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adding & before parameter name in data model [message #681293]

Sun, 05 July 2020 02:35

7anona
Messages: 72
Registered: February 2012

Member

hi all

what does it mean when there is & before parameter name in report data model

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Re: adding & before parameter name in data model [message #681294 is a reply to message #681293]

Sun, 05 July 2020 06:49

Littlefoot
Messages: 21598
Registered: June 2005
Location: Croatia, Europe

Senior Member
Account Moderator

I can't imagine what you are asking. Could you post a screenshot which illustrates the question, please?

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Re: adding & before parameter name in data model [message #681325 is a reply to message #681294]

Wed, 08 July 2020 04:27

7anona
Messages: 72
Registered: February 2012

Member

I am tryng to modify one report
in the data model of the report in where condition
there are multiple and conditions and then &parameter1.
parameter1 is listed in the user parameter of the report

what does it mean to have &parameter1 in where condition

I have to understand this in order to modify my report

thank you for your reply

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Re: adding & before parameter name in data model [message #681334 is a reply to message #681325]

Wed, 08 July 2020 15:53

Littlefoot
Messages: 21598
Registered: June 2005
Location: Croatia, Europe

Senior Member
Account Moderator

Aha. That's a lexical parameter.

Unlike "ordinary" parameters which are referenced with a colon sign, e.g.

select ename
from emp
where empno = :par_empno

lexical parameters allow you to compose the whole piece of a statement. That's usually done in the After Parameter Form trigger. Report accepts some parameter and - based on its value - creates a lexical parameter. For example, suppose you pass 7984 as PAR_EMPNO. Then you can do this:

:parameter1 := 'where empno = ' || :par_empno

and use it in report's query as

select ename
from emp
&parameter1

At runtime, it (&parameter1) is substituted by the value you created in the After Parameter Form trigger so it finally becomes

select ename
from emp
where empno = 7984

It is well described in Reports Online Help system; search for "lexical".

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Re: adding & before parameter name in data model [message #681336 is a reply to message #681334]

Wed, 08 July 2020 23:15

7anona
Messages: 72
Registered: February 2012

Member

got it
found it in After Parameter Form trigger.

thank you

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Re: adding & before parameter name in data model [message #681337 is a reply to message #681336]

Thu, 09 July 2020 04:57

Littlefoot
Messages: 21598
Registered: June 2005
Location: Croatia, Europe

Senior Member
Account Moderator

You're welcome.

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