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  Data Modelling

Introduction to Data Modelling (Information Modelling)

Data modelling has already been discussed in chapter 6 of structured analysis.

In the context  or structured analysis data modelling can be  used to represent the contents of data stores and the relationships that exist among  them.  Structured  analysis notation provides no direct mechanism for  representing this relationships. Data modelling does.

As such the concept of data  modelling  is same  in object oriented  approach. In data modelling we focus solely on data to define data objects,  their attributes and their  relationships with each  other which  leads to develop  a data network of the  given  system.  Data  modelling  is useful  and beneficial  for  application  like  complex data base application  in which  data  with their  relationship are required to govern data.

Data  modelling  and some of  its  graphic  notations  are similar to  those used for OOA. But there are  many difference  between  these two approaches:

1. Both  approaches use the  term object. In data modelling  it is referred as data object whereas in objects  oriented  approach it is simply an object. The definition  of  objects is much more limited  in data modelling  context  in comparison to OO approach.

2. Both approaches describe relationship   between  objects  but data  modelling does not  concern itself  with how these relationship are achieved.

3. Data modelling  basically  models  the data  without  concerning  about  the processing  which  transforms  the data. So this approach  should  be associated  with another  modelling  approach which will consider the processing  issue to from a complete requirements  analysis methods.

But  in the OOA it does not  happen. It is  already an  analysis method, to acquire  the complete requirements.

These differences  make  their  concepts  more clear with  respect to their use and applications. Now  we will discuss data objects, their  attributes and relationships and E-R diagrams  one  by one  in  the  following sections.

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