Oracle Forms 4.5/ 5.0/ 6.0 FAQ
$Date: 29-Jan-2000 $
$Revision: 1.31c $
$Author: Frank Naudé $
Topics
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How does one iterate through items in a specified block?
Code example:
OriPos := TO_NUMBER(:System.Trigger_Record);
First_Record;
LOOP
-- do processing
IF (:System.Last_Record = 'TRUE') THEN
Go_Record(OriPos);
EXIT;
ELSE
Next_Record;
END IF;
END LOOP
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Can on bypass the Oracle login screen?
The first thing that the user sees when using runform is the Oracle logon prompt
asking them for their username, password, and database to connect to.
You can bypass this screen or customise it by displaying your own
logon screen. Eg:
ON-LOGIN
declare
uname varchar2(10);
pass varchar2(10);
begin
uname := 'username';
pass :='password';
logon(uname, pass||'@connect_database');
end;
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Can one Maximize/ Minimize a Window in Forms?
On MS-Windows, Forms run inside a Windows Multiple-Document Interface (MDI)
window. You can use SET_WINDOW_PROPERTY on the window called FORMS_MDI_WINDOW
to resize this MDI (or any other named) window. Examples:
set_window_property(FORMS_MDI_WINDOW, WINDOW_STATE, MINIMIZE);
set_window_property(FORMS_MDI_WINDOW, POSITION, 7, 15);
set_window_property('my_window_name', WINDOW_STATE, MAXIMIZE);
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Can one issue DDL statements from Forms?
DDL (Data Definition Language) commands like CREATE, DROP and ALTER are not
directly supported from Forms because your Forms are not suppose to manipulate
the database structure.
A statement like CREATE TABLE X (A DATE);
will result in error:
Encountered the symbol "CREATE" which is a reserved word.
However, you can use the FORMS_DDL built-in to execute DDL statements. Eg:
FORMS_DDL('CREATE TABLE X (A DATE)');
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Can one execute dynamic SQL from Forms?
Yes, use the FORMS_DDL built-in or call the DBMS_SQL database package from Forms. Eg:
FORMS_DDL('INSERT INTO X VALUES (' || col_list || ')');
Just note that FORMS_DDL will force an implicit COMMIT and may de-synchronize the Oracle Forms COMMIT mechanism.
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Forms won't allow me to use restricted built-in's. What should I do?
How to get around the "can't use a restricted built-in in built-in XXX" message:
1. Create a TIMER at the point where you want the navigation to occur. Eg.
create_timer('TIMER_X', 5, NO_REPEAT);
2. Code a WHEN-TIMER-EXPIRED trigger to handle the navigation
DECLARE
tm_name VARCHAR2(20);
BEGIN
tm_name := Get_Application_Property(TIMER_NAME);
IF tm_name = 'TIMER_X' THEN
Go_Item('ITEM_X');
END IF;
END;
Dirty but effective (didn't Oracle promise to fix this feature?).
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Can one change the mouse pointer in Forms?
The SET_APPLICATION_PROPERTY build-in in Oracle Forms allow one to change
the mouse pointer. Eg:
SET_APPLICATION_PROPERTY(CURSOR_STYLE, BUSY);
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Why doesn't my messages show on the screen?
Regardless of whether you call the MESSAGE() built-in with ACKNOWLEDGE, NO_ACKNOWLEDGE, or with no mode specification at all, your message may or may not be displayed.
This is because messages are displayed asynchronously. To display messages immediately, use the SYNCHRONIZE build-in:
message('...'); synchronize;
This can also be used to execute a query while the user is
looking at the results of a previous query.
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What happened to SQL*Menu?
From Forms V4.5, SQL*Menu is fully integrated into Oracle Forms.
Application menus can be added to your application by creating
Menu Modules (*.MMB) and generate it to Menu Module Executables (*.MMX).
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How does one create a custom toolbar?
Create a new block, let's name it "TOOLBAR" and a canvas named "C_TOOLBAR"
(for ilustration purposes).
Put some iconic buttons on your canvas. Use the following properties for these
buttons:
Enabled: True
Navigable: False
Mouse Navigate: False
Now set the "Canvas Type" in the canvas property palette to "Horizontal Toolbar"
and the "Form Horizontal Toolbar Canvas" in the module property palette to your
canvas name (C_TOOLBAR in our case).
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How does one compile MS Help files?
The Microsoft Help Compiler does not ship with Designer/2000 or Developer/2000,
but you can download it from here:
Note: Designer/2000 includes a Help Generator that can generate source files for the Help Compiler.
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How can I read/write OS Files from Forms?
OS files can be read/written from Forms using the TEXT_IO package in
Forms. The TEXT_IO package has a datatype FILE_HANDLE. It also has
procedures FCLOSE, GET_LINE, NEW_LINE, PUT, PUT_LINE & PUTF and a function
FOPEN. Example:
DECLARE
file1 TEXT_IO.FILE_TYPE;
file2 TEXT_IO.FILE_TYPE;
str VARCHAR2(80);
BEGIN
file1 := TEXT_IO.FOPEN( 'input.txt','r' );
file2 := TEXT_IO.FOPEN( 'output.txt', 'w' );
TEXT_IO.GET_LINE( file1, str );
TEXT_IO.PUT_LINE( file2, str );
TEXT_IO.FCLOSE( file1 );
TEXT_IO.FCLOSE( file2 );
END;
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How can I generate all my forms in a batch?
@echo off
@echo. +----------------------------------------------------------
@echo. | FMXGNALL.BAT
@echo. +----------------------------------------------------------
@echo. |
@echo. | Create runtime FMXs from source FMBs
@echo. | Will convert ALL of the fmbs in the current direcotry
@echo. | Usage : FMXALL.BAT username/password@connect string
@echo. |
@echo. +----------------------------------------------------------
@echo.
@echo. Username/Password@connect_string = %1
@echo.
IF %1 == "" GOTO END
@echo Removing old FMX files
del *.fmx
@echo Creating the new FMX files
rem Change f45gen32 to f45gen if in 16 bit environment.
FOR %%F in (*.fmb) DO start /w f45gen32 userid=%1 batch=y module=%%F
@echo.
@echo Done!!! Remember to move the FMX files into your runtime directory.
@echo.
:END
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How does one get a form to run on Unix?
You need to design your form on your workstation.
FTP or copy the Forms's FMB file to the Unix box. If you generate for a
terminal environment (character based), the syntax is:
f45gen USERID=userid/passwd@db_name MODULE_TYPE=FORM MODULE=module_name
If you want to generate a Library file, replace FORM with LIBRARY. Use f45genm
to generate your form in a Motif environment.
Use the "f45run" command to run your form.
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Why do terminal users hate Forms?
Most Unix, MVS and VMS users do not like Forms 4.5/ 5.0 for a couple of reasons:
- You need to design on a PC and frequently get compatibility
problems (font scaling, etc);
- Forms 4.5 is no improvement for Forms 3.0 terminal users at all,
rather it is a step backwards;
- Forms 4.5 uses too much memory and executables are about 400%
larger than for its 3.0 counter part;
- The largest Oracle Forms customers still runs on Forms V3.0 and
will rather throw out Oracle than to convert to Forms 4.5.
I think Oracle should bring SQL*Forms v3.0 back for terminal users.
They could rename the product to Oracle Forms for Terminals, or
something.
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Where can I get more info about Oracle Forms?
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