问题描述
最近在学着用anotation配置hibernate，结果发现一些诡异的情况……实体类：ackage com.yyz.beans;import javax.persistence.Entity;import javax.persistence.GeneratedValue;import javax.persistence.Id;import javax.persistence.JoinColumn;import javax.persistence.ManyToOne;import javax.persistence.Table;@Entity@Table(name = "score")public class Score {private int sId;private Course cou;private Student stu;private double score;@Id@GeneratedValuepublic int getsId() {return sId;}public void setsId(int sId) {this.sId = sId;}public Score(Student s1, Course c1, double i) {this.stu=s1;this.cou=c1;this.score=i;}@ManyToOne@JoinColumn(name = "course_id")public Course getCou() {return cou;}public void setCou(Course cou) {this.cou = cou;}@ManyToOne@JoinColumn(name = "student_id")public Student getStu() {return stu;}public void setStu(Student stu) {this.stu = stu;}public double getScore() {return score;}public void setScore(double score) {this.score = score;}}然后我让hibernate自动帮我生成表，结果它给我来了这么个建表语句：22:37:41,130 DEBUG SchemaExport:377 - create table score ( sId integer not null, score double precision not null, course_id integer, student_id integer not null auto_increment, primary key (student_id, course_id) )明显我指定的主键是sid，为什么生成的建表语句里course_id和student_id为联合主键呢？明显我设置了sid为自增长，为什么生成的建表语句里student_id成了自增长字段呢？ 问题补充：cuiran 写道
解决方案
你是不是还有其他的表和这个表有关系．单独的话 应该不会这样．