Takusen: Database library with left-fold interface, for PostgreSQL, Oracle, SQLite, ODBC.
|Versions||0.7, 0.8, 0.8.1, 0.8.2, 0.8.3, 0.8.4, 0.8.5, 0.8.6, 0.8.7|
|Dependencies||base, mtl, old‑time, time [details]|
|Copyright||2003-2007, Alistair Bayley, Oleg Kiselyov|
|Author||Alistair Bayley, Oleg Kiselyov|
|Uploaded||by DonaldStewart at Mon Feb 18 22:50:29 UTC 2008|
|Downloads||4040 total (31 in the last 30 days)|
|Rating||2.0 (votes: 1) [estimated by rule of succession]|
|Status||Docs uploaded by user
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Takusen is a DBMS access library. It has a backend for Oracle on Unix, Linux or Windows via OCI, and a stub to test the library without any database. The infrastructure and the stub let one interface natively with other databases. The distinguished feature of Takusen is processing query results using a left-fold enumerator. The user supplies an iteratee function, which receives rows one-at-a-time from the result-set. The number of the arguments to the iteratee is the number of the columns in the result-set, plus the seed. Each column in the result-set has its own Haskell type. The latter could be a Maybe type if the particular iteratee wishes to process NULLs. The benefits are: more convenient and intuitive enumeration, iteration, and accumulation (see tests for examples); the retrieved data are not merely strings but have Haskell types: Int, Float, Date, etc.; buffer preallocation; pre-fetching; support for both enumerators and cursors, proper handling of all errors including various IO errors. No unsafe operations are used.
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