CORBA 環境上的物件查詢服務

Abstract

The Common Object Request Broker Architecture (CORBA) defined bythe Object Management Group (OMG) has become an emerging industry standardof distributed objects technology. It provides the interconnection busbetween distributed objects and a mechanism to develop platform- and language-independent distributed applications. The Object Query Service (OQS) proposed by OMG defines a very general facility for querying collections of objects. Through OQS, clients can use a simple interface to find objects whoseattributes meet the search criteria specified by a query. The query can be formulated using either SQL query or ODMG's OQL. In thesis, we design and implement the Object Query Service based onCORBA. Our Query Service acts as a middleware to both relational databases and object-oriented databases. Clients are able to issue either SQL query or OQL query, and our OQS will retrieve and translate the results into CORBA objects that have both platform- and language-independent properties. TheseCORBA objects can be passed anywhere on the ORB and they can be shared by different application objects.