June 21, 2002 Timothy Prickett Morgan
Can I pass parameters to an SQL statement in a source member before executing the Run SQL Statement (RUNSQLSTM) command? I’m sure there must be a simple way, but I’ve never seen any examples of this.
For example, today I might like to have the SQL statement select company 005. Tomorrow I might want it to select company 007.
What you want is the ability to put placeholders in the SQL source and specify replacement arguments on the RUNSQLSTM command, as you can do with the Start Query Management Query (STRQMQRY) command.
It may be worth the effort to write an RPG, COBOL, or C program that will build or update a source member for you.
Another option is to use Qshell’s stream editor, sed. Most source-code editors I’ve used are for interactive editing, but batch editors do exist, although they’re rare. Sed is such a batch editor.
As an exercise to prove the concept, I created a source member called UPDTCUSPAT (PAT to indicate pattern) with an SQL command in it. I put CCC as a placeholder for the company number:
update customer set creditlim = 0 where company = CCC
I copied source member UPDTCUSPAT to source member UPDTCUS in order to create a source member to hold the SQL statement that will be executed.
I developed the necessary sed command in an interactive Qshell session:
sed "s%CCC%002%g" /qsys.lib/tholts.lib/sqlsrc.file/updtcuspat.mbr >/qsys.lib/tholts.lib/sqlsrc.file/updtcus.mbr
This command tells Qshell to read updtcuspat, replacing every occurrence of CCC with 002, and to put the output into updtcus. That is, the stream editor doesn’t change the updtcuspat source member, but makes an updated copy of it.
Then I wrote a CL program that takes a company number as a parameter, builds the sed command, executes the sed command to build UPDTCUS, and finally runs RUNSQLSTM:
pgm &company dcl &lib *char 10 value('tholts') dcl &file *char 10 value('sqlsrc') dcl &patternmbr *char 10 value('updtcuspat') dcl &sqlcmdmbr *char 10 value('updtcus') dcl &company *char 3 dcl &shellcmd *char 256 chgvar var(&shellcmd) + value('sed "s%CCC%' *cat &company *cat '%g"' *bcat + '/qsys.lib/' *cat + &lib *tcat '.lib/' *cat + &file *tcat '.file/' *cat + &patternmbr *tcat '.mbr' *bcat + '>/qsys.lib/' *cat + &lib *tcat '.lib/' *cat + &file *tcat '.file/' *cat + &sqlcmdmbr *tcat '.mbr') QSH CMD(&SHELLCMD) RUNSQLSTM SRCFILE(&LIB/&FILE) SRCMBR(&SQLCMDMBR) + COMMIT(*NONE)
It works, but I haven’t tried it in a production environment.
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