solentware-base 4.0

Bitmapped record number databases using Python interfaces to Berkeley DB, SQLite, and DPT.

Contents

• Description

• Installation Instructions

Description

A record number database is seen as a set of fixed size segments, and an existence bitmap is associated with each segment which contains any records. The idea is from Model 204 (Rocket Software).

Where an index value refers to many records in a segment these references are encoded as a bitmap or a list of record numbers, in a single <index value> : <bitmap or list> record, rather than as many <index value> : <record number> records. When ‘many’ is small a list is favoured to save the space needed for large numbers of unset bits.

The interfaces provided by the apsw, bitbase, bsddb, bsddb3, dptdb, and sqlite3, Python modules are supported.

Installation Instructions

Install the package by typing

python setup.py install

at the command prompt with setup.py in the current directory.

You may need to give the path and version of Python depending on your system’s configuration:

<path to python>/python<version> setup.py install

For example

C:\Python36\python setup.py install

on Microsoft Windows or

python3.6 setup.py install

on Unix-like systems.

Use Python 3.6 or later.