How to query a list of posts using wpdb?
If you want really retrieve a list of posts rely on WP_Query using meta_query param. If you want to use $wpdb (I don’t know why) right query is something like:
How to do wpdb query in MySQL database?
wpdb::query (string $query) Performs a MySQL database query, using current database connection.
How to query posts with meta value containing?
Change meta_value = %s to meta_value LIKE %s, and your query should work the same as though you used the full serialised string. it is also returning all the revisions, not just the most recent post. Make sure you specify the correct post type and status when querying your results.
How to get a single row in wpdb?
$wpdb->get_row – return single row To retrieve an entire row You would like to use the get_row () method. By default the row is returned as an object, but you can add the PRODUCT_ARRAY or PRODUCT_ARR_ALL parameter at the end of your method.
How big is the post meta table in WordPress?
Login to your cPanel hosting account. Click on phpMyAdmin app. Select your database and sort the database with “Size” column. You can find the biggest table on the top. As you can see in the above screenshot, the post table is 26.6MB while post meta table is 109.8MB in size.
How can I edit post data before it is saved?
Please note that I want to intercept the data on it’s way to being saved in the database – not when it is being displayed in the post (eg: Not by adding a filter to the_content) Use filter content_save_pre exactly like the_content — the difference is that it operates when a post is saved, rather than displayed.
How to fetch records from database WordPress.com?
So, $wpdb->query is really for queries that don’t return data, like a delete. You want prepare as well if you were using user supplied data. That will return an object, but you can pass a second parameter to get an array. You can iterate over that object or array with ordinary PHP object/array operations.
What does the database hold in WordPress.com?
The database holds, as with any other PHP/MySQL applications, your dynamic content– posts, pages, configurable options, category tables, etc. It is not an easily enumerable list.