Re: Write to db containing values defined by DB2 -- MI400

Dennis,

That's a workable alternative. The downside (on a more global level, vs. the ) is that is requires explicit coding of all the fields to be updated in all the programs that you do a WRITE to this file. A plain WRITE would override the fields using the data type's default.

Just to throw an older style technique out there that should also work nicely is to use EXCEPT, specifying the fields you want to update. Note that field ending positions are omitted.

OFILE EADD ADDREC
O GRPNAME
O CUSER

BTW, is the syntax of the write you have below correct? I think you mean:

Write myFormat %Fields(col1: col3: col5: col6) ;

-mark

At 9/16/2010 11:20 AM, you wrote:

If I may step in, the RPG syntax capability that Erik would like to
duplicate is like this:

Write (col1, col3, col5, col6) myFormat ;

This writes to the select fields, and asks DB2 to fill in defaults (or null)
for the omitted values (presumably col2, col4 in this case).

Dennis Lovelady
http://www.linkedin.com/in/dennislovelady
--
"Get your facts first, and then you can distort them as much as you please."
-- Mark Twain

> That RPG is using it's own way of initializing the date column in my
> example
> to the value '0001-01-01' (ISO format), i.e. ignoring the DB2 default,
> is
> one issue, yes.
>
> But my primary question is how you get a default value to be written at
> all
> when you don't have a write opcode that implicitly handles this for you?
> Using the C runtime's _Rwrite in move mode one has to specify a full
> record
> and if you don't have a valid date in the appropriate place it doesn't
> compile. Is there another way beyond the LF/View solution?
>
> Best wishes,
> Erik
>
> 2010/9/16 M. Lazarus <mlazarus@xxxxxxxx>
>
> > Erik,
> >
> > Create a LF over the PF, specifying the fields in the file. The
> > trick is to OMIT the fields you want DB2 to automatically initialize,
> > so RPG doesn't use its own rules to populate those fields. If this
> > case, just include the GRPNAME and CUSER fields.
> >
> > -mark
> >
> > At 9/16/2010 09:51 AM, you wrote:
> > >Here's one using ROWID and a date column:
> > >
> > >CREATE TABLE STEO01/TEMPTEST (
> > > GRPID SMALLINT GENERATED ALWAYS AS IDENTITY (
> > > START WITH 1 INCREMENT BY 1
> > > NO MINVALUE NO MAXVALUE
> > > NO CYCLE NO ORDER
> > > CACHE 20 )
> > > ,
> > > GRPNAME CHAR(25) CCSID 278 NOT NULL DEFAULT '' ,
> > > CUSER CHAR(10) CCSID 278 NOT NULL DEFAULT '' ,
> > > CDATE DATE NOT NULL DEFAULT CURRENT_DATE )
> > > ;
> > >
> > >And here's how I'd code it in RPG (the formatting will be off,
> sorry):
> > >
> > >h option(*nodebugio)
> > >ftemptest uf a e disk rename(temptest: rtemptest)
> > > /free
> > > *inlr = '1';
> > >
> > > grpname = 'xyz';
> > > cuser = 'someone';
> > > write rtemptest;
> > >
> > > return;
> > > /end-free
> > >
> > >I specify writing to two columns and DB2 puts in values for the
> other two
> > >(identity column and date).
> > >Is this behaviour possible to imitate?
> > >
> > >Thank you.
> > >
> > >2010/9/16 <Gene_Gaunt@xxxxxxxxxxxxxxx>
> > >
> > > > Can you post the DDL and an SQL CREATE and an SQL INSERT ?
> > > >
> > > >
> > > >
> > > > From: Erik Olsson <erik.eo.olsson@xxxxxxxxx>
> > > > To: mi400@xxxxxxxxxxxx
> > > > Date: 09/16/2010 08:49 AM
> > > > Subject: [MI400] Write to db containing values defined by
> DB2
> > > > Sent by: mi400-bounces@xxxxxxxxxxxx
> > > >
> > > >
> > > > Hello,
> > > >
> > > > Posted this on the C list but was adviced to try out here as well.
> > > >
> > > > If I have DDL defined tables with columns holding DB2 generated
> values
> > such
> > > > as ROWID, defaults as CURRENT_TIMESTAMP etc - how do I code a
> write to
> > > > columns like that using (the C runtime) _Rwrite (I don't know
> what one
> > > > would
> > > > use in MI)?
> > > >
> > > > That is, is there a way to emulate how an RPG write opcode
> handles the
> > same
> > > > situation?
> > > >
> > > > Best wishes,
> > > > Erik