Convert simple Inline Code to dynamic (Take Value from the Db)

[Pelvis]

Hello Everybody ...short question:

My Inline code looks as follow:
$cashondelivery_cost = "0.50";
-------
I want to convert this to dynamic, I mean I want to get the value "0.50" from the Db.

The value "0.50" is stored on table "configuration" row called "configuration_value" of the key "CASHONDELIVERY"

Code shown like this but I can not get anything:
$cashondelivery_cost = tep_db_query("SELECT configuration_value from configuration where configuration_key='CASHONDELIVERY' ");

Any Help :-)
Thanks!

[burt]

$cashondelivery_cost = CASHONDELIVERY;

Don't overthink it  

[Pelvis]

Jesus Burt!!!!!!

Thank You!!!!!

[burt]

Anything in the configuration table is "auto loaded" ready to use, so you can just reference the configuration_key directly to get the value of it.