|
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
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