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Sharing Prefixed Tables
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The key to telling Drupal about table prefixes is found in the settings.php file for your site. The $db_prefix variable is set to an empty string by default. You must edit the settings.php file and assign $db_prefix a value if you intend to use prefixed tables. For example, if you ran the prefix.sh script with the prefix db1_, you should update the $db_prefix variable like this: $db_prefix = 'db1_';
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As each site can have its own prefix, and you can import many prefixed versions of Drupal s tables into one database, this is the solution if you have only one database available from your hosting company. The $db_prefix variable is more flexible, however, and can alternatively take an array of prefixes and table names. This makes a whole different set of configurations possible. For example, the Location module (discussed in 4) comes with a zipcodes table that is quite large and is read-only. Drupal never writes data to this table; it uses the table only to look up locations. It would be redundant and wasteful to import this table for every Drupal site that you run, so an elegant solution is to have all of your Drupal installations share it. You can achieve this through use of the $db_prefix variable. When using the array syntax for $db_prefix, the keys are the names of tables and the values are the prefixes: $db_prefix = array( 'table_name1' => 'prefix1', 'table_name2' => 'prefix2', [...] ); The key default defines the default prefix that will be used for every table whose prefix isn t explicitly defined in the array. These two definitions are equal: $db_prefix = 'demo_'; $db_prefix = array('default' => 'demo_'); Now when you install the Location module, you can use the prefix.sh script to add a prefix to the zipcodes database table. This makes configurations like those shown in Listings 6-1 and 6-2 possible, where two different sites share a common table. Listing 6-1. Sharing the Zipcodes Table, Site 1 $db_prefix = array( 'default' => 'site1_', 'zipcodes' => 'shared_' ); Listing 6-2. Sharing the Zipcodes Table, Site 2 $db_prefix = array( 'default' => 'site2_', 'zipcodes' => 'shared_' ); Using this configuration, you can have two sites in the same database, each with its own separate and independent tables, with the exception of the zipcodes table, which is shared. This is a very useful approach, and the next sections offer two more suggestions for interesting opportunities to share tables.
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Sharing User Information
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The idea of an online community can be greatly enhanced if the community spans multiple sites. One problem that plagues the Internet in this respect is the requirement that visitors must log in to every site they visit, often with different usernames and passwords. With database prefixing, you can sidestep part of this problem by allowing your visitors to use the same username and password for multiple sites. Listing 6-3 shows the $db_prefix definition that makes this possible. Listing 6-3. Sharing User-Related Tables $db_prefix = array( 'default' => 'site_', 'users' => 'shared_', 'sessions' => 'shared_', 'role' => 'shared_', 'authmap' => 'shared_', 'sequences' => 'shared_', ); To share user information, follow these steps: 1. Use prefix.sh to create a new database definition file called shared.mysql with the shared_ prefix. All you really need are the definitions for the six shared_ tables from Listing 6-3. The rest of the table definitions can be deleted. 2. For every site that you want to share usernames and passwords, run prefix.sh again to create database definition files that each has a unique prefix that corresponds to an individual site. 3. Import all of the database definitions into the same database. 4. For each site, you will need a separate subdirectory in the sites folder, as described earlier in this chapter. 5. For each site, update settings.php with the code from Listing 6-3 for the $db_prefix variable. Update the value given for 'default' to match the prefix of the particular site.
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Caution Sharing tables between sites has profound effects in terms of how your sites behave, and some combinations of table sharing will lead to data inconsistency and broken sites. It is a technique that is recommended only for advanced users who are intimately familiar with the inner workings of Drupal.
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