多个关联的 Hibernate 查询

Question

我在JAVA中有以下结构。

public class Article {
    private long id;
    private Source source;
}

public class Source {
    private long id;
    private Type type;
}

public class Type {
    private long id;
    private String sourceType;
}

如何使用 Hibernate Criteria 查询所有带有 Type.id = somevalue 的文章。现在我只能像这样

查询直到Source class

Criteria query = currentSession().createCriteria(Article.class)
            .createAlias("source", "s")
            .add(Restrictions.eq("s.id", Long.parseLong(typeId)));

Answer 1

试试这个

Criteria query = currentSession().createCriteria(Article.class)
        .createAlias("source", "s")
        .createAlias("s.type","t")
        .add(Restrictions.eq("t.id", Long.parseLong(typeId)));