Presented at WordUp AZ, this was a quick intro to using $wpdb to work with your own database tables from inside WordPress

1. Saturday, March 16, 13

2. HI, I’M JOHN
• Founder @ 9seeds.com
• WordPress Developer
• Viva, Las Vegas
Saturday, March 16, 13

3. The Problem
You’ve got database tables you
need to access from inside wordpress
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4. What are my options?
• Convert all the data to custom post types
• Write some (potentially) janky direct database
access queries in to your theme or plugin
• Or, you can check out $wpdb
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5. What is $wpdb?
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6. $wpdb
“WordPress provides a global variable,
$wpdb, which is an instantiation of the
class already set up to talk to the
WordPress database.”
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7. Let’s dig in!
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8. My Contacts
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9. Some Data
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10. First up
We need to tell WordPress
about our new table
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11. Adding our table
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12. Accessing our
table data
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13. get_results()
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14. Saturday, March 16, 13

15. Which turns...
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16. Into...
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17. Adding data to
our custom
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18. Start with a form
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19. Start with a form
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20. Check your nonce!
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21. ... from the codex
All data in SQL queries must be SQL-escaped
before the SQL query is executed to prevent
against SQL injection attacks. This can be
conveniently done with the prepare method.
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22. query() and prepare()
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23. Our data added
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24. This is just the
beginning!
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25. Resources
• http://codex.wordpress.org/Class_Reference/wpdb
• http://www.slideshare.net/vegasgeek
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26. Thank You!
john@9seeds.com - @vegasgeek
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