多表上的Hibernate条件查询

我有三张表，分别是School、SchoolType和Country。你可以看到学校和学校类型之间的关系。我想质疑的是

选择与至少有一所名为blabla的学校类型具有相同id的国家/地区

我的学校班级

@JoinColumn(name = "school_type_ref", referencedColumnName = "school")
@ManyToOne(cascade = CascadeType.ALL, optional = false, fetch = FetchType.EAGER)
private SchoolType schooltype;

我的学校型班级

@LazyCollection(LazyCollectionOption.FALSE)
@OneToMany(cascade = CascadeType.ALL, mappedBy = "schooltype")
private List<School> schoolList;

private String id;

选中此项：

CriteriaBuilder cb = entityManager.getCriteriaBuilder();
CriteriaQuery<Country> c = cb.createQuery(Country.class);
Root<Country> countries = c.from(Country.class);

Subquery<Integer> sq = c.subquery(Integer.class);
Root<SchoolType> schoolTypes = sq.from(SchoolType.class);

sq.select(schoolTypes.<Integer>get("id")).where(
    cb.equal(schoolTypes.get("schoolList").get("name"), "blabla"));

c.select(countries).where(cb.in(countries.<Integer>get("id")).value(sq));

TypedQuery<Country> q = entityManager.createQuery(c);
List<Country> result = q.getResultList();

也可以尝试使用schoolTypes.getid代替schoolTypes.getSchoolType\uuid，但它对我不起作用

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我的答案是基于

您希望查询的条件：SELECT*来自名称为'blabla'的学校中id在SELECT SHOOL_type_ref中的国家/地区？国家与学校类型相关吗？@paulek我认为这是正确的版本：SELECT*从id位于SELECT type.id FROM SHOOLTYPE的国家加入学校scl on type.SHOOL=scl.SHOOLTYPE和scl.name='blabla'

CriteriaBuilder cb = entityManager.getCriteriaBuilder();
CriteriaQuery<Country> c = cb.createQuery(Country.class);
Root<Country> countries = c.from(Country.class);

Subquery<Integer> sq = c.subquery(Integer.class);
Root<SchoolType> schoolTypes = sq.from(SchoolType.class);

sq.select(schoolTypes.<Integer>get("id")).where(
    cb.equal(schoolTypes.get("schoolList").get("name"), "blabla"));

c.select(countries).where(cb.in(countries.<Integer>get("id")).value(sq));

TypedQuery<Country> q = entityManager.createQuery(c);
List<Country> result = q.getResultList();