我试图在Scala + Hibernate中实现一对多关系(一个银行有很多分支)。我收到以下错误:
创建初始SessionFactory failed.org.hibernate.AnnotationException:非法尝试映射非 收集为@OneToMany,@ ManyToMany或@CollectionOfElements: admin.bank.manage.BankHib.branches
这些是表格:
CREATE TABLE banks (
sk int NOT NULL,
code varchar(10) DEFAULT NULL,
name varchar(100) DEFAULT NULL,
version smallint DEFAULT NULL,
PRIMARY KEY (sk)
)
CREATE TABLE branches (
sk smallint NOT NULL,
code varchar(10) DEFAULT NULL,
name varchar(100) NOT NULL,
descrip varchar(200) DEFAULT NULL,
bank_sk tinyint NOT NULL, // <== this is the bank sk column
notes text,
version smallint DEFAULT NULL,
state char(2) NOT NULL,
city varchar(45) DEFAULT NULL,
county varchar(45) DEFAULT NULL,
county_id int DEFAULT NULL,
zipcode varchar(20) DEFAULT NULL,
PRIMARY KEY (sk)
)
这些是Hibernate类:
@Entity
@Table(name = "banks")
class BankHib {
@Id
var sk: Int = _
var code: String = _
var name: String = _
var version: Int = _
@OneToMany(orphanRemoval=false)
@JoinColumn(name="bank_sk")
var branches: Seq[BranchHib] = _
}
@Entity
@Table(name = "branches")
class BranchHib {
@Id
var sk: Int = _
var code: String = _
var name: String = _
var descrip: String = _
var city: String = _
var county: String = _
@Column(name = "county_id")
var countyId: Int = _
var state: String = _
var zipCode: String = _
var notes: String = _
@ManyToOne
@JoinColumn(name="bank_sk", nullable=false)
var bank: BankHib = _
var version: Int = _
}
当我运行一系列应该检索相关银行的分支时,会发生错误:
val list = session.createQuery("from BranchHib order by name").list.
asScala.toList.map(_.asInstanceOf[BranchHib])
如何使这项工作?
答案 0 :(得分:1)
Hibernate user guide声明:
Hibernate使用自己的集合实现,这些集合实现了惰性加载,缓存或状态更改检测语义。因此,必须将持久集合声明为接口类型。实际界面可能是
java.util.Collection
,java.util.List
,java.util.Set
,java.util.Map
,java.util.SortedSet
,java.util.SortedMap
或甚至其他对象类型(意味着您将拥有编写org.hibernate.usertype.UserCollectionType
)的实现。
@OneToMany(orphanRemoval=false)
@JoinColumn(name="bank_sk")
var branches: Seq[BranchHib] = _
您将branches
定义为Seq
,但Hibernate无法识别Scala集合类型。将branches
的类型更改为java.util.List[BranchHib]
。
答案 1 :(得分:0)
使用java.util.List而不是Seq:
@OneToMany
@JoinColumn(name="bank_sk")
var branches: java.util.List[BranchHib] = _