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tests/rdb.sx shows the library as a small Datalog engine over fact tables. Each table is an SX list of tuples, wrapped by a relation that does (membero (list ...) table). Queries compose selection, projection, and joins entirely in run* / fresh / conde / membero / intarith / nafc. Five queries: dept filter, salary > threshold, employee-project join, intersection (engineers on a specific project), anyone on multiple distinct projects. 5 new tests, 336/336 cumulative.
91 lines
2.2 KiB
Plaintext
91 lines
2.2 KiB
Plaintext
;; lib/minikanren/tests/rdb.sx — relational database queries.
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;;
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;; Demonstrates how miniKanren can serve as a Datalog-style query engine
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;; over fact tables. Tables are SX lists of tuples; the relation just
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;; wraps `membero` over the table.
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(define
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rdb-employees
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(list
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(list "alice" "engineering" 100000)
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(list "bob" "marketing" 80000)
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(list "carol" "engineering" 90000)
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(list "dave" "engineering" 85000)
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(list "eve" "sales" 75000)))
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(define
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rdb-projects
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(list
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(list "alice" "compiler")
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(list "carol" "compiler")
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(list "dave" "runtime")
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(list "alice" "runtime")
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(list "eve" "outreach")))
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;; Relation views over the tables.
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(define
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employees
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(fn (name dept salary) (membero (list name dept salary) rdb-employees)))
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(define
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on-project
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(fn (name project) (membero (list name project) rdb-projects)))
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;; --- queries ---
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(mk-test
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"rdb-engineering-staff"
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(let
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((res (run* q (fresh (n s) (employees n "engineering" s) (== q n)))))
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(and
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(= (len res) 3)
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(and
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(some (fn (n) (= n "alice")) res)
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(and
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(some (fn (n) (= n "carol")) res)
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(some (fn (n) (= n "dave")) res)))))
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true)
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(mk-test
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"rdb-high-salary"
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(let
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((res (run* q (fresh (n d s) (employees n d s) (lto-i 85000 s) (== q (list n s))))))
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(and
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(= (len res) 2)
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(and
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(some (fn (r) (= r (list "alice" 100000))) res)
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(some (fn (r) (= r (list "carol" 90000))) res))))
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true)
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(mk-test
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"rdb-join-employee-project"
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(let
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((res (run* q (fresh (n d s) (employees n d s) (on-project n "compiler") (== q n)))))
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(and
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(= (len res) 2)
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(and
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(some (fn (n) (= n "alice")) res)
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(some (fn (n) (= n "carol")) res))))
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true)
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(mk-test
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"rdb-engineers-on-runtime"
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(let
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((res (run* q (fresh (n s) (employees n "engineering" s) (on-project n "runtime") (== q n)))))
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(and
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(= (len res) 2)
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(and
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(some (fn (n) (= n "alice")) res)
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(some (fn (n) (= n "dave")) res))))
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true)
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(mk-test
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"rdb-people-on-multiple-projects"
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(let
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((res (run* q (fresh (n p1 p2) (on-project n p1) (on-project n p2) (nafc (== p1 p2)) (== q n)))))
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(some (fn (n) (= n "alice")) res))
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true)
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(mk-tests-run!)
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