Update all WooCommerce products if “sale_price” is greater than “price”

Question

I am trying to update wp_postmeta table for all products sale price.

I'm struggling with how to work this, due to both fields being meta_key / meta_value pairs in this wp_postmeta table.

How can I write a query that will update all '_sale_price' = 0 WHERE '_sale_price' > '_price' ?

Answer 1

A different approach with a custom function that should do the same job. You will have to use this function just one time , and then remove it after the job is done (at first site load, the process will depend on number of products you have).

Here is the code:

function update_products_sale_price(){

    $args = array(
        'posts_per_page' => -1,
        'post_type' => 'product',
        'post_status' => 'publish'
    );

    // getting all products
    $products = get_posts( $args );

    // Going through all products
    foreach ( $products as $key => $value ) {

        // the product ID
        $product_id = $value->ID;

        // Getting the product sale price
        $sale_price = get_post_meta($product_id, '_sale_price', true);

        // if product sale price is not defined we give to the variable a 0 value
        if (empty($sale_price))
            $sale_price = 0;

        // Getting the product sale price
        $price = get_post_meta($product_id, '_price', true);

        // udate sale_price to 0 if sale price is bigger than price
        if ($sale_price > $price)
            update_post_meta($product_id, '_sale_price', '0');
    }
}

// Here the function we will do the job.
update_products_sale_price();

You can also embed the code function in a hook…

This code goes on function.php file of your active child theme or theme

This code is tested and fully functional

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References:

• WordPress Code Reference - Function get_post_meta()
• WordPress Code Reference - Function update_post_meta()