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Home -> Community -> Usenet -> c.d.o.server -> Re: LONG RAW TO BLOB
A copy of this was sent to Patrick Tan <ptan_at_mindspring.com>
(if that email address didn't require changing)
On Mon, 03 Aug 1998 09:15:43 -0400, you wrote:
> need examples of conversion of data from LONG RAW to BLOB in PL/SQL.
>i.e. READ column of
>LONG RAW type and write it to column of BLOB type. Thanks.
>
>
>
>Patrick Tan
You cannot in pl/sql. You can convert a LONG to a CLOB (dbms_sql gives you piecewise access to a long but not a long raw in pl/sql -- you can read 32k of LONG and write 32k of CLOB and since LOBs support piecewise read/write, you can copy the whole thing in pl/sql).
If you are interested, I have a small C program called "unload". You compile this (its in OCI) and give it a query like:
$ ./unload scott/tiger "select LONG_RAW_COLUMN, FILENAME_COLUMN from T where..."
and it will read each row in T and create a file named after the FILENAME_COLUMN and put the contents of the LONG_RAW_COLUMN into that file (so if you have 5 rows in T, you'll get 5 files).
You can then use a procedure such as:
create or replace directory MY_FILES as '/export/home/tkyte/public_html';
declare
l_bfile bfile;
l_blob blob;
begin
insert into blobs values ( 'MyGif', empty_blob() ) return theBlob into l_blob;
l_bfile := bfilename( 'MY_FILES', 'aria.gif' );
dbms_lob.loadfromfile( l_blob, l_bfile, dbms_lob.getlength(l_bfile) );
commit;
end;
/
to load the files into the database -- dbms_lob.loadfromfile will read the binary file in for you.
If you are interested in getting the SOURCE code for unload (makefiles for NT and Unix), see http://govt.us.oracle.com/~oracle/owarepl/doc/dnld.html
Thomas Kyte
tkyte_at_us.oracle.com
Oracle Government
Herndon VA
http://govt.us.oracle.com/ -- downloadable utilities
Anti-Anti Spam Msg: if you want an answer emailed to you, you have to make it easy to get email to you. Any bounced email will be treated the same way i treat SPAM-- I delete it. Received on Tue Aug 04 1998 - 10:29:47 CDT
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