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我正在编写一个 spring-boot、spring-mvc 应用程序。其中有两个实体:User 和 Task。该任务必须属于用户。我正在尝试使用外键、使用 @OneToMany、@ManyToOne 和 @JoinColumn 来执行此操作。
用户.java:
package ru.chausov.to_do_list.data_base.entities;
import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;
import ru.chausov.to_do_list.data_base.types.Gender;
import javax.persistence.*;
import java.time.LocalDate;
import java.util.HashSet;
import java.util.Set;
@Data
@Builder
@Entity
@Table(name="users")
@NoArgsConstructor
@AllArgsConstructor
public class User {
@Id
@GeneratedValue
private Long id;
private String name;
private String lastName;
private LocalDate birthDate;
private Gender gender;
private String address;
private String company;
@OneToMany(mappedBy = "id", cascade = CascadeType.ALL, orphanRemoval = true)
private final Set<Task> tasks = new HashSet<>();
}
任务.java:
package ru.chausov.to_do_list.data_base.entities;
import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;
import javax.persistence.*;
import java.time.LocalDateTime;
@Data
@Builder
@Entity
@Table(name="tasks")
@NoArgsConstructor
@AllArgsConstructor
public class Task {
@Id
@GeneratedValue
private Long id;
private String name;
private String description;
private LocalDateTime receivedDate;
private LocalDateTime toBeDone;
private boolean done;
@ManyToOne
@JoinColumn(name = "user_id")
private User user;
}
从 CrudRepository 扩展了标准存储库。
UsersRepositpry.java:
package ru.chausov.to_do_list.data_base.repositories;
import org.springframework.data.repository.CrudRepository;
import ru.chausov.to_do_list.data_base.entities.User;
public interface UsersRepository extends CrudRepository<User, Long> {
}
TasksRepository.java:
package ru.chausov.to_do_list.data_base.repositories;
import org.springframework.data.repository.CrudRepository;
import ru.chausov.to_do_list.data_base.entities.Task;
public interface TasksRepository extends CrudRepository<Task, Long> {
}
编写了 junit/spring-boot 测试。
UserRepositoryTest.java:
package ru.chausov.to_do_list.data_base.repositories;
import org.junit.Assert;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
import ru.chausov.to_do_list.data_base.entities.Task;
import ru.chausov.to_do_list.data_base.entities.User;
@RunWith(SpringRunner.class)
@SpringBootTest
public class TasksRepositoryTests {
@Autowired
private TasksRepository tasksRepository;
@Autowired
private UsersRepository usersRepository;
@Test
public void saveTest() {
User user = new User();
usersRepository.save(user);
Task taskToSave = Task.builder().user(user).build();
Task savedTask = tasksRepository.save(taskToSave);
Assert.assertEquals(savedTask, taskToSave);
}
当我启动测试时,出现错误:
org.springframework.dao.DataIntegrityViolationException: could not execute statement; SQL [n/a]; constraint ["FKO4W1P8Y0P6E0GSR7VHBDG76KO: PUBLIC.TASKS FOREIGN KEY(ID) REFERENCES PUBLIC.USERS(ID) (2)"; SQL statement:
insert into tasks (description, done, name, received_date, to_be_done, user_id, id) values (?, ?, ?, ?, ?, ?, ?) [23506-197]]; nested exception is org.hibernate.exception.ConstraintViolationException: could not execute statement
at org.springframework.orm.jpa.vendor.HibernateJpaDialect.convertHibernateAccessException(HibernateJpaDialect.java:296)
at org.springframework.orm.jpa.vendor.HibernateJpaDialect.translateExceptionIfPossible(HibernateJpaDialect.java:253)
at org.springframework.orm.jpa.JpaTransactionManager.doCommit(JpaTransactionManager.java:536)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.processCommit(AbstractPlatformTransactionManager.java:746)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:714)
at org.springframework.transaction.interceptor.TransactionAspectSupport.commitTransactionAfterReturning(TransactionAspectSupport.java:533)
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:304)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:98)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:139)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.data.jpa.repository.support.CrudMethodMetadataPostProcessor$CrudMethodMetadataPopulatingMethodInterceptor.invoke(CrudMethodMetadataPostProcessor.java:138)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:93)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.data.repository.core.support.SurroundingTransactionDetectorMethodInterceptor.invoke(SurroundingTransactionDetectorMethodInterceptor.java:61)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:212)
at com.sun.proxy.$Proxy97.save(Unknown Source)
at ru.chausov.to_do_list.data_base.repositories.TasksRepositoryTests.saveTest(TasksRepositoryTests.java:29)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.springframework.test.context.junit4.statements.RunBeforeTestExecutionCallbacks.evaluate(RunBeforeTestExecutionCallbacks.java:74)
at org.springframework.test.context.junit4.statements.RunAfterTestExecutionCallbacks.evaluate(RunAfterTestExecutionCallbacks.java:84)
at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:75)
at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:86)
at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:84)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:251)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:97)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:190)
at org.junit.runners.Suite.runChild(Suite.java:128)
at org.junit.runners.Suite.runChild(Suite.java:27)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
Caused by: org.hibernate.exception.ConstraintViolationException: could not execute statement
at org.hibernate.exception.internal.SQLStateConversionDelegate.convert(SQLStateConversionDelegate.java:112)
at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:42)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:113)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:99)
at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:178)
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3174)
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3688)
at org.hibernate.action.internal.EntityInsertAction.execute(EntityInsertAction.java:90)
at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:604)
at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:478)
at org.hibernate.event.internal.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:356)
at org.hibernate.event.internal.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:39)
at org.hibernate.internal.SessionImpl.doFlush(SessionImpl.java:1453)
at org.hibernate.internal.SessionImpl.managedFlush(SessionImpl.java:510)
at org.hibernate.internal.SessionImpl.flushBeforeTransactionCompletion(SessionImpl.java:3282)
at org.hibernate.internal.SessionImpl.beforeTransactionCompletion(SessionImpl.java:2478)
at org.hibernate.engine.jdbc.internal.JdbcCoordinatorImpl.beforeTransactionCompletion(JdbcCoordinatorImpl.java:473)
at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl.beforeCompletionCallback(JdbcResourceLocalTransactionCoordinatorImpl.java:178)
at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl.access$300(JdbcResourceLocalTransactionCoordinatorImpl.java:39)
at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl$TransactionDriverControlImpl.commit(JdbcResourceLocalTransactionCoordinatorImpl.java:271)
at org.hibernate.engine.transaction.internal.TransactionImpl.commit(TransactionImpl.java:104)
at org.springframework.orm.jpa.JpaTransactionManager.doCommit(JpaTransactionManager.java:532)
... 55 more
Caused by: org.h2.jdbc.JdbcSQLException: Нарушение ссылочной целостности: "FKO4W1P8Y0P6E0GSR7VHBDG76KO: PUBLIC.TASKS FOREIGN KEY(ID) REFERENCES PUBLIC.USERS(ID) (2)"
Referential integrity constraint violation: "FKO4W1P8Y0P6E0GSR7VHBDG76KO: PUBLIC.TASKS FOREIGN KEY(ID) REFERENCES PUBLIC.USERS(ID) (2)"; SQL statement:
insert into tasks (description, done, name, received_date, to_be_done, user_id, id) values (?, ?, ?, ?, ?, ?, ?) [23506-197]
at org.h2.message.DbException.getJdbcSQLException(DbException.java:357)
at org.h2.message.DbException.get(DbException.java:179)
at org.h2.message.DbException.get(DbException.java:155)
at org.h2.constraint.ConstraintReferential.checkRowOwnTable(ConstraintReferential.java:332)
at org.h2.constraint.ConstraintReferential.checkRow(ConstraintReferential.java:274)
at org.h2.table.Table.fireConstraints(Table.java:995)
at org.h2.table.Table.fireAfterRow(Table.java:1013)
at org.h2.command.dml.Insert.insertRows(Insert.java:192)
at org.h2.command.dml.Insert.update(Insert.java:134)
at org.h2.command.CommandContainer.update(CommandContainer.java:102)
at org.h2.command.Command.executeUpdate(Command.java:261)
at org.h2.jdbc.JdbcPreparedStatement.executeUpdateInternal(JdbcPreparedStatement.java:199)
at org.h2.jdbc.JdbcPreparedStatement.executeUpdate(JdbcPreparedStatement.java:153)
at com.zaxxer.hikari.pool.ProxyPreparedStatement.executeUpdate(ProxyPreparedStatement.java:61)
at com.zaxxer.hikari.pool.HikariProxyPreparedStatement.executeUpdate(HikariProxyPreparedStatement.java)
at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:175)
... 72 more
据我了解,该错误是由于外键 user_id 为 null 引起的。
我应该如何初始化user_id?
最佳答案
您需要使用您还保存的Task
填写User
上的@OneToMany
集:
@Test
public void saveTest() {
User user = new User();
usersRepository.save(user);
Task taskToSave = Task.builder().user(user).build();
user.getTasks().add(task); // -> Add this
Task savedTask = tasksRepository.save(taskToSave);
Assert.assertEquals(savedTask, taskToSave);
}
这是因为它们处于双向映射中。
关于java - @JoinColumn,如何初始化它?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/56539287/
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