wpdb update query not working - mysql

Question

I've made an email script that should update as soon as wp_mail has result. For some reason my value won't update. Have I missed something? I am receiving the mail so the wp_mail works.
Cheers!
$email_result = wp_mail( $to, $subject, $message, $headers );
if( $email_result ){//wp_mail() processed the request successfully
global $wpdb;
$table_name = $wpdb->prefix . "wpsc_coupon_codes";
$coupon_id = $ereminder->ID;
$ereminders = $wpdb->query( $wpdb->prepare("
UPDATE *
FROM $table_name
SET reminder = 1
WHERE ID = $coupon_id
") );
}

Answer 1

Try This:
$wpdb->update( $table_name, array( 'reminder' => 1),array('ID'=>$coupon_id));

Answer 2

try this
UPDATE $table_name
SET reminer = 1
WHERE ID = $coupon_id

Answer 3

We could use $wpdb->update, like this:
global $wpdb;
$table_name = $wpdb->prefix.'your_table_name';
$data_update = array('row_name_1' => $row_data_1 ,'row_name_2' => $row_data_2);
$data_where = array('row_name' => $row_data);
$wpdb->update($table_name , $data_update, $data_where);

Answer 4

You may change instead of (UPDATE * FROM)
$ereminders = $wpdb->query($wpdb->prepare("UPDATE $table_name SET reminer='1' WHERE ID=$coupon_id"));
and use no break.
Thank you.

Answer 5

Example of mine that is working:
$result = $wpdb->update(
$wpdb->prefix .'sae_calendar',
array(
'year' => $year,
'quarter' => $quarter,
'start_date' => $start_date,
'end_date' => $end_date,
'reservation_start_date' => $reservation_start_date,
'reservation_end_date' => $reservation_end_date
),
array(
"id" => $id
)
);

Answer 6

<?php
global $wpdb;
if(isset($_POST['progress'])){
$table=t_test;
$data=array('client_development'=>$_POST['Progress']);
$where=array('p_id'=>$_SESSION['id']);
$format=("%d");
$whereFormat=("%d");
$result4=$wpdb->UPDATE($table,$data,$where,$format,$whereFormat);
}
?>
<form method="post">
<input type="text" name="Progress">
<input type="submit" name="progress" value="Prog%">
</form>
<?php
if(isset($_POST['progress'])){
$table=t_test;
$data=array('client_development'=>$_POST['Progress']);
$where=array('p_id'=>$_SESSION['id']);
$format=("%d");
$whereFormat=("%d");
$result4=$wpdb->UPDATE($table,$data,$where,$format,$whereFormat);
}
?>
<form method="post">
<input type="text" name="Progress">
<input type="submit" name="progress" value="Prog%">
</form>