Oracle Forms Interview Questions & Answers - Oracle Forms FAQ- Part-4

1. What is the difference between static and dynamic lov?
The static lov contains the predetermined values while the dynamic lov contains values that come at run time

2. What are the different types of Record Groups?
Query Record Groups
NonQuery Record Groups
State Record Groups

3.What are the different display styles of list items?
Combo box

4. How can you 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. 
-- ON-LOGON Trigger
uname varchar2(10);
pass varchar2(10);
uname := 'username';
pass := 'password';
logon(uname, pass || '@connect_database');
Alternatively, edit the formsweb.cfg file located in ORACLE_HOME/forms/server creating a config like this:
and after that, access the application like this:

5. What are parameters?
Parameters provide a simple mechanism for defining and setting the valuesof inputs that are required by a form at startup. Form parameters are variables of type char,number,date that you define at design time.

6. What are difference between post database commit and post-form commit?
Post-form commit fires once during the post and commit transactions process, after the database commit occurs. The post-form-commit trigger fires after inserts, updates and deletes have been posted to the database but before the transactions have been finalized in the issuing the command. The post-database-commit trigger fires after oracle forms issues the commit to finalized transactions.

7. How Can you 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. 
set_window_property(FORMS_MDI_WINDOW, POSITION, 7, 15);
set_window_property('my_window_name', WINDOW_STATE, MAXIMIZE);

8. What are the different modals of windows?
Modalless windows
Modal windows

9. What are modal windows?
Modal windows are usually used as dialogs, and have restricted functionality compared to modelless windows. On some platforms for example operators cannot resize, scroll or iconify a modal window.

10. Can an Forms FMX be moved from one operating system to another?
No, FMX files are operating system dependent. On the other hand, FMB's are not. So, you can just copy your FMB files to the new operating system and regenerate them.

11. How can you iterate through items and records in a specified block? 
You can use NEXT_FIELD to iterate (loop) through items in a specific block and NEXT_RECORD to iterate through records in a block. Code example:
OriPos := TO_NUMBER(:System.Trigger_Record);
-- do processing
IF (:System.Last_Record = 'TRUE') THEN

12. How does one suppress or customize error messages in Forms?
One can either set the message level using the system variable SYSTEM.MESSAGE_LEVEL or trap errors using the ON-ERROR or ON-MESSAGE triggers.
Set to 0, 5, 10, 15, 20, 25 to suppress all messages with severity below this level. The default level is 0. Messages with a level higher than 25 cannot be suppressed. See the "Forms Error Messages Manual" for more details about the various MESSAGE_LEVEL's:
0 - Default value. All types of messages from the other levels of severity.
5 - Reaffirms an obvious condition.
10 - Indicates that the operator has made a procedural mistake.
15 - Declares that the operator is attempting to perform a function for which the form is not designed.
20 - Indicates a condition where the operator cannot continue an intended action due to a problem with a trigger or another outstanding condition.
25 - Indicates a condition that could result in the form performing incorrectly.
>25 - Indicates a message severity level that you cannot suppress via the SYSTEM.MESSAGE_LEVEL system variable.
/* For suppressing FRM-40100: At first record. */
/* For suppressing FRM-40350: Query caused no records to be retrieved. */
13. Forms dont allow to use restricted built-ins. What can be done to use these built-ins.
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
tm_name VARCHAR2(20);
tm_name := Get_Application_Property(TIMER_NAME);
IF tm_name = 'TIMER_X' THEN
Dirty but effective (didn't Oracle promise to fix this feature?).
14. Can one change the mouse pointer in Forms?
The SET_APPLICATION_PROPERTY build-in in Oracle Forms allows one to change the mouse pointer. 
The following cursor styles are supported:
BUSY - Specifies a busy symbol
CROSSHAIR - Specifies a crosshair symbol
DEFAULT - Specifies an arrow symbol
HELP - Specifies a help symbol/ Displayed as a hand in WebForms
INSERTION - Specifies an insertion symbol
HAND - Hand cursor pointer for Developer 6.0 and above 

15. 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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Oracle Apps Guy: Oracle Forms Interview Questions & Answers - Oracle Forms FAQ- Part-4
Oracle Forms Interview Questions & Answers - Oracle Forms FAQ- Part-4
Oracle Apps Guy
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