The document provides an overview of the WordPress and WooCommerce database structure. It discusses the general WordPress architecture, including its use of MySQL tables prefixed with "wp_", and key tables like wp_posts and wp_users. It also outlines the WooCommerce database structure, noting it uses core WordPress tables for products and orders, along with custom tables prefixed with "woocommerce_".

1. Understanding
WordPress/WooCommerce
Database
George Georgopoulos, Papaki
Full Stack Web Developer & WP enthusiast
https://github.com/ggeorg0p
Heraklion
10/12/2016

2. Introduction
● High Level approach
● No Multisite
● No Optimization
● Outline
○ WordPress Core
■ General Architecture
■ Table Structure
○ WooCommerce DB

3. https://codex.wordpress.org/File:WP4.4.2-ERD.png

4. General Architecture [WP 4.6.1]
● MySQL version >=5.6 OR MariaDB version >=10.0
● Default prefix: “wp_”
● 12 tables
● Table “wp_links” no longer used in core
● Hybrid entity/object-oriented and key-value store
● Unique IDs (primary key: bigint[20] unsigned) for each entity within a table
(Post/User/Comment/Term ID)

5. Table Structure [WP 4.6.1]
● wp_{object}s tables
○ Main tables are modelled after the object they are storing:
■ wp_posts
■ wp_comments
■ wp_users
■ wp_terms
● wp_{object}meta tables
○ Each object type has a key-value meta store:
■ wp_postmeta
■ wp_usermeta
■ wp_commentmeta
■ wp_termmeta

6. Table Structure [WP 4.6.1]
● Key/Value Store (“NoSQL” like)
● A bit like a dynamic dictionary, in table form
● Values relating to objects are identified by a key
● key can be any valid varchar(255); value can be any primitive or serializable
object (PHP serialize function).
● WP_OPTIONS
○ option_id bigint(20)
○ option_name varchar(64) <= key
○ option_value longtext <= value
○ autoload varchar(20)

7. Table Structure [WP 4.6.1]
Terms, Term Taxonomies, and Term Relationships
● Legacy Issues
● wp_terms/wp_termmeta: the Term Object/Data
● wp_term_taxonomy: Taxonomy Assignment
● wp_term_relationships: Object relationships
○ object_id
○ term_taxonomy_id
○ term_order

8. WooCommerce [2.6.8]
● Uses Core WP tables for products, coupons, orders, and webhooks
● wp_posts/wp_postmeta/taxonomies
● Vertical structure (Horizontal coming in version 3)
Custom tables
(“wp_” prefix)
woocommerce_sessions woocommerce_tax_rate_locations
woocommerce_api_keys woocommerce_shipping_zones
woocommerce_attribute_taxonomies woocommerce_shipping_zone_locations
woocommerce_tax_rates woocommerce_shipping_zone_methods
woocommerce_order_items woocommerce_payment_tokens
woocommerce_order_itemmeta woocommerce_payment_tokenmeta
woocommerce_downloadable_product_permissions

9. Thank You :)
Any Questions?
George Georgopoulos, Papaki
Full Stack Web Developer & WP enthusiast
https://github.com/ggeorg0p