In this tutorial, we are going to learn How to create crud operations plugin in WordPress.
After Read read this article you can create easily create custom CRUD(Create/Insert, Read/Select, Update, Delete) Operation Plugin.
Step 1. Create a custom table
We are working with custom crud database operations so we need to have database table to store be able to store data.
<?
/*
* Plugin Name: Custom EMS
* Description: My plugin to explain the crud functionality.
* Version: 1.0
* Author: Diwakar Academy
* Plugin URI: https://diwakaracademy.com/how-to-create-crud-operations-plugin-in-wordpress/
* Author URI: https://diwakaracademy.com/
*/
register_activation_hook(__FILE__, 'table_creator');
function table_creator()
{
global $wpdb;
$charset_collate = $wpdb->get_charset_collate();
$table_name = $wpdb->prefix . 'ems';
$sql = "DROP TABLE IF EXISTS $table_name;
CREATE TABLE $table_name(
id mediumint(11) NOT NULL AUTO_INCREMENT,
emp_id varchar(50) NOT NULL,
emp_name varchar (250) NOT NULL,
emp_email varchar (250) NOT NULL,
emp_dept varchar (250) NOT NULL,
PRIMARY KEY id(id)
)$charset_collate;";
require_once(ABSPATH . 'wp-admin/includes/upgrade.php');
dbDelta($sql);
}CREATE TABLE statement is used to create a table in a database.
The register_activation_hook() function will make sure that it will automatically create a database table using the code inside the function table_creator().
Step 2. Create a page and menu to show the table
add_action('admin_menu', 'da_display_esm_menu');
function da_display_esm_menu()
{
add_menu_page('EMS', 'EMS', 'manage_options', 'emp-list', 'da_ems_list_callback');
add_submenu_page('emp-list', 'Employee List', 'Employee List', 'manage_options', 'emp-list', 'da_ems_list_callback');
add_submenu_page('emp-list', 'Add Employee', 'Add Employee', 'manage_options', 'add-emp', 'da_ems_add_callback');
}
function da_ems_add_callback()
{
global $wpdb;
$table_name = $wpdb->prefix . 'ems';
$msg = '';
if (isset($_REQUEST['submit'])) {
$wpdb->insert("$table_name", [
"emp_id" => $_REQUEST['emp_id'],
'emp_name' => $_REQUEST['emp_name'],
'emp_email' => $_REQUEST['emp_email'],
'emp_dept' => $_REQUEST['emp_dept']
]);
if ($wpdb->insert_id > 0) {
$msg = "Saved Successfully";
} else {
$msg = "Failed to save data";
}
}
?>
<h4 id="msg"><?php echo $msg; ?></h4>
<form method="post">
<p>
<label>EMP ID</label>
<input type="text" name="emp_id" placeholder="Enter ID" required>
</p>
<p>
<label>Name</label>
<input type="text" name="emp_name" placeholder="Enter Name" required>
</p>
<p>
<label>Email</label>
<input type="email" name="emp_email" placeholder="Enter Email" required>
</p>
<p>
<label>Department</label>
<input type="text" name="emp_dept" placeholder="Enter Department" required>
</p>
<p>
<button type="submit" name="submit">Submit</button>
</p>
</form>
<?php }
function da_ems_list_callback(){
echo "<h2>Employee List</h2>";
}
Step 3. display record in tabular format
function da_ems_list_callback()
{
global $wpdb;
$table_name = $wpdb->prefix . 'ems';
$employee_list = $wpdb->get_results($wpdb->prepare("select * FROM $table_name", ""), ARRAY_A);
if (count($employee_list) > 0): ?>
<div style="margin-top: 40px;">
<table border="1" cellpadding="10">
<tr>
<th>S.No.</th>
<th>EMP ID</th>
<th>Name</th>
<th>Email</th>
<th>Department</th>
<th>Action</th>
</tr>
<?php $i = 1;
foreach ($employee_list as $index => $employee): ?>
<tr>
<td><?php echo $i++; ?></td>
<td><?php echo $employee['emp_id']; ?></td>
<td><?php echo $employee['emp_name']; ?></td>
<td><?php echo $employee['emp_email']; ?></td>
<td><?php echo $employee['emp_dept']; ?></td>
<td>
<a href="admin.php?page=update-emp&id=<?php echo $employee['id']; ?>">Edit</a>
<a href="admin.php?page=delete-emp&id=<?php echo $employee['id']; ?>">Delete</a>
</td>
</tr>
<?php endforeach; ?>
</table>
</div>
<?php else:echo "<h2>Employee Record Not Found</h2>";endif;
}
Step 4. Create the update functionality.
add_action('admin_menu', 'da_display_esm_menu');
function da_display_esm_menu()
{
add_menu_page('EMS', 'EMS', 'manage_options', 'emp-list', 'da_ems_list_callback');
add_submenu_page('emp-list', 'Employee List', 'Employee List', 'manage_options', 'emp-list', 'da_ems_list_callback');
add_submenu_page('emp-list', 'Add Employee', 'Add Employee', 'manage_options', 'add-emp', 'da_ems_add_callback');
//add menu for update
add_submenu_page(null, 'Update Employee', 'Update Employee', 'manage_options', 'update-emp', 'da_emp_update_call');
}
function da_emp_update_call()
{
global $wpdb;
$table_name = $wpdb->prefix . 'ems';
$msg = '';
$id = isset($_REQUEST['id']) ? intval($_REQUEST['id']) : "";
if (isset($_REQUEST['update'])) {
if (!empty($id)) {
$wpdb->update("$table_name", ["emp_id" => $_REQUEST['emp_id'], 'emp_name' => $_REQUEST['emp_name'], 'emp_email' => $_REQUEST['emp_email'], 'emp_dept' => $_REQUEST['emp_dept']], ["id" => $id]);
$msg = 'Data updated';
}
}
$employee_details = $wpdb->get_row($wpdb->prepare("SELECT * FROM $table_name where id = %d", $id), ARRAY_A); ?>
<h4><?php echo $msg; ?></h4>
<form method="post">
<p>
<label>EMP ID</label>
<input type="text" name="emp_id" placeholder="Enter ID" value="<?php echo $employee_details['emp_id']; ?>"
required>
</p>
<p>
<label>Name</label>
<input type="text" name="emp_name" placeholder="Enter Name"
value="<?php echo $employee_details['emp_name']; ?>" required>
</p>
<p>
<label>Email</label>
<input type="email" name="emp_email" placeholder="Enter Email"
value="<?php echo $employee_details['emp_email']; ?>" required>
</p>
<p>
<label>Department</label>
<input type="text" name="emp_dept" placeholder="Enter Department"
value="<?php echo $employee_details['emp_dept']; ?>" required>
</p>
<p>
<button type="submit" name="update">Update</button>
</p>
</form>
<?php }Step 5. Create the delete functionality.
add_action('admin_menu', 'da_display_esm_menu');
function da_display_esm_menu()
{
add_menu_page('EMS', 'EMS', 'manage_options', 'emp-list', 'da_ems_list_callback');
add_submenu_page('emp-list', 'Employee List', 'Employee List', 'manage_options', 'emp-list', 'da_ems_list_callback');
add_submenu_page('emp-list', 'Add Employee', 'Add Employee', 'manage_options', 'add-emp', 'da_ems_add_callback');
add_submenu_page(null, 'Update Employee', 'Update Employee', 'manage_options', 'update-emp', 'da_emp_update_call');
//add menu for delete
add_submenu_page(null, 'Delete Employee', 'Delete Employee', 'manage_options', 'delete-emp', 'da_emp_delete_call');
}
function da_emp_delete_call()
{
global $wpdb;
$table_name = $wpdb->prefix . 'ems';
$id = isset($_REQUEST['id']) ? intval($_REQUEST['id']) : "";
if (isset($_REQUEST['delete'])) {
if ($_REQUEST['conf'] == 'yes') {
$row_exits = $wpdb->get_row($wpdb->prepare("SELECT * FROM $table_name WHERE id = %d", $id), ARRAY_A);
if (count($row_exits) > 0) {
$wpdb->delete("$table_name", array('id' => $id,));
}
} ?>
<script>
location.href = "<?php echo site_url(); ?>/wp-admin/admin.php?page=emp-list";
</script>
<?php } ?>
<form method="post">
<p>
<label>Are you sure want delete?</label><br>
<input type="radio" name="conf" value="yes">Yes
<input type="radio" name="conf" value="no" checked>No
</p>
<p>
<button type="submit" name="delete">Delete</button>
<input type="hidden" name="id" value="<?php echo $id; ?>">
</p>
</form>
<?php }
Step 6. Display record in front end.
add_action('admin_menu', 'da_display_esm_menu');
function da_display_esm_menu()
{
add_menu_page('EMS', 'EMS', 'manage_options', 'emp-list', 'da_ems_list_callback');
add_submenu_page('emp-list', 'Employee List', 'Employee List', 'manage_options', 'emp-list', 'da_ems_list_callback');
add_submenu_page('emp-list', 'Add Employee', 'Add Employee', 'manage_options', 'add-emp', 'da_ems_add_callback');
add_submenu_page(null, 'Update Employee', 'Update Employee', 'manage_options', 'update-emp', 'da_emp_update_call');
add_submenu_page(null, 'Delete Employee', 'Delete Employee', 'manage_options', 'delete-emp', 'da_emp_delete_call');
//add menu for display shortcode
add_submenu_page('emp-list', 'Employee List Shortcode', 'Employee List Shortcode', 'edit_others_posts', 'emp-shotcode', 'da_emp_shortcode_call');
}
function da_emp_shortcode_call()
{ ?>
<p>
<label>Shortcode</label>
<input type="text" value="[employee_list]">
</p>
<?php }
//[employee_list]
add_shortcode('employee_list', 'da_ems_list_callback');
function da_ems_list_callback()
{
global $wpdb;
$table_name = $wpdb->prefix . 'ems';
$employee_list = $wpdb->get_results($wpdb->prepare("select * FROM $table_name", ""), ARRAY_A);
if (count($employee_list) > 0): ?>
<div style="margin-top: 40px;">
<table border="1" cellpadding="10">
<tr>
<th>S.No.</th>
<th>EMP ID</th>
<th>Name</th>
<th>Email</th>
<th>Department</th>
<?php if (is_admin()): ?>
<th>Action</th>
<?php endif; ?>
</tr>
<?php $i = 1;
foreach ($employee_list as $index => $employee): ?>
<tr>
<td><?php echo $i++; ?></td>
<td><?php echo $employee['emp_id']; ?></td>
<td><?php echo $employee['emp_name']; ?></td>
<td><?php echo $employee['emp_email']; ?></td>
<td><?php echo $employee['emp_dept']; ?></td>
<?php if (is_admin()): ?>
<td>
<a href="admin.php?page=update-emp&id=<?php echo $employee['id']; ?>">Edit</a>
<a href="admin.php?page=delete-emp&id=<?php echo $employee['id']; ?>">Delete</a>
</td>
<?php endif; ?>
</tr>
<?php endforeach; ?>
</table>
</div>
<?php else:echo "<h2>Employee Record Not Found</h2>";endif;
}
Complete source code
<?php
/*
* Plugin Name: Custom EMS
* Description: My plugin to explain the crud functionality.
* Version: 1.0
* Author: Diwakar Academy
* Plugin URI: https://diwakaracademy.com/how-to-create-crud-operations-plugin-in-wordpress/
* Author URI: https://diwakaracademy.com/
*/
register_activation_hook(__FILE__, 'table_creator');
function table_creator()
{
global $wpdb;
$charset_collate = $wpdb->get_charset_collate();
$table_name = $wpdb->prefix . 'ems';
$sql = "DROP TABLE IF EXISTS $table_name;
CREATE TABLE $table_name(
id mediumint(11) NOT NULL AUTO_INCREMENT,
emp_id varchar(50) NOT NULL,
emp_name varchar (250) NOT NULL,
emp_email varchar (250) NOT NULL,
emp_dept varchar (250) NOT NULL,
PRIMARY KEY id(id)
)$charset_collate;";
require_once(ABSPATH . 'wp-admin/includes/upgrade.php');
dbDelta($sql);
}
add_action('admin_menu', 'da_display_esm_menu');
function da_display_esm_menu()
{
add_menu_page('EMS', 'EMS', 'manage_options', 'emp-list', 'da_ems_list_callback');
add_submenu_page('emp-list', 'Employee List', 'Employee List', 'manage_options', 'emp-list', 'da_ems_list_callback');
add_submenu_page('emp-list', 'Add Employee', 'Add Employee', 'manage_options', 'add-emp', 'da_ems_add_callback');
add_submenu_page(null, 'Update Employee', 'Update Employee', 'manage_options', 'update-emp', 'da_emp_update_call');
add_submenu_page(null, 'Delete Employee', 'Delete Employee', 'manage_options', 'delete-emp', 'da_emp_delete_call');
add_submenu_page('emp-list', 'Employee List Shortcode', 'Employee List Shortcode', 'edit_others_posts', 'emp-shotcode', 'da_emp_shortcode_call');
}
function da_ems_add_callback()
{
global $wpdb;
$table_name = $wpdb->prefix . 'ems';
$msg = '';
if (isset($_REQUEST['submit'])) {
$wpdb->insert("$table_name", [
"emp_id" => $_REQUEST['emp_id'],
'emp_name' => $_REQUEST['emp_name'],
'emp_email' => $_REQUEST['emp_email'],
'emp_dept' => $_REQUEST['emp_dept']
]);
if ($wpdb->insert_id > 0) {
$msg = "Saved Successfully";
} else {
$msg = "Failed to save data";
}
}
?>
<h4 id="msg"><?php echo $msg; ?></h4>
<form method="post">
<p>
<label>EMP ID</label>
<input type="text" name="emp_id" placeholder="Enter ID" required>
</p>
<p>
<label>Name</label>
<input type="text" name="emp_name" placeholder="Enter Name" required>
</p>
<p>
<label>Email</label>
<input type="email" name="emp_email" placeholder="Enter Email" required>
</p>
<p>
<label>Department</label>
<input type="text" name="emp_dept" placeholder="Enter Department" required>
</p>
<p>
<button type="submit" name="submit">Submit</button>
</p>
</form>
<?php }
function da_emp_shortcode_call()
{ ?>
<p>
<label>Shortcode</label>
<input type="text" value="[employee_list]">
</p>
<?php }
//[employee_list]
add_shortcode('employee_list', 'da_ems_list_callback');
function da_ems_list_callback()
{
global $wpdb;
$table_name = $wpdb->prefix . 'ems';
$employee_list = $wpdb->get_results($wpdb->prepare("select * FROM $table_name", ""), ARRAY_A);
if (count($employee_list) > 0): ?>
<div style="margin-top: 40px;">
<table border="1" cellpadding="10">
<tr>
<th>S.No.</th>
<th>EMP ID</th>
<th>Name</th>
<th>Email</th>
<th>Department</th>
<?php if (is_admin()): ?>
<th>Action</th>
<?php endif; ?>
</tr>
<?php $i = 1;
foreach ($employee_list as $index => $employee): ?>
<tr>
<td><?php echo $i++; ?></td>
<td><?php echo $employee['emp_id']; ?></td>
<td><?php echo $employee['emp_name']; ?></td>
<td><?php echo $employee['emp_email']; ?></td>
<td><?php echo $employee['emp_dept']; ?></td>
<?php if (is_admin()): ?>
<td>
<a href="admin.php?page=update-emp&id=<?php echo $employee['id']; ?>">Edit</a>
<a href="admin.php?page=delete-emp&id=<?php echo $employee['id']; ?>">Delete</a>
</td>
<?php endif; ?>
</tr>
<?php endforeach; ?>
</table>
</div>
<?php else:echo "<h2>Employee Record Not Found</h2>";endif;
}
function da_emp_update_call()
{
global $wpdb;
$table_name = $wpdb->prefix . 'ems';
$msg = '';
$id = isset($_REQUEST['id']) ? intval($_REQUEST['id']) : "";
if (isset($_REQUEST['update'])) {
if (!empty($id)) {
$wpdb->update("$table_name", ["emp_id" => $_REQUEST['emp_id'], 'emp_name' => $_REQUEST['emp_name'], 'emp_email' => $_REQUEST['emp_email'], 'emp_dept' => $_REQUEST['emp_dept']], ["id" => $id]);
$msg = 'Data updated';
}
}
$employee_details = $wpdb->get_row($wpdb->prepare("SELECT * FROM $table_name where id = %d", $id), ARRAY_A); ?>
<h4><?php echo $msg; ?></h4>
<form method="post">
<p>
<label>EMP ID</label>
<input type="text" name="emp_id" placeholder="Enter ID" value="<?php echo $employee_details['emp_id']; ?>"
required>
</p>
<p>
<label>Name</label>
<input type="text" name="emp_name" placeholder="Enter Name"
value="<?php echo $employee_details['emp_name']; ?>" required>
</p>
<p>
<label>Email</label>
<input type="email" name="emp_email" placeholder="Enter Email"
value="<?php echo $employee_details['emp_email']; ?>" required>
</p>
<p>
<label>Department</label>
<input type="text" name="emp_dept" placeholder="Enter Department"
value="<?php echo $employee_details['emp_dept']; ?>" required>
</p>
<p>
<button type="submit" name="update">Update</button>
</p>
</form>
<?php }
function da_emp_delete_call()
{
global $wpdb;
$table_name = $wpdb->prefix . 'ems';
$id = isset($_REQUEST['id']) ? intval($_REQUEST['id']) : "";
if (isset($_REQUEST['delete'])) {
if ($_REQUEST['conf'] == 'yes') {
$row_exits = $wpdb->get_row($wpdb->prepare("SELECT * FROM $table_name WHERE id = %d", $id), ARRAY_A);
if (count($row_exits) > 0) {
$wpdb->delete("$table_name", array('id' => $id,));
}
} ?>
<script>
location.href = "<?php echo site_url(); ?>/wp-admin/admin.php?page=emp-list";
</script>
<?php } ?>
<form method="post">
<p>
<label>Are you sure want delete?</label><br>
<input type="radio" name="conf" value="yes">Yes
<input type="radio" name="conf" value="no" checked>No
</p>
<p>
<button type="submit" name="delete">Delete</button>
<input type="hidden" name="id" value="<?php echo $id; ?>">
</p>
</form>
<?php }
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