This post is all about the performance of the “hasql” library and particularly its PostgreSQL back end in comparison to its popular direct competitors: “HDBC” and “postgresql-simple”. Benchmarks What makes Hasql so fast? Benchmarks The source of the PostgreSQL back end comes with a suite of 3 benchmarks. I’ll analyze them one by one. Results parsing In this benchmark a simple SELECT query without
Daniel Waterworth da.waterworth at gmail.com Sun Dec 25 10:30:49 CET 2011 Previous message: [Haskell-cafe] book.realworldhaskell.org is down Next message: [Haskell-cafe] parListChunk problem Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] Hi all, This is what I've been working on recently in my spare time, https://github.com/DanielWaterworth/siege . It's a DBMS written in Haskell, i
I’ve been using HaskellDB in production for about two years. I decided that I’d write a proper, up-to-date description, or tutorial, about what it is, how it works, what it can do, and my experience using it in projects.1What is HaskellDB?HaskellDB is a database interface library for Haskell which featuresexplicit declaration of schema of entities and fields,an EDSL2—a Query monad—for making queri
のようにJSON形式で現在のカウントを返す。 実行される度にDBに登録されているカウンタをインクリメントする。 また、パラメータに「callback=～」がある場合にはJSONPとして返す 分析機能とかはない純粋に訪問者を数えるだけ。 そんなもんにわざわざDB使うなって話もあるけれども、まぁ個人的な練習なのでよし。 で、今回作ったカウンタをzipでまとめたもの→ダウンロード 2: 環境 今回のサーバー環境。 linux MySQL 5系 ghc 6.8.2 で、利用したHaskellのライブラリは以下のとおり。 Network.CGI Database.HDBC Database.HDBC.MySQL Network.CGIはghcなら標準で入ってると思う。 HDBCとHDBC-MySQLはghcでは標準では入ってないので、それぞれインストールする必要がある。 ただし、HDBC-MySQL
A library and program for the creation, management, and installation of schema updates (called migrations) for a relational database. In particular, this package lets the migration author express explicit dependencies between migrations and the management tool automatically installs or reverts migrations accordingly, using transactions for safety. This package is written to support a number of dif
Giles Bowkett: SQL Unnecessary In Haskell's HAppS
Evan Weaver has this idea: SQL is a kludge. It's a weird idea, that SQL isn't necessary in Web apps and doesn't belong in Web apps, but Dave Thomas and Avi Bryant both hinted at it in their RailsConf keynotes, David Heinemeier Hansson basically used it as the base assumption for ActiveRecord, and, according to my roommate Justin, Paul Graham used it as a base assumption as well in the original Lis
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