Re: BLOB HOWTO??

I'm interested by TOAST, and I have asked several questions on the subject...
I haven't tested them yet...

First I thought that the type bytea allows storing of binary data, a BSOB
(Binary Small OBject).
Secondly that by using a binary cursor you have access to the raw data as it
is stored in the database, but not as it is presented in ASCII
Thridly we could use a funtion to retreive parts of columns, something like
mid(column,start,length)
Fourthly we may use the same function for storing data back.

Cheers...
Franck(at)sopac(dot)org

Jan Wieck wrote:

> Olivier PRENANT wrote:
> > Hi Bruce,
> >
> > Any idea when it's due for??
> > I've been thining about writing a user function; But I'll get stuck with
> > permission as a user function is running under the "postgres" or whatever
> > user instead of the calling user.
> >
> > Also, what kind of binary interface are you thinking of??
>
> Something similar to the existing lo_...() functions.
>
> Actually, someone should use the existing large objects to
> deal with binary content. What has to be kept in mind is
>
> 1. You have to cleanup yourself - the existing large objects
> aren't removed automatically if you delete a table row
> referencing to the LO or drop the table.
>
> 2. The existing LOs don't have copy behaviour. So if you
> reference to a LO from one table and do an INSERT ...
> SELECT, just it's OID is copied, not the data (as it
> should be IMHO).
>
> Jan
>
> --
>
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