Through to the analysis and study on J2EE technology and the EJB's programming model, the author designs and realizes this Entity Bean's dynamic manager, which will improve the reliability, expansibility and maintainability of the J2EE-based application system greatly.
Based on the above, the paper focuses on there search of Data Access Object(DAO) and Object relation Mapping(O/R Mapping), Then this thesis studies the many technologies for implementing O/R mapping in Java environment such as JDBC, Enterprise Entity Bean, JDO ( Java Data Object ) and third party O/R mapping tools.
And then discusses and compares the four kinds of object persistence mechanism successively appeared on J2EE platform, which include the Java object serialization, the Entity Bean, the "Session Bean+JDBC" and the "Session Bean+JDO".
Entity Bean is the core component in the SUN ONE Architecture,the performance of entity Bean will di-rectly affect the all performance of Enterprise Application. This paper discusses some rules for tuning entity beans' per-formance,including using CMP ,facilitating database access,design patterns and so on.
This system is built up foundation based on J2EE, fully utilize the advantage of J2EE and adopt Session Bean of J2EE and Entity Bean technology , has realized business logic separated from business datum, have improved systematic stability and expansibility.
This paper first introduces J2EE frame and n-tier model of enterprise application. Then explains how to design every tier and their communication and gives an EJB example to explain how to design an entity bean and its usage.
By the study of Middleware EJB (Enterprise Jave Beans) and t h e development of session beans and entity beans of server port. It was explained that the EJB technology can be used to provide the Beans model for distributed architecture of multi-tier.