标准查询多对多

Question

我已经创建了下面提到的SQL的HQL，但我无法通过Criteria和Sub查询来执行它。请帮助我通过Criteria执行以下查询（SQL & HQL）。感谢提前 ...

SQL：

SELECT * FROM app_interface ain WHERE ain.id IN (SELECT ai.id FROM app_interface ai INNER JOIN app_module_interface ami ON ami.interface_id = ai.id INNER JOIN app_module am ON am.id = ami.module_id WHERE am.id = :id 

HQL：

FROM AppModule oam WHERE oam.id IN(SELECT am.id FROM AppModule am INNER JOIN am.appRoles ar WHERE ar.id = :id) 

通过所需的标准... .. ?????

场景：

public class AppModule implements java.io.Serializable { 
@Id 
@GeneratedValue(strategy = GenerationType.AUTO) 
@Column(name = "id", unique = true, nullable = false) 
private Integer id; 

@ManyToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY, mappedBy = "appModules") 
private Set<AppRole> appRoles = new HashSet<AppRole>(0); 

}

公共类AppRole实现java.io.Serializable {

@Id 
@GeneratedValue(strategy = GenerationType.AUTO) 
@Column(name = "id", unique = true, nullable = false) 
private Integer id; 

@ManyToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY) 
@OrderBy("name") 
@JoinTable(name = "app_role_module", joinColumns = { 
@JoinColumn(name = "role_id", nullable = false, updatable = false)}, inverseJoinColumns = { 
    @JoinColumn(name = "module_id", nullable = false, updatable = false)}) 
private Set<AppModule> appModules = new HashSet<AppModule>(0); 

}

Answer 1

嗯，首先，你的查询太复杂。它可以被改写为

select distinct am from AppModule am 
inner join am.appRoles ar 
WHERE ar.id = :id 

我不知道为什么你要使用的标准，而不是这种简单易读的HQL查询，但如果你真的想要，然后用

Criteria c = session.createCriteria(AppModule.class, "am"); 
c.createAlias("am.appRoles", "ar"); 
c.add(Restrictions.eq("ar.id", theRoleId)); 
c.setResultTransformer(Criteria.DISTINCT_ROOT_ENTITY); 

编辑：

如果你想实现查询

from AppModule oam WHERE oam.id not in (
    select am.id from AppModule am inner am.appRoles ar where ar.id = :id) 

，那么你可以使用下面的代码：

DetachedCriteria dc = DetachedCriteria.forClass(AppModule.class, "am"); 
dc.createAlias("am.appRoles", "ar"); 
dc.add(Restrictions.eq("ar.id", theRoleId)); 
dc.setProjection(Projections.id()); 

Criteria c = session.createCriteria(AppModule.class, "oam"); 
c.add(SubQueries.propertyNotIn("oam.id", dc));