This will take some time.

Download the utilities from the MC Press site and put all the CMD, RPGLE, and CLLE sources into a source file and the Java sources and classes into the /excel IFS folder, both in your iSeries.

Compile the programs and the commands as usual (option 14 from PDM easily does the job). When creating the command, don't forget to specify a CPP that has the same name as the command plus the letter "C." You can use the Java classes as downloaded or recreate them using a simple CL interface with Qshell (available in the download) to make the task easier.

Now you're ready to go, but before launching the commands, you need to know a few things:

The SQL2POI and SQL2JXL commands have a CL CPP that, before invoking Java, calls an RPG program that receives the SQL statement, reformats it into a valid SQL statement by replacing the special characters (like the square brackets), writes it into a text document into the excel folder, assigns an ID to it, and passes it back to the CPP. This is because the RUNJVA command we use to invoke the Java classes accepts parameters up to 256 characters each, but certainly you would be able to run a much longer SQL statement. The Java module will get this SQLID among the parameters and read the SQL statement from the IFS. At the end, the text file containing the SQL statement is deleted. If you write an Excel document from scratch, both implementations work quite the same, but if you add data or add a new sheet to an existing workbook, the POI API rewrites the document at the end, while the JExcelApi clears it at the beginning and writes the data at the end. This means that if something goes wrong while updating the workbook, you will get an empty document and, unfortunately, lose the original document. To avoid this, the CL forces Java to write data into a work copy that will be renamed at the end of procedure, if everything went well.

Last but not least, as in the RPG version, the command provides the parameter COLHDRS(*LABEL), but note that the ability to retrieve via JDBC the field label (which can be set by SQL statement LABEL ON or DDS keyword COLHDG) in addition to the field name has been added recently, and it works only starting from V5R2. To have it working correctly even at this release level, you need to be current with the latest PTFs, otherwise, if you want to include a column header, I suggest you use an SQL statement with the "as" clause, like "select MyField as [wrappedcolumnheader] from MyTable."

Enjoy it!

Giuseppe Costagliola is a programmer in Turin, Italy. You can reach him at This e-mail address is being protected from spam bots, you need JavaScript enabled to view it .