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I have this WP Query running for each row in my admin screen for a certain post type:

        $entry_args = array(
            'meta_key'   => 'wp_comp_entry_competition-id',
            'meta_value' => $post_ID,
            'post_type'  => 'wp_comp_entries'
        );
        $entry_query = new WP_Query( $entry_args );

This WP Query fetches all entries for a competition identified by the $post_ID. There is a lot of data since a single competition will have thousands entries.

In consequence, this query repeated multiple times (for each row in an admin screen) is rather slow. Moreover, I do not need all this data. I only want to know the number of entries for each competition identified by $post_ID.

I assume that the way to fetch only the COUNT of entries would be changing this WP Query into a simpler, direct SQL query on WordPress database.

How can I fetch only the number of entries for each competition and not all post data associated with each entry?

Further explanation:

I've now tried fetching only the count of posts with these two approaches:

1) Passing 'fields' => 'ids' to query arguments

        $entry_args = array(
            'meta_key'   => 'wp_comp_entry_competition-id',
            'meta_value' => $post_ID,
            'post_type'  => 'wp_comp_entries',
            'fields'     => 'ids'
        );
        $entry_query = new WP_Query( $entry_args );

and then using $entry_qyery->found->posts to get the number, and

2) Using query_posts like this:

        $entry_args = array(
            'meta_key'   => 'wp_comp_entry_competition-id',
            'meta_value' => $post_ID,
            'post_type'  => 'wp_comp_entries',
            'fields'     => 'ids',
            'posts_per_page' => -1
        );
        $entry_query = query_posts( $entry_args );

and then using count($entry_query) to count all fetched ids (as query_posts returned an array).

My first experience is that query_posts was much slower than WP Query in this case.

9
  • Did you try 'fields' => 'ids' to return only the post IDs ? Here's another way, "changing this WP Query into a simpler, direct SQL query" – birgire Jul 20 '15 at 9:45
  • @birgire I wonder what the performance effect will be if we query one post only, also just get the ID of that singular post. By default, WP_Query will still try to find all matching posts according to query in order to count them for pagination purposes. We can then still use $entry_query->found_posts to get the correct post count for the specific query ;-) – Pieter Goosen Jul 20 '15 at 9:56
  • @birgire, I've now added 'fields' => 'ids', to my WP Query argumets array. I'm still using $entry_query->found_posts to display the count of posts. I think that this should improve performance as only ids are fetched. – luqo33 Jul 20 '15 at 10:00
  • @PieterGoosen, are you suggesting that fetching only ids of selected posts with 'fields' => 'ids' will not bring a performance improvement? – luqo33 Jul 20 '15 at 10:01
  • No, setting the fields parameter to just get ID's can improve performance alot. It is up to 99.9% faster than a normal query. What I was thinking is, setting the posts_per_page parameter to just 1 and fields to ids. This will return 1 post ID, but $found_posts should still return a post count of all matching posts. This is how pagination is calculated. It does not matter how many posts you query, WP_Query still goes through the complete db counting all matching posts and stores the post count as $found_posts. This is used to calculate pagination. – Pieter Goosen Jul 20 '15 at 10:12
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You can also try below code to retrieve count of rows.

$myquery = $wpdb->get_results( "SELECT * FROM  tablename WHERE ID='some-value'" );
echo  $wpdb->num_rows;

Let me know if you have any problem.

cheers

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  • 2
    SELECT * is definitely NOT the way to go. It fetches ALL data associated with a given entry and is very bad practice. – luqo33 Jul 20 '15 at 10:05
  • 1
    but you wanted a simple query right? – Blue Rose Jul 20 '15 at 10:10

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