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For example, if a client application wanted to monitor the state of 1024 database entries it would take 1024 entity bean references and thus 1024 RMI connections to the EJB server, the EJB server would in turn need to support all 1024 connections from each client application, and would be limited to serving at most 64 client applications at ...
The result of an SQL query is a set of rows with a fixed number of columns. The result of an EJB QL query is either a single object, a collection of entity objects of a given type, or a collection of values retrieved from CMP fields. One has to understand the data model of enterprise beans in order to write effective queries. [3]
Jakarta Enterprise Beans (EJB) specification defines a set of lightweight APIs that an object container (the EJB container) will support in order to provide transactions (using JTA), remote procedure calls (using RMI or RMI-IIOP), concurrency control, dependency injection and access control for business objects. This package contains the ...
A name can be any string such as "com.example.ejb.MyBean". A name can also be an object that implements the Name interface; however, a string is the most common way to name an object. A name is bound to an object in the directory by storing either the object or a reference to the object in the directory service identified by the name.
EJB timer service (new): Event-based mechanism for invoking EJBs at specific times. Message-driven beans accepts messages from sources other than JMS. Message destinations (the same idea as EJB references, resource references, etc.) has been added. EJB query language (EJB-QL) additions: ORDER BY, AVG, MIN, MAX, SUM, COUNT, and MOD.
The SQL standard defines embedding of SQL as embedded SQL and the language in which SQL queries are embedded is referred to as the host language. A popular host language is C. Host language C and embedded SQL, for example, is called Pro*C in Oracle and Sybase database management systems, ESQL/C in Informix, and ECPG in the PostgreSQL database ...
However, it is possible to generate the IDL definitions for the involved RMI-IIOP data structures and use these definitions to exercise finer control between RMI-IIOP and CORBA communicating partners. Recent versions of RMI-IIOP derive their servants from the standard Servant class. Hence, it is possible to connect them to a CORBA ORB manually ...
A query language, also known as data query language or database query language (DQL), is a computer language used to make queries in databases and information systems. In database systems, query languages rely on strict theory to retrieve information. [1] A well known example is the Structured Query Language (SQL).