A binding to the tinycdb library by Michael Tokarev, which is a public domain implementation of Daniel J. Bernstein's Constant Database (cdb). A cdb is a key-value store (much like BDB/gdbm), but it cannot be updated at runtime (only rebuilt). Reading is very fast, and rebuilding is done atomically by building the new database and then renaming. lua-tinycdb includes the tinycdb source so there are no external dependencies.
I include below the list some of the features of the cdb database structure, stolen (and slightly modified) from D.J. Bernstein's cdb page:
- Fast lookups: A successful lookup in a large database normally takes just two disk accesses. An unsuccessful lookup takes only one.
- Low overhead: A database uses 2048 bytes, plus 24 bytes per record, plus the space for keys and data.
- Fast atomic database replacement
- lua-tinycdb-0.2 (2008-11-07)
db:pairs(), though for this release
iteris available as an alias.
__tostringon a cdb maker returned no results
- small internal refactoring
- lua-tinycdb-0.1 (2008-01-23)
- first public release
- cdb DJ Bernstein's original implementation
- cdb format specification
- luacdb Taj Khattra's binding to the original cdb library. lua-tinycdb was developed independently.
lua-tinycdb is distributed under the MIT license.
Copyright (c) 2008 A.S. Bradbury Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.