Object Relational Mapping  


Object Relational Mapping  

Object Relational Mapping (ORM) is one of those terms that can sound intimidating to a programming beginner. The term “ORM” refers to objects that link a programming language‘s database systems with the ability to apply principles from object-oriented programming and SQL. The wonderful thing about ORMs is that they really make writing code easier when you get the hang of them. 

What is an ORM?

Object Relational Mapping bridges the gap between databases and object-oriented programming. ORM provides object-oriented tools to execute commands that you would normally execute on databases. It hides the intricate details of the databases and allows you to change them using the programming language of your choice.

The format of object-oriented programming is difficult to comprehend and grasp since it contains numerous states and codes. To assist developers in comprehending the underlying database structure, ORMs translate this data and produce a structured map. The mapping explains the connections between objects and various tables. 

In response to updates the application makes to the data object, ORMs use this information to translate data between tables and create the SQL code for a relational database to add, update, generate, and delete data. The conversion of data from a relational database to modelling in programming that is more easily used by code is done using object-relational mapping ASP Net. 

You won’t need to create any more low-level code because ORM mapping will cover the application’s data requirements once it is written.

How to Use Object Relational Mapping

ORM is used to create high levels of abstraction to develop an object-oriented program. In other words, it generates a level of reasoning without relying on the specifics of the code’s foundation.

Without knowing the data’s structure, mapping explains the connection between an object and the data. The SQL code required to manage data activities can then be connected to the application via the model. The developer can save a lot of time by not having to rewrite this type of “plumbing” code completely.

The ability to create Python code rather than SQL can hasten the development of web applications, especially early on in a project. Not having to transition from Python code to creating declarative paradigm SQL statements could speed up development. Even though some programmers don’t mind moving between languages, creating a prototype or launching a web application using just one language is often simpler.

Theoretically, switching an application across different relational databases is also made easy by ORMs. For instance, a developer might use MySQL for production and SQLite for local development. A production application might transition from MySQL to PostgreSQL with only minor code changes.

When to Use ORM?

Every application of ORM can be visually divided into two sections: the write model and the read model. To carry out such a separation, canonical CQRS is not required. Just think back to the activities in your code base that modify database data somehow and the actions that just provide database data to the client. Your write model would be the first, and your read model the second.

The key is that ORMs are only used with write models. They excel at performing OLTP operations, maintaining your domain model, and changing data. Leave it to SQL or a lightweight ORM instead of attempting to leverage ORMs in the read model.

Key Benefits of ORM 

Here are the common benefits of using ORM: 


A standard application often has a sizable part of data access code, and the time required to write such code might require a significant portion of the overall development time. The amount of code is unlikely to be decreased when using an ORM tool—in fact, it might even increase—but the ORM tool produces the entire data access code automatically based on the data model you specify in just a few seconds.


Developers frequently employ ORM because of its simplicity in managing database queries. The developer must first write codes and queries using compatible and preferred programming languages. The written code snippet could be difficult to update and might not support older operating systems. ORM can be employed to retain the code’s fluency in order to write any OOP language.

Additionally, ORM can minimise the codebase’s complexity when many SQL queries are used to access the database. Other developers benefit from being able to recognise and comprehend the code. As a result, application maintenance is simpler and quicker than it was in the earlier stage.

Application Design

An effective ORM tool created by highly skilled software architects will include design patterns that practically require you to apply sound programming conventions in an application. As a result, application layer development can proceed concurrently and in parallel with clear concern separation and autonomous development.

Code Reuse

The data objects can be used in numerous apps if you construct a class library to produce a separate DLL for ORM-generated data access code. This eliminates the requirement for any data access code in any of the apps that utilise the class library.

Maintaining Application

You generally don’t need to bother about testing the code extensively because all of the code created by the ORM is presumably well-tested. Obviously, you must ensure that the code fulfils your requirements, but an ORM that is widely used is likely to have code that many engineers of all levels have contributed to. Long-term changes to the model definition or database schema won’t have an impact on how the application utilises the data objects.

What Is the Difference Between ORM and SQL? 

Object relational mapping allows users to interact with databases using their chosen programming language instead of using SQL. 

Object-relational mappers are a class of tools available to developers. Without utilising SQL, they provide the data in a structured manner that assists users in comprehending the structure and content of a database. One of the main advantages is that it saves time compared to typing SQL queries.

The length of SQL queries that must be entered grows as people’s interactions with data get more complicated. The possibility of mistakes is increased by this fact. Since there are numerous ways to formulate questions and achieve the same outcome, things also become more challenging.

An object-relational mapper functions as a translator, changing the format of code. The program builds virtual maps of the database as objects. Instead of interacting with code directly, the customer can then interact with the objects.

The information must be protected while it is in use, in transit, and at rest. Attacks using SQL injection make it possible for bad actors to alter stored data. Many factors, including outdated or flawed code, can increase the likelihood of these accidents. One best practice for avoiding SQL injection attacks is to use parameterised queries.

Some types of queries are parameterised by default in many ORM systems. They are able to stop some SQL attacks as a result. Although it cannot completely prevent them, using an ORM helps lessen their likelihood.


ORMs can keep code bases from being disjointed and significantly reduce development time. If you need to map more ‘computed’ properties, ORMs can be extremely helpful. Additionally, model updates can be seen in an application, making it highly helpful for additional data manipulation or setting off events in response to data changes.

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