66 lines
1.8 KiB
Racket
66 lines
1.8 KiB
Racket
#lang racket/base
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(require racket/class
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"../generic/interfaces.rkt"
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"../generic/common.rkt")
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(provide dbsystem
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classify-sl-sql)
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(define sqlite3-dbsystem%
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(class* object% (dbsystem<%>)
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(define/public (get-short-name) 'sqlite3)
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(define/public (get-known-types) '(any))
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(define/public (has-support? x) #f)
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(define/public (get-parameter-handlers param-typeids)
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(map (lambda (param-typeid) check-param)
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param-typeids))
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(define/public (field-dvecs->typeids dvecs)
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(map (lambda (dvec) (vector-ref dvec 0))
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dvecs))
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(define/public (describe-typeids typeids)
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(map (lambda _ '(#t any #f))
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typeids))
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(super-new)))
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(define dbsystem
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(new sqlite3-dbsystem%))
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;; ========================================
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(define (check-param fsym index param)
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(unless (or (real? param)
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(string? param)
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(bytes? param))
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(error/no-convert fsym "SQLite" "parameter" param))
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param)
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;; ========================================
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;; SQL "parsing"
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;; We just care about detecting commands that affect transaction status.
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;; classify-sl-sql : string [nat] -> symbol/#f
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(define classify-sl-sql
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(make-sql-classifier
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'(;; Statements that do not invalidate the statement cache
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("SELECT" select)
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("INSERT" insert)
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("UPDATE" update)
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("DELETE" delete)
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;; Explicit transaction commands
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("ROLLBACK TRANSACTION TO" rollback-savepoint)
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("ROLLBACK TO" rollback-savepoint)
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("RELEASE" release-savepoint)
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("SAVEPOINT" savepoint)
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;; Note: SAVEPOINT allowed outside of transaction! (but that's okay)
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("BEGIN" start)
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("COMMIT" commit)
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("END" commit)
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("ROLLBACK" rollback) ;; Note: after ROLLBACK TO, etc
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)))
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