Design and UI Patterns Object models and relational models do not always work very well together....

Design and UI Patterns

Object models and relational models do not always work very well together. Databases represent data in a tabular form, whereas object-oriented languages represent data based on a graph of objects. There are a few common mismatch problems that can exist with association, aggregation, inheritance, and composition, and data navigation.

Given these potential problems, how you would use object-relational mapping to address at least two of these problems?

Expert Solution

The Object-Relational Mapping (ORM) is the solution to handle all the above impedance mismatches.

What is ORM?

ORM stands for Object-Relational Mapping (ORM) is a programming technique for converting data between relational databases and object oriented programming languages such as Java, C#, etc.

An ORM system has the following advantages over plain JDBC −

Sr.No.	Advantages
1	Let’s business code access objects rather than DB tables.
2	Hides details of SQL queries from OO logic.
3	Based on JDBC 'under the hood.'
4	No need to deal with the database implementation.
5	Entities based on business concepts rather than database structure.
6	Transaction management and automatic key generation.
7	Fast development of application.

An ORM solution consists of the following four entities −

Sr.No.	Solutions
1	An API to perform basic CRUD operations on objects of persistent classes.
2	A language or API to specify queries that refer to classes and properties of classes.
3	A configurable facility for specifying mapping metadata.
4	A technique to interact with transactional objects to perform dirty checking, lazy association fetching, and other optimization functions.

venereology answered 3 days ago

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Design and UI Patterns Object models and relational models do not always work very well together....

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