CRUD (Create, Read, Update, Delete) describes the four functions critical to implementing a storage application (Soni, 2018). These functions work on a persistent storage where data can be permanently stored, such as a hard disk or solid-state device. Many organizations that collect, store, and retrieve data, such as financial records, customer information, and employee credentials, among others, need persistent storage devices and applications to help them manage this information. The data is organized into a database for easy storage and retrieval. A rational database is the most common type of database implemented in many organizations, and the CRUD functions are well suited to work in this database type (Soni, 2018). These rational databases correlate with several database applications, such as MySQL, in carrying out the four fundamental functions.
Users utilize the four CRUD functions to manage information in the databases. A user calls the create function to add a new record in the database. In MySQL, a user evokes the INSERT function to create a new record. Organizations employ different measures to safeguard against data breaches and unnecessary data modification. In such cases, users can insert data into the database, but only administrators can make adjustments. For instance, an administrator can add a new customer name into a table named Customers using the following INSERT command
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INSERT INTO Customers (Name, Address, Tel_No, Postal Code)
VALUES (‘Tom Richards’ , ‘Skagen 21’ , ‘452-542-135’ . ‘4007’)
The read function has similar characteristics as the search function, where a user can write a statement to retrieve specific data from the database. In MySQL, the SELECT From function allows a user to retrieve information. Using the above customer database, a user can request to retrieve all customers whose last name is Richards.
SELECT * From Customers WHERE LastName= ‘Richards’
The update and delete functions are used to make changes in the database, whether it is modifying values within the table or deleting values from the table. To modify a record, first retrieve the information from the database using the read function.
SELECT * From employees WHERE email= ‘tom.richards@gmail.com’
Once the email has been selected and retrieved, modify the email address as follows:
UPDATE Customers
SET email= ‘richards.tom@yahoo.com’ WHERE Name= ‘Tom’
On the other hand, the delete function works as follows:
DELETE * From Customers WHERE Name=' Courtney'
The above function will delete Courtney's details from the table.
Reference
Soni, S. (2018). Get started with CRUD operations in PHP MySQL databases . Code Envato Tuts+. https://code.tutsplus.com/tutorials/how-to-work-with-mysql-in-php--cms-32222
