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  • Book Overview & Buying Drupal 7 First Look
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Drupal 7 First Look

Drupal 7 First Look

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Drupal 7 First Look

Drupal 7 First Look

4.5 (4)

Overview of this book

Drupal 7 contains features for which site administrators have been clamoring for years, including support for fields, an improved administration interface, better database support, improved theming, and more. You could of course make a laborious search on sites, blogs, and many online tutorials that would promise to update you about every new feature, but there's an even better way to know all about Drupal 7's new features: Drupal 7 First Look is the first and only book that covers all of the fantastic new features in Drupal 7 in depth and covers the process of upgrading your Drupal 6 site to Drupal 7. If you've used Drupal 6 and want to use Drupal 7, you need this book.Drupal 7 First Look takes an in-depth look into all of the major new features in Drupal 7 so you can quickly take full advantage of Drupal 7. It also assists you in upgrading your site to Drupal 7. Some of the new features in Drupal 7 include: Fields API, based on Drupal 6 CCK, which allows you to easily build your own content types Improved user interface for administering your website Built-in support for working with images and files Improved security for the site and users of the site Completely rewritten database layer DBTNG to make working with the database easier and more secure. Improved API for custom module development and user interface theming
Table of Contents (13 chapters)
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Drupal 7 First Look
Credits
About the Author
About the Reviewer
Preface
1
Index

merge statement syntax


A merge query attempts to automatically determine whether a record should be inserted or updated depending on whether a record already exists in a database matching a unique key for the table. Because many databases do not implement merges in a standard method, the DBTNG layer delegates much of the implementation to the database driver.

To create a merge statement, you begin by calling db_merge, which has the following signature:

db_merge($table, array $options = array())

Just like the other methods we have looked at so far, you begin the query by passing in the name of the table that you are working with. After you create the query, you must tell Drupal how to determine whether a record already exists in the database or not. This is done by calling the key method with an associative array with the name of the field or fields that should be checked as well as the existing values that need to be checked. Finally, you need to specify the values for each field that need...

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Drupal 7 First Look
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