IBM MAINFRAME HELP FORUMS for COBOL, JCL, CICS, DB2, IMS etc...

rakeshvp3 · Joined: 19 May 2008 Posts: 2 Location: bangalore

1. Is it possible to open and close a file in the calling program and to read the records of the file in the called program?

2. A JCL
//SYSIN DD DSN=A.B.C, disp= old
//SYSIN DD DSN=P.Q.R, disp=old
Will it concatenate or not?

3.How many files will be created while creating a table?

4.If two temperory datasets of the form DSN=&WORK and DSN=&&WORK in the job stream , will the system intercept it as a same dataset or different ?

the_gautam · Joined: 05 Jun 2005 Posts: 168 Location: Bangalore

What files are you talking about?
When you create a DB2 table, the table is created under a TABLESPACE.

Quote: DSN=&WORK
The & symbol is used to indicate the symbolic override.

shreevamsi · Joined: 23 Feb 2006 Posts: 320 Location: Hyderabad,India

1. Yes you can open or close a file in a calling program and read or write in a called program

2. Concatination can be done by the following method only.
//SYSIN DD DSN=A.B.C, disp= old
// DD DSN=P.Q.R, disp=old

3. When we create a table, we won;t be explicitly create any files.

4. One is a Symbolic Parm and the other is a Temp dataset. There shouldn't be any problem.[/quote]

expat · Posted: Wed May 28, 2008 11:28 am Post subject:

Quote:
2. A JCL
//SYSIN DD DSN=A.B.C, disp= old
//SYSIN DD DSN=P.Q.R, disp=old
Will it concatenate or not?

3.How many files will be created while creating a table?

2) Not concatenation, probably a JCL error
- should fail on disp= old (space present)

3) What type of table are you creating ?
DB2, ISPF, in storage ???

vasanthkumarhb · Joined: 06 Sep 2007 Posts: 298 Location: Bang,iflex

Hi,

Quote: 1. Is it possible to open and close a file in the calling program and to read the records of the file in the called program?

Ans: If u want read in calling program and move it LIKAGE SECTION LN-REC (record structure) then u can make use of these variable data in called progam.

But according to your question opening and closing in calling program and reading in called program is not possible.

Quote: 2. A JCL
//SYSIN DD DSN=A.B.C, disp= old
//SYSIN DD DSN=P.Q.R, disp=old
Will it concatenate or not?

Ans: No,it wil not concatenate.

Quote: 3.How many files will be created while creating a table?

Ans: Ambigius Question...... :oops:

Quote: 4.If two temperory datasets of the form DSN=&WORK and DSN=&&WORK in the job stream , will the system intercept it as a same dataset or different ?

Ans: & is an symbolic override parameter as suggest before, also && indicates temporary data set, you can make use of it, i guess nothing to worry.

vasanthkumarhb · Joined: 06 Sep 2007 Posts: 298 Location: Bang,iflex

Hi Vamsi

shreevamsi wrote: 1. Yes you can open or close a file in a calling program and read or write in a called program [/quote]

I felt quite intresting to your above answer, please give an example for the above answer.

shreevamsi · Joined: 23 Feb 2006 Posts: 320 Location: Hyderabad,India

Hi Vasanth,

I use an generic program to open or close a particular file. The file holds the details of the No of records processed in the particular run.

The details are captured in the called program.

~Vamsi

gcicchet · Joined: 28 Jul 2006 Posts: 578

Hi,
I know 1 & is not strictly correct but both & and && will give the same temporary dataset name.

Gerry

Douglas Wilder · Joined: 28 Nov 2006 Posts: 188 Location: Deerfield IL

vasanthkumarhb wrote: 1. Yes you can open or close a file in a calling program and read or write in a called program
shreevamsi wrote: I felt quite intresting to your above answer, please give an example for the above answer.

This can be done with an "External" file.
Put the Select and FD statements in both the calling and the called program. The FD in both should contain the word "External".
Then open and close the file in the calling program as normal, and read or write the file as normal in the called program.

vasanthkumarhb · Joined: 06 Sep 2007 Posts: 298 Location: Bang,iflex

Hi,

Quote: The FD in both should contain the word "External".

Now i got the solution, i need to know, how FD can be declared as "EXTERNAL"?

dick scherrer · Joined: 23 Nov 2006 Posts: 8059 Location: 221 B Baker St

Hello,

Start here:http://publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/handheld/Connected/BOOKS/igy3lr10/5.2?

Took about 30 seconds. . . .

d

vasanthkumarhb · Joined: 06 Sep 2007 Posts: 298 Location: Bang,iflex

Hi Dick,

Thank you very much.

dick scherrer · Joined: 23 Nov 2006 Posts: 8059 Location: 221 B Baker St

You're welcome :)

d

jyothimenon1 · Joined: 16 Jul 2008 Posts: 10 Location: bangalore

here what will happen?

I have a doubt regarding open a file in one program and use it in its called program

Consider the scenario where I read 10 records from the file using the main program and if I gave a read in the called program then will I get the 11th record or the first record? (Here Im talking about the case that we are not carrying any key info from the main program to the sub program)

Anuj D. · Joined: 22 Apr 2006 Posts: 1983 Location: Phoenix, AZ

jyothimenon1 wrote: ..I gave a read in the called program then will I get the 11th record or the first record? Do you open it in CALLed program as well..?... :D