Map objects to a relational database? , JAVA Programming

Assignment Help:

Due to impedance mismatch between relational technology and object you need to understand the progress of mapping classes (objects) and their relationships to tables and relationships between them in a database. Classes show both behavior and data whereas relational database tables just insert data. Database schemas have keys whereas object schema does not have keys and instead use instance references to implement relationships to other objects.

 

858_Relational Database.png

 

1. Classes map to tables in a way but not directly.

2. An attribute of a class may be mapped to zero or more columns in a database. Not all attributes are consistent.

3. Some attributes of an object are objects itself. This is a recursive relationship where at some point the attribute will be mapped to more columns or zero.

4. In its simple form an attribute maps to a single column whereas each has similar type. When you prepare mapping with different kinds then you will use to be able to convert them back and forth.

 


Related Discussions:- Map objects to a relational database?

What do you mean by auto wiring, The Spring container is able to autowire r...

The Spring container is able to autowire relationships among collaborating beans. This means that it is possible to automatically let Spring resolve collaborators (other beans) for

Continue statement in javascript, It terminates execution of the block of s...

It terminates execution of the block of statements in while or for loop & continues execution of the loop along with the next iteration. On the contrary to the break statement, con

In which way java says write once run anywhere, Java says write once, run ...

Java says write once, run anywhere . In which ways this isn't quite applicable ?

What is an advice, Advice is the execution of an aspect. It is something li...

Advice is the execution of an aspect. It is something like telling your application of a new behavior. Generally, and advice is inserted into an application at joinpoints

Game of life, Conway's Game of Life is a "cellular automaton" that is playe...

Conway's Game of Life is a "cellular automaton" that is played on a 2D grid (array) of cells. At the start of the game, an initial configuration is set up in which a number of cell

What should be public and private, What should be public? What should be pr...

What should be public? What should be private? As a rule of thumb: Classes are public. Fields are private. Constructors are public. Getter and setter methods

What is bean factory, A BeanFactory is like a factory class that having a c...

A BeanFactory is like a factory class that having a collection of beans. The BeanFactory holds Bean Definitions of multiple beans within itself and then instantiates the bean whene

Student, short Java application that stores words in an Array or ArrayList....

short Java application that stores words in an Array or ArrayList.

What does a simple spring application contain, These applications are like ...

These applications are like any Java application. They are made up of not many classes, each performing a particular purpose within the application. But these classes are configure

Alreadyboundexception thrown and by which method, When is AlreadyBoundExcep...

When is AlreadyBoundException thrown and by which method? Ans) AlreadyBoundException is thrown by bind(String name) method when a remote object is already registered with the re

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd