[dev] suggestions for database use from new horde app

[Steffen]

Hi,

I'm developing a new Horde app, which hooks shall be able to store 
arbitary data, mostly to record status information from call to call. The 
intended useage is less than 1KB, but I do not have no idea, what can be 
"sane", so the data may become GB in size. It's an admin-supplied value 
after all.

I intend to offer the hooks an API like these snippets sketch:

putData(mixed $data);
$data = getData();

with this implemenation:

putData($data)
  // INSERT / UPDATE data for primary key $user and field hook
  this->lowLevelPut(this->$user, 'hook', serialize($data));

getData()
  return unserialize(this->lowLevelGet(this->$user, 'hook'));

There are no searches, no calculations, no constrains or whatsoever. 
'hook' is the fixed name of the attribute / SQL field name, user is the 
current user. There shall exist one record per user at most, which is 
updated or created by putData().

A SQL table would look like:

CREATE TABLE name (
    owner VARCHAR(..) PRIMARY KEY NOT NULL,
-- ^^ user
    hook TEXT,
-- ^^ unlimited TEXT field the lowLevel functions put into / get from
    ... other fields
);

===========

Is there a documentation, how to get started with databases at a 
Horde-level, so I need not get into the deeps how to write the conf.xml in 
order to allow the admin choose any database backend Horde supports, incl. 
filesystem etc.pp.? Shall I go for RDO (like sesha)?

In fact, I'm currently looking into mnemo's way of accessing the database.

-- 
Steffen