Question

我在Parent中提供了一个简单的oneToMany关系，并在Chile Entity类中提供了相应的ManyToOne：

家长：

@Entity
@Table(name = "FormExtraInfo")
@PrimaryKeyJoinColumn(name="form_container_id")
public class Form extends Container {

private List<Reason> reasons = new ArrayList<Reason>();

@OneToMany(mappedBy="form",cascade={javax.persistence.CascadeType.ALL},orphanRemoval=true)
@Cascade(value={CascadeType.ALL})
public List<Reason> getReasons() {
    return reasons;
}

public void setReasons(List<Reason> reasons) {
    this.reasons = reasons;
}

public void addReason(Reason reason) {
    if (this.reasons == null) {
        this.reasons = new ArrayList<Reason>();
    }

    this.reasons.add(reason);
}

}

儿童班：

@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name="Container_id")
public Form getForm() {
    return form;
}

public void setForm(Form form) {
    this.form = form;
}

动作类：

//Set the reasons
    String[] reasonStatus = strutsForm.getMultiValueProperty(REASON_STATUS);
    String[] reasonText = strutsForm.getMultiValueProperty(REASON_TEXT);

    List<Reason> reasons = new ArrayList<Reason>();     

    logger.debug("form container ID : " + form.getId() +". # of Reasons for this form: "+ reasonText.length);

    for (int i = 0; i < reasonText.length; i++) {
        Reason r = new Reason();
        r.setComment(reasonText[i]);
        r.setStatusTypeCode(reasonStatus[i]);
        r.setForm(form); 
        reasons.add(r);
    }
    form.setReasons(reasons);

示例案例： Status_code Reason_text abc abc1 xyz xyz1

保存表单： Status_code Reason_text abc abc1 xyz xyz1 abc abc1 xyz xyz1

对于任何操作：新插入或删除或更新，它首先将旧数据复制到数据库，然后复制我执行的操作。

Answer 1

尝试替换此

的cascade子句

@Cascade (value={CascadeType.SAVE_UPDATE,CascadeType.DELETE_ORPHAN})

查看关于映射一对多http://arecordon.blogspot.com.ar/2013/05/hibernate-mapping-associations-one-to_20.html

的博客文章

Answer 2

如果您可以使用Set而不是List;然后，尝试将集合更改为Set，并确保覆盖equals（）hashCode（），如下所示：

https://community.jboss.org/wiki/EqualsAndHashCode?_sscc=t

另外，删除重复的级联，你可以使用：

@OneToMany(mappedBy="form",cascade={javax.persistence.CascadeType.ALL},orphanRemoval=true)

或

@OneToMany(mappedBy="form")
@Cascade(value={CascadeType.ALL, org.hibernate.annotations.CascadeType.DELETE_ORPHAN})

Hibernate OneToMany mappedby在保存时插入重复记录

2 个答案: