休眠标准包含在与表的关联中 [英] Hibernate Criteria contains-in on an association to a table

问题描述

我有一个类似于以下的Hibernate映射：

I have a Hibernate mapping that looks something like this:

<class name="MyEntity">
  <set name="scalarSet" table="(select fk, scalar_value from other_table)">
    <key column="fk"/>
    <property column="scalar_value" type="long"/>
  </set>
</class

鉴于此，如何查询MyEntity的值.scalarSet（已设置为Set）在另一个集合中。

Given this, how do I query such that a value of MyEntity.scalarSet (which is Set) is in a another collection.

类似的东西：

criteria.add(Restrictions.in("scalarSet", targetList));

[edit]
我也尝试过Restriction.sqlRestriction（..）。我使用的sql查询如下所示：

[edit] I've also tried Restriction.sqlRestriction(..). The sql query that I used is something like this:

"1 == (select fk, scalar_value from other_table where fk = {alias}.id and scalar_value in ({expanding?})"

其中'{expanding？}'替换为逗号分隔的问号（取决于targetList.size（））。

Wherein '{expanding?}' is replaced by comma-separated question marks (depending on targetList.size()).

但是我只是得到

原因：org.hibernate.MappingException：集合不是关联：MyEntity.scalarSet

Caused by: org.hibernate.MappingException: collection was not an association: MyEntity.scalarSet

推荐答案

您的集合是一个集合，而不是关联映射-有一些细微但重要的区别。使用Hibernate的Query API进行集合目前不支持。

Your set is a collection, not an association mapping - there are subtle but important differences. Using Hibernate's Query API for collections is currently not supported.

您需要使用HQL或使用一个通过创建具有Long属性的实体进行多对多关联映射，例如：

You need to either use HQL, or use a one-to-many association mapping by creating an entity with Long property, for example:

public class Scalar {
  private Long value;
  public Long getValue() { .... }
  public void setValue(....) { ....}
}

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