小编las*_*olm的帖子

我正在开发一个应用程序,通过Hibernate框架访问运行SQL Server 2012的数据库.但是,我无法弄清楚如何使SequenceGenerator注释的实例工作; 每当我尝试将新对象实例保存到数据库表时,我都会收到异常.要保存的类如下:

import java.io.Serializable;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.SequenceGenerator;
import javax.persistence.Table;

@Entity
@Table(name="MESSAGES")
public class Message implements Serializable {

    private static final long serialVersionUID = -3535373804021266134L;

    @Id
    @Column(name="MESSAGE_ID")
    @GeneratedValue(strategy=GenerationType.SEQUENCE, generator="MESSAGE_GEN")
    @SequenceGenerator(name="MESSAGE_GEN", sequenceName="MESSAGE_SEQ", initialValue=1, allocationSize=1) 
    private Long id;

    @Column(name="TEXT")
    private String text;

    public Message(String text) { 
        this.text = text;
    }

    public Long getId() {
        return id;
    }

    public String getText() {
        return text;
    }

}

一个引起问题的情况可能是以下交易:

import org.hibernate.Session;

public class Manager { …