Project Report of Electricity Billing System Page 1

Brief Introduction about RDBSM : 
A relational database management system (RDBMS) is a database management 
system (DBMS) that is based on the relational model as invented by E. F. Codd, of 
IBM's San Jose Research Laboratory. Many popular databases currently in use are 
based on the relational database model. 
RDBMSs have become a predominant choice for the storage of information in new 
databases used for financial records, manufacturing and logistical information, 
personnel data, and much more since the 1980s. Relational databases have often 
replaced legacy hierarchical databases and network databases because they are easier 
to understand and use. However, relational databases have been challenged by object 
databases, which were introduced in an attempt to address the object-relational 
impedance mismatch in relational database, and XML databases. 

---

Project Report of Electricity Billing System 
 
Page - 17 
Implementation Methodology: 
Model View Controller or MVC as it is popularly called, is a software design pattern for 
developing web applications. A Model View Controller pattern is made up of the 
following three parts: 

Model
- The lowest level of the pattern which is responsible for maintaining data. 

View 
- This is responsible for displaying all or a portion of the data to the user. 

Controller
- Software Code that controls the interactions between the Model and 
View. 
MVC is popular as it isolates the application logic from the user interface layer and 
supports separation of concerns. Here the Controller receives all requests for the 
application and then works with the Model to prepare any data needed by the View. The 
View then uses the data prepared by the Controller to generate a final presentable 
response. The MVC abstraction can be graphically represented as follows.