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Concept
Harbour (programming language)
Summary
Harbour is a computer programming language, primarily used to create database/business programs. It is a modernized, open source and cross-platform version of the older Clipper system, which in turn developed from the dBase database market of the 1980s and 1990s.
Harbour code using the same databases can be compiled under a wide variety of platforms, including Microsoft Windows, Linux, Unix variants, several BSD descendants, Mac OS X, MINIX 3, Windows CE, Pocket PC, Symbian, iOS, Android, QNX, VxWorks, OS/2 (including eComStation and ArcaOS), BeOS/Haiku,
AIX and MS-DOS.
The idea of a free software Clipper compiler had been floating around for a long time and the subject has often cropped up in discussion on comp.lang.clipper. Antonio Linares founded the Harbour project and the implementation was started in March 1999. The name "Harbour" was proposed by Linares, it is a play on a Clipper as a type of ship. Harbour is a synonym for port (where ships dock), and Harbour is a port of the Clipper language.
In 2009, Harbour was substantially redesigned, mainly by Viktor Szakáts and Przemyslaw Czerpak.
Harbour extends the Clipper Replaceable Database Drivers (RDD) approach. It offers multiple RDDs such as DBF, DBFNTX, DBFCDX, DBFDBT and DBFFPT. In Harbour multiple RDDs can be used in a single application, and new logical RDDs can be defined by combining other RDDs. The RDD architecture allows for inheritance, so that a given RDD may extend the functionality of other existing RDD(s). Third-party RDDs, like RDDSQL, RDDSIX, RMDBFCDX, Advantage Database Server, and Mediator exemplify some of the RDD architecture features. DBFNTX implementation has almost the same functionality of DBFCDX and RDDSIX. NETIO and LetoDB provide remote access over TCP protocol.
Harbour also offers ODBC support by means of an OOP syntax, and ADO support by means of OLE. MySQL, PostgreSQL, SQLite, Firebird, Oracle are examples of databases which Harbour can connect to.
xBase technologies often are confused with RDBMS software.
Official source
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