Java 多对多查询jpql
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时间：2020-08-12 09:19:37 来源:igfitidea点击:
Many-to-Many query jpql
提问by Skizzo
I have the followed trouble.
我有以下麻烦。
There is an entity Distributor who is connected with the ManyToMany relationship to entity town:
有一个实体 Distributor 与实体镇的 ManyToMany 关系连接：
@Entity
public class Distributor{
@ManyToMany
@JoinTable( name = "GS_DISTRIBUTOR_TOWN",
joinColumns = @JoinColumn(name = "CD_DISTRIBUTOR"),
inverseJoinColumns = @JoinColumn(name = "CD_TOWN") )
private List<Town> towns;
....
}
Then the entity town is also in relation with District
那么实体镇也与District有关
@Entity
public class Town{
@ManyToMany(mappedBy="towns")
private List<Distributor> distributors;
@ManyToOne
private District district;
....
}
Now i have to filter(with jpql) all distributor who are in a district. How can i do?
现在我必须过滤（使用 jpql）所有在一个地区的经销商。我能怎么做？
采纳答案by James
select distinct distributor
from Distributor distributor
join distributor.towns town
join town.district district
where district.name = :name
