Re: Conf: argue !

On 23 Feb 2005 at 0:22, Manuel Holtgrewe wrote:

> > Trees aren't that hard, but I agree that in this case they seem excessive.

Anyway, it is important to remember that the structure of the
config_variables is a hierachy, and multi-dimensional arrays of 
variables must be allowed.

> They are bad and ineffective in SQL because
> 
> - The implementation of the relational model SUCKS
> - There is the need for a generic "EXPLODE" command to get a tree from 
> the table rows (tuples) within the database.

Config_values form a tree. Trees are hierarchies and by-default hard to 
implement in a relational model because they don't adhere to that.
Implementation is ergo a flat table. No harm done.

You don't need an explode at all, though it can be done with that:

From current code of Conf:, method get(path):
$assign='return $this->domains'."['".str_replace('/',"']['",$path)."'];";
return eval($assign);

A similar construction is used to transform the tree (row by row) into an 
multiple associative array. The eval is used too to transform php-
constants and others in raw format into string_values and arrays.

wim niemans








> 
> But we all know that my attitude to SQL is a bit biased ;)
> 
> Manuel
> 
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