#15 Table with CRUD actions

Below is a simple, single-file WordPress plugin that:

✔ Creates database table cdat_students on activation
✔ Displays records in admin menu
✔ Provides CRUD operations (Create, Update, Delete)
✔ Uses dashicons for action icons
✔ Uses standard WordPress sanitization + nonce protection

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✅ Complete Single-File Plugin: cdat-students.php

<?php

/**

 * Plugin Name: CDAT Students Table Creator

 * Description: Creates cdat_students table on activation and displays records with shortcode [show_cdat_students].

 * Version: 1.0

 * Author: RMC  

 */

if (!defined('ABSPATH')) exit;

/*===========================================

  CREATE TABLE ON PLUGIN ACTIVATION

===========================================*/

function cdat_students_create_table() {

    global $wpdb;

    $table = $wpdb->prefix . 'cdat_students';

    $charset = $wpdb->get_charset_collate();

    require_once ABSPATH . 'wp-admin/includes/upgrade.php';

    $sql = "CREATE TABLE $table (

        id INT(11) NOT NULL AUTO_INCREMENT,

        roll VARCHAR(20) NOT NULL,

        name VARCHAR(200) NOT NULL,

        semester INT(2) NOT NULL,

        PRIMARY KEY (id)

    ) $charset;";

    dbDelta($sql);

    // Insert sample data only if table empty

    $count = $wpdb->get_var("SELECT COUNT(*) FROM $table");

    if ($count == 0) {

        $wpdb->insert($table, array('roll' => '101', 'name' => 'John Doe', 'semester' => 1));

        $wpdb->insert($table, array('roll' => '102', 'name' => 'Arun Kumar', 'semester' => 1));

        $wpdb->insert($table, array('roll' => '103', 'name' => 'Priya Sharma', 'semester' => 2));

        $wpdb->insert($table, array('roll' => '104', 'name' => 'Maria L', 'semester' => 2));

    }

}

register_activation_hook(__FILE__, 'cdat_students_create_table');

/*===========================================

  SHORTCODE TO DISPLAY STUDENT TABLE

===========================================*/

function cdat_students_display_shortcode() {

    global $wpdb;

    $table = $wpdb->prefix . 'cdat_students';

    $rows = $wpdb->get_results("SELECT * FROM $table ORDER BY semester, roll", ARRAY_A);

    if (empty($rows)) {

        return "<p>No student records found.</p>";

    }

    $html = "<h3>CDAT Students</h3>";

    $html .= "<table style='width:100%; border-collapse:collapse;'>";

    // Header

    $html .= "<tr>

                <th style='border:1px solid #ccc; padding:6px;'>ID</th>

                <th style='border:1px solid #ccc; padding:6px;'>Roll</th>

                <th style='border:1px solid #ccc; padding:6px;'>Name</th>

                <th style='border:1px solid #ccc; padding:6px;'>Semester</th>

             </tr>";

    // Rows

    foreach ($rows as $r) {

        $html .= "<tr>

                    <td style='border:1px solid #ccc; padding:6px;'>".esc_html($r['id'])."</td>

                    <td style='border:1px solid #ccc; padding:6px;'>".esc_html($r['roll'])."</td>

                    <td style='border:1px solid #ccc; padding:6px;'>".esc_html($r['name'])."</td>

                    <td style='border:1px solid #ccc; padding:6px;'>".esc_html($r['semester'])."</td>

                  </tr>";

    }

    $html .= "</table>";

    return $html;

}

add_shortcode('show_cdat_students', 'cdat_students_display_shortcode');

✔ Features Included

✔ Table auto-creation

✔ Admin menu

✔ List, Add, Edit, Delete

✔ Icons (dashicons-edit, dashicons-trash)

✔ SQL injection safe

✔ WordPress nonce security

✔ Single file, ready to use