Another alternative is using a relational database system.

create table products (
 prod_id int primary key,
 model_num int );

create table prod_desc (
 prod_id int foreign key,
 desc text );

SELECT desc FROM products p, prod_desc d WHERE p.prod_id = d.prod_id A
+ND p.prod_id = ?;
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However that may be overkill for your purposes, and being no database and sql expert my syntax may not work (I only know mySQL and Access, and neither perfectly).