hackageDB :: [Package]

Takusen: Database library with left-fold interface, for PostgreSQL, Oracle, SQLite, ODBC.

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.

Modules

• Control
  • Exception
    • Control.Exception.MonadIO
• Database
  • Database.Enumerator
  • ODBC
    • Database.ODBC.Enumerator
    • Database.ODBC.OdbcFunctions
  • Oracle
    • Database.Oracle.Enumerator
    • Database.Oracle.OCIConstants
    • Database.Oracle.OCIFunctions
  • PostgreSQL
    • Database.PostgreSQL.Enumerator
    • Database.PostgreSQL.PGFunctions
  • Sqlite
    • Database.Sqlite.Enumerator
    • Database.Sqlite.SqliteFunctions
  • Stub
    • Database.Stub.Enumerator
  • Database.Util
• Foreign
  • C
    • Foreign.C.UTF8

Downloads

• Takusen-0.7.tar.gz (Cabal source package)
• package description (included in the package)