USS read MVS datasets
 

Hi,

I am currently trying to write a servlet on websphere running under
USS on ZOS. I want to read some TSO datasets, to compile reports, I
have no problems reading files which reside within the HFS file
structure but would also like to read TSO datasets. What would be the
best way to do this? I do not want to go through other platforms like
CICS or use COBOL programs I want to do it all from the servlet.

Can anyone help by providing some advice on the best means to
achieve this.

Thanks.

Re: USS read MVS datasets
 

Mark wrote:
> Hi,
>
> I am currently trying to write a servlet on websphere running under
> USS on ZOS. I want to read some TSO datasets, to compile reports, I
> have no problems reading files which reside within the HFS file
> structure but would also like to read TSO datasets. What would be the
> best way to do this? I do not want to go through other platforms like
> CICS or use COBOL programs I want to do it all from the servlet.
>
> Can anyone help by providing some advice on the best means to
> achieve this.
>
> Thanks.

I wouldn't try this with Java! Seriously, I had to play around with
some tape datasets (3380) on AIX which was tricky enough. C is a
much better choice, mapping the record struture directly into a C
struct. You still have to mess about with LRECL and BLKSIZE, and
heaven help you if you're using anything other than DSORG=PS and
RECFM=FB.

Re: USS read MVS datasets
 

Sudsy wrote:
> I wouldn't try this with Java! Seriously, I had to play around with
> some tape datasets (3380) on AIX which was tricky enough. C is a
> much better choice, mapping the record struture directly into a C
> struct.


Eeeeeeeeeeeeeeeek!!!

=-O

That sounds waaaay too scary.

Most places I've worked wouldn't even hire you if you liked casting
bytes directly into C structs! And even on the same OS on the same PC a
change by the vendor can break things on you from one compiler version
to the next.

(Hmmmm..... I know. Let's change this type from 80-bit to 64-bit. And
then only mention it down at the bottom of a huge 'readme' text file...)

What you need to do to read in structures in Java is pretty much exactly
what you need to do to have C code that's not as fragile as an empty
eggshell.