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Replace a particular record in file

 
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surya anem

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Joined: 20 Dec 2007
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Location: Hyderabad

PostPosted: Tue Apr 29, 2008 4:15 pm    Post subject: Replace a particular record in file
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Hi,
I have a set of records(say 100) in a file which are displayed in panels for the user to view or edit.
if a user edits the 51st record how do i write that particular record into the data file.



with regards,
surya
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enrico-sorichetti

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Joined: 14 Mar 2007
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Location: italy

PostPosted: Tue Apr 29, 2008 4:18 pm    Post subject: Reply to: Replace a particular record in file
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read into a stem all the records,
carry on the updates
rewrite the dataset/member from the stem
there is no way to update a single logical record in a PS datsset
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dbzTHEdinosauer

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PostPosted: Tue Apr 29, 2008 4:19 pm    Post subject:
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your file. What kind of file is it?
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surya anem

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PostPosted: Tue Apr 29, 2008 4:20 pm    Post subject:
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It is a PS file.......(datafile)
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surya anem

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PostPosted: Tue Apr 29, 2008 4:21 pm    Post subject:
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Hi
if i have some millions of records and if i have updated just one field of one record..do i have to update all the records

thanks
surya
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enrico-sorichetti

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PostPosted: Tue Apr 29, 2008 4:22 pm    Post subject: Reply to: Replace a particular record in file
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yes,

You will not be updating all the records
You will copy from the input dataset to the output dataset..

thats the basic rule of sequential dataset processing
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superk

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Joined: 26 Apr 2004
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PostPosted: Tue Apr 29, 2008 5:26 pm    Post subject: Reply to: Replace a particular record in file
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I have to double-check this, but I could swear that you can open a dataset and read a single record for update with EXECIO DISKRU, then write the single updated record back with the corresponding EXECIO DISKW, without having to process the entire dataset.
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superk

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PostPosted: Mon May 05, 2008 6:18 pm    Post subject: Reply to: Replace a particular record in file
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I double-checked. You can update a single record. For example, if you have 10,000 records, and you want to update record 5000:

Code:

/* REXX */
"EXECIO 1 DISKRU ddname 5000"
Pull the_record
the_record = "THIS RECORD HAS BEEN CHANGED"
Push the_record
"EXECIO 1 DISKW ddname (FINIS"
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