Targeting COBOL programs for certain environments

Programming for a Db2 environment
In general, the coding for a COBOL program will be the same if you want the program to access a Db2® database. However, to retrieve, update, insert, and delete Db2 data and use other Db2 services, you must use SQL statements.
Developing COBOL programs for CICS
You can write CICS® applications in COBOL and run them on a Linux® workstation using CICS TX or TXSeries. The cicstcl utility included with CICS TX and TXSeries performs the translation, compiles the translated program, and links the resulting object by invoking cob2 to do the compilation and link, passing in the -qcics option. We recommend to use the cicstcl utility to write CICS applications. Alternatively, you can directly use the cob2 or cob2_cics compiler command with the -qcics option. There is no difference in functionality between the two methods.
Programming for a PostgreSQL environment
With the fix pack for APAR PH65575 installed, you can write COBOL programs that integrate with a PostgreSQL database through embedded SQL statements that enable you to retrieve, update, insert, and delete data.
Programming for a Java environment