Syntax for Set based DB
Date: 1 Mar 2007 14:24:08 -0800
Message-ID: <1172787848.094332.202490_at_n33g2000cwc.googlegroups.com>
Comments/suggestions appreciated on syntax for an experimental db based on sets. The sample script creates a db equivalent to an RMDB with the following tables.
T_Person T_Doctor T_Name T_Gender T_Age T_Weight T_Qty T_Unit
Below script creates/queries two things with different typing and attributes. The first is a person/doctor named John who is male, age 75 yr and weight 75 kg. The second is an untyped thing named Mary whose gender is female. Note: lines starting with "(;" are comments. Each expression begins with a function. For example "g" is short for Get. "g+" is short for Get Else Create. Sub expressions that do not specify a function default to that of parent expression.
(; Create a person/doctor named john)
(g+ (type 'person)
(type 'doctor)
(name 'john)
((type 'gender) 'male)
((type 'age) ((type 'qty) '75) ((type 'unit) 'yr))
((type 'weight) 75 (unit 'kg)
(; Create a female thing named mary)
(g+ (name 'mary)
(gender 'female))
(; Get doctors who are 75 yr)
(; Gets john)
(g doctor (75 yr))
(; Get persons whose weight qty is 75 and unit is kg)
(; Gets john)
(g person (weight '75) (unit 'kg))
(; Get things that are female)
(; Gets mary)
(g female)
(; Get things that have a gender)
(; Gets john and mary)
(g (gender))
Received on Thu Mar 01 2007 - 23:24:08 CET