关联的Hibernate自定义连接子句

这是一个使用标准父/子范例的示例，我认为应该使用基本的@Where注释来工作。

public class A {  ...  @ManyToOne(fetch = FetchType.EAGER) // EAGER forces outer join  @JoinColumn(name = "a_id")  @Where(clause = "a_id = id or a_id is null") // "id" is A's PK... modify as needed  public B getB() { return b; }}public class B {  ...  @oneToMany(mappedBy = "b")  public List<A> getA() { return a; }}