Spring实体的关系不存在

Question

import javax.persistence.*;

    @Table(name = "users")
    @Entity
    public class User {
    
        @Id
        @GeneratedValue(strategy = GenerationType.AUTO)
        @Column(name = "userID")
        private long userID;
    }
        
    @Table(name = "subscriptions")
    @Entity
    public class Subscription {
    
        @Id
        @GeneratedValue(strategy = GenerationType.AUTO)
        @Column(name = "subscriptionID")
        private long subscriptionID;
    
        @ManyToOne
        @JoinColumn(name="userID")
        private User user;
    
    }

此代码崩溃：

原因：组织。postgresql。util。PSQLException：错误：关系“订阅”不存在

spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.PostgreSQLDialect

Springjpa。数据库平台=组织。冬眠地方话PostgreSQL10方言Spring。jpa。冬眠ddl auto=创建拖放

Spring数据源。驱动程序类名=组织。postgresql。驾驶员

代码适用于

 import javax.persistence.*;
    
        @Table(name = "users")
        @Entity
        public class User {
        
            @Id
            @GeneratedValue(strategy = GenerationType.AUTO)
            @Column(name = "userID")
            private long userID;
        }
            
        @Table(name = "subscriptions")
        @Entity
        public class Subscription {
        
            @Id
            @GeneratedValue(strategy = GenerationType.AUTO)
            @Column(name = "subscriptionID")
            private long subscriptionID;
        
        }

我怎么能修好它？

Answer 1

只需使用spring.jpa.hibernate.ddl-自动=更新而不是创建-删除