雙向休眠關係

我有一個使用hibernate和以下實體的web應用程序。我在做什麼錯？雙向休眠關係

... 
@Entity 
public class Registration implements BaseEntity { 
... 
@OneToMany(cascade = {CascadeType.PERSIST}, mappedBy = "registration", fetch = FetchType.EAGER) 
private List<OrderedProduct> orderedProducts = new ArrayList<OrderedProduct>(); 
... 
public List<OrderedProduct> getOrderedProducts() { 
    return orderedProducts; 
} 

public void setOrderedProducts(List<OrderedProduct> orderedProducts) { 
    this.orderedProducts = orderedProducts; 
} 
...

... 
@Entity 
public class OrderedProduct implements BaseEntity { 
... 
@ManyToOne 
@JoinColumn(name = "registration_id",nullable = true) 
private Registration registration; 
... 
public Registration getRegistration() { 
    return registration; 
} 
public void setRegistration(Registration registration) { 
    this.registration = registration; 
} 
...

當我用這個，我得到以下Tomcat的錯誤：

Caused by: org.hibernate.AnnotationException: Illegal use of mappedBy on both sides of the relationship: at.irian.conference.domain.Registration.orderedProducts 
    at org.hibernate.cfg.annotations.TableBinder.bindFk(TableBinder.java:193) 
    at org.hibernate.cfg.annotations.CollectionBinder.bindCollectionSecondPass(CollectionBinder.java:1325) 
    at org.hibernate.cfg.annotations.CollectionBinder.bindManyToManySecondPass(CollectionBinder.java:1164) 
    at org.hibernate.cfg.annotations.CollectionBinder.bindStarToManySecondPass(CollectionBinder.java:602) 
    at org.hibernate.cfg.annotations.CollectionBinder$1.secondPass(CollectionBinder.java:543) 
    at org.hibernate.cfg.CollectionSecondPass.doSecondPass(CollectionSecondPass.java:66) 
    at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1163) 
    at org.hibernate.cfg.AnnotationConfiguration.secondPassCompile(AnnotationConfiguration.java:329) 
    at org.hibernate.cfg.Configuration.buildMappings(Configuration.java:1148) 
    at org.hibernate.ejb.Ejb3Configuration.buildMappings(Ejb3Configuration.java:1226) 
    at org.hibernate.ejb.EventListenerConfigurator.configure(EventListenerConfigurator.java:173) 
    at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:854) 
    at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:425) 
    at org.hibernate.ejb.HibernatePersistence.createContainerEntityManagerFactory(HibernatePersistence.java:131) 
    at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:221) 
    at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:251) 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1288) 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1257) 
    ... 86 more

來源

2009-06-24 ddejmek

你的關係是什麼樣的？註冊[1] - > [0..n] OrderProducts，你想映射它的雙向？ – lud0h 2009-06-24 20:06:16

一個註冊有很多orderedProducts => 1：n – ddejmek 2009-06-25 06:47:04

映射集與列表需要在數據庫映射「序列」列中。你打算用作爲集

來源

2009-06-24 14:28:44 Surya

這段代碼是正確的，我忘了刪除其他關係

來源

2009-06-25 08:01:41 ddejmek

我不知道使用註釋語法。我們習慣於像下面那樣定義這樣的關係。

Registration.hbm.xml

<bag 
    name="orderedProducts" 
    inverse="true" 
    cascade="appropriate-one" 
> 
    <key> 
     <column name="REGISTRATION_ID" /> 
    </key> 
    <one-to-many 
     class="orderedProducts" 
    /> 
</bag>

OrderedProducts.hbm.xml

<many-to-one 
    name="registration" 
    class="Registration" 
> 
    <column name="REGISTRATION_ID"/> 
</many-to-one>

來源

2009-06-25 08:14:01 lud0h

嘗試類似的註解如下。它會解決你的問題。

@ManyToOne(fetch = FetchType.EAGER) 

@JoinColumn(name = "registration_id") 

public Registration getRegistration() { 
    return registration; 
} 

public void setRegistration(Registration registration) { 
    this.registration = registration; 
} 

@OneToMany(fetch = FetchType.EAGER, targetEntity = Registration.class, mappedBy = "registration", cascade = { CascadeType.ALL }) 
@Cascade(org.hibernate.annotations.CascadeType.DELETE_ORPHAN) 
@Fetch(FetchMode.SELECT) 
@JoinColumn(name = "registration_id")

來源

2009-10-20 11:05:27 Ashok

雙向休眠關係

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