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Home -> Community -> Mailing Lists -> Oracle-L -> 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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