Spring JPA：一对一关系中的共享PK问题

我正试图用一个共享的PK建立一对一的关系，但在尝试了很多事情之后，我感到很失落

我将尽力提供所有可能的信息：

我正在使用的技术：

spring.datasource.url = jdbc:mysql://localhost:3306/customers?serverTimezone=UTC&useSSL=false&allowPublicKeyRetrieval=true&useSSL=false
spring.datasource.username = admin
spring.datasource.password = root

spring.jpa.database-platform = org.hibernate.dialect.MySQL5InnoDBDialect
spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5InnoDBDialect
spring.jpa.show-sql = true

@Getter
@Setter
@NoArgsConstructor
@Entity
@Table(name = "customer", schema = "customers")
public class Customer {

    @Id
    @GeneratedValue(generator = "uuid2")
    @GenericGenerator(name = "uuid2", strategy = "uuid2")
    @Column(name = "customer_id", columnDefinition = "BINARY(16)")
    private UUID customerId;

    @OneToOne(mappedBy = "customer", cascade = CascadeType.ALL)
    private Address address;
}

@Getter
@Setter
@NoArgsConstructor
@Entity
@Table(name = "address", schema = "customers")
public class Address {

    @Id
    @Column(name = "address_id", columnDefinition = "BINARY(16)")
    private UUID addressId;

    @OneToOne(fetch = FetchType.LAZY)
    @MapsId
    private Customer customer;
}

CREATE SCHEMA IF NOT EXISTS CUSTOMERS;

CREATE TABLE CUSTOMERS.CUSTOMER
(
    customer_id BINARY(16) NOT NULL PRIMARY KEY,
) ENGINE = InnoDB;

CREATE TABLE CUSTOMERS.ADDRESS
(
    address_id BINARY(16) NOT NULL PRIMARY KEY,
) ENGINE = InnoDB;

ALTER table CUSTOMERS.ADDRESS
ADD CONSTRAINT fk_customer_address
FOREIGN KEY (address_id)
REFERENCES CUSTOMERS.CUSTOMER (customer_id);

@RunWith(SpringRunner.class)
@SpringBootTest
public class CustomerRepositoryIntegrationTest {

    @Autowired
    private CustomerRepository cut;

    @Test
        public void testSaveAndDeleteCustomer() {
            Address address = new Address();
            Customer customer = new Customer();
            customer.setAddress(address);

            cut.save(customer);

            Customer retrievedCustomer = cut.findAll().get(0);
            assertEquals(customer, retrievedCustomer);
        }
}

ERROR] testSaveAndDeleteCustomer(com.foxhound.customers.repositories.CustomerRepositoryIntegrationTest)  Time elapsed: 0.034 s  <<< ERROR!
org.springframework.orm.jpa.JpaSystemException: attempted to assign id from null one-to-one property [com.foxhound.customers.models.Address.customer]; nested exception is org.hibernate.id.IdentifierGenerationException: attempted to assign id from null one-to-one property [com.foxhound.customers.models.Address.customer]
    at com.foxhound.customers.repositories.CustomerRepositoryIntegrationTest.testSaveAndDeleteCustomer(CustomerRepositoryIntegrationTest.java:47)
Caused by: org.hibernate.id.IdentifierGenerationException: attempted to assign id from null one-to-one property [com.foxhound.customers.models.Address.customer]
    at com.foxhound.customers.repositories.CustomerRepositoryIntegrationTest.testSaveAndDeleteCustomer(CustomerRepositoryIntegrationTest.java:47)

• 弹簧靴2.1.5
• 春季少年警讯
• 飞行路线

数据源配置：

spring.datasource.url = jdbc:mysql://localhost:3306/customers?serverTimezone=UTC&useSSL=false&allowPublicKeyRetrieval=true&useSSL=false
spring.datasource.username = admin
spring.datasource.password = root

spring.jpa.database-platform = org.hibernate.dialect.MySQL5InnoDBDialect
spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5InnoDBDialect
spring.jpa.show-sql = true

@Getter
@Setter
@NoArgsConstructor
@Entity
@Table(name = "customer", schema = "customers")
public class Customer {

    @Id
    @GeneratedValue(generator = "uuid2")
    @GenericGenerator(name = "uuid2", strategy = "uuid2")
    @Column(name = "customer_id", columnDefinition = "BINARY(16)")
    private UUID customerId;

    @OneToOne(mappedBy = "customer", cascade = CascadeType.ALL)
    private Address address;
}

@Getter
@Setter
@NoArgsConstructor
@Entity
@Table(name = "address", schema = "customers")
public class Address {

    @Id
    @Column(name = "address_id", columnDefinition = "BINARY(16)")
    private UUID addressId;

    @OneToOne(fetch = FetchType.LAZY)
    @MapsId
    private Customer customer;
}

CREATE SCHEMA IF NOT EXISTS CUSTOMERS;

CREATE TABLE CUSTOMERS.CUSTOMER
(
    customer_id BINARY(16) NOT NULL PRIMARY KEY,
) ENGINE = InnoDB;

CREATE TABLE CUSTOMERS.ADDRESS
(
    address_id BINARY(16) NOT NULL PRIMARY KEY,
) ENGINE = InnoDB;

ALTER table CUSTOMERS.ADDRESS
ADD CONSTRAINT fk_customer_address
FOREIGN KEY (address_id)
REFERENCES CUSTOMERS.CUSTOMER (customer_id);

@RunWith(SpringRunner.class)
@SpringBootTest
public class CustomerRepositoryIntegrationTest {

    @Autowired
    private CustomerRepository cut;

    @Test
        public void testSaveAndDeleteCustomer() {
            Address address = new Address();
            Customer customer = new Customer();
            customer.setAddress(address);

            cut.save(customer);

            Customer retrievedCustomer = cut.findAll().get(0);
            assertEquals(customer, retrievedCustomer);
        }
}

ERROR] testSaveAndDeleteCustomer(com.foxhound.customers.repositories.CustomerRepositoryIntegrationTest)  Time elapsed: 0.034 s  <<< ERROR!
org.springframework.orm.jpa.JpaSystemException: attempted to assign id from null one-to-one property [com.foxhound.customers.models.Address.customer]; nested exception is org.hibernate.id.IdentifierGenerationException: attempted to assign id from null one-to-one property [com.foxhound.customers.models.Address.customer]
    at com.foxhound.customers.repositories.CustomerRepositoryIntegrationTest.testSaveAndDeleteCustomer(CustomerRepositoryIntegrationTest.java:47)
Caused by: org.hibernate.id.IdentifierGenerationException: attempted to assign id from null one-to-one property [com.foxhound.customers.models.Address.customer]
    at com.foxhound.customers.repositories.CustomerRepositoryIntegrationTest.testSaveAndDeleteCustomer(CustomerRepositoryIntegrationTest.java:47)

数据库模型：

spring.datasource.url = jdbc:mysql://localhost:3306/customers?serverTimezone=UTC&useSSL=false&allowPublicKeyRetrieval=true&useSSL=false
spring.datasource.username = admin
spring.datasource.password = root

spring.jpa.database-platform = org.hibernate.dialect.MySQL5InnoDBDialect
spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5InnoDBDialect
spring.jpa.show-sql = true

@Getter
@Setter
@NoArgsConstructor
@Entity
@Table(name = "customer", schema = "customers")
public class Customer {

    @Id
    @GeneratedValue(generator = "uuid2")
    @GenericGenerator(name = "uuid2", strategy = "uuid2")
    @Column(name = "customer_id", columnDefinition = "BINARY(16)")
    private UUID customerId;

    @OneToOne(mappedBy = "customer", cascade = CascadeType.ALL)
    private Address address;
}

@Getter
@Setter
@NoArgsConstructor
@Entity
@Table(name = "address", schema = "customers")
public class Address {

    @Id
    @Column(name = "address_id", columnDefinition = "BINARY(16)")
    private UUID addressId;

    @OneToOne(fetch = FetchType.LAZY)
    @MapsId
    private Customer customer;
}

CREATE SCHEMA IF NOT EXISTS CUSTOMERS;

CREATE TABLE CUSTOMERS.CUSTOMER
(
    customer_id BINARY(16) NOT NULL PRIMARY KEY,
) ENGINE = InnoDB;

CREATE TABLE CUSTOMERS.ADDRESS
(
    address_id BINARY(16) NOT NULL PRIMARY KEY,
) ENGINE = InnoDB;

ALTER table CUSTOMERS.ADDRESS
ADD CONSTRAINT fk_customer_address
FOREIGN KEY (address_id)
REFERENCES CUSTOMERS.CUSTOMER (customer_id);

@RunWith(SpringRunner.class)
@SpringBootTest
public class CustomerRepositoryIntegrationTest {

    @Autowired
    private CustomerRepository cut;

    @Test
        public void testSaveAndDeleteCustomer() {
            Address address = new Address();
            Customer customer = new Customer();
            customer.setAddress(address);

            cut.save(customer);

            Customer retrievedCustomer = cut.findAll().get(0);
            assertEquals(customer, retrievedCustomer);
        }
}

ERROR] testSaveAndDeleteCustomer(com.foxhound.customers.repositories.CustomerRepositoryIntegrationTest)  Time elapsed: 0.034 s  <<< ERROR!
org.springframework.orm.jpa.JpaSystemException: attempted to assign id from null one-to-one property [com.foxhound.customers.models.Address.customer]; nested exception is org.hibernate.id.IdentifierGenerationException: attempted to assign id from null one-to-one property [com.foxhound.customers.models.Address.customer]
    at com.foxhound.customers.repositories.CustomerRepositoryIntegrationTest.testSaveAndDeleteCustomer(CustomerRepositoryIntegrationTest.java:47)
Caused by: org.hibernate.id.IdentifierGenerationException: attempted to assign id from null one-to-one property [com.foxhound.customers.models.Address.customer]
    at com.foxhound.customers.repositories.CustomerRepositoryIntegrationTest.testSaveAndDeleteCustomer(CustomerRepositoryIntegrationTest.java:47)

Flyway迁移文件：

spring.datasource.url = jdbc:mysql://localhost:3306/customers?serverTimezone=UTC&useSSL=false&allowPublicKeyRetrieval=true&useSSL=false
spring.datasource.username = admin
spring.datasource.password = root

spring.jpa.database-platform = org.hibernate.dialect.MySQL5InnoDBDialect
spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5InnoDBDialect
spring.jpa.show-sql = true

@Getter
@Setter
@NoArgsConstructor
@Entity
@Table(name = "customer", schema = "customers")
public class Customer {

    @Id
    @GeneratedValue(generator = "uuid2")
    @GenericGenerator(name = "uuid2", strategy = "uuid2")
    @Column(name = "customer_id", columnDefinition = "BINARY(16)")
    private UUID customerId;

    @OneToOne(mappedBy = "customer", cascade = CascadeType.ALL)
    private Address address;
}

@Getter
@Setter
@NoArgsConstructor
@Entity
@Table(name = "address", schema = "customers")
public class Address {

    @Id
    @Column(name = "address_id", columnDefinition = "BINARY(16)")
    private UUID addressId;

    @OneToOne(fetch = FetchType.LAZY)
    @MapsId
    private Customer customer;
}

CREATE SCHEMA IF NOT EXISTS CUSTOMERS;

CREATE TABLE CUSTOMERS.CUSTOMER
(
    customer_id BINARY(16) NOT NULL PRIMARY KEY,
) ENGINE = InnoDB;

CREATE TABLE CUSTOMERS.ADDRESS
(
    address_id BINARY(16) NOT NULL PRIMARY KEY,
) ENGINE = InnoDB;

ALTER table CUSTOMERS.ADDRESS
ADD CONSTRAINT fk_customer_address
FOREIGN KEY (address_id)
REFERENCES CUSTOMERS.CUSTOMER (customer_id);

@RunWith(SpringRunner.class)
@SpringBootTest
public class CustomerRepositoryIntegrationTest {

    @Autowired
    private CustomerRepository cut;

    @Test
        public void testSaveAndDeleteCustomer() {
            Address address = new Address();
            Customer customer = new Customer();
            customer.setAddress(address);

            cut.save(customer);

            Customer retrievedCustomer = cut.findAll().get(0);
            assertEquals(customer, retrievedCustomer);
        }
}

ERROR] testSaveAndDeleteCustomer(com.foxhound.customers.repositories.CustomerRepositoryIntegrationTest)  Time elapsed: 0.034 s  <<< ERROR!
org.springframework.orm.jpa.JpaSystemException: attempted to assign id from null one-to-one property [com.foxhound.customers.models.Address.customer]; nested exception is org.hibernate.id.IdentifierGenerationException: attempted to assign id from null one-to-one property [com.foxhound.customers.models.Address.customer]
    at com.foxhound.customers.repositories.CustomerRepositoryIntegrationTest.testSaveAndDeleteCustomer(CustomerRepositoryIntegrationTest.java:47)
Caused by: org.hibernate.id.IdentifierGenerationException: attempted to assign id from null one-to-one property [com.foxhound.customers.models.Address.customer]
    at com.foxhound.customers.repositories.CustomerRepositoryIntegrationTest.testSaveAndDeleteCustomer(CustomerRepositoryIntegrationTest.java:47)

集成测试：

spring.datasource.url = jdbc:mysql://localhost:3306/customers?serverTimezone=UTC&useSSL=false&allowPublicKeyRetrieval=true&useSSL=false
spring.datasource.username = admin
spring.datasource.password = root

spring.jpa.database-platform = org.hibernate.dialect.MySQL5InnoDBDialect
spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5InnoDBDialect
spring.jpa.show-sql = true

@Getter
@Setter
@NoArgsConstructor
@Entity
@Table(name = "customer", schema = "customers")
public class Customer {

    @Id
    @GeneratedValue(generator = "uuid2")
    @GenericGenerator(name = "uuid2", strategy = "uuid2")
    @Column(name = "customer_id", columnDefinition = "BINARY(16)")
    private UUID customerId;

    @OneToOne(mappedBy = "customer", cascade = CascadeType.ALL)
    private Address address;
}

@Getter
@Setter
@NoArgsConstructor
@Entity
@Table(name = "address", schema = "customers")
public class Address {

    @Id
    @Column(name = "address_id", columnDefinition = "BINARY(16)")
    private UUID addressId;

    @OneToOne(fetch = FetchType.LAZY)
    @MapsId
    private Customer customer;
}

CREATE SCHEMA IF NOT EXISTS CUSTOMERS;

CREATE TABLE CUSTOMERS.CUSTOMER
(
    customer_id BINARY(16) NOT NULL PRIMARY KEY,
) ENGINE = InnoDB;

CREATE TABLE CUSTOMERS.ADDRESS
(
    address_id BINARY(16) NOT NULL PRIMARY KEY,
) ENGINE = InnoDB;

ALTER table CUSTOMERS.ADDRESS
ADD CONSTRAINT fk_customer_address
FOREIGN KEY (address_id)
REFERENCES CUSTOMERS.CUSTOMER (customer_id);

@RunWith(SpringRunner.class)
@SpringBootTest
public class CustomerRepositoryIntegrationTest {

    @Autowired
    private CustomerRepository cut;

    @Test
        public void testSaveAndDeleteCustomer() {
            Address address = new Address();
            Customer customer = new Customer();
            customer.setAddress(address);

            cut.save(customer);

            Customer retrievedCustomer = cut.findAll().get(0);
            assertEquals(customer, retrievedCustomer);
        }
}

ERROR] testSaveAndDeleteCustomer(com.foxhound.customers.repositories.CustomerRepositoryIntegrationTest)  Time elapsed: 0.034 s  <<< ERROR!
org.springframework.orm.jpa.JpaSystemException: attempted to assign id from null one-to-one property [com.foxhound.customers.models.Address.customer]; nested exception is org.hibernate.id.IdentifierGenerationException: attempted to assign id from null one-to-one property [com.foxhound.customers.models.Address.customer]
    at com.foxhound.customers.repositories.CustomerRepositoryIntegrationTest.testSaveAndDeleteCustomer(CustomerRepositoryIntegrationTest.java:47)
Caused by: org.hibernate.id.IdentifierGenerationException: attempted to assign id from null one-to-one property [com.foxhound.customers.models.Address.customer]
    at com.foxhound.customers.repositories.CustomerRepositoryIntegrationTest.testSaveAndDeleteCustomer(CustomerRepositoryIntegrationTest.java:47)

错误：

spring.datasource.url = jdbc:mysql://localhost:3306/customers?serverTimezone=UTC&useSSL=false&allowPublicKeyRetrieval=true&useSSL=false
spring.datasource.username = admin
spring.datasource.password = root

spring.jpa.database-platform = org.hibernate.dialect.MySQL5InnoDBDialect
spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5InnoDBDialect
spring.jpa.show-sql = true

@Getter
@Setter
@NoArgsConstructor
@Entity
@Table(name = "customer", schema = "customers")
public class Customer {

    @Id
    @GeneratedValue(generator = "uuid2")
    @GenericGenerator(name = "uuid2", strategy = "uuid2")
    @Column(name = "customer_id", columnDefinition = "BINARY(16)")
    private UUID customerId;

    @OneToOne(mappedBy = "customer", cascade = CascadeType.ALL)
    private Address address;
}

@Getter
@Setter
@NoArgsConstructor
@Entity
@Table(name = "address", schema = "customers")
public class Address {

    @Id
    @Column(name = "address_id", columnDefinition = "BINARY(16)")
    private UUID addressId;

    @OneToOne(fetch = FetchType.LAZY)
    @MapsId
    private Customer customer;
}

CREATE SCHEMA IF NOT EXISTS CUSTOMERS;

CREATE TABLE CUSTOMERS.CUSTOMER
(
    customer_id BINARY(16) NOT NULL PRIMARY KEY,
) ENGINE = InnoDB;

CREATE TABLE CUSTOMERS.ADDRESS
(
    address_id BINARY(16) NOT NULL PRIMARY KEY,
) ENGINE = InnoDB;

ALTER table CUSTOMERS.ADDRESS
ADD CONSTRAINT fk_customer_address
FOREIGN KEY (address_id)
REFERENCES CUSTOMERS.CUSTOMER (customer_id);

@RunWith(SpringRunner.class)
@SpringBootTest
public class CustomerRepositoryIntegrationTest {

    @Autowired
    private CustomerRepository cut;

    @Test
        public void testSaveAndDeleteCustomer() {
            Address address = new Address();
            Customer customer = new Customer();
            customer.setAddress(address);

            cut.save(customer);

            Customer retrievedCustomer = cut.findAll().get(0);
            assertEquals(customer, retrievedCustomer);
        }
}

ERROR] testSaveAndDeleteCustomer(com.foxhound.customers.repositories.CustomerRepositoryIntegrationTest)  Time elapsed: 0.034 s  <<< ERROR!
org.springframework.orm.jpa.JpaSystemException: attempted to assign id from null one-to-one property [com.foxhound.customers.models.Address.customer]; nested exception is org.hibernate.id.IdentifierGenerationException: attempted to assign id from null one-to-one property [com.foxhound.customers.models.Address.customer]
    at com.foxhound.customers.repositories.CustomerRepositoryIntegrationTest.testSaveAndDeleteCustomer(CustomerRepositoryIntegrationTest.java:47)
Caused by: org.hibernate.id.IdentifierGenerationException: attempted to assign id from null one-to-one property [com.foxhound.customers.models.Address.customer]
    at com.foxhound.customers.repositories.CustomerRepositoryIntegrationTest.testSaveAndDeleteCustomer(CustomerRepositoryIntegrationTest.java:47)

---

ERROR]testsaveanddeletecuster（com.foxhound.customers.repositories.CustomerRepositoryIntegrationTest）经过的时间：0.034秒您不了解双向映射是如何工作的，所以需要仔细考虑一下。代码

@OneToOne(fetch = FetchType.LAZY)
@MapsId
private Customer customer;

在
地址中
使映射单向。通常，为了保存此信息，您需要设置
customer
字段并保存它

address.setCustomer(customer);        
addressRepo.save(address);

但是，您已经定义了双向映射并提供了级联注释

@OneToOne(mappedBy = "customer", cascade = CascadeType.ALL)
private Address address;

级联注释使您不必（在代码中）执行两个持久性操作，但这并不意味着您不必在address中设置customer字段。此外，正如您所注意到的，为了使级联操作正常工作，您需要设置customer的address字段

customer.setAddress(address);

因此，为了使代码正常工作，您需要将其更改为在地址中设置客户

Address address = new Address();
Customer customer = new Customer();
customer.setAddress(address);
address.setCustomer(customer);
customerRepo.save(customer);

使用双向映射，您必须管理关系的双方，或者以单向方式使用它进行持久化，以双向方式进行检索。如果您添加了一个级联注释，那么您还必须管理关系的两侧以实现持久化。
您好，这对我很有用！谢谢还有一个问题。我不得不将我的“地址\ id”栏改为“客户\客户\ id”，以使其正常工作。在“OneToOne”客户字段中，我无法使用“Column”注释来更改名称。有没有办法将该列命名为“address\u id”？干杯您好，JoseLara，您可以通过在@MapsId annotationYes下添加@JoinColumn（name=“customer\u id”）来重命名customer字段，正如@GorguiNdong所说的@JoinColumn（name=“address\u id”）。谢谢戈尔吉。也就是说，DBA将其命名为address\u id，而实际上它是客户id，这有点让人困惑。