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Ilavenil
New User
Joined: 16 May 2018
Posts: 4
Location: India
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Hello All,
I wish to understand more about the EXECIO read parameter OPEN. The manual says that EXECIO will open the dataset and place the cursor based upon linenum parameter. I tried the following statements
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"EXECIO 3 DISKR INDD (SKIP"
"EXECIO 1 DISKR INDD (FINIS"
"EXECIO 1 DISKR INDD 5 (FINIS"
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I was expecting an error, but irrespective of not opening the file explicitly, the file has been opened by EXECIO and the data has been returned!
I can understand about FINIS as if we are not closing the file explicitly, it will affect the concurrent execs that are waiting for the dataset based upon the locks. But I could not figure out the practical significance of OPEN. can anybody advice? |
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Nic Clouston
Global Moderator
Joined: 10 May 2007
Posts: 2455
Location: Hampshire, UK
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| Quote: |
| The manual says that EXECIO will open the dataset and place the cursor |
No it does not. The manual says
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| if you also specify a non-zero value for the linenum operand, EXECIO sets the current record number to the record number indicated by the linenum operand. |
No mention of a cursor.
You use OPEN to explicity open the data set - good programming practice - and set the current record number. This is the equivalent of SKIP on the FIRST (only) access to the data set. |
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Willy Jensen
Active Member
Joined: 01 Sep 2015
Posts: 712
Location: Denmark
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EXECIO will do an implicit OPEN if the dataset is not already opened. So what you do is not an error.
You will get records 4 and 5 returned in the stack. |
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