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//一方
@Entity
@Table(name="test_classinfo")
public class ClassInfo {
@Id
@SequenceGenerator(name="seqClassInfo",sequenceName="seq_test_classinfo")
@GeneratedValue(generator="seqClassInfo")
private Integer cid;
private String cname;
@OneToMany(mappedBy="classInfo")//mappedBy:有二个作用:1.放弃创建中间表 2.放弃维护外键关系
// 在这里如果没有(mappedBy="classInfo"),会自动生成一个莫名其妙的表
private Set<Students> students;
set,get方法省略
}
//多方
@Entity
@Table(name="test_student")
public class Students {
@Id
@SequenceGenerator(name="seqStudents",sequenceName="seq_test_student")
@GeneratedValue(generator="seqStudents")
private Integer sid;
private String sname;
@ManyToOne(cascade=CascadeType.ALL)
@JoinColumn(name="cid")
private ClassInfo classInfo;
set,get方法省略
}
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原文地址:http://www.cnblogs.com/hwgok/p/5380146.html