements Serializable {

  @Id
  @GeneratedValue(strategy = GenerationType.IDENTITY)
  @Basic(optional = false)
  private Integer opId;

  @Basic(optional = false)
  private int qty;

  @ManyToOne(optional = false)
  private ProductMan produse;

  @ManyToOne(optional = false)
  private OrderMan orders;

  @Transient
  private int totalScheduled;

  @Transient
  private int totalProduced;
   // ...
 }

推荐答案

Bogdan，谢谢你发布这个。我在Linux上使用Hibernate / JPA / MySQL的Unix / Windows可移植性的大小写敏感的表名类似的问题。

Bogdan, thanks for posting this. I had a similar problem with case-sensitive table names for Unix/Windows portability using Hibernate/JPA/MySQL on Linux.

像你一样，我开始绑定我的表通过在我的META-INF / persistence.xml文件中配置自定义的NamingStrategy，名称全部小写：

Like you, I set out to bind my table names as all lower-case by configuring a custom NamingStrategy in my META-INF/persistence.xml file:

<property name="hibernate.ejb.naming_strategy" value="my.package.LowerCaseNamingStrategy" />

我得到了相同的异常：org.hibernate.DuplicateMappingException：相同的物理表名...通过使用调试器，我有一个顿悟，也许我没有使用DefaultNamingStrategy开始！所以我将我的基类更改为org.hibernate.cfg.EJB3NamingStrategy 。在使用JPA批注时，这是比较合适的，我相信！这是我最后的NamingStrategy：

I got the same exception: org.hibernate.DuplicateMappingException: Same physical table name... Through using the debugger, I had an epiphany that maybe I wasn't using DefaultNamingStrategy to begin with! So I changed my base class to org.hibernate.cfg.EJB3NamingStrategy. This is more appropriate when using JPA Annotations, I believe! Here was my final NamingStrategy:

package my.package;

import org.apache.commons.lang.StringUtils;
import org.hibernate.cfg.EJB3NamingStrategy;

public class LowerCaseNamingStrategy extends EJB3NamingStrategy {
    @Override
    public String classToTableName(String className) {
        return StringUtils.lowerCase(super.classToTableName(className));
    }

    @Override
    public String collectionTableName(String ownerEntity, String ownerEntityTable, String associatedEntity,
            String associatedEntityTable, String propertyName) {
        return StringUtils.lowerCase(super.collectionTableName(ownerEntity, ownerEntityTable, associatedEntity, associatedEntityTable, propertyName));
    }

    @Override
    public String logicalCollectionTableName(String tableName, String ownerEntityTable, String associatedEntityTable,
            String propertyName) {
        return StringUtils.lowerCase(super.logicalCollectionTableName(tableName, ownerEntityTable, associatedEntityTable, propertyName));
    }

    @Override
    public String tableName(String tableName) {
        return StringUtils.lowerCase(super.tableName(tableName));
    }
}

PS dursun以前的解决方案并不适合我。

PS the previous solution by dursun did not work for me.

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