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In web development, managing database tables by truncating or emptying them is often necessary for data maintenance, testing, or resetting purposes. In CodeIgniter 4, performing operations to truncate or empty tables enables developers to efficiently reset or clear table data as needed.

In this tutorial, we’ll see the comprehensive methods of truncating or emptying tables using CodeIgniter 4. These functionalities empower developers to reset table data, ensuring a clean slate for new data insertion or testing scenarios.

The TRUNCATE statement in MySQL removes the complete data without removing its structure. It is a part of DDL or data definition language command. Generally, we use this command when we want to delete an entire data from a table without removing the table structure.

Let’s get started.

CodeIgniter 4 Installation

To create a CodeIgniter 4 setup run this given command into your shell or terminal. Please make sure composer should be installed.

composer create-project codeigniter4/appstarter codeigniter-4

Assuming you have successfully installed application into your local system.

Environment (.env) Setup

When we install CodeIgniter 4, we will have env file at root. To use the environment variables means using variables at global scope we need to do env to .env

Either we can do via renaming file as simple as that. Also we can do by terminal command.

Open project in terminal

cp env .env

Above command will create a copy of env file to .env file. Now we are ready to use environment variables.

Enable Development Mode

CodeIgniter starts up in production mode by default. You need to make it in development mode to see any error if you are working with application.

Open .env file from root.

# CI_ENVIRONMENT = production

 // Do it to 
 
CI_ENVIRONMENT = development

Now application is in development mode.

Truncate Methods

In CodeIgniter 4, query execution process includes

Raw Query
Query Builder Class
Model Based Query

We will see truncate methods in each case when we work.

Database Connect

$db = db_connect();

OR

$db = \Config\Database::connect();

Using Raw Query

Truncate Method using raw query as –

$db->query("TRUNCATE TABLE <table_name>");

OR

$db->query("TRUNCATE <table_name>");

Example

$db->query("TRUNCATE TABLE countries");

OR

$db->query("TRUNCATE countries");

Using Query Builder Class

$builder = $db->table('users');

$builder->truncate(); 

OR 

$builder->emptyTable();

Using Model Based Concept

Suppose we have a model as CountryModel.

$object = new CountryModel();

$object->truncate();

OR 

$object->emptyTable();

All these above methods help you to truncate your database table.

That’s it.

We hope this article helped you to learn about CodeIgniter 4 Truncate/Empty Table Methods Tutorial in a very detailed way.

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