Converting the data and storing it in an object database
If you are in a situation where it makes more sense to convert the relational data to the object schema, then the equivalent views discussed earlier
will again be of use. Each of these equivalent views has a corresponding relational view.
See checking the class hierarchy (new
window).
The relational view can be used to access the data in the relational database.
The conversion process, however, will only use the relational views that correspond
with the classes at the bottom of the class hierarchy, the
leaf classes described earlier (new
window). The converted data will be stored in these leaf classes. The classes in the object schema hierarchy above the leaf classes provide alternate ways to view or classify the data that is the equivalent to other views that existed in the relational schema.
To create a conversion program, use the single-valued views (the ones that use only one type code) to get the data from the
relational database and populate object instances for the appropriate leaf class in the object schema managed by the
Object DBMS (ODBMS). The upside of doing this is that you get the integration and performance provided by the ODBMS. The downside is that you will either convert the existing applications to access the ODBMS through an ODBC
or JDBC interface or develop new applications. Many ODBMS products provide ODBC
and JDBC interfaces. This allows the object data to appear as relational data, using the view equivalents that were presented earlier.
DevExpress Announces the Newest Version of Its .NET Business ... Market Wire (press release) - Apr 29, 2008 To learn more about DevExpress business application framework and object-relational mapping tools for .NET, and to download a fully functional evaluation ...
Data-Focused Visual Studio 2008 and .NET 3.5 SP1 Betas Released Redmondmag.com, CA - May 12, 2008 The object relational mapping framework, based on the Entity Data Model, is still a work in progress. Some problems will not be addressed in EF version 1 ...
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Foundation for Object / Relational Databases: The Third Manifesto by C. J. Date, Hugh Darwen Average Customer Review: based on 4 reviews. Customer Review: Mr. Data and Mr. Darwen have much to say in this book. The question is will community of "database" people read it, assimilate it, and get to sufficient mass to discuss the merits of the concepts described in this book? And, if that does happen, will it be too late to implement any of the concepts in a real DBMS? There is no question...
C++ Database Development: Featuring Parody the Persistent Almost-Relational Object Database Management System by Al Stevens Average Customer Review: based on 1 review. Customer Review: Al Stevens, C++ Database Development (MIS Press, 1992) Two questions come to mind as to why anyone would be reading a ten-year-old book on database development in an outdated edition written to cater to an operating system that (almost) no longer exists in any meaningful way. (Or why they would be reading a review of such a book.) Tho...
Database Directions: From Relational to Distributed, Multimedia and Object-Oriented Database Systems by James Larson Average Customer Review: based on 1 review. Customer Review: This book should be renamed as Database Pocket Guide.Good for College students ,who just want to refer to refresh themselves.Good for Database Users whojust want to know little details about Distributed Databases.But for people who are really serious about Distributed Databases, this is not the right choice. A Good one could be "Manag...
based on 4 reviews.
based on 1 review.
