如何在 WooCommerce 中使用 SQL 查询特定类别中的 select 产品

Question

I used below code to select products from specific categories and works fine but I want to select products if include more than one category

SELECT post.ID, post.post_title FROM  `wp_posts` as post

INNER JOIN wp_term_relationships AS tr ON tr.object_id = post.ID 
WHERE
post.`post_type` IN ('product','product_variation') 
AND tr.term_taxonomy_id  IN(32,25)

I use IN(32,25) and it returns all products, how can I filter products just included in two categories?

Answer 1

To query products that are in specific categories (eg categories with the ids of 32 and 35), you could use this:

SELECT wp_posts.* FROM wp_posts LEFT JOIN wp_term_relationships 
ON (wp_posts.ID = wp_term_relationships.object_id) 
WHERE 1=1 
AND 
( wp_term_relationships.term_taxonomy_id IN (32,35) ) 
AND 
wp_posts.post_type = 'product' 
AND 
(wp_posts.post_status = 'publish') 
GROUP BY 
wp_posts.ID 
ORDER BY 
wp_posts.post_date DESC

It's recommended to use global $wpdb and take advantage of

• $wpdb->prefix for your wordpress table "prefix", instead if hard coding "wp_"

and

• $wpdb->prepare for security.

Like this:

global $wpdb;

$query = $wpdb->prepare(
    "SELECT {$wpdb->prefix}posts.* FROM {$wpdb->prefix}posts LEFT JOIN {$wpdb->prefix}term_relationships 
    ON ({$wpdb->prefix}posts.ID = {$wpdb->prefix}term_relationships.object_id) 
    WHERE 1=1 
    AND 
    ( {$wpdb->prefix}term_relationships.term_taxonomy_id IN (32,35) ) 
    AND 
    {$wpdb->prefix}posts.post_type = 'product' 
    AND 
    ({$wpdb->prefix}posts.post_status = 'publish') 
    GROUP BY 
    {$wpdb->prefix}posts.ID 
    ORDER BY 
    {$wpdb->prefix}posts.post_date DESC"
);

$sql_results = $wpdb->get_results($query, ARRAY_A);

---

For security reasons, avoid writing your own sql queries as much as possible.

In order to query your database try to use:

• wp_query ^Docs

or

• wc_get_product ^Docs