Wordpress Custom database table with DataTable server side processing - php

Question

I have followed this toturial and have managed to create a shortcode that shows the datatable with filter option. This table works with the native post type of wordpress.
I need the same datatable but it should get the data from a custom database table i have added wp_lubuvna_subscribers
Custom Table:
So i need to change following function to get data from the above mentioned custom table instead custom post type
function datatables_server_side_callback_subscriber_db() {
header("Content-Type: application/json");
$request= $_GET;
$columns = array(
0 => 'post_title',
3 => LUBUVNA_PREFIX.'email',
1 => LUBUVNA_PREFIX.'first_name',
2 => LUBUVNA_PREFIX.'last_name',
4 => LUBUVNA_PREFIX.'phone'
);
$args = array(
'post_type' => 'lubuvna_subscriber',
'post_status' => 'publish',
'posts_per_page' => $request['length'],
'offset' => $request['start'],
'order' => $request['order'][0]['dir'],
);
if ($request['order'][0]['column'] == 0) {
$args['orderby'] = $columns[$request['order'][0]['column']];
} elseif ($request['order'][0]['column'] == 1 || $request['order'][0]['column'] == 2) {
$args['orderby'] = 'meta_value_num';
$args['meta_key'] = $columns[$request['order'][0]['column']];
}
//$request['search']['value'] <= Value from search
if( !empty($request['search']['value']) ) { // When datatables search is used
$args['meta_query'] = array(
'relation' => 'OR',
array(
'key' => 'd_title',
'value' => sanitize_text_field($request['search']['value']),
'compare' => 'LIKE'
),
array(
'key' => LUBUVNA_PREFIX.'email',
'value' => sanitize_text_field($request['search']['value']),
'compare' => 'LIKE'
),
array(
'key' => LUBUVNA_PREFIX.'first_name',
'value' => sanitize_text_field($request['search']['value']),
'compare' => 'LIKE'
),
array(
'key' => LUBUVNA_PREFIX.'last_name',
'value' => sanitize_text_field($request['search']['value']),
'compare' => 'LIKE'
),
array(
'key' => LUBUVNA_PREFIX.'phone',
'value' => sanitize_text_field($request['search']['value']),
'compare' => 'LIKE'
),
);
}
$subscriber_query = new WP_Query($args);
$totalData = $subscriber_query->found_posts;
if ( $subscriber_query->have_posts() ) {
while ( $subscriber_query->have_posts() ) {
$subscriber_query->the_post();
$nestedData = array();
$nestedData[] = get_field(LUBUVNA_PREFIX.'first_name'). '&nbsp'. get_field(LUBUVNA_PREFIX.'last_name');
$nestedData[] = "<a data-val='".get_post_field( 'post_name', get_post() )."' href='".get_permalink()."' data-posttype='".get_post_type( get_the_ID() )."' class='generallink'>" . get_field(LUBUVNA_PREFIX.'email') . "</a>";
$nestedData[] = get_field(LUBUVNA_PREFIX.'first_name');
$nestedData[] = get_field(LUBUVNA_PREFIX.'last_name');
$nestedData[] = get_field(LUBUVNA_PREFIX.'phone');
$data[] = $nestedData;
}
wp_reset_query();
$json_data = array(
"draw" => intval($request['draw']),
"recordsTotal" => intval($totalData),
"recordsFiltered" => intval($totalData),
"data" => $data
);
echo json_encode($json_data);
} else {
$json_data = array(
"data" => array()
);
echo json_encode($json_data);
}
wp_die();
}

Answer 1

So i will post this here, in case someone else is looking for the same solution. I had to add global $wpdband get the data from my custom database table. it works perfectly with paging / sorting / Search.
function datatables_server_side_callback_subscriber_db() {
header("Content-Type: application/json");
global $wpdb;
// Table name
$table_name = $wpdb->prefix . "lubuvna_subscribers";
// Request
$request= $_GET;
// Columns
$columns = array(
0 => 'ID',
1 => 'first_name',
2 => 'last_name',
3 => 'email',
4 => 'phone'
);
// Datatable Filters
$column = $columns[$request['order'][0]['column']];
$offset = $request['start'];
$length = $request['length'];
$order = $request['order'][0]['dir'];
// Search all columns
$sql_where = "";
if ( !empty($request['search']['value']) ) {
$sql_where .= "WHERE ";
foreach ($columns as $column) {
$sql_where .= $column . " LIKE '%" . sanitize_text_field($request['search']['value']) . "%' OR ";
}
$sql_where = substr($sql_where, 0, -3);
}
// Total Records in the datatable
$total_table_records = "SELECT count(*) as count FROM {$table_name}";
$total_fetched_records = $wpdb->get_results($total_table_records, OBJECT);
$total_records = $total_fetched_records[0]->count;
// Total Records Search
$total_table_records_search = "SELECT count(*) as count FROM $table_name $sql_where";
$total_fetched_records_search = $wpdb->get_results($total_table_records_search, OBJECT);
$total_records_search = $total_fetched_records_search[0]->count;
// Query
$total_results = $wpdb->get_results( "SELECT * FROM $table_name $sql_where ORDER BY $column $order LIMIT $offset, $length" );
if ( !empty($total_results) ) {
foreach ($total_results as $row){
$nestedData = array();
$nestedData[] = $row->ID;
$nestedData[] = $row->first_name;
$nestedData[] = $row->last_name;
$nestedData[] = $row->email;
$nestedData[] = $row->phone;
$data[] = $nestedData;
}
$json_data = array(
"draw" => intval($request['draw']),
"recordsTotal" => intval($total_records),
"recordsFiltered" => intval($total_records_search),
"data" => $data
);
echo json_encode($json_data);
} else {
$json_data = array(
"data" => array()
);
echo json_encode($json_data);
}
wp_die();
}