Persistent STL Containers

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last updated September 13, 2007

Overview

Persistent C++ containers (map, multimap, set, list, and others) with standard STL interfaces and simple disk-file backup and storage.
The easiest way to add a simple database to your project.
Cross-platform.
Use them just like STL's containers, with only one exception: The constructor takes a filename. (That one sentence is the entire user manual )

Features

• Ultra-simple; these containers don't use mmap(2) memory mapping or other fancy features. These containers were kept simple, to reduce the probability of bugs, and to keep the manual short.
• One added function: save(), which writes the container to its disk file. Call it to save data whenever you anticipate a crash.
• Will compile even on outdated compilers, esp. those without support for class template partial specialization.
• The best containers to use if you're in a hurry and need NO LEARNING CURVE.
• For added speed, I accept online payment (credit card via your PayPal account).

String Database

StringDB is a fast object-oriented database (OODB) using persistent STL. It's single-user, non-relational, non-SQL, and memory-resident.

At last, a database made for C++! StringDB is based on a map<string, string>, where the key values are strings of the form "objectname[.membername[.submembername[...]]]", just like names in C++ and Java.
Unlike relational databases, StringDB has structs, not rows, and just as in Java and JavaScript, you can add new members to any struct at runtime, as needed,
without seeking the permission of your database administrator first, and without the side effect of adding the same members to all objects of the same type.
With StringDB, there is no law saying every row must have the same format (all the same columns).
And unlike the simple map template that C++ provides, a StringDB lets you index multiple fields of your choice for quick lookup.

StringDB gives you features only found in interpreted languages like Java:

1. a namespace of variable names containing zero or more dots;
2. that namespace is extensible at runtime;
3. that namespace is persistent.

A small function library lets you store integers and timestamps as strings.

It doesn't have an SQL interface -- it has a C++ interface.

Caution

Don't try to build one of these at home! Testing it to perfection would take much more than $5 worth of your time.

Pricing

Persistent Containers are provided in one edition:

• Gold Edition: Source Code (.h files); $5 each persistent container template. StringDB is $10. Each template instantiated for all the basic C++ data types (including string, which I find the most useful).

Availability

As of September 13, 2007, the Persistent Containers templates (Gold Edition) are available.

The Product

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Contact

Copyright © 2002-2007  J. E. Brown   all rights reserved.
	
              
Los Alamos, NM  USA          

[Persistent database software by J. E. Brown -- p. 1]