Posts tagged racket

Ideas of a match form for PHP 2017-03-05

This post explore the idea of how would look like if pattern matching would be added to PHP.

And by pattern matching i actually mean racket’s match form.

exploring typecheking sql query in typed/racket 2016-01-09

This post will describe a POC on how to typecheck sql query in typed/racket.

The goal is to make this typecheck:

(: some-query : (Listof (Vector String String)))
(define some-query
  (query
   movies
   #:from     ([actor a] [movie m])
   #:where    (= a.name "Jhon Wayne")
   #:select   (a.name m.name)))

With the schema defined as:

(define-schema movies
  (actor    [id Integer]
            [name String])
  (movie    [id Integer]
            [name String]
            [director_id Integer])
  (director [id Integer]
            [name String]))

Mapping data from sql result to struct 2015-07-06

This post describe the implementation of a descriptive macro to fill structures from sql result.

The goal

At end of this post we will archive this:

;; assume the table actor exist and have at least id, name, age

(struct actor ([id #:auto] [name #:auto] [age #:auto]) 
  #:transparent #:mutable #:auto-value #f)

(select
    (["id" actor id]
     ["name" actor name]
     ["age" actor age])
  "SELECT a.* FROM actor AS a where a.id = $1"
  12)
;; => '(((actor 12 "some name" 80)))

basic fastcgi with racket 2015-06-02

The objective is to implement the most basic working fastcgi protocol in pure racket.

How it works

The minimal fastcgi implementation will look like:

wait on a tcp connection
read all input data
write output hello world like data
close connection