多的一方加外键
package hibernate002test.copy;
import java.util.HashSet;
import java.util.Set;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.OneToMany;
@Entity
public class Groups {
private int id;
private String name;
private Set user = new HashSet();
@Id
@GeneratedValue
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
@OneToMany
@Column(name = "groupid")
public Set<User> getUser() {
return user;
}
public void setUser(Set<User> user) {
this.user = user;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
package hibernate002test.copy;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
@Entity
public class User {
private int userid;
private String username;
@Id
@GeneratedValue
public int getUserid() {
return userid;
}
public void setUserid(int userid) {
this.userid = userid;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
}
package datatest;
import org.hibernate.cfg.AnnotationConfiguration;
import org.hibernate.tool.hbm2ddl.SchemaExport;
/**
* 在一对一双向关联时要使用例如:@OneToOne(mappedBy=”wife”)
* @author Lenovo
*
*/
public class Test {
@org.junit.Test
public void test() {
new SchemaExport(new AnnotationConfiguration().configure()).create(false,true);
}
}