In CICS, you can retrieve data either from files or DB2. Files are two types – VSAM and BDAM. Once you define the files to CICS, the next task is retrieve records. This you can do by using CICS commands in application program(For instance, COBOL/PLI programs).
I gathered possible interview question on this topic. How to browse a record from a file of KSDS/ESDS/RRDS or BDAM?.
BDAM files those store in Direct access storage. On the contrary, VSAM files reside in Virtual storage. The top CICS users are HSBC/General Motors/Allstate. Here’s a quick note that CICS does not support LDS files.
The RIDFLD tells that you are accessing BDAM files. The STARTBR command establishes a record based on RIDFLD. Here is my other post on how to browse VSAM files in CICS.
START Browse EXEC CICS Macro
XX00-START-CUSTOMER-BROWSE. * EXEC CICS STARTBR FILE('SRINIMF') RIDFLD(CM-CUSTOMER-NUMBER) EQUAL RESP(RESPONSE-CODE) END-EXEC. EVALUATE RESPONSE-CODE WHEN DFHRESP(NORMAL) MOVE 'Y' TO CUSTOMER-FOUND-SW WHEN DFHRESP(NOTFND) MOVE 'N' TO CUSTOMER-FOUND-SW WHEN OTHER PERFORM 9999-TERMINATE-PROGRAM END-EVALUATE.
The above example says that how to handle the files. Once it matches the key value, it sends the proper value to the program variable. Else, it terminates the program.
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Start Browse Advanced Options
EXEC CICS STARTBR FILE(filename) RIDFLD(data-name) [RRN | RBA] [GTEQ | EQUAL] [GENERIC] [KEYLENGTH(data-name | literal)] END-EXEC
In the above example, I have explained how to use KSDS/ESDS file and with advances options.
After the STARTBR, the other options are READNEXT and READPREV. So each command maximum length is ‘8’ bytes and not more than that.