56 lines
2.1 KiB
Fennel
56 lines
2.1 KiB
Fennel
(local Compiler (require :sqlog.compiler))
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(local sqlite (require :diet-sqlite))
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(local {: SQLITE_ROW} (require :diet-sqlite.codes))
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(local Sqlog {})
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(fn Sqlog.new [self ?dbname]
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(set self.compiler (Compiler))
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(set self.db (sqlite.assert (sqlite.open (or ?dbname ":memory:")))))
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(fn Sqlog.deftable [self name ...] (self:execute (self.compiler:deftable name ...)))
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(fn Sqlog.defrule [self head ...] (self.compiler:defrule head ...))
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(fn Sqlog.defrules [self ...] (self.compiler:defrules ...))
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(fn Sqlog.compile-sql [self analysis]
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(when (= analysis.stmt nil)
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(let [stmt (sqlite.assert (sqlite.prepare self.db analysis.query))]
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(sqlite.bind stmt analysis.constants)
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(set analysis.stmt stmt)))
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analysis)
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(fn Sqlog.execute [self analysis ?collect-results]
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(self:compile-sql analysis)
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(sqlite.reset analysis.stmt)
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(if ?collect-results
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(let [result []]
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(while (= SQLITE_ROW (sqlite.step analysis.stmt))
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(table.insert result (collect [icol expr (ipairs analysis.selection)]
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(match expr
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[:as _ name] name
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_ icol)
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(sqlite.column analysis.stmt icol))))
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result)
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(sqlite.step analysis.stmt)))
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(fn Sqlog.compile-action [self action]
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(self:compile-sql
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(match action
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[:!+ & insert] (self.compiler:insert (table.unpack insert))
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[:literal] (self.compiler:insert action)
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[:!- & delete] (self.compiler:delete (table.unpack delete))
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[:!= & update] (self.compiler:update (table.unpack update)))))
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(fn Sqlog.compile-query [self ...] (self:compile-sql (self.compiler:query ...)))
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(fn Sqlog.specify [self action ...]
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(when (not= action nil)
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(match action
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[:* & rule] (self:defrule (table.unpack rule))
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_ (self:execute (self:compile-action action)))
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(self:specify ...)))
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(fn Sqlog.query [self ...] (self:execute (self:compile-query ...) true))
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(setmetatable Sqlog {:__call (fn [cls ...] (doto (setmetatable {} {:__index cls} ) (: :new ...)))})
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