Java JPA、Spring、Hibernate加载实体多关联的问题
我正试图从关联N:N获取数据,但收到的是空白字段。Java JPA、Spring、Hibernate加载实体多关联的问题,java,hibernate,spring,orm,jpa,Java,Hibernate,Spring,Orm,Jpa,我正试图从关联N:N获取数据,但收到的是空白字段。 下面是我的Hibernate映射类: @Entity @Table(name = "companies") public class Company extends NamedEntity { //some_code @ManyToMany( targetEntity = com.hqcargo.shippingstock.domain.CompanyProfile.class, cascade = {Cas
下面是我的Hibernate映射类:
@Entity
@Table(name = "companies")
public class Company extends NamedEntity {
//some_code
@ManyToMany(
targetEntity = com.hqcargo.shippingstock.domain.CompanyProfile.class,
cascade = {CascadeType.ALL, CascadeType.ALL },
fetch = FetchType.EAGER
)
@JoinTable(
name = "company_company_profiles",
joinColumns = {@JoinColumn(
name = "company_id",
referencedColumnName = "id") },
inverseJoinColumns = {@JoinColumn(
name = "company_profile_id",
referencedColumnName = "id") }
)
private List<CompanyProfile> profiles;
// getters and setters + other code
当我更新每个都正常时(由Hibernate生成sql):
但是,当我加载数据时,我不会从company\u company\u概要文件(由Hibernate生成的sql)中获取信息
您看到我的代码中有任何错误吗?我不确定这是问题的原因,但您不应该在多对多关联的两侧指定一个
可连接的
。根据JPA规范,JoinTable
注释位于关联的拥有方(Company
,在您的情况下):
9.1.25可接合注释
JoinTable
注释用于
关联的映射。A.
JoinTable
注释在
一个多对多系统的拥有方
关联,或以单向方式
一对多关联
因此,在公司档案
实体中删除它:
@Entity
@Table(name = "company_profiles")
public class CompanyProfile extends NamedEntity {
//some_code
@ManyToMany(
targetEntity = com.hqcargo.shippingstock.domain.Company.class,
cascade = {CascadeType.ALL, CascadeType.ALL },
mappedBy = "profiles",
fetch = FetchType.EAGER
)
private List<Company> companies;
// getters and setters + other code
}
@实体
@表(name=“公司概况”)
公共类CompanyProfile扩展了NamedEntity{
//一些代码
@许多(
targetEntity=com.hqcargo.shippingstock.domain.Company.class,
cascade={CascadeType.ALL,CascadeType.ALL},
mappedBy=“profiles”,
fetch=FetchType.EAGER
)
私人上市公司;
//getter和setter+其他代码
}
然后再试一次
工具书类
- JPA1.0规范
- 第2.1.8.4节“双向多人关系”
- 第9.1.25节“可接合注释”
- 第9.1.26节“多个注释”
。根据JPA规范,JoinTable
注释位于关联的拥有方(Company
,在您的情况下):
9.1.25可接合注释
JoinTable
注释用于
关联的映射。A.
JoinTable
注释在
一个多对多系统的拥有方
关联,或以单向方式
一对多关联
因此,在公司档案
实体中删除它:
@Entity
@Table(name = "company_profiles")
public class CompanyProfile extends NamedEntity {
//some_code
@ManyToMany(
targetEntity = com.hqcargo.shippingstock.domain.Company.class,
cascade = {CascadeType.ALL, CascadeType.ALL },
mappedBy = "profiles",
fetch = FetchType.EAGER
)
private List<Company> companies;
// getters and setters + other code
}
@实体
@表(name=“公司概况”)
公共类CompanyProfile扩展了NamedEntity{
//一些代码
@许多(
targetEntity=com.hqcargo.shippingstock.domain.Company.class,
cascade={CascadeType.ALL,CascadeType.ALL},
mappedBy=“profiles”,
fetch=FetchType.EAGER
)
私人上市公司;
//getter和setter+其他代码
}
然后再试一次
工具书类
- JPA1.0规范
- 第2.1.8.4节“双向多人关系”
- 第9.1.25节“可接合注释”
- 第9.1.26节“多个注释”
251252 [13627369@qtp-8132032-9] DEBUG org.hibernate.SQL -
update
companies
set
name=?,
where
id=?
Hibernate:
update
companies
set
name=?,
where
id=?
251295 [13627369@qtp-8132032-9] DEBUG org.hibernate.SQL -
insert
into
company_company_profiles
(company_id, company_profile_id)
values
(?, ?)
Hibernate:
insert
into
company_company_profiles
(company_id, company_profile_id)
values
(?, ?)
36088 [13507994@qtp-8132032-13] DEBUG org.hibernate.SQL -
select
companies0_.company_profile_id as company2_8_,
companies0_.company_id as company1_8_,
company1_.id as id3_0_,
company1_.name as name3_0_,
from
company_company_profiles companies0_
left outer join
companies company1_
on companies0_.company_id=company1_.id
where
companies0_.company_profile_id=?
Hibernate:
select
companies0_.company_profile_id as company2_8_,
companies0_.company_id as company1_8_,
company1_.id as id3_0_,
company1_.name as name3_0_,
from
company_company_profiles companies0_
left outer join
companies company1_
on companies0_.company_id=company1_.id
where
companies0_.company_profile_id=?
@Entity
@Table(name = "company_profiles")
public class CompanyProfile extends NamedEntity {
//some_code
@ManyToMany(
targetEntity = com.hqcargo.shippingstock.domain.Company.class,
cascade = {CascadeType.ALL, CascadeType.ALL },
mappedBy = "profiles",
fetch = FetchType.EAGER
)
private List<Company> companies;
// getters and setters + other code
}