我有 org.postgresql.util.PSQLException：錯誤：關系“角色”不存在，我不知道為什么。
物體類
package com.example.SpringBootTest1.model;
import lombok.*;
import javax.persistence.*;
@ToString
@AllArgsConstructor
@NoArgsConstructor
@Entity
@Table(name = "roles")
public class Role
{
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
@Setter
@Getter
private int id;
@Setter
@Getter
@Column(name = "name")
private String name;
}
main()
public static void main(String[] args)
{
EntityManagerFactory entityManagerFactory = Persistence.createEntityManagerFactory("role_pu");
EntityManager entityManager = entityManagerFactory.createEntityManager();
EntityTransaction entityTransaction = entityManager.getTransaction();
entityTransaction.begin();
Role role1 = new Role();
role1.setName("role111");
entityManager.persist(role1);
entityManager.getTransaction().commit();
entityManagerFactory.close();
entityManager.close();
}
資源/META-INF/persistence.xml
<persistence xmlns="http://java.sun.com/xml/ns/persistence" version="2.0">
<persistence-unit name="role_pu" transaction-type="RESOURCE_LOCAL">
<provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
<class>com.example.SpringBootTest1.model.Role</class>
<properties>
<property name="javax.persistence.jdbc.url" value="jdbc:postgresql://localhost:5432/postgres"/>
<property name="javax.persistence.jdbc.driver" value="org.postgresql.Driver"/>
<property name="javax.persistence.jdbc.user" value="postgres"/>
<property name="javax.persistence.jdbc.password" value="123"/>
<property name="dialect" value="org.hibernate.dialect.PostgreSQL94Dialect"/>
<property name="show_sql" value="true"/>
<property name="hibernate.format_sql" value="true"/>
<property name="hdm2ddl.auto" value="create"/>
</properties>
</persistence-unit>
</persistence>
在pom.xml我有
hibernate-core
postgresql
lombok
那么為什么我有這樣的錯誤，為什么會這樣？我已經閱讀了這個問題，但它對我沒有幫助。
uj5u.com熱心網友回復：
在現代 Hibernate 版本中，該屬性hdm2ddl.auto應該是hibernate.hbm2ddl.autoor javax.persistence.schema-generation.database.action。
https://docs.jboss.org/hibernate/stable/orm/userguide/html_single/Hibernate_User_Guide.html#configurations-hbmddl
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