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wpdb Class WordPress Developer Resources

    https://developer.wordpress.org/reference/classes/wpdb/
    Using the $wpdb global object # Using the $wpdb global object. WordPress provides a global object, $wpdb, which is an instantiation of the wpdb class. By default, $wpdb is instantiated to talk to the WordPress database. The recommended way to access $wpdb in your WordPress PHP code is to declare $wpdb as a global variable using the global keyword, like this:

Custom $wpdb Query for Custom Post Type by Category ...

    https://wordpress.stackexchange.com/questions/56966/custom-wpdb-query-for-custom-post-type-by-category
    ORDER BY post_date DESC"); foreach($months as $month) : $months_count = $wpdb->get_var( $wpdb->prepare( "SELECT COUNT(*) FROM $wpdb->posts WHERE post_status ='publish' AND post_type ='".$post_type."'

Using wpdb in WordPress - Duc Doan

    https://ducdoan.com/using-wpdb-in-wordpress/
    Jan 10, 2016 · WordPress defines a class called wpdb, which contains a set of functions used to interact with a database. Because this function is built into WordPress, there is no need to open a separate database connection. Because methods in the wpdb class should not be called directly. We have to use the global $wpdb object instead!

$wpdb->update WordPress.org

    https://wordpress.org/support/topic/wpdb-update-4/
    1. You dont need to concatenate $wpdb->prefix and ‘posts’. $wddb->posts gives you the posts table name. 2. The second format you are passing, “%d”, is telling the value is a digit, where it is a string. Replace it with %s. This might work.

Problems with $wpdb WordPress.org

    https://wordpress.org/support/topic/problems-with-wpdb-2/
    I’m trying to change some entries in the wpdb, to change the status of reservations in a booking calendar to approved on a successful payment. It doesn’t seem to work, and I really have no clue as to why. I’m pretty new to wordpress, php and javascript, so it’s probably something really silly. Here’s my code: Functions.php:

WP_Post Class WordPress Developer Resources

    https://developer.wordpress.org/reference/classes/wp_post/
    public static function get_instance ( $post_id ) {. global $wpdb; $post_id = (int) $post_id; if ( ! $post_id ) {. return false; } $_post = wp_cache_get ( $post_id, 'posts' ); if ( ! $_post ) {. $_post = $wpdb->get_row ( $wpdb->prepare ( "SELECT * FROM $wpdb->posts WHERE ID …
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