我需要在OneToOne和ManyToOne关系的一些JoinColumns上设置一个唯一约束，但是即使我在@JoinColumn注释中正确设置了名称，Hibernate也似乎找不到这些列。 这对我来说似乎很奇怪，因为同样的约束与Liquibase一起工作正常。
这是我的实体类：
package entities;
import org.hibernate.annotations.Cache;
import org.hibernate.annotations.CacheConcurrencyStrategy;
import javax.persistence.*;
import org.springframework.data.elasticsearch.annotations.Document;
import java.io.Serializable;
import java.util.Objects;
/**
* A MyAnswer.
*/
@Entity
@Table(name = "my_answer",
uniqueConstraints = @UniqueConstraint(columnNames = {"question_id, questionnaire_id", "user_id"})
)
@Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE)
@Document(indexName = "myanswer")
public class MyAnswer implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "sequenceGenerator")
@SequenceGenerator(name = "sequenceGenerator")
private Long id;
@Column(name = "mycheck")
private String mycheck;
@OneToOne
@JoinColumn
private Answer answer;
@OneToOne
@JoinColumn(name = "question_id")
private Question question;
@OneToOne
@JoinColumn(name = "questionnaire_id")
private Questionnaire questionnaire;
@ManyToOne
@JoinColumn(name = "user_id")
private User user;
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getMycheck() {
return mycheck;
}
public MyAnswer mycheck(String mycheck) {
this.mycheck = mycheck;
return this;
}
public void setMycheck(String mycheck) {
this.mycheck = mycheck;
}
public Answer getAnswer() {
return answer;
}
public MyAnswer answer(Answer answer) {
this.answer = answer;
return this;
}
public void setAnswer(Answer answer) {
this.answer = answer;
}
public Question getQuestion() {
return question;
}
public MyAnswer question(Question question) {
this.question = question;
return this;
}
public void setQuestion(Question question) {
this.question = question;
}
public Questionnaire getQuestionnaire() {
return questionnaire;
}
public MyAnswer questionnaire(Questionnaire questionnaire) {
this.questionnaire = questionnaire;
return this;
}
public void setQuestionnaire(Questionnaire questionnaire) {
this.questionnaire = questionnaire;
}
public User getUser() {
return user;
}
public MyAnswer user(User user) {
this.user = user;
return this;
}
public void setUser(User user) {
this.user = user;
}
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
MyAnswer myAnswer = (MyAnswer) o;
if (myAnswer.getId() == null || getId() == null) {
return false;
}
return Objects.equals(getId(), myAnswer.getId());
}
@Override
public int hashCode() {
return Objects.hashCode(getId());
}
@Override
public String toString() {
return "MyAnswer{" +
"id=" + getId() +
", mycheck='" + getMycheck() + "'" +
"}";
}
}
抛出的异常日志下面：
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in class path resource [org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaAutoConfiguration.class]: Invocation of init method failed; nested exception is org.hibernate.AnnotationException: Unable to create unique key constraint (question_id, questionnaire_id, user_id) on table my_answer: database column 'question_id, questionnaire_id' not found. Make sure that you use the correct column name which depends on the naming strategy in use (it may not be the same as the property name in the entity, especially for relational types)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1628)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:555)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1080)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:857)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:543)
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122)
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:693)
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:360)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:303)
at project.App.main(App.java:68)
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.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49)
Caused by: org.hibernate.AnnotationException: Unable to create unique key constraint (question_id, questionnaire_id, user_id) on table my_answer: database column 'question_id, questionnaire_id' not found. Make sure that you use the correct column name which depends on the naming strategy in use (it may not be the same as the property name in the entity, especially for relational types)
at org.hibernate.boot.internal.InFlightMetadataCollectorImpl.buildUniqueKeyFromColumnNames(InFlightMetadataCollectorImpl.java:2074)
at org.hibernate.boot.internal.InFlightMetadataCollectorImpl.buildUniqueKeyFromColumnNames(InFlightMetadataCollectorImpl.java:1935)
at org.hibernate.boot.internal.InFlightMetadataCollectorImpl.processUniqueConstraintHolders(InFlightMetadataCollectorImpl.java:1923)
at org.hibernate.boot.internal.InFlightMetadataCollectorImpl.processSecondPasses(InFlightMetadataCollectorImpl.java:1595)
at org.hibernate.boot.model.process.spi.MetadataBuildingProcess.complete(MetadataBuildingProcess.java:278)
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.metadata(EntityManagerFactoryBuilderImpl.java:858)
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:885)
at org.springframework.orm.jpa.vendor.SpringHibernateJpaPersistenceProvider.createContainerEntityManagerFactory(SpringHibernateJpaPersistenceProvider.java:60)
at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:360)
at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.buildNativeEntityManagerFactory(AbstractEntityManagerFactoryBean.java:382)
at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:371)
at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.afterPropertiesSet(LocalContainerEntityManagerFactoryBean.java:336)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1687)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1624)
... 19 common frames omitted
2018-05-15 17:25:20.943 WARN 16173 --- [neut-Executor-1] com.zaxxer.hikari.pool.ProxyConnection : HikariPool-1 - Connection org.postgresql.jdbc.PgConnection@669c1cb9 marked as broken because of SQLSTATE(08003), ErrorCode(0)
答案 0 :(得分：4)
你的约束声明是错误的。而不是
@UniqueConstraint(columnNames = {"question_id, questionnaire_id", "user_id"})
使用
@UniqueConstraint(columnNames = {"question_id", "questionnaire_id", "user_id"})
请注意引号的区别。对于3列约束，您需要一个3元素的String数组用于列名，但是您只有一个2元素的String数组，第一个元素是无效的列名引用。