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Re: blob size after pg_lo_open

From: ljb <ljb220(at)mindspring(dot)com>
To: pgsql-php(at)postgresql(dot)org
Subject: Re: blob size after pg_lo_open
Date: 2004-08-12 01:13:21
Message-ID: cfeg7h$1lt7$ (view raw, whole thread or download thread mbox)
Lists: pgsql-php
TDyson(at)sybex(dot)com wrote:
> I have to store some files in a database and let users download the files. 
>   I want to pull the file size so I can use the HTTP Content-length 
> header.  I've tried using PHP's fstat to return the size, but I think the 
> object returned by pg_lo_open is not suitable.

No, you can't use fstat() on a large object handle. If you really need the
large object size, you have to open the large object with pg_lo_open(),
seek to the end with pg_lo_seek($loid, 0, PGSQL_SEEK_END), and then get the
position with pg_lo_tell($loid). This will return the number of bytes in
the large object. But if you find yourself doing this a lot, you might be
better off storing the file size (as calculated when uploaded) in another
field in the database record.

> Any ideas?  BTW, I figured this was a pretty common need, but I could not 
> find a complete widget to deal with it.  The best I could come up with was 
> complete apps, mostly image galleries, and a few code snippets.

I've hardly ever bothered with Content-length. There is probably some
advantage to using it but I don't know what it might be.

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