java我们如何在eclipseLink中使用自己的集合进行延迟加载?
我想使用MyCollection实现java提供的收集接口。eclipselink使用它自己的实现(间接列表),它可以很好地用于快速加载,但对于延迟加载,eclipselink使用它自己的实现(间接列表)。是否可以使用MyCollection进行延迟加载
我的收集代码如下:
package com.alta.convertor;
import java.util.Collection;
import java.util.Iterator;
import java.util.Vector;
public class MyCollection<E> implements Collection<E>,Cloneable{
Collection<E> collection;
@SuppressWarnings({ "unchecked", "rawtypes" })
public MyCollection() {
this(new Vector());
}
public MyCollection(Collection<E> collection) {
this.collection=collection;
}
@Override
public int size() {
return collection.size();
}
@Override
public boolean isEmpty() {
return collection.isEmpty();
}
@Override
public boolean contains(Object o) {
return collection.contains(o);
}
@Override
public Iterator<E> iterator() {
return collection.iterator();
}
@Override
public Object[] toArray() {
return collection.toArray();
}
@Override
public <T> T[] toArray(T[] a) {
return collection.toArray(a);
}
@Override
public boolean add(E e) {
return false;
}
@Override
public boolean remove(Object o) {
return collection.remove(o);
}
@Override
public boolean containsAll(Collection<?> c) {
return collection.containsAll(c);
}
@Override
public boolean addAll(Collection<? extends E> c) {
return collection.addAll(c);
}
@Override
public boolean removeAll(Collection<?> c) {
return collection.removeAll(c);
}
@Override
public boolean retainAll(Collection<?> c) {
return collection.retainAll(c);
}
@Override
public void clear() {
collection.clear();
}
}
我的实体类为:
@Entity
public class Person implements Serializable{
/**
*
*/
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
@Column(name="personid")
private Long personId;
private String firstName;
private String lastName;
private String email;
@OneToMany(cascade = CascadeType.ALL,mappedBy="person",targetEntity=Address.class,fetch=FetchType.EAGER)
私有MyCollection地址数组
public Person() {
}
public Person(String firstName, String lastName, String email) {
super();
this.firstName = firstName;
this.lastName = lastName;
this.email = email;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public MyCollection<Address> getAddressArray() {
return addressArray;
}
public void setAddressArray(MyCollection<Address> address) {
this.addressArray = address;
}
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
public Long getPersonId() {
return personId;
}
public void setPersonId(Long personId) {
this.personId = personId;
}
}
# 1 楼答案
目前还没有,您需要使用一个集合接口来允许延迟(列表、集合、映射)。如果使用“渴望”,则可以使用自己的收藏类型
然而,我目前正在处理这个问题,很可能很快就会检查到2.6的修复
https://bugs.eclipse.org/bugs/show_bug.cgi?id=411819
一般来说,如果可以的话,最好还是使用集合接口。 您还可以将关系包装在一个代表您的集合的可嵌入文件中