java - Hibernate:奇怪的异常

Question

问题:我有一个具有 id 属性的简单实体，但无法保存它。

异常(exception):

Exception in thread "main" org.hibernate.exception.SQLGrammarException: could not execute statement
    at org.hibernate.exception.internal.SQLStateConversionDelegate.convert(SQLStateConversionDelegate.java:123)
    at ...
Caused by: org.postgresql.util.PSQLException: ERROR: syntax error at or near "User"
  Position: 13
    at org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:2103)
    at ...

代码:

@Entity
@Table(name = "User")
public class User {
    @Id
    @GeneratedValue
    private long userId;

    //getter & setter

    public static void main(String[] args) {
        Session session = HibernateUtil.getSessionFactory().openSession();
        session.beginTransaction();
        User user = new User();
        session.persist(user);
        session.getTransaction().commit();
        session.close();
    }
}

HQL:

Hibernate: create table User (userId int8 not null, primary key (userId))
Hibernate: create sequence hibernate_sequence
INFO: HHH000230: Schema export complete
Hibernate: select nextval ('hibernate_sequence')
Hibernate: insert into User (userId) values (?)
WARN: SQL Error: 0, SQLState: 42601
ERROR: ERROR: syntax error at or near "User"
  Position: 13

Answer 1

User 是许多数据库中的保留关键字。

您不应该这样命名您的表。

尝试:

@Entity
@Table(name = "MyUser")
public class User {
    @Id
    @GeneratedValue
    private long userId;