Server-side processing, return value indipendent from mysql result, how to?

itajackass

I need to return values with serverside processing. All is ok but I want to add a cell with custom values, indipendent from mysql result.
In my example i'd like to add a cell (index 2) with only a button.... but if I set db = '' (empty) I get syntax error....
If I omit all array for index 2, I get datatable error.
What is the best way to do this?

$primaryKey = 'ID';

$columns = array(
array(
    'db' => 'ID',
    'dt' => 'DT_RowId',
    'formatter' => function( $d, $row ) {
        return 'row_'.$d;
    }
),
array(
    'db' => 'Name',
    'dt' => 0,
    'formatter' => function( $d, $row ) {
        return $d;
    }
),
array(
    'db' => 'Price',
    'dt' => 1,
    'formatter' => function( $d, $row ) {
        return  '<input type="text" class="form-control number price" value="' .  $d . '">';
    }
),
array(
    'db' => '', //<-----------------------error
    'dt' => 2,
    'formatter' => function( $d, $row ) {

        return  '<button class="btn-delete-row">DELETE</button>';
    }
),
array(
    'db' => 'tax',
    'dt' => 3,
    'formatter' => function( $d, $row ) {

        return $d;

    }
),

colin

This thread should help, it's asking the same thing.

Cheers,

Colin