Re: Calling CL program to delete .ZIP file in IFS as part of an SQL Delete

Using SQL seems the hard way to do it. Use QCMDEXC, passing it a variable for the date that uses RPG date functions to get current date less 1 month. No need for even yet one more program just to have a UDF.

Maybe I'm missing something, but a UDF here violates the KISS principle for me.

Eh?
Vern

Charles Wilt wrote:

All,

We've got an existing SQLRPGLE program that contains basically the statement:

delete from mytable
where datefld <= CURRENT_DATE - 1 month;


Datefld is non-unique, so many records could have the same date.

One of the other developers came to me and asked if there was a way to
call a CL program that will delete a .ZIP file with a naming
convention that includes the date for any dates being deleted from the
table. Example: MY_ARCHIVE_yyyyy-mm-dd.ZIP

The developer already had a CL program that when passed the date,
would delete the .ZIP.

My first thought, sure we can create a user defined function to call
the CL during the execution of the SQL statement...
delete from mytable
where datefld <= CURRENT_DATE - 1 month
and Delete_Zip_File(char(datefld,ISO)) = '0';


Anybody see a problem with this? (hint consider non short circuit
evaluations ;)

Then I thought well we'll just run two statements:
with tbl as (select distinct datefld
from mytable
where datefld <= CURRENT_DATE - 1 month
)
select Delete_Zip_File(char(datefld,ISO))
from tbl;

delete from mytable
where datefld <= CURRENT_DATE - 1 month;


But the compiler doesn't like me doing a SELECT instead of a SELECT INTO...

Anyway, the developer is looking at just using RPG RLA to delete the
rows, calling the CL program normally when the date changes.

But I thought it's an interesting issue and I figured I thought it out
here to see if anybody had any better ideas.

Thanks!
Charles Wilt