Calculating Differnece between 2 dates in minutes

select  round((second_date - first_date) * (60 * 24),2) as time_in_minutes
from
  (
    select
    to_date('02/21/2013 01:30:00 PM','mm/dd/yyyy hh:mi:ss am') as first_date
   ,to_date('02/22/2013 01:30:00 PM','mm/dd/yyyy HH:MI:SS AM') as second_date
  from
    dual
  ) dual

Installing Windows7/Windows8 From Removable Media

Below are the steps you must follow when you want to install windows7 from USB stick:

After completing all the process your removable media will look like this

Prerequisites:

1.USB Flash Drive (Minimum 4GB)

2.Windows 7 or Windows 8 installation files.

Step1:Plug-in your USB flash drive to USB port and move all the contents from USB drive to a safe location on your system.
     Reason:Here we need to format the drive,as a result you may loose your data which is currently present in your removable media

Step2: Open Command Prompt with admin rights. Use any of the below methods to open Command Prompt with admin rights.

 -------Type cmd in Start menu search box and hit Ctrl+ Shift+ Enter.

or 

--------Press windows logo+R and then type cmd and hit enter (Note :You must be logged in as ADMIN )

Step3:Type  DISKPART and hit enter

Step4:Type LIST DISK command and note down the Disk number (ex: Disk 1) of your USB flash drive. In the below screenshot my Flash Drive Disk no is Disk 1.

Step5: Next type all the below commands one by one. Here I assume that your disk drive no is “Disk 1”.If you have Disk 2 as your USB flash drive then use Disk 2.Refer the  Step4 to confirm it.

So below are the commands you need to type and execute one by one:

SELECT DISK 1

CLEAN

CREATE PARTITION PRIMARY

SELECT PARTITION 1

ACTIVE

FORMAT FS=NTFS

(Format process may take few seconds)

ASSIGN

EXIT

Complete Screenshot is shown below:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

   
Step6:Open another command promt

Step7:Insert your Windows7 media into your Optical Drive
 and check the drive letter of the DVD drive. In this guide I will assume that your DVD drive letter is “D” and USB drive letter is “H” (open my computer to know about it).

Step8: Type D:   and hit enter
Step9:Type CD BOOT and hit enter

Where “D” is your DVD drive letter and Boot is the Directory name

Step10: Type BOOTSECT.EXE /NT60 H:

---->To update the USB drive with BOOTMGR compatible code.

Now Your removable  Media is ready to Boot

Step10: Copy your Windows 7 or Windows 8 DVD contents to the USB flash drive.

Step11:Your USB drive is ready to boot and install Windows 7 or Windows 8. Only thing you need to change the boot priority at the BIOS to USB from the HDD or CD Drive

Creating EO without WHO column in OAF

As per java standards, any class which extends an abstract class, must implement the abstract methods of the parent class or should be declared abstract itslef.
So Your child class must implement theses methods which is show as below

First:import theses package
 
import oracle.jbo.domain.Date;
import oracle.jbo.domain.Number; 

Then implement these metods

public  void setCreationDate(Date date){}

public  void setCreatedBy(Number number){}

public  void setLastUpdateDate(Date date){}

public  void setLastUpdatedBy(Number number){}

public   void setLastUpdateLogin(Number number){}

All System Date Function

A. Get the Current System Date and Time

SELECT SYSDATETIME()
    ,SYSDATETIMEOFFSET()
    ,SYSUTCDATETIME()
    ,CURRENT_TIMESTAMP
    ,GETDATE()
    ,GETUTCDATE();
/* Returned:
SYSDATETIME()      2007-04-30 13:10:02.0474381
SYSDATETIMEOFFSET()2007-04-30 13:10:02.0474381 -07:00
SYSUTCDATETIME()   2007-04-30 20:10:02.0474381
CURRENT_TIMESTAMP  2007-04-30 13:10:02.047
GETDATE()          2007-04-30 13:10:02.047
GETUTCDATE()       2007-04-30 20:10:02.047

B. Get the Current System Date

SELECT CONVERT (date, SYSDATETIME())
    ,CONVERT (date, SYSDATETIMEOFFSET())
    ,CONVERT (date, SYSUTCDATETIME())
    ,CONVERT (date, CURRENT_TIMESTAMP)
    ,CONVERT (date, GETDATE())
    ,CONVERT (date, GETUTCDATE());

/* Returned 
SYSDATETIME()      2007-05-03
SYSDATETIMEOFFSET()2007-05-03
SYSUTCDATETIME()   2007-05-04
CURRENT_TIMESTAMP  2007-05-03
GETDATE()          2007-05-03
GETUTCDATE()       2007-05-04
*/

C. Get the Current System Time

SELECT CONVERT (time, SYSDATETIME())
    ,CONVERT (time, SYSDATETIMEOFFSET())
    ,CONVERT (time, SYSUTCDATETIME())
    ,CONVERT (time, CURRENT_TIMESTAMP)
    ,CONVERT (time, GETDATE())
    ,CONVERT (time, GETUTCDATE());

/* Returned
SYSDATETIME()      13:18:45.3490361
SYSDATETIMEOFFSET()13:18:45.3490361
SYSUTCDATETIME()   20:18:45.3490361
CURRENT_TIMESTAMP  13:18:45.3470000
GETDATE()          13:18:45.3470000
GETUTCDATE()       20:18:45.3470000
*/

Query to get the Time in YYYY format

SELECT TO_CHAR(SYSDATE,'YYYY/MM/DD HH24:MI:SS') FROM DUAL
-->To get the time in 24hr 

SELECT TO_CHAR(SYSDATE,'YYYY/MM/DD HH12:MI:SS') FROM DUAL
--> To get the time in 12hr

JDeveloper(OAF) Architecure

Model will take care the Data Base related Transactions, Model contains the following:

• Entity Object (EO)
• View Object (VO)
• Callable Statement (PL/SQL Statement)
• Prepare Statement (Single Select Statement)
• OADB Transactions (Oracle Apps Data Base Transactions)

View is nothing but the OAF Page Output. View is implemented by UIX (User Interface XML).

Controller will take care of web browser activities like HTTP Get and HTTP Post
Controller have got three methods:

• Process Request
• Process Forms Request (HTTP Get)
• Process Form Data (HTTP Post)

HTTP get: While loading the Page we use HTTP Get.
HTTP Post : After Loading the page if we want any changes the we use HTTP Post.
We will discuss in detail about MVC architecture in the next chapters.
The Below figure shows the interaction between Model, View, and Controller.