为什么我使用session.openSession()得出来的连接对象的hashcode是相同的？我用的是hibernate5
萌萌哒猫头鹰
2016-06-30 22:08
package junit;
import java.sql.Connection;
import java.sql.SQLException;
import java.util.Date;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
import org.hibernate.jdbc.Work;
import org.junit.Test;
import com.model.Student;
public class SessionTest {
@Test
public void test1(){
Configuration configure = new Configuration().configure();
SessionFactory sessionFactory =configure.buildSessionFactory();
Session session = sessionFactory.openSession();
//System.out.println(session==session2);
Transaction trans=session.beginTransaction();
session.doWork(new Work() {
@Override
public void execute(Connection arg0) throws SQLException {
// TODO Auto-generated method stub
System.out.println(arg0.hashCode());
}
});
Student s = new Student(7, "kkk", new Date(), "上海");
session.save(s);
trans.commit();
Session session2 = sessionFactory.openSession();
trans=session2.beginTransaction();
session2.doWork(new Work() {
@Override
public void execute(Connection arg0) throws SQLException {
// TODO Auto-generated method stub
System.out.println(arg0.hashCode());
}
});
s = new Student(6, "111", new Date(), "上海");
session2.save(s);
trans.commit();
session.close();
session2.close();
}
}6回答
-
- 慕移动9181930
- 2022-03-29 04:51:29
-
- vwv
- 2016-11-30 17:18:03
理解是两个不同对象就好，估计你也使用的Java 8
-
- vwv
- 2016-11-30 17:17:00
hashCode方法是Object的方法 你是可以在任何子类里面复写的（java所有类均继承Object)，如果手动设置 return “1"那就会相同
-
- vwv
- 2016-11-30 17:15:56
我也使用的hibernate5也是这样子，刚刚查了下Java中两个不同对象的hashcode可能相同
connection hashcode:1968552224
Hibernate:
insert
into
student
(sname, gender, birthday, address, sid)
values
(?, ?, ?, ?, ?)
connection hashcode:1968552224
false
Hibernate:
insert
into
student
(sname, gender, birthday, address, sid)
values
(?, ?, ?, ?, ?)
-
- Coder编程
- 2016-08-01 16:26:45
因为你显示的关闭了session会话，如果你注释掉,hashcode值就会不一样了，这也就是老师一直在证明opensesion()为什么不会自动关闭session会话，getCurrentSession()能自动关闭session会话了。我在评论区有具体说明。你可以去看下
-
- 萌萌哒猫头鹰
- 2016-06-30 22:11:00
不小心按了一个截图按钮。
console输出是这个：
Hibernate:
drop table if exists STUDENT
Hibernate:
create table STUDENT (
SID integer not null,
SNAME varchar(255),
BIRTHDAY datetime,
ADDRESS varchar(255),
primary key (SID)
)
Jun 30, 2016 10:04:40 PM org.hibernate.tool.schema.internal.SchemaCreatorImpl applyImportSources
INFO: HHH000476: Executing import script 'org.hibernate.tool.schema.internal.exec.ScriptSourceInputNonExistentImpl@a7e2d9d'
1215029765
Hibernate:
insert
into
STUDENT
(SNAME, BIRTHDAY, ADDRESS, SID)
values
(?, ?, ?, ?)
1215029765
Hibernate:
insert
into
STUDENT
(SNAME, BIRTHDAY, ADDRESS, SID)
values
(?, ?, ?, ?)
Hibernate初探之单表映射
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