It may be possible. A lot of the core API that deals with logins and cookies is pluggable. You could replace wp_set_current_user with something that queried your external database rather than the internal one, for instance. Authentication is already done via a the authenticate filter (wp_authenticate is the function that does this, and the filter … Read more
The ability to store abstract key-value pairs without modifying the database structure is the reason. Without that, WordPress loses much of its flexibility. I can’t speak for others, but the single largest reason why I develop atop WordPress is its flexible nature. To quote one of your links above, Usually the reasoning behind doing what … Read more
The Problem was in this line: time datetime NOT NULL DEFAULT CURRENT_TIMESTAMP, I changed it to: time TIMESTAMP DEFAULT CURRENT_TIMESTAMP, Now, it works.
You cannot suppress the quotes in $wpdb. Run mysqli_real_escape_string() in your script on these variables.
Calling wp_set_wpdb_vars() after replacing $wpdb will probably do the trick. $wpdb = new My_DB(); wp_set_wpdb_vars(); However, the only officially supported way to replace wpdb is to place a db.php in wp-content folder. If you can, I would suggest to do that.
You can just use echo $wpdb->get_var( $sql ): https://developer.wordpress.org/reference/classes/wpdb/
As Ben suggested, you need to pass the connection details when creating the wpdb class: $newdb = new wpdb( ‘user’, ‘password’, ‘database’, ‘hostname’ ); You should also test that the query actually returned something before using the result in a foreach loop: if ($rows) { foreach ($rows as $obj) { … } }
This should get you the names of all such terms in an array $wpdb->get_col(“SELECT DISTINCT {$wpdb->terms}.name FROM {$wpdb->terms} INNER JOIN {$wpdb->term_taxonomy} ON {$wpdb->term_taxonomy}.term_id = {$wpdb->terms}.term_id INNER JOIN {$wpdb->term_relationships} ON {$wpdb->term_taxonomy}.term_taxonomy_id = {$wpdb->term_relationships}.term_taxonomy_id WHERE {$wpdb->term_taxonomy}.taxonomy = ‘shape’ AND {$wpdb->term_relationships}.object_id IN ( SELECT object_id FROM {$wpdb->term_relationships} INNER JOIN {$wpdb->term_taxonomy} ON {$wpdb->term_taxonomy}.term_taxonomy_id = {$wpdb->term_relationships}.term_taxonomy_id WHERE {$wpdb->term_taxonomy}.taxonomy = ‘color’ … Read more
How can I prepare() my wpdb query? I tried but couldn’t manage because of the second parameter. The prepare() works is explained in Codex, you need to have a query with placeholders and additional arguments to replace that placeholders. If you have no placeholders (so no variable parts in the query) then you can use … Read more
query – you will get sql as argument of the callback. add_filter(‘query’, ‘some_callback_that_change_query’); function some_callback_that_change_query($sql){ remove_filter(‘query’, ‘some_callback_that_change_query’); // your banny wrote add_filter(‘query’, ‘some_callback_that_change_query’); return $sql; }