I have a table, let's call it attachments.
I have an attachment id and the attachment filedata. However, unfortunately, when the files are uploaded, the size of the file is never put into a filesize field.....so I have a bit of a predicament.
Is there a way I could do a query to calculate the size of a. a files size in megabytes and b. to get the total size of all files.
Furthemore, I'm also aware that if I have a huge number of attachments then it'd be a slow query. So I'll be caching the query result in my webapp. (refresh every 30mins or so via a cron)
Any help would be hugely appreciated.
Thanks!
For those interested, I found the solution:
create or replace function filesize_in_mb(filedata in blob) return float is
Result float;
begin
select ROUND(((dbms_lob.getlength(filedata)/1024/1024) * 2), 2)
into Result
from dual;
return Result;
end filesize_in_mb;
I'm multiplying by two because the database i'm working with is in utf-16.
And to call it:
SELECT filesize_in_mb(a.filedata) as filesize FROM file_attachment a
All rather simple really! :-)
Hope this might help you -
http://www.java2s.com/Code/Oracle/System-Packages/ThisblockdemonstratesDBMSLOBGETLENGTH.htm
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