Updated version version 8/8/2015
Orders are a custom message type. From WooCommerce Post Types :
Orders live in the wp_posts table ( post_type = 'shop_order' ). Additional data is available by looking at the post_id order in the wp_postmeta table.
In addition, WooCommerce Installed Database Tables
- woocommerce_order_items - order items are stored in a table to make them easily accessible for reports
- woocommerce_order_itemmeta strong>. The metal of the order item is placed in the table to store additional data.
The current version of WordPress is WooCommerce version 2.4.x
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