Скачать или смотреть How to Retrieve Data from a Table Using Session ID in CodeIgniter

Learn how to retrieve data in CodeIgniter by utilizing `session ID` with effective database queries. Follow our structured guide to get started!
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How to Retrieve Data from a Table Using Session ID in CodeIgniter

If you are developing an application using CodeIgniter, managing user sessions and retrieving relevant data accordingly is crucial. One common scenario arises when you need to fetch data from a database table using the session ID of the logged-in user. In this guide, we will walk you through the steps required to achieve this, ensuring that you can effectively extract and utilize data within your application.

The Challenge

You may find yourself needing to retrieve user-related data from multiple table entries based on a user’s session. For instance:

Obtain the admin_id from the session.

Use this admin_id to gain access to the roll_id from the user_table.

Finally, leverage that roll_id to fetch the corresponding roll_name from the role_details table.

Example Scenario

Let's break it down with a specific example for clarity. You want to:

Get admin_id from the session.

Access the usertable to find the role_id corresponding to that admin_id.

Use the role_id to extract data from the role_details table.

Step-by-Step Guide

Step 1: Retrieve the admin_id

The first step is to get the admin_id stored in the session. You can do this using the session library in CodeIgniter:

[[See Video to Reveal this Text or Code Snippet]]

This line of code will fetch the admin_id for the currently logged-in user.

Step 2: Get the role_id from the user_table

With the admin_id in hand, you can query the user_table for the corresponding role_id. Here’s how you can execute this:

[[See Video to Reveal this Text or Code Snippet]]

This code queries the usertable and retrieves the role_id linked to the given admin_id.

Step 3: Retrieve the roll_name from the role_details table

Now that you have the role_id, you can use it to extract relevant role information from the role_details table. Here’s how you do it:

[[See Video to Reveal this Text or Code Snippet]]

Code Breakdown

Select Columns: Use $this->db->select('*'); to specify which columns to retrieve from the role_details table.

Table Specification: Indicate which table to pull data from with $this->db->from('role_details');.

Join Tables: Implement the join to associate role_details with user_table based on roll_id.

Apply Filters: Use the where clause to filter records based on admin_id to ensure you only get data relevant to the currently logged-in user.

Execute the Query: Finally, use $this->db->get(); to run the query and capture the data.

With this structured approach, you can efficiently retrieve user roles based on session information in your CodeIgniter application.

Conclusion

By following these simple steps, you can successfully extract data from a table using the session ID in CodeIgniter. This process not only streamlines your application’s data retrieval capabilities but also enhances user experience by providing relevant information dynamically. Should you have more inquiries or require further assistance, don’t hesitate to reach out!