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Home -> Community -> Mailing Lists -> Oracle-L -> Re: Populating BLOB's from a SQL Script? - Solution
Mark,
I didn't fully understand you're earlier post, but now it seems that the sqlunldr.pl script in the PDBA toolkit may do what you want.
http://www.oreilly.com/catalog/oracleperl/pdbatoolkit/
It will dump blobs to hex in a sqlldr compatible file, along with the control and parameters script to reload with sqlldr.
HTH Jared
"Mark Richard" <mrichard_at_transurban.com.au>
Sent by: ml-errors_at_fatcity.com
10/08/2003 08:09 PM
Please respond to ORACLE-L
To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
cc:
Subject: Re: Populating BLOB's from a SQL Script? - Solution
Ok, I got no suggestions but have found a rather clunky way to achieve this:
Assuming a blob exists in a table somewhere then a statement like "select dbms_lob.substr(data, 1000, 1) from table" can be used to retrieve 1000 bytes worth of data as hex.
For a new field a simple "insert into table (data) values (hextoraw('the_hex_returned_above'));" statement will insert the data in it's original form.
To work with BLOB's larger than 1K a looping process is required. The easiest way I've found to append data is a small pl/sql block:
declare
new_data blob;
begin
select data into new_data from table for update;
dbms_lob.writeappend(new_data, <offset>,
hextoraw('the_hex_returned'));
So, to summarise. It's possible to convert BLOB's to hex, place the results into a basic sql script and have then reloaded into a table. Unfortunately you can only work on 1K of data at a time but a simple program to generate the sql would overcome this problem. Net result = you can deliver binary data via sql scripts would too much hassle.
Hopefully this helps somebody out there.
Regards,
Mark.
"Mark Richard"
<mrichard_at_transur To: Multiple
recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
ban.com.au> cc:
Sent by: Subject: Populating BLOB's
from a SQL Script?
ml-errors_at_fatcity
.com
07/10/2003 12:04
Please respond to
ORACLE-L
Hi List,
I have been asked to look into the possibility of populating a BLOB column
(Oracle 8i currently) using an SQL Script. All the examples I've ever
seen
involve reading the blob from a file and inserting it directly to the
table
though.
The reasoning behind this is the desire to deliver a single script which
loads perhaps 50 images into a table. Performance isn't a problem,
neither
is the size of the script.
Does anyone know of a way to do this? It is safe to assume the data already exists in a table if that helps to create the script. I was thinking perhaps a "rawtohex" type function may convert the binary data into something that can exist within a script. Am I on the right track?
Regards,
Mark.
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-- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Mark Richard INET: mrichard_at_transurban.com.au Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).Received on Thu Oct 09 2003 - 13:39:24 CDT
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