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New From Versant: O/R Mapping Tool for .NET

By Jennifer deJong

December 15, 2004 — Object-relational mapping tools are commonplace in the C++ and Java worlds. And as .NET applications move toward true object orientation, such tools are making their way into the Microsoft camp, too.

The latest company to enter the fray is Versant Corp., which last month announced a technology preview of Open Access .NET (www.versant.com/downloads).

The new offering gives C#, J# and Visual Basic .NET developers an easy way to persist objects into relational databases, said Manish Chandra, vice president of worldwide marketing at the Fremont, Calif., company, which also sells an O/R mapping tool for Java developers.

Open Access .NET, which plugs into Visual Studio, saves them from having to contend with the fundamental incompatibility that arises when “you have objects on one side, and relational tables on the other,” said Chandra. “You could use SQL or [the Microsoft API] ADO.NET to write to the database,” but getting objects to store and retrieve themselves requires the developer to write a lot of custom code and to continually update that code, he said. Promised for January, Open Access works by enhancing the Microsoft Intermediate Language (MSIL) to store and retrieve objects and maintain information about them. It lets the developer visually map an object, such as a customer object, to a set of tables. It also supports caching, in order to speed up data access, Chandra said. Pricing has not yet been determined but is expected to start at US$400 per developer.

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