22 Hibernateマッピングファイル構成
3731 ワード
id
increment Hibernate , 。
indentity
squence Oracle
hilo ,Hibernate , , 。
uuid ,Hibernate , , string , 。
native identity squence hilo
assigned
select
foreigh
property
update ,
insert
formula , 。
lazy , 。
unique
not-null
index
unique-key , unique-key
length
prescision
Session , , , bs
, session 。
SessionFactory , SessionFactory, ;
SessionFactory , Hibernate 。
session
session.flush() , native ,
Hibernate sql , , 。
flush , 。
, , ,
, , 20 。
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01.for(int i=0;i<10000;i++){
02. s.save(user);
03. if(i%20 == 0){
04. s.flush();
05. s.clear();
06. }
07.}
for(int i=0;i<10000;i++){
s.save(user);
if(i%20 == 0){
s.flush();
s.clear();
}
}
。
StatelessSession session, 。 session 。
,Hibernate3.0 , 3.0 hql
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01.Query query = session.createQuery("update u set birthday = :bd from User as u");
02.query.executeUpdate();
Query query = session.createQuery("update u set birthday = :bd from User as u");
query.executeUpdate();
, 。
hql criteria
select art,user from Article art,User user where art.author.id = user.id and art.id = :id Object[],Objectp[0]:article,Object[1]:user。
get , get , hql 。
DetachedCriteria , 。
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01.static List dc(DetachedCriteria dc){
02. Session s = HibernateUtil.getSession();
03. Criteria c = dc.getExecutableCriteria)s_;
04. List rs = c.list();
05. s.close();
06. return rs;
07.}
static List dc(DetachedCriteria dc){
Session s = HibernateUtil.getSession();
Criteria c = dc.getExecutableCriteria)s_;
List rs = c.list();
s.close();
return rs;
}
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01.DetachedCriteria dc = DetachedCriteria.forClass(User.class);
02.String name = request.getParameter("name");
03.if(name != null){
04. dc.add(Restrictions.eq("name",name));
05.}
06.List users = dc(dc);
DetachedCriteria dc = DetachedCriteria.forClass(User.class);
String name = request.getParameter("name");
if(name != null){
dc.add(Restrictions.eq("name",name));
}
List users = dc(dc);
Criteria。
end!