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ID_NULL built in function is used to determine that an object type variable is null or not null in Oracle Forms and returns a BOOLEAN value that indicates whether the object ID is available or not means it is null or not null. 

Below is the Syntax of ID_Null function:

FUNCTION ID_NULL
(Objectid);

Where Objectid can be one of the following objects: Alert, Block, Canvas, Editor, FormModule, GroupColumn, Item, LOV, MenuItem, ParamList, RecordGroup, Relation, REPORT_OBJECT, TabPage, Timer, Viewport, VisualAttribute and Window.

Use ID_NULL when you want to check for the existence of an object created dynamically at runtime. For example, if a specific record group already exists, you will receive an error message if you try to create that record group. To perform this check, follow this general process: Use the appropriate FIND_ Built-in to obtain the object ID. Use ID_NULL to check whether an object with that ID already exists. If the object does not exist, proceed to create it. 

See Examples for ID_NULL with the following link: 



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id_null function usage explanation to find an object id in Oracle forms.

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V. Kapoor

{picture#https://3.bp.blogspot.com/-q3wCssWUHo8/ViDFfCpPEuI/AAAAAAAAD0M/MHPvgnl3T3U/s1600/authpic.JPG} Vinish Kapoor is a Software Consultant, currently working in a reputed IT company in Noida, India and doing blogging on Oracle Forms, SQL and PLSQL topics. He is an author of an eBook Oracle Forms Recipes, which is available on Google play. {facebook#https://www.facebook.com/foxinfotech2014} {twitter#https://twitter.com/foxinfotech} {google#https://plus.google.com/u/0/+VKapoor/posts}
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