tx-cics-tables

TXSeries CICS Data Tables prototype

This package is useful where you have tables of data which change infrequently, and you need high-performance access to the data by key. It was written for IBM TXSeries CICS, to offer function similar to mainframe CICS data tables, which are described here https://www.ibm.com/support/knowledgecenter/en/SSGMCP_5.1.0/com.ibm.cics.ts.applicationprogramming.doc/topics/dfhp3mm.html but it may also be useful in applications which are not run under CICS.

It was written for 'big endian' systems and tested on AIX; it would require some rework to run on a 'little endian' system.

First, build the code. There is a Makefile in directory 'src/islarge/src' which will build the library, libislarge.a , using the OSF 'make' process. If you have a different 'make', you should rewrite this Makefile appropriately. A suitable OSF 'make' is available here https://github.com/IBM/ode .

Next, write an application which will load data into your tables. There are sample applications for loading tables in the 'src/islarge/src' directory, but you will need to revise these for your application. When you run the table load application, it will create files containing the tables. This application can be written in C or C++. Files for the tables are written into the directory named by TABLE_DIRECTORY (see file src/islarge/include/table_int.h ) which by default is /var/pac_tables/ but may be changed if wanted. When you link this application, specify '-l islarge'.

Next, write the application which will use the data in the tables. This may be a transaction program for TXSeries CICS, or it may be some other application. This package supports applications written in C, C++, and COBOL. A sample application showing how to access data in tables is in src/islarge/src/use_table.c . When you link this application, specify '-l islarge'.

To run the application and access data in the tables, you need to copy the files for the table onto all nodes where the application may run. The files should go into the directory named by TABLE_DIRECTORY as above.

To change the data in the tables, run your application which loads the tables again with the new data, and copy the table files to the nodes where the application which accesses the tables runs. Then stop and restart the application which accesses the tables.

License

IBM/tx-cics-tables

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