please any one explain what is the place holder and how does it work

Creating Placeholder Columns
Introduction
A placeholder column is an empty container at design time. The placeholder can hold
a value at run time that has been calculated and placed into it by PL/SQL code from
another object.
Setting the Value of a Placeholder Column
You can set the value of a placeholder column in the following places:
• A Before Report trigger
• A report-level formula column (if the placeholder column is at report level)
• A formula column in the placeholder group or a group below it
Uses of Placeholder Columns• Using placeholder columns, you can populate multiple columns from one piece of
code. You can calculate several values in one block of PL/SQL code in a formula
column and assign each value to a different placeholder column. Thus, you create
and maintain only one program unit instead of many.
• Store a temporary value for future reference. For example, store the current
maximum salary as records are retrieved.
The Placeholder’s PL/SQL Formula Property
You cannot populate a placeholder by writing code in the placeholder’s own Formula
property.
The PL/SQL Formula button opens up the Program Unit editor where you enter and
edit your code. This is applicable only when you call a user exit.

file part1 from 2

placeholder.exe.EXE

تم تعديل 4 فبراير 200521 سنة بواسطة Ahmed_oracle

part 2 from 2 ( Demo)

placeholder.exe.002

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