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CRUD: definition and operation

- Reading Time: 2 minutes

Closely linked to digital data management, CRUD is a computer acronym for stored data operations. It encompasses four basic operations for managing the relevance of data and applications: Create, Read, Update and Delete.

The CRUD (Create, Read, Update, Delete) is a fundamental concept in web development and holds significance throughout the field of computer science. What are the functions of a CRUD? How to create one? Let’s take a look in this post.

What are the functions of a CRUD?

The design of an application involves several stages, including:

1. The user interface (Web or Windows).
2. The business logic layer.
3. The data access layer.
4. The data storage layer.

The last two layers communicate directly to perform CRUD operations.

CRUD refers to four fundamental operations for managing any type of data:

– Create (add and insert)
– Read (view, search, list, query, and extract)
– Update (modify and edit)
– Delete (remove)

How do these 4 basic CRUD operations work?

CRUD applications allow you to create, read, update, and delete data.

The create procedure executes the INSERT statement in an SQL database, creating a new record. This can represent user information, tasks, an account, or a post, for example.

The read procedure is an operation that allows users to access and view creations and posts. The search function lets users filter entries they need.

The update procedure allows for modifying existing data. Specifically, the Update function enables users to modify existing data, even in its entirety, as needed.

The delete procedure, as the name suggests, removes a specified row. This function allows users to get rid of an entry in the database or the user interface.

How are CRUD functions performed?

CRUD operations are typically executed based on the programming language environment and may differ between SQL and NoSQL databases (such as HTTP, MongoDB, RESTFul, and Xquery).

For the Create procedure, users use INSERT in SQL and PUT or POST insert for NoSQL databases.

For the Read procedure, users will use SELECT in SQL. In contrast, they may use GET, COPY, MODIFY, RETURN, or HEAD for databases other than SQL.

For the Update procedure, UPDATE is used in SQL databases. For NoSQL databases, functions like PUT, PATCH, REPLACE, or RENAME are employed.

Regarding the Delete procedure, the DELETE function is used to delete an entry in all types of databases, whether SQL or non-SQL.

Note: Besides these operations performed in a database, CRUD can also apply to other functions, including software deletion.

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