This document contains a COBOL program with explanations to demonstrate database access using function codes. It defines working storage variables for the function codes and qualified/unqualified SSAs to the master and detail segments. The linkage section defines the IO-PCB and DB-PCBs needed. The procedure division makes calls to the database using the different function codes and passing the appropriate PCBs and SSAs.

1. IMSDB - COBOL
Program with explanation

2. Program
Identification Division.
Program-ID. BATCOBOL.
Environment Division.
Data Division.
Working-Storage Section.
01 Func-Codes.
05 Func-GU Picture XXXX Value 'GU '.
05 Func-GHU Picture XXXX Value 'GHU '.
05 Func-GN Picture XXXX Value 'GHN '.
05 Func-GHN Picture XXXX Value 'GHN '.
05 Func-GNP Picture XXXX Value 'GNP '.
05 Func-GHNP Picture XXXX Value 'GHNP'.
05 Func-REPL Picture XXXX Value 'REPL'.
05 Func-ISRT Picture XXXX Value 'ISRT'.
05 Func-DLET Picture XXXX Value 'DLET'.
05 Parmcount Picture S9(5) Value +4 Comp-5.

3. Program
• This is same as regular cobol program. We
have defined function codes – 4 bytes

4. Program
01 Unqual-SSA.
05 Seg-Name Picture X(08) Value ' '.
05 Filler Picture X Value ' '.
01 Qual-SSA-Mast.
05 Seg-Name-M Picture X(08) Value 'ROOTMast'.
05 Begin-Paren-M Picture X Value '('.
05 Key-Name-M Picture X(08) Value 'KeyMast '.
05 Kel-Oper-M Picture X(05) Value ' ='.
05 Key-Value-M Picture X(06) Value 'VVVVVV'.
05 End-Paren-M Picture X Value ')'.
01 Qual-SSA-Det.
05 Seg-Name-D Picture X(08) Value 'ROOTDET '.
05 Begin-Paren-D Picture X Value '('.
05 Key-Name-D Picture X(08) Value 'KEYDET '.
05 Rel-Oper-D Picture X(05) Value ' ='.
05 Key-Value-D Picture X(06) Value 'VVVVVV'.
05 End-Paren-D Picture X Value ')'.
01 Det-Seg-In.
05 Data1 Picture X.
05 Data2 Picture X.
01 Mast-Seg-In.
05 Data1 Picture X.
05 Data2 Picture X.

5. Program
• In the working storage section we need to
define SSA – both qualified and non-qualified.

6. Program
linkage section.
01 IO-PCB.
05 Filler Picture X(10).
05 IO-Status-Code Picture XX.
05 Filler Picture X(20).
01 DB-PCB-Mast.
05 Mast-Dbd-Name Picture X(8).
05 Mast-Seg-Level Picture XX.
05 Mast-Status-Code Picture XX.
05 Mast-Proc-Opt Picture XXXX.
05 Filler Picture S9(5) Comp-5.
05 Mast-Seg-Name Picture X(8).
05 Mast-Len-KFB Picture S9(5) Comp-5.
05 Mast-Nu-Senseg Picture S9(5) Comp-5.
05 Mast-Key-FB Picture X(256).
01 DB-PCB-Detail.
05 Det-Dbd-Name Picture X(8).
05 Det-Seg-Level Picture XX.
05 Det-Status-Code Picture XX.
05 Det-Proc-Opt Picture XXXX.
05 Filler Picture S9(5) Comp-5.
05 Det-Seg-Name Picture X(8).
05 Det-Len-KFB Picture S9(5) Comp-5.
05 Det-Nu-Senseg Picture S9(5) Comp-5.
05 Det-Key-FB Picture X(256).

7. Program
• In the linkage section we need to give IO-
PCB,DB-PCB,GSAM-PCB definitions.

8. Program
Procedure Division using IO-PCB DB-PCB-Mast DB-PCB-Detail.
Call 'CBLTDLI' using Func-GU DB-PCB-Detail
Det-seg-in Qual-SSA-Det.
.
.
Call 'CBLTDLI' using Parmcount Func-ghu DB-PCB-Mast
Mast-seg-in Qual-SSA-Mast.
.
.
Call 'CBLTDLI' using Func-GHN DB-PCB-Mast
Mast-seg-in.
.
.
Call 'CBLTDLI' using Func-REPL DB-PCB-Mast
Mast-seg-in.
.
.
Goback.

9. Program
• ENTRY 'DLITCBL' using PCB-MASK – This is to
be given only in main program in procedure
division. Not needed in sub-program
• All PCBs must be defined the order they
defined in PSB
• Why batch program needed IO-PCB with
CMPAT=YES => to make system service calls

10. Program
• The calls are with SSA both qualified and un-
qualified.

11. Thank You