Structuring Functions for Inline Validation
Structuring Functions to Use a Validation Subroutine
Using the RANGECKECK Command for Inline Validation
Using the RANGECHECK Command for Validation with a Subroutine
Structuring Functions for Inline Validation
Typically functions using validation commands (e.g.: CONDCHECK, DATECHECK, FILECHECK, RANGECHECK and VALUECHECK) are structured for inline validation like this:
BEGIN_LOOP
REQUEST << INPUT >>
BEGINCHECK
<< USE CHECK COMMANDS TO VALIDATE INPUT HERE >>
ENDCHECK
<< PROCESS THE VALIDATED INPUT HERE >>
END_LOOP
If a validation command inside the BEGINCHECK / ENDCHECK command block detects a validation error control is passed back to the REQUEST command. This happens because of the default IF_ERROR(*LASTDIS) parameter on the ENDCHECK command.
Structuring Functions to Use a Validation Subroutine
Typically functions using validation commands (e.g.: CONDCHECK, DATECHECK, FILECHECK, RANGECHECK and VALUECHECK) are structured for subroutine validation like this:
DEFINE FIELD(#ERRORCNT) REFFLD(#STD_NUM)
DEF_COND NAME(*NOERRORS) COND('#ERRORCNT = 0')
BEGIN_LOOP
DOUNTIL COND(*NOERRORS)
REQUEST << INPUT >>
EXECUTE SUBROUTINE(VALIDATE)
ENDUNTIL
<< PROCESS THE VALIDATED INPUT HERE >>
END_LOOP
SUBROUTINE NAME(VALIDATE)
CHANGE FIELD(#ERRORCNT) TO(0)
BEGINCHECK KEEP_COUNT(#ERRORCNT)
<< USE CHECK COMMANDS TO VALIDATE INPUT HERE >>
ENDCHECK IF_ERROR(*NEXT)
ENDROUTINE
If a validation command inside the BEGINCHECK / ENDCHECK command block detects a validation error control is returned to the main function loop with #ERRORCNT > 0.
Using the RANGECKECK Command for Inline Validation
This example demonstrates how to use the RANGECHECK command within the main program block to check that an employee number is within a range of values.
DEF_LIST NAME(#EMPBROWSE) FIELDS(#EMPNO #GIVENAME #SURNAME)
*
BEGIN_LOOP
REQUEST FIELDS(#EMPNO #GIVENAME #SURNAME) BROWSELIST(#EMPBROWSE)
*
BEGINCHECK
RANGECHECK FIELD(#EMPNO) RANGE((A0000 A9999)) MSGTXT('Employee number has to be in the range A0000 - A9999')
ENDCHECK
*
ADD_ENTRY TO_LIST(#EMPBROWSE)
END_LOOP
If the value of #EMPNO is outside the range of A0000 to A9999 the message defined with the RANGECHECK command is issued and program control returns to the last screen displayed. In this case the last screen displayed is the REQUEST screen.
Using the RANGECHECK Command for Validation with a Subroutine
This example demonstrates how to use the RANGECHECK command inside a subroutine to check an employee number is within a range of values.
After the user enters the requested details the VALIDATE subroutine is called. It checks that the value of #EMPNO is within the range of A0000 to A9999. If this is not true the message defined in the RANGECHECK command is given and the DOUNTIL loop executes again. When a value for #EMPNO is entered that is within the specified range the DOUNTIL loop ends and processing of the verified input is done.
DEFINE FIELD(#ERRORCNT) TYPE(*DEC) LENGTH(3) DECIMALS(0) DEFAULT(0)
DEF_COND NAME(*NOERRORS) COND('#ERRORCNT = 0')
DEF_LIST NAME(#EMPBROWSE) FIELDS(#EMPNO #GIVENAME #SURNAME)
*
BEGIN_LOOP
DOUNTIL COND(*NOERRORS)
REQUEST FIELDS(#EMPNO #GIVENAME #SURNAME) BROWSELIST(#EMPBROWSE)
EXECUTE SUBROUTINE(VALIDATE)
ENDUNTIL
*
ADD_ENTRY TO_LIST(#EMPBROWSE)
END_LOOP
*
SUBROUTINE NAME(VALIDATE)
CHANGE FIELD(#ERRORCNT) TO(0)
*
BEGINCHECK KEEP_COUNT(#ERRORCNT)
RANGECHECK FIELD(#EMPNO) RANGE((A0000 A9999)) MSGTXT('Employee number has to be in the range A0000 - A9999')
ENDCHECK IF_ERROR(*NEXT)
*
ENDROUTINE
