Sequential read after random read.. Possible.. or not

Pollyannaish · Posted: Thu Mar 30, 2006 1:45 pm

Can I read a file sequentially once I have read a record randomly?

thanooz · New User Joined: 28 Jun 2005 Posts: 99

hi Pollyannaish,

I am not geting explain clearly,i am expecting you r asking i had read a file sequentialy once after do you want to access record randamly or not?

thank's
thanooz.

Pollyannaish · Posted: Thu Mar 30, 2006 2:03 pm

Sorry for the Vague Question,
OK I'll normalize the flow?

1. I have read a record randomly with a given key.
2. I want to read 2 records below it and two records above it.

I just wanted to know can this be done without pointing( start brows) logic.
can i read the file randomly first with the key and then do read next or read previous.

Rupesh.Kothari · Member of the Month Joined: 27 Apr 2005 Posts: 463

Hi,

elonics · New User Joined: 05 Jul 2005 Posts: 49 Location: India

I think you can read a one record randomly and start reading it sequentially when it's access mode is Dynamic. So we definitely need START command for that.

As Rupesh said, I dont think one can read a file randomly if it's access mode is Sequential.

Thanks
E'lonics.
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I may be the best or atleast better than many but never worst.

elonics · New User Joined: 05 Jul 2005 Posts: 49 Location: India

Rupesh said it key sequential. then it is ok..
I misread that.

Thanks
Elonics..

Visvanathan · New User Joined: 25 Apr 2006 Posts: 5 Location: India

ajayvamsi · New User Joined: 21 Jul 2005 Posts: 56 Location: Hyderabad

Hi,
u can read the file randomly and from THAT POINT u can read seq
only that matters is, we cannot read the records that are above the record which u have read randomly..!!
Ex:
111
222
333
444
555

in the above input file I read 333 record randomly then we will not be able to read 111,222 records but we will be able to read 444 and 555 sequentially..!!
To read the file sequentially u need not to move any value
to the key field

anyone correct me if I am wrong

Thanks,
ajay

pawaria · New User Joined: 06 Apr 2006 Posts: 7 Location: Noida

Yes Ajay was right! It is possible to read the file sequientally in random access mode But u cannot read the records once your control pass them...U can read post-record but not pre-records