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Declare Global variables [message #238758]

Sat, 19 May 2007 17:00

dryinego
Messages: 16
Registered: May 2007

Junior Member

Hi,
Can you tell me how to declare and use global variables.
Thanks

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Re: Declare Global variables [message #238819 is a reply to message #238758]

Sun, 20 May 2007 03:31

Littlefoot
Messages: 21818
Registered: June 2005
Location: Croatia, Europe

Senior Member
Account Moderator

Is there a reason why you don't want to read about global variables in always accessible Forms Online Help system? While in Forms Builder, select "Help - Online Help ..." menu and search for any term you'd want to know more about.

Global variables can be declared in several ways; one of them is usual

:global.my_var_1 := 'abc';

. Another one is using the DEFAULT_VALUE built-in:

DEFAULT_VALUE('1234', 'global.my_var_2');

Note that global variables are always of a CHARACTER data type; you can store numbers into them, but then don't forget to use the TO_NUMBER function if necessary.

Reference them by preceding their name with a colon and the 'global' keyword, such as

IF :global.student_id = 'MV332' THEN ...

Referencing a non-initialized global variable causes an error.

Delete their value using the ERASE built-in:

ERASE('global.my_var_1');

This is necessary if you don't want to accidentally use its value (because global variable holds its value during the whole session, so you can use it in all forms/reports during that session).

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Re: Declare Global variables [message #238853 is a reply to message #238819]

Sun, 20 May 2007 10:13

dryinego
Messages: 16
Registered: May 2007

Junior Member

Okie ...Thanks a ton...

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