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Showing posts from June, 2012

How many types of column in Oracle Report Builder

There are three types of columns in Oracle report.
Placeholder Column : Placeholder column is used to store a value for a variable.
Formula Column :  Used For doing mathematical calculations and returning one value
Summary Column : The summary columns perform aggregate functions such as SUM, COUNT, MAX, MIN, AVG, and the like.

What are bind variables in Oracle Report Builder

Bind variables are used in oracle reports  for replacing the single parameter in the SELECT statement.
Example
SELECT * FROM employee e WHERE e.emp_no = :empno;

What is a lexical parameter in Oracle Report Builder

Lexical Parameter is used to replace the where clause at run time. Lexical Parameter identified by & sign and are used to execute query dynamically.
Example
Select * from employee &where

What happens when confine mode ON in Oracle Report Builder

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When confine mode is on, the object cannot be moved outside its parent in the layout.

What happens when Flex mode is ON in Oracle Report Builder

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When flex mode is ON, reports automatically resizes the parent when the child is resized.

Difference between After Parameter Trigger and Before Report Trigger in Oracle Report Builder

After parameter Trigger : It will fire after the parameter form is displayed and here we can do validation on parameter values.
Before Report Trigger : It will fire before the report is executed and after the query is parsed and date is fetched.

How does we customize error messages in Oracle Forms

We can set the message level using the system variable SYSTEM.MESSAGE_LEVEL or trap errors using the ON-ERROR or ON-MESSAGE in Form level triggers.

MESSAGE_LEVEL:


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.

Difference between Post Database Commit and Post Form Commit in Oracle Forms

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.

What are parameters in Oracle Forms

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



What are the different display styles of List Items in Oracle Forms

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1) Text_list
2) Pop_list
3) Combo box



What are the different types of Record Groups in Oracle Forms

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1) Query Record Groups
2) Static Record Groups



Difference between Static and Dynamic LOV in oracle Forms

The static LOV contains the predetermined values while the dynamic LOV contains values that come at run time

Difference between LOV and List Item in Oracle Forms

LOV is a property where as list item is an item. A list item can have only one column, LOV can have one or more columns.

What is the Validate from List Property of an item in Oracle Forms

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When Validate from List is set to True, Oracle Forms compares the current value of the text item to the values in the first column displayed in the LOV. Whenever the validation event occurs. If the value in the text item matches one of the values in the first column of the LOV, validation succeeds, the LOV is not displayed, and processing continues normally. If the value in the text item does not match one of the values in the first column of the LOV, Oracle Forms displays the LOV and uses the text item value as the search criteria to automatically reduce the list.


Block Coordination Properties in Oracle Forms

Immediate Default Setting : The Detail records are shown when the Master Record are shown.


Deffered with Auto Query : Oracle Forms defer fetching the detail records until the operator navigates to the detail block.


Deffered with No Auto Query : The operator must navigate to the detail block and explicitly execute a query

How many types of Blocks in Oracle Forms

Base Table Block - based on database table/views
Control Block -non-database items are placed here like Calculation values, buttons, checkbox etc.

What are the different canvas types available in Oracle forms

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Below are the 5 canvas types available in Oracle Forms

(a) Stacked canvas
(b) Content canvas
(c) Horizontal Tool bar
(d) Vertical Toolbar
(e) Tab canvas



which Triggers are by default relates to Master Details Block in Oracle Forms

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Following are three triggers which are created automatically as soon as we create a mater Details Block on oracle Forms.

ON-CHECK-DELETE-MASTER
ON-CLEAR-DETAILS
ON-POPULATE-DETAILS




How many types of Master and Detail relationships are there in Oracle Forms

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The various Master and Detail Relationships in oracle forms are:

NonIsolated
The Master cannot be deleted when a child is existing


Isolated
The Master can be deleted when the child is existing


Cascading
The child gets deleted when the Master is deleted.



What is a Visual Attribute in Oracle Forms

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Visual attributes are the font, color, and pattern properties that you set for form and menu objects that appear in your application's interface.



What are the differences between OPEN_FORM, CALL_FORM and NEW_FORM in Oracle Forms

CALL_FORM : It calls the other form. but parent remains active, when called form completes the operation , it releases lock and control goes back to the calling form. When you call a form, Oracle Forms issues a savepoint for the called form. If the CLEAR_FORM function causes a rollback when the called form is current, Oracle Forms rolls back uncommitted changes to this savepoint.
OPEN_FORM : When you call a form, Oracle Forms issues a savepoint for the called form. If the CLEAR_FORM function causes a rollback when the called form is current, Oracle Forms rolls back uncommitted changes to this savepoint.

Benefits to use Views in Data Block in Oracle Forms

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Views are used in the data blocks of a standard form instead of mapping directly into the base tables because base tables have huge amount of data due to which if we work directly on the base tables, it will hit the performance. 

Also, views are simplified versions of the base tables which are easy to understand and hence to work upon.

What is the use of Custom Library in Oracle Forms 10g

Custom.pll is used to implement any new PL/SQL code that you would need to write in customizing oracle forms.

What is Oracle Template Form

Template Form is a form that is to be used for building a new form and this form references all the standard libraries like(FNDSQF,APPCORE,APPCORE2,APPDAYPK,CUSTOM) which are used to build a form as per the oracle standards. This Template form has been provided by Oracle.

Some Oracle Forms Tiggers that should not be modified

Following are some of the Oracle Form triggers that must not be modified.

CLOSE_THIS_WINDOWCLOSE_WINDOWEXPORTFOLDER_ACTIONKEY-COMMITKEY-EDITKEY-EXITKEY-HELPLAST-RECORDMENU_TO_APPCORESTANDARD_ATTACHMENTSWHEN-WINDOW-CLOSEDWHEN-FORM-NAVIGATE