Re: BLOB

Thank you very much.

Is this an example of a blob or a datalink?




rbruceh@attglobal.net on 12/09/99 08:31:31 AM
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Subject:        Re: BLOB

-----Original Message-----
From: Rob Berendt <rob@dekko.com>
To: MIDRANGE-L@midrange.com <MIDRANGE-L@midrange.com>
Date: Wednesday, December 08, 1999 5:32 PM
Subject: Re: BLOB


>How about a few lines of code or an SQL statement or something that would
link the two
>
>file
>/drawings/ABC123.bmp
>
>into file mylib/myfile in the record that has a key equal to the prefix of
the file name, ABC123
>and has a datalink or blob or whatever field.
>


SQL:

Create table tablea (keyfield char(6), blobfile blob)
Alter table tablea add primary key (keyfield)

Now COBOL, but you get the idea...
------------------------------------------------------------------------
EXEC SQL begin declare section end-exec.
   01 theFile            usage is sql type is BLOB-FILE.
EXEC SQL end declare section end-exec.

move  "/drawings/ABC123.bmp" to theFile-name
move 20 to theFile-name-length
move SQL-FILE-READ to theFile-file-options

EXEC SQL insert into tablea (keyfield, blobfile) values (:key, :theFile)
end-exec.

move SQL-FILE-OVERWRITE to theFile-file-options
EXEC SQL select blobfile into :theFile from tablea where keyfield = 'ABC123'
end-exec.

-----------------------------------------------------------------------

In RPG I think the SQL type def is something like:
D theFile         S           SQLTYPE(CLOB_FILE)

-----------------------------------------------------------------------
These actions will transfer the file into and out of the blob field.
Alternatively, if you can declare a field large enough in the language you
are using, you could read the file into the field, put the field in the file
and select the value out of the file and into the field. The BLOB-FILE type
allows this to happen at the database manager level without writing code.

===========================================================
R. Bruce Hoffman, Jr.
 -- IBM Certified AS/400 Professional System Administrator
 -- IBM Certified AS/400 Professional Network Administrator

"The sum of all human knowledge is a fixed constant.
    It's the population that keeps growing!"



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