Introducing Object Relational Mapper
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by Uday Denduluri
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What is ORM?

Let us understand the ORM with a help of a figure given below.

As we can see from the figure above that there is a new layer that gets introduced called ORM. This layer acts as a bridge between DAL and database.  It generates SQL queries maps the Objects to the Tables.

ORM – Object Relational Mapper is a package that maps the objects to the relational tables and Tables columns to the object attribute one to one.

Example:  We have an Employee Table with some columns in it.  The figure below shows a business object of type Employee.  It is not mandatory to have the employee declaration as shown below.

The Code written below is in C#.  It typically explains a skeleton of business object.

Listing 1

Class Employee
{
  public ID;
  public Employee Name;
  public Employee Salary;
}

The Employee class created needs to have a metadata that helps the ORM map to the table. There are many ORM packages available that deal with encapsulating the metadata with the class.  We will look at the same in the next section.

Figure 2


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