$ wpdb-> get_results在服务器上不返回任何内容，但适用于本地 - Wordpress

Question

I have created a table called ccc_campaigns in my database and I am retrieving the data with the following statement:

global $wpdb;

$campaign_list = $wpdb->get_results( 
                'SELECT * 
                 FROM ccc_campaigns 
                 ORDER BY id DESC');

This works as expected on my local and on one of my servers, the data is displayed doing:

foreach ($campaign_list as $campaign)

But in the server where this wordpress is supposed to be, the query comes back empty. I can't understand or find a reason why it is failing on that server.

Any ideas?

Thank you so much

Answer 1

Make sure the database prefix are the same.

EDIT: I guess you are building some kind of plugin, so just to make sure, db prefix is not causing any errors, use this function instead.

function getCampaignResults(){
    global $wpdb;
    $table_name = $wpdb->prefix . "campaigns";
    $active_rows = $wpdb->get_results(
        "SELECT * FROM {$table_name}"
    );

    foreach ($active_rows as $active_row){
        echo $active_row->the_title;
    }
}