Duro A relational open-source database library written in C.
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open-source database D language language

Duro Description

A relational open-source database library written in C. Duro is a relational open-source database library written in C. It is based on the principles laid down in the book Databases, Types, and the Relational Model: 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). Here are some key features of "Duro": · Tuples and tables (relvars). · Relational algebra: RENAME, select (restrict), project, EXTEND, JOIN, SEMIJOIN, UNION, INTERSECT, MINUS, SEMIMINUS, 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. · Declarative integrity. · Tcl interface, including support for relational expressions in Tutorial D syntax and operators implemented in Tcl ("stored procedures"). · Simple GUI admin tool. What's New in This Release: · Upgraded to Berkeley DB 4.7. · Duro D/T now supports CASE and constraints. · Added exception handling to Duro D/T. · Dropped first argument of CONNECT. · The return type is now explicitly passed to funtions which implement read-only operators. · Single quotes are now used in data output in Tutorial D form. · If a type is not found, NAME_ERROR is raised instead of NOT_FOUND_ERROR. · Added limited type implementation functionality to Duro D/T. · Added operator GETENV.

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