positioning the file pointer and calling programs
DESCRIPTION
Positioning the File Pointer and calling programs. Fall 2011. SETLL – Positioning the File Pointer. Sequential Access File Positions the file pointer at the first record where the key field is greater than on equal to what’s looked for Must be followed by a READ - PowerPoint PPT PresentationTRANSCRIPT
Positioning the File Pointer and calling programs
Fall 2011
SETLL – Positioning the File Pointer• Sequential Access File• Positions the file pointer at the first record where
the key field is greater than on equal to what’s looked for
• Must be followed by a READ• Use %FOUND to determine if the record found is
greater than or equal to the key field• Use %EQUAL to determine if the record found is
exactly the same as the key field that you are looking for
SETLL Example
/Freesetll *loval custmast;
read custmast;/end-free
SETLL – Example
/Freesetll custin custmast;
if %equal(custmast);exsr validcust;
else;exsr invalidcust;
endif;/end-free
Custno Note Note_dtls1 1 Customer arrived1 2 Customer left3 1 Customer away
If Custin = 1, then the file pointer for the first record will be returned
SETGT
• Sequential Access File• Positions the file pointer at the first record where the
key field is greater than what’s looked for• Must be followed by a READ• Use %FOUND to determine if the record found is
greater than the key field
Setgt Example
/Freesetll custin custmast;
if %equal(custmast);exsr validcust;
else;exsr invalidcust;
endif;/end-free
Custno Note Note_dtls1 1 Customer arrived1 2 Customer left3 1 Customer away
If Custin = 1, then the file pointer for the last record will be returned
Calling Programs
Code in pgmADfullreport PR EXTPGM(‘REPORT’)/free callp fullreport();
Code in pgmB
pgmA pgmBNo parametersPassed
Calling Programs
Code in pgmA Code in pgmBDDtlreport PR EXTPGM(‘REPORT’) Ddtlreport PRD parm1 10A D parm1 10A/free Ddtlreport PI callp Dtlreport(field1); D parm1 10A
Code in pgmB
pgmA pgmBparametersPassed