ถามเรื่องการแบ่งหน้าครับ

พอดีผมทำ CRUD ตามลิงค์ข้างต้นนี้ครับ แต่ในนี้ไม่ได้ระบุการแบ่งหน้าเอาไว้อะครับอยากทราบแนวทางการแบ่งอะครับที่ไม่กระทบต่อการแก้ไขแล้วก็ลบข้อมูลครับ
http://www.itechempires.com/2016/03/php-mysql-crud-create-read-update-delete-operations-using-jquery/

#แปะโค๊ดส่วนที่น่าจะเกี่ยวข้องกับคำถามครับ

 

CREATE TABLE  `test`.`users` (
`id` INT( 11 ) NOT NULL AUTO_INCREMENT PRIMARY KEY ,
`first_name` VARCHAR( 40 ) NOT NULL ,
`last_name` VARCHAR( 40 ) NOT NULL ,
`email` VARCHAR( 50 ) NOT NULL
) ENGINE = MYISAM ;

// Add Record
function addRecord() {
    // get values
    var first_name = $("#first_name").val();
    var last_name = $("#last_name").val();
    var email = $("#email").val();

    // Add record
    $.post("ajax/addRecord.php", {
        first_name: first_name,
        last_name: last_name,
        email: email
    }, function (data, status) {
        // close the popup
        $("#add_new_record_modal").modal("hide");

        // read records again
        readRecords();

        // clear fields from the popup
        $("#first_name").val("");
        $("#last_name").val("");
        $("#email").val("");
    });
}

// READ records
function readRecords() {
    $.get("ajax/readRecords.php", {}, function (data, status) {
        $(".records_content").html(data);
    });
}


function DeleteUser(id) {
    var conf = confirm("Are you sure, do you really want to delete User?");
    if (conf == true) {
        $.post("ajax/deleteUser.php", {
                id: id
            },
            function (data, status) {
                // reload Users by using readRecords();
                readRecords();
            }
        );
    }
}

function GetUserDetails(id) {
    // Add User ID to the hidden field for furture usage
    $("#hidden_user_id").val(id);
    $.post("ajax/readUserDetails.php", {
            id: id
        },
        function (data, status) {
            // PARSE json data
            var user = JSON.parse(data);
            // Assing existing values to the modal popup fields
            $("#update_first_name").val(user.first_name);
            $("#update_last_name").val(user.last_name);
            $("#update_email").val(user.email);
        }
    );
    // Open modal popup
    $("#update_user_modal").modal("show");
}

function UpdateUserDetails() {
    // get values
    var first_name = $("#update_first_name").val();
    var last_name = $("#update_last_name").val();
    var email = $("#update_email").val();

    // get hidden field value
    var id = $("#hidden_user_id").val();

    // Update the details by requesting to the server using ajax
    $.post("ajax/updateUserDetails.php", {
            id: id,
            first_name: first_name,
            last_name: last_name,
            email: email
        },
        function (data, status) {
            // hide modal popup
            $("#update_user_modal").modal("hide");
            // reload Users by using readRecords();
            readRecords();
        }
    );
}

$(document).ready(function () {
    // READ recods on page load
    readRecords(); // calling function
});

<?php
	// include Database connection file 
	include("db_connection.php");

	// Design initial table header 
	$data = '<table class="table table-bordered table-striped">
						<tr>
							<th>No.</th>
							<th>First Name</th>
							<th>Last Name</th>
							<th>Email Address</th>
							<th>Update</th>
							<th>Delete</th>
						</tr>';

	$query = "SELECT * FROM users";

	if (!$result = mysql_query($query)) {
        exit(mysql_error());
    }

    // if query results contains rows then featch those rows 
    if(mysql_num_rows($result) > 0)
    {
    	$number = 1;
    	while($row = mysql_fetch_assoc($result))
    	{
    		$data .= '<tr>
				<td>'.$number.'</td>
				<td>'.$row['first_name'].'</td>
				<td>'.$row['last_name'].'</td>
				<td>'.$row['email'].'</td>
				<td>
					<button onclick="GetUserDetails('.$row['id'].')" class="btn btn-warning">Update</button>
				</td>
				<td>
					<button onclick="DeleteUser('.$row['id'].')" class="btn btn-danger">Delete</button>
				</td>
    		</tr>';
    		$number++;
    	}
    }
    else
    {
    	// records now found 
    	$data .= '<tr><td colspan="6">Records not found!</td></tr>';
    }

    $data .= '</table>';

    echo $data;
?>