Object/Relational wrappers are a tool for bridging the gap between object-oriented applications and database systems. O/R wrappers encapsulate database access in application-oriented wrapper objects. Applications use these special objects for all access to database entities.
There are a number of tools for generating O/R wrappers, including the Java Data Objects (JDO) initiative. In practice however, wrapper objects are often coded by the application developer. With the advent of Relational DBMSs supporting user-defined objects in the database, this task has become much easier. Creation of wrapper objects can take place in the DBMS before passing them to the client.
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