ClassRoom.java package com.com;

import javax.persistence.Column; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.Id;

import org.hibernate.annotations.GenericGenerator;

@Entity public class ClassRoom { @Id @GeneratedValue(generator="cid") @GenericGenerator(name="cid",strategy="assigned") @Column(length=5) private String cid; private String cname;

public ClassRoom(){}public ClassRoom(String cid, String cname) {super();this.cid = cid;this.cname = cname;
}public String getCid() {return cid;
}public void setCid(String cid) {this.cid = cid;
}public String getCname() {return cname;
}public void setCname(String cname) {this.cname = cname;
}

}

Mao.java package com.com;

import javax.persistence.CascadeType; import javax.persistence.Entity; import javax.persistence.FetchType; import javax.persistence.Id; import javax.persistence.JoinColumn; import javax.persistence.ManyToOne;

@Entity public class Mao {

private int sid;
private String phone;
private String post;
private ClassRoom classroom;
@ManyToOne(cascade={CascadeType.ALL},fetch=FetchType.EAGER)
@JoinColumn(name="cid",referencedColumnName="CID")public ClassRoom getClassroom() {return classroom;
}public void setClassroom(ClassRoom classroom) {this.classroom = classroom;
}public Mao(){}public Mao(int sid, String phone, String post) {super();this.sid = sid;this.phone = phone;this.post = post;
}
@Id
public int getSid() {return sid;
}public void setSid(int sid) {this.sid = sid;
}public String getPhone() {return phone;
}public void setPhone(String phone) {this.phone = phone;
}public String getPost() {return post;
}public void setPost(String post) {this.post = post;
}

} Test.java package com.mao;

import org.hibernate.Session; import org.hibernate.SessionFactory; import org.hibernate.Transaction; import org.hibernate.cfg.Configuration; import org.hibernate.service.ServiceRegistry; import org.hibernate.service.ServiceRegistryBuilder; import org.hibernate.tool.hbm2ddl.SchemaExport;

public class Test { @org.junit.Test public void test(){ Configuration config=new Configuration().configure(); ServiceRegistry serviceRegistry=new ServiceRegistryBuilder().applySettings(config.getProperties()).buildServiceRegistry(); SessionFactory sessionFactory=config.buildSessionFactory(serviceRegistry); SchemaExport export=new SchemaExport(config); export.create(true,true); sessionFactory.close();

}

@org.junit.Test public void Add(){ Configuration config=new Configuration().configure(); ServiceRegistry serviceRegistry=new ServiceRegistryBuilder().applySettings(config.getProperties()).buildServiceRegistry(); SessionFactory sessionFactory=config.buildSessionFactory(serviceRegistry); Session session=sessionFactory.openSession(); Transaction tx=session.beginTransaction();

  tx.commit();session.close();sessionFactory.close();

} @org.junit.Test public void addd(){ Configuration config=new Configuration().configure(); ServiceRegistry serviceRegistry=new ServiceRegistryBuilder().applySettings(config.getProperties()).buildServiceRegistry(); SessionFactory sessionFactory=config.buildSessionFactory(serviceRegistry); SchemaExport export=new SchemaExport(config); export.create(true,true); sessionFactory.close();

} } 出现错误，多敲几次代码