希望有人能帮助我解决这个问题。JPA Hibernate父/子映射混淆
我试图创建使用JPA/Hibernate的两个实体之间的双向连接。
我有这个问题,这似乎指出,我的数据库列名称需要匹配我的价值对象属性名称 - 但这似乎很奇怪。希望有人能帮助我,提供一些清晰。
不幸的是,我处于一个明亮的星星命名列名无意义名称的位置。 我不能改变列名 - 相信我 - 如果可以的话 - 我会的!
因此,这里是我的架构是什么样子: -
Customer
========
CS1 -- The ID column
CS2 -- Customer Description
ContactDetails
==============
CD1 -- The ID column
CD2 -- The FK to the Customer table
...
正如你所期望我有两个价值目标,我的应用程序内 - 这些看起来像这样: -
Customer.java
@Entity
@Table("Customer")
public class Customer {
@Id
@GeneratedValue(strategy = IDENTITY)
@Column(name = "CS1", nullable=false, columnDefinition="INTEGER")
private int id;
}
@OneToMany (cascade = CascadeType.ALL, mappedBy = "customerId", fetch = FetchType.EAGER)
private Set <ContactDetailsVO> contactDetails = new HashSet <CustomerDetailsVO>();
}
ContactDetails.java
public class ContactDetails {
@Id
@GeneratedValue(strategy = IDENTITY)
@Column(name = "CD1", nullable=false, columnDefinition="INTEGER")
private int id;
@Column(name = "CD2")
long customerId;
@ManyToOne(optional = false)
@JoinColumn(name = "customerId", referencedColumnName = "id")
private CustomerVO customer;
public CustomerVO getCustomer() {
return customer;
}
public void setCustomer(CustomerVO customer) {
this.customer = customer;
}
}
不幸的是,引用对象的这种做法属性名称,用于映射关系似乎并没有工作 - 我得到以下,在启动时: -
Caused by: org.hibernate.HibernateException: Missing column: customerId in TestDB.dbo.ContactDetails
at org.hibernate.mapping.Table.validateColumns(Table.java:276)
at org.hibernate.cfg.Configuration.validateSchema(Configuration.java:131
所以,如果我再改变映射使实际使用中的表的列名,而不是,我得到如下: -
Customer.java
@Entity
@Table("Customer")
public class Customer {
@Id
@GeneratedValue(strategy = IDENTITY)
@Column(name = "CS1", nullable=false, columnDefinition="INTEGER")
private int id;
}
@OneToMany (cascade = CascadeType.ALL, mappedBy = "CD2", fetch = FetchType.EAGER)
private Set <ContactDetailsVO> contactDetails = new HashSet <CustomerDetailsVO>();
}
ContactDetails.java
public class ContactDetails {
@Id
@GeneratedValue(strategy = IDENTITY)
@Column(name = "CD1", nullable=false, columnDefinition="INTEGER")
private int id;
@Column(name = "CD2")
long customerId;
@ManyToOne(optional = false)
@JoinColumn(name = "CD2", referencedColumnName = "CS1")
private CustomerVO customer;
public CustomerVO getCustomer() {
return customer;
}
public void setCustomer(CustomerVO customer) {
this.customer = customer;
}
}
然后我得到如下: -
Caused by: org.hibernate.MappingException: Could not determine type for:
com.myCompany.model.vo.CustomerVO, at table: ContactDetails, for columns:
[org.hibernate.mapping.Column(customer)]
at org.hibernate.mapping.SimpleValue.getType(SimpleValue.java:306)
正如我说,要解决这个明显的方式就是将其命名我的对象的属性,一样的表列名称 - 但考虑到命名表列的愚蠢,我宁愿将它隔离我的应用程序。
有人可以帮助揭开这种奇怪的行为吗?
在此先感谢。