首頁猿問 HQL查詢無法顯示

HQL查詢無法顯示

Java

好好認真學習 2017-03-28 22:37:14

hibernate-release-5.2.9.Finaljunit4.9mysql使用5.1.29package hibernate;import java.util.Date;import java.util.List;import org.hibernate.Query;import org.hibernate.Session;import org.hibernate.SessionFactory;import org.hibernate.Transaction;import org.hibernate.boot.registry.StandardServiceRegistryBuilder;import org.hibernate.cfg.Configuration;import org.hibernate.service.ServiceRegistry;import org.junit.After;import org.junit.Before;import org.junit.Test;public class StudentsTest { ? private SessionFactory sessionFactory; ? private Session session; ? private Transaction transaction; @Before public void init(){ //創(chuàng)建配置對象 Configuration config=new Configuration().configure(); config.addClass(Student.class); //創(chuàng)建服務注冊對象 ServiceRegistry serviceRegistry =new StandardServiceRegistryBuilder().applySettings(config.getProperties()).build(); //創(chuàng)建會話工廠對象 sessionFactory=config.buildSessionFactory(serviceRegistry); //會話對象 session=sessionFactory.openSession(); //開啟事物 transaction=session.beginTransaction(); } @After public void destroy(){ transaction.commit();//提交事物 session.close();//關閉會話 sessionFactory.close();//關閉會話工廠 } ?@Test? ? ? ? public void teststudent(){? ? ?String sql="from Student";? ? ?Query<Student> query=session.createQuery(sql);? ? ?? ? ?List<Student> stu=query.list();? ? ?? ? ?for(Student s:stu)? ? ?{? ? ?System.out.println("name"+stu);? ? ?? ? ?}? ? ???? ? ? }

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1 回答

堯叔

TA貢獻77條經驗獲得超201個贊

重寫Student 的toString()方法，然后這樣寫

for(Student?s:stu)
?????{
?????System.out.println("name"+stu.toString());
?????}

謝謝采納！

1 反對回復 2017-03-28

好好認真學習
package hibernate; import java.util.Date; public class Student { private int sid; private String sname; private String gender; private Date birthday; private String address; public Student(int sid,String sname,String gender,Date birthday,String address){ this.sid=sid; this.sname=sname; this.gender=gender; this.birthday=birthday; this.address=address; } public Student(){ } @Override public String toString() { return "Student [sid=" + sid + ", sname=" + sname + ", gender=" + gender + ", birthday=" + birthday + ", address=" + address + "]"; } } toString要怎么寫額

回復 2017-03-29
堯叔
@Override public String toString() { return "Student [sid=" + sid + ", sname=" + sname + ", gender=" + gender + ", birthday=" + birthday + ", address=" + address + "]"; } 這不就是么你不都已經重寫了 for(Student s:stu) { System.out.println("name"+stu.toString()); }

回復 2017-03-29
堯叔
用toString()方法打印信息你直接打印對象你當然看不懂

回復 2017-03-29