I followed the introduction to use prepare to insert some data to the table. The code is like this:

                "INSERT INTO {$wpdb->prefix}awpcp_adphotos VALUES
                (ad_id, image_name, disabled, isprimary)
                (%d, %s, %d,%d)",

also, disabled and is_primary should be Boolean. But I am not sure what the data type in here.

I also tried

'{$wpdb->prefix}awpcp_adphotos', // Table name
    'ad_id' => $ad_id,
    'image_name' => $ad_img,
    'disabled' => 0,
    'is_primary' => 0,
), // Columns
) // Explicit formatting


But I haven't got any luck yet. There is no error message when I run the code.

Okay, I found answers in somewhere else. it should be like this:

    $wpdb->insert($wpdb->prefix.'awpcp_adphotos', array(
 'ad_id' => $ad_id,
 'image_name' => $image_name,
 'disabled' => $disabled,
 'isprimary' => $isprimary,

I was confused with prefix format.

  • Do you have debugging information?
    – s_ha_dum
    Jun 21, 2013 at 18:46
  • Have you looked at $wpdb->last_error to find what the error message is?
    – Otto
    Jun 21, 2013 at 18:48
  • Guys, come on. You don't need debug to see that these queries are not correct ;) Jun 21, 2013 at 18:53

1 Answer 1


I'm pretty sure that first SQL query isn't correct SQL (insert has different syntax) ;) It should be:

INSERT INTO {$wpdb->prefix}awpcp_adphotos (ad_id, image_name, disabled, isprimary) VALUES (%d, %s, %d,%d)

In second example, I'm almost sure that ad_id is not string, and image_name is not a number. Of cours I'm only guessing, because I haven't seen this table definition.

Remember that you can always turn error reporting for wpdb on. Just put this line in your code and you will see wpdb errors:


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