jsp Hibernate入門教程第1/3頁
更新時間:2008年11月14日 23:08:55 作者:
如果您是在同一個Session中取出數(shù)據(jù)并想要馬上進(jìn)行更新,則只要先查詢并取出對象,透過setXXX()方法設(shè)定好新的值,然后呼叫session.flush()即可在同一個Session中更新指定的數(shù)據(jù)
例如:
HibernateTest.java
import onlyfun.caterpillar.*;
import net.sf.hibernate.*;
import net.sf.hibernate.cfg.*;
import java.util.*;
public class HibernateTest {
public static void main(String[] args) throws HibernateException {
SessionFactory sessionFactory = new Configuration().configure().buildSessionFactory();
Session session = sessionFactory.openSession();
List users = session.find("from User");
User updated = null;
for (ListIterator iterator = users.listIterator(); iterator.hasNext(); ) {
User user = (User) iterator.next();
if(updated == null)
updated = user;
System.out.println(user.getName() +
"\n\tAge: " + user.getAge() +
"\n\tSex: " + user.getSex());
}
updated.setName("justin");
session.flush();
users = session.find("from User");
session.close();
sessionFactory.close();
for (ListIterator iterator = users.listIterator(); iterator.hasNext(); ) {
User user = (User) iterator.next();
System.out.println(user.getName() +
"\n\tAge: " + user.getAge() +
"\n\tSex: " + user.getSex());
}
}
}
這個程序會顯示數(shù)據(jù)表中的所有數(shù)據(jù),并將數(shù)據(jù)表中的第一筆數(shù)據(jù)更新,一個執(zhí)行的結(jié)果如下:
log4j:WARN No appenders could be found for logger (net.sf.hibernate.cfg.Environment).
log4j:WARN Please initialize the log4j system properly.
Hibernate: select user0_.user_id as user_id, user0_.name as name, user0_.sex as sex, user0_.age as age from USER user0_
caterpillar
Age: 28
Sex: M
momor
Age: 25
Sex: F
Bush
Age: 25
Sex: M
Becky
Age: 35
Sex: F
Hibernate: update USER set name=?, sex=?, age=? where user_id=?
Hibernate: select user0_.user_id as user_id, user0_.name as name, user0_.sex as sex, user0_.age as age from USER user0_
justin
Age: 28
Sex: M
momor
Age: 25
Sex: F
Bush
Age: 25
Sex: M
Becky
Age: 35
Sex: F
復(fù)制代碼 代碼如下:
HibernateTest.java
import onlyfun.caterpillar.*;
import net.sf.hibernate.*;
import net.sf.hibernate.cfg.*;
import java.util.*;
public class HibernateTest {
public static void main(String[] args) throws HibernateException {
SessionFactory sessionFactory = new Configuration().configure().buildSessionFactory();
Session session = sessionFactory.openSession();
List users = session.find("from User");
User updated = null;
for (ListIterator iterator = users.listIterator(); iterator.hasNext(); ) {
User user = (User) iterator.next();
if(updated == null)
updated = user;
System.out.println(user.getName() +
"\n\tAge: " + user.getAge() +
"\n\tSex: " + user.getSex());
}
updated.setName("justin");
session.flush();
users = session.find("from User");
session.close();
sessionFactory.close();
for (ListIterator iterator = users.listIterator(); iterator.hasNext(); ) {
User user = (User) iterator.next();
System.out.println(user.getName() +
"\n\tAge: " + user.getAge() +
"\n\tSex: " + user.getSex());
}
}
}
這個程序會顯示數(shù)據(jù)表中的所有數(shù)據(jù),并將數(shù)據(jù)表中的第一筆數(shù)據(jù)更新,一個執(zhí)行的結(jié)果如下:
log4j:WARN No appenders could be found for logger (net.sf.hibernate.cfg.Environment).
log4j:WARN Please initialize the log4j system properly.
Hibernate: select user0_.user_id as user_id, user0_.name as name, user0_.sex as sex, user0_.age as age from USER user0_
caterpillar
Age: 28
Sex: M
momor
Age: 25
Sex: F
Bush
Age: 25
Sex: M
Becky
Age: 35
Sex: F
Hibernate: update USER set name=?, sex=?, age=? where user_id=?
Hibernate: select user0_.user_id as user_id, user0_.name as name, user0_.sex as sex, user0_.age as age from USER user0_
justin
Age: 28
Sex: M
momor
Age: 25
Sex: F
Bush
Age: 25
Sex: M
Becky
Age: 35
Sex: F
相關(guān)文章
深入淺析Jsp中 out.print 和 out.write 的區(qū)別
本文簡明扼要的給大家介紹了jsp中 out.print 和 out.write 的區(qū)別,雖然本文簡短但是主要內(nèi)容給大家介紹清楚了,需要的朋友參考下吧2017-02-02asp.net getRemoteAddr()與 getRemoteHost()的區(qū)別
getRemoteAddr()與 getRemoteHost()的區(qū)別小結(jié),需要的朋友可以參考下。2009-12-12Spring mvc實現(xiàn)Restful返回json格式數(shù)據(jù)實例詳解
這篇文章主要介紹了Spring mvc實現(xiàn)Restful返回json格式數(shù)據(jù)實例詳解的相關(guān)資料,需要的朋友可以參考下2017-03-03jsp跳轉(zhuǎn)getRequestDispatcher()和sendRedirect()的區(qū)別
這篇文章主要介紹了jsp跳轉(zhuǎn)getRequestDispatcher()和sendRedirect()的區(qū)別,需要的朋友可以參考下2014-04-04基于javaweb+jsp實現(xiàn)學(xué)生宿舍管理系統(tǒng)
這篇文章主要介紹了基于javaweb+jsp實現(xiàn)的學(xué)生宿舍管理系統(tǒng)的示例代碼,文中的代碼介紹詳細(xì),對我們學(xué)習(xí)JSP有一定的幫助,需要的朋友可以參考一下2021-12-12