maniacdown-CSDN博客

原创 C++ -- dynamic_cast

class Widget { };class SpecialWidget: public Widget { };void update(SpecialWidget *psw);int main(){ Widget *pw = new SpecialWidget; update(dynamic_castSpecialWidget*>(pw));

2007-09-05 14:24:00 455

原创 Java persistence with hibernate concept 5 -- Class mapping options

-------------------------------------------------------------------------------------------------------------Class mapping optionsIf you check the and elements in the DTD (or thereference docume

2007-08-27 13:20:00 563

原创 Java persistence with hibernate concept 4 -- Database primary keys

-----------------------------------------------------------------------------------------------------------Database primary keys Selecting a primary keyThe candidate key is a column or set of co

2007-08-27 13:11:00 476

原创 Java persistence with hibernate concept 3 -- Mapping entities with identity

----------------------------------------------------------------------------------------------------------------Understanding Java identity and equality:Along with Java identity (memory location

2007-08-27 11:33:00 574

原创 Java persistence with hibernate concept 2 -- Entity type , Value type

We advocate a design with more classes than tables: One row represents multiple instances. Because database identity is implemented by primary key value, some persistent objects won’t have their own i

2007-08-27 10:52:00 469

原创 oracle tip 1 -- rownum, row_number()

what if you wanted to get the “top” rows from an ordered result set? You would think the following query would work: SELECT ROWNUM, ENAME, SAL FROM SCOTT.EMP WHERE ROWNUM 6 ORDER BY SAL DESC;

2007-08-23 09:54:00 497

原创 Java Persistence with Hibernate concept 1 -- automatic dirty checking, cascading save. transactional write-behind

// Third unit of workSession thirdSession =HibernateUtil.getSessionFactory().openSession();Transaction thirdTransaction = thirdSession.beginTransaction();// msgId holds the identifier value of the f

2007-08-22 09:25:00 755

HTML.5.24.Hour.Trainer.chm

HTML.5.24.Hour.Trainer.chmHTML.5.24.Hour.Trainer.chmHTML.5.24.Hour.Trainer.chmHTML.5.24.Hour.Trainer.chmHTML.5.24.Hour.Trainer.chm

2011-05-17

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