Re: Working with a BLOB

From: Bill Pribyl <bill_at_datacraft.com>
Date: Wed, 30 May 2001 15:16:37 -0700
Message-ID: <F001.00314B8C.20010530150959@fatcity.com>

> All I need to do is determine
> if a particular string ('.com') pattern exists in the
> column, within the first 75 bytes, and return its
> starting position.

The secret is the built-in DBMS_LOB.INSTR.

Haven't actually run this code, but something along these lines ought to work:

DECLARE
lobloc BLOB;
rawstr RAW := UTL_RAW.CAST_TO_RAW('.com'); /* notice, case sensitive! */

   pos PLS_INTEGER;
BEGIN
   SELECT lobcol INTO lobloc WHERE primary_key = 'whatever';    pos := DBMS_LOB.INSTR(lobloc, rawstr);    IF pos > 0 and pos <= 75
   THEN
      DBMS_OUTPUT.PUT_LINE('found it!');    END IF;
END;
/

http://www.datacraft.com/ http://plnet.org/

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Author: Bill Pribyl
  INET: bill_at_datacraft.com

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Received on Wed May 30 2001 - 17:16:37 CDT