[英]Count and group with Hibernate Panache
我有两张桌子,它们之间是One to Many
关系。 它们的定义如下:
@Entity
@Table(name = "accounts")
data class Account(
@field:Id
var id: UUID? = null,
@ManyToOne
var gender: Gender? = null,
var birthday: Long = 0) {
@ManyToMany(fetch = FetchType.EAGER, cascade = [CascadeType.MERGE])
@JoinTable(
name = "account_interests",
joinColumns = [JoinColumn(name = "account_id")],
inverseJoinColumns = [JoinColumn(name = "interest_id")]
)
var interests: Interests = emptyList()
}
@Entity
@Table(name = "genders")
data class Gender(
@field:Id
var abbr: Char? = null,
var description: String = ""
)
我想从数据库中选择数据,我首先使用 SQL:
SELECT g.description, a.gender_abbr, count(a.gender_abbr)
from accounts a
inner join genders g on g.abbr = a.gender_abbr
group by a.gender_abbr, g.description
问题是,如何将上述 SQL 转换为 hibernate panache HQL?
我想这样的事情可以做到吗?
select g.description, g.abbr, count(p)
from Account a
inner join a.gender as g
group by g.abbr, g.description
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