Retrieve WordPress Database Info and display in form - database

Question

Sorry I am new to WordPress and still having difficulty to retrieve my data from my custom database. So far this is my code for submitting data to my wp_datareg table.
<?php
/*
Template Name: Data-Register
*/
get_header();
?>
<?php
If($_POST['Submit']) {
global $wpdb;
$Data1=$_POST['Data1'];
$Data2=$_POST['Data2'];
if($wpdb->insert(
'wp_datareg',
array(
'Data1' => $Data1,
'Data2' => $Data2
)
) == false) wp_die('Database Insertion Failed');
else echo '<h2>Database Insertion Succesful</h2><p />';
?>
<?php
}
else // else we didn't submit the form so display the form
{
?>
<
<h4>Data Registration Form</h4>
<form action="" method="post" id="addcourse">
<p><label>Put Data1:<input type="text" name="Data1" size="30" /></label></p>
<p><label>Put Data2: <input type="text" name="Data2" size="30" /></label></p>
</div>
<input type="submit" name="Submit" id="addcoursesubmit" value="Submit" />
</form>
What I want to add is put another text form and search button where user can search a data of Data1 and edit its value on the form, (please see the image)
Sorry for being such a noob.
PLEASE SEE THIS IMAGE
Thank you.
br

Answer 1

We can fetch data from wp_datareg table using this code, however putting back the data to the form is my problem.
global $wpdb;
$result = $wpdb->get_results ( "SELECT * FROM wp_datareg" );
foreach ( $result as $print ) {
?>
<tr>
<td><?php echo $print->Data1;?></td>
</tr>