Contexts parameters

8/7/2019 Contexts parameters

1/18

Context in the action diagram

Identifying field as a parameter for a

condition or built in function is a two step .

Identify the context of the field

you must select a specific field to belong to that type

DB and Design context : DB1 - Fields in the first data base record

DB2 - Fields in the 2nd data base record


2/18

Context in the action diagram

KEY - Fields in Key screen

DTL - Fields in 1st detail screen display 2nd - Fields in the 2nd detail screen display

3rd - Fields in the 3rd detail screen display

CTL - Fields in the sub file control of thescreen

RCD - Fields in the sub file part of the

screen display


3/18

Literal context

Literal context :CND - Used to establish that pre defined

condition value to be used

CON - Used to indicate a constant orLiteral value to be supplied

As per the Nike standard use only condition

not Constant


4/18

System context

System contextSystem context identifies fields that supply run time information and

fields that can be used to control the execution of programs

JOB - System fields that supply execution time information

Examples (Partial list)

Field Role

User System name of job user

Job Date Current date of job

Job time Current time of job date


5/18

System context

Program mode -

Add,Auto,change,display,enter,Select

Return code - Normal,User Quit , etc

Record selected - Yes , No

Reload sub file - Yes , No Scan limit - Enter the No of records


6/18

LCL and WRK context

LCL context is Local to a function where

WRK is global to function

As per Nike programming standards we

have to strictly use LCL context rather than

WRK context .

Give preference to LCL where ever it is

a licable


7/18

Report device context

Current report Format (CUR) - refers to

format being processed at this point in the

report function

Next report Format(NXT) - refers to the

format following CUR format


8/18

NLL(

Null context)

NLL context is used only in the output parameters .

The purpose of NLL is to nullify the output parameters.

The main usage is when we use existing RTVOBJ which

has got many output parameters and you need only few

parameters to be used in the calling functions , retrieve theremaining parameters in the NLL context .


9/18

Generartion errors

When errors occur during the generation of

function you can locate the errors and

determine their nature by scanning through

the source code

Type F followed by E* y2 . Any Synon

error message will start with this error


10/18

Compilation errors

Go to the spool file and find out the errors

Another method is you can go to Job log

and find the errors


11/18

Impact analysis

If you make a change to your database

design and compiled the design objects,you

must recompile all functions using the

database

If you make a change to a internal function

regenerate the all used internal as well as

external functions .


12/18

To find the USA

GE

Type U in the Edit function next to the

function which you want to find the usage .

In the scope Type *GENFUN and filter

*GENFUN where all the generated

functions using the functions will be

displayed .


13/18

P

arameters

Parameters is the primary method used to

pass values between functions .

This is true for both internal and external

functions .


14/18

B

asic properties ofP

arameters

Name

Usage Type

Role


15/18

N

ame ,Usage-P

arameter Name : The function parameter name defines the name of the field

to be used as parameter

Usage :Usage is defined in reference to the function which receives it

or returns value

Input only - When a function is called , a value is

passed into the function for the parameter . No value

is returned

Output only - When the function finishes a value is

returned from the function

Both - (input and output) When the function is

called a value is passed in . When the function

finishes a value is returned


16/18

P

arameter-N

either

Neither - It is neither input nor output nor

Both . The parameter is mainly used as a

Local variables in the versions when LCL

context was not available


17/18

Fu

nction parameters-Role

The role of the function parameter specifies

how the parameter will be used in the

function into which it was passed

MAP parameter- The parameter is

automatically moved into the corresponding

field on the receiving functions panel

design


18/18

P

arameter-Role Restrictor parameter - This parameter is used to restrict

which records from a database file will be displayed

changed or printed by the functions . RST parameter mustbe the key fields .

Positions parameter - This parameter is used to position a

function to start reading records from a database file at a

particular record. It must be key fields in the access path

to which the their function attaches .

Documents

Contexts parameters