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For each of these: SELECT * FROM wp_posts INNER JOIN wp_postmeta m1 ON (wp_posts.
ID = m1.post_id ) INNER JOIN wp_postmeta m2 ON (wp_posts.
ID = pm.post_id) WHERE p.post_type = 'dog' AND p.post_status = 'publish' AND pm.meta_key = '_meta_general' AND POSITION(';s:6:\"weight' IN CAST(pm.meta_value AS CHAR)) Between the WP Metadata API, WP_Query(), and the versatile $wpdb object, there is no shortage of ways to retrieve Metadata from your WP database(s).
The method that you select should be based on your specific requirements at that time.
In Word Press (WP), the meaning of Metadata is a bit fuzzier.
It stores post metadata such as custom fields and additional metadata added via plugins in the wp_postmeta table.
Under the covers Word Press employ’s the serialize() PHP function to store arrays as a serialized string.
In the database, the meta_value might look something like this: For that reason, it’s best to use the WP_Query() object to fetch serialized data.
Before we start writing queries to get at WP metadata, let's take a closer look at some of the three main types of metadata: Of course the list isn't limited to these types.If you know the structure of the serial string, it is possible to search for a specific value in the string such as ‘;s:6:"weight’.You can then return the next 10 characters such as an “xx/xx/xxxx”-formatted date. ID , MID( CAST(wp_postmeta.meta_value AS CHAR), POSITION(';s:6:\"weight' IN CAST(_postmeta.meta_value AS CHAR) ), 10 ) AS dres FROM wp_posts p INNER JOIN wp_postmeta pm ON (p.For instance, say that the metadata is stored as a number.If you wanted to fetch posts whose ‘category’ meta_value is greater than 10, you should cast it as a number before testing it: SELECT wp_posts.* FROM wp_posts p INNER JOIN wp_postmeta pm ON (p.