Duro is a relational open-source database library written in C http://duro.sourceforge.net/ . It is based on the principles laid down in the book Foundation for Future Database Systems: The Third Manifesto by C. J. Date and Hugh Darwen.
The goal of the Duro project is to create a library which is as compliant with the proposed database language D as it is possible for a C library. This library is supposed to serve as a basis for a truly relational database management system (TRDBMS).
Duro is published under the terms of the GNU General Public License.
The current release of Duro is 0.9, released 2005-Mar-02. Some features:
- Tuples and tables (relvars).
- Relational algebra: RENAME, select (restrict), project, EXTEND, JOIN, UNION, INTERSECT, MINUS, SUMMARIZE PER, DIVIDEBY PER, WRAP, UNWRAP, GROUP, and UNGROUP.
- Virtual tables (views).
- Locking and nested transactions.
- Duro tables are true sets -- uniqueness of tuples (rows) is always enforced. When creating real tables, at least one candidate key must be supplied. A candidate key may be empty.
- User-defined types (including type constraints) and operators.
- Tcl interface, including support for relational expressions in Tutorial D syntax and operators implemented in Tcl ("stored procedures").
- Simple GUI admin tool.
Category Database