Comments on: Using cursor in SQLRPGLE

By: philpl1jb

philpl1jb — Wed, 10 Oct 2012 13:22:37 +0000

Can i use single cursor for multiple SQL statements? ex: declare c1 cursor for select * from ……. also declare c1 cursor for select * from xxx
No. I’ve forgotten if it was the precompiler or compiler that rejected this regardless of the close cursor commands.

But as BigCat pointed out you can use a single dynamic SQL command multiple times with different SQL statments, just remember to close the cursor after use.
Phil

By: BigKat

BigKat — Wed, 10 Oct 2012 12:37:02 +0000

exec sql prepare sql1 from :stmsql1;
exec sql declare csr1 cursor for sql1;
exec sql open csr1 using :fltvnd, :fltvnd, :fltdsc, :fltdsc;
exec sql fetch csr1 into :fpitmmas;
exec sql close csr1;

By: BigKat

BigKat — Wed, 10 Oct 2012 12:35:04 +0000

yes, you can build a select statement in a variable, then
exec sql prepare sql1 from :stmsql1; exec sql declare csr1 cursor for sql1; exec sql open csr1 using :fltvnd, :fltvnd, :fltdsc, :fltdsc; exec sql fetch csr1 into :fpitmmas; exec sql close csr1;
then re-build a new select and repeat as desired

By: TomLiotta

TomLiotta — Wed, 10 Oct 2012 12:12:18 +0000

Sorry. The four lines of code ran together.

sql_stmt = ‘SELECT * FROM …’
exec sql prepare stmt from :sql_stmt;
exec sql declare C1 cursor for stmt;
exec sql open C1;

Those might or might not come across as readable.

Tom

By: TomLiotta

TomLiotta — Wed, 10 Oct 2012 12:08:51 +0000

I’ve never tried. I suppose that as long as one cursor was closed before you opened the other, and the two declares themselves were on different code paths, it could be done.

But it’s hard to think of a reason to do it since there’s a far easier alternative:

sql_stmt = ‘SELECT * FROM …’exec sql prepare stmt from :sql_stmt;exec sql declare C1 cursor for stmt;exec sql open C1;

(That code looks perfect in the editor, but I suspect it will look a mess when I submit it.) Multiple assignments can be made for sql_stmt to use whatever SELECT statement you want. (Of course, you should never use “*” for the column list; but that’s not what you’re asking about.)

Tom