Question

我正在尝试强制JPA / Hibernate生成并仅使用小写的表名。我已经实现了这样的NamingStrategy：

public class MyNamingStrategy extends DefaultNamingStrategy {

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

我已经通过在persistence.xml中设置此属性来应用它：

<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：

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)

是什么？

相同的物理表名[planning]引用了几个逻辑表名称：[Planning]，[OrderProductMan_Planning]

意思？

错误中的实体，尽可能简化。如果您需要其余的，请告诉我。

@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;
   // ...
 }

Answer 1

波格丹，谢谢发布此内容。我在Linux上使用Hibernate / JPA / MySQL的Unix / Windows可移植性的区分大小写的表名也有类似的问题。

和你一样，我打算通过在META-INF / persistence.xml文件中配置自定义NamingStrategy来将我的表名绑定为全小写：

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

我得到了同样的异常：org.hibernate.DuplicateMappingException：相同的物理表名...通过使用调试器，我有一个顿悟可能我没有使用DefaultNamingStrategy开始！所以我将我的基类改为org.hibernate.cfg.EJB3NamingStrategy 。我认为，这在使用JPA Annotations时更合适！这是我最后的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以前的dursun解决方案对我不起作用。

“org.hibernate.DuplicateMappingException”错误是什么意思？

1 个答案: