libubiqx is an in-memory database suitable for use in embedded systems. The libubiqx database management system is a fully functional DBMS API that supports both hierarchical and relational data architectures. It provides developers with robust and scalable data management tools for use in embedded systems or SNMP agent applications.
Itzam/C++ wraps the Itzam database engine with C++ templates for both simple and complex database classes. It supports B-tree, hash table, and sparse matrix indexes with unique or duplicate keys, and includes multithreaded resource locking and atomic file transactions. Complete class documentation is embedded in the source code, and available online and in the distribution archive.
Trivial Persist was developed to provide the quickest and easiest means possible to achieve object persistence in Java. It uses neither XML files nor SQL databases, and it uses normal Java classes for access (such as Set, Comparator, and Iterator) rather than JDBC or a new API. As a result, a new object repository (called a Store) can be created or modified in just a few seconds. It is not designed for huge databases. The disk storage format can be manipulated by simple text processing tools.
HDB is a small, flexible, and efficient hybrid database, a mix between a filesystem and a database. It comes with a wide range of command line utilities for manipulating and extracting data. It's designed for both embedded and bigger systems. It currently has interfaces to C, C++, Java, and Perl.
com.webprofusion.util.db.DBConnection is a simple wrapper Java object for JDBC database connections which is meant to help in building cross-DB SQL statements. It currently supports MySQL & MS SQL Server. It also includes the classes com.webprofusion.utils.StringUtils and com.webprofusion.SiteProperties. The dbconnection object currently uses thess classes to load settings for the DB Connection at runtime. This lets you define a properties file which specifies the dbengine and connection info.
jUDO (java Universal Data Objects) speeds up development/maintainence and removes database-vendor dependency for applications using databases. You should use jUDO whenever you don't want to use EJBs. You don't write any database code; you only have to specify the container classes and the interfaces for the models, and then jUDO creates the implementation for you runtime (no source is generated). It derives all info needed from your interfaces method names that follows name-pattern rules. In case you need some special access method, you either add a plugin for this or simply go directly against the database. jUDO is not as configurable and advanced as other much more professional software like Castor, Hibernate, etc., but since jUDO derives the database from your code, there is never a mismatch between code and database.
eDB is a very simple and easy-to-use collection of Perl 5 CGI scripts to perform searches on a flat-file database. Search results are displayed using HTML templates that can be modified to fit the user's needs. Pattern-based searches can be refined by using a range of values of a user-specified field. If desired, search results can be displayed using a paging procedure.