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Changing Existing Schemas with hook_schema_alter()

Next we will add methods to individual Customer instances. To do so in Python, we make use of a standard Python module called types. Before we can use that module, we need to do a few things so that the IronPython runtime will be able to locate the module. First, the types module is not included as part of the DLR source code. In order to run the code in Listing 8-9, you need to download IronPython from http://ironpython.codeplex.com and install it. I downloaded IronPython 2.6.1 for .NET 4.0 and installed it in C:\Program Files (x86)\IronPython 2.6 for .NET 4.0. If you install it in a different folder, you ll need to modify the path in line 2 of Listing 8-9 accordingly. The installation of IronPython places the standard Python types module in C:\Program Files (x86)\IronPython 2.6 for .NET 4.0\Lib. That s the path we need to add to Python s system path so that the IronPython runtime knows to look there for modules we want to import. So in line 2 of Listing 8-9, we add the path to Python s system path. In line 3 we import the

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Generally modules create and use their own tables. But what if your module wants to alter an existing table Suppose your module absolutely has to add a column to the node table. The simple way would be to go to your database and add the column. But then Drupal s schema definitions, which should reflect the actual database table, would be inconsistent. There is a better way: hook_schema_alter(). Suppose you have a module that marks nodes in some way, and for performance reasons, you are dead set on using the existing node table instead of using your own table and joining it using node IDs. Your module will have to do two things: alter the node table during your module s installation and modify the schema so that it actually reflects what is in the database. The former is accomplished with hook_install(), the latter with hook_schema_alter(). Assuming your module is called markednode.module, your markednode.install file would include the following functions: /** * Implements hook_install(). */ function markednode_install() { $field = array( 'type' => 'int', 'unsigned' => TRUE, 'not null' => TRUE, 'default' => 0, 'initial' => 0, // Sets initial value for preexisting nodes. 'description' => t('Whether the node has been marked by the markednode module.'), ); // Create a regular index called 'marked' on the field named 'marked'. $keys['indexes'] = array( 'marked' => array('marked') ); db_add_field('node', 'marked', $field, $keys); } /** * Implements hook_schema_alter(). We alter $schema by reference. * * @param $schema * The system-wide schema collected by drupal_get_schema(). */

into finer combinations and allow more control over who is allowed to do what functions to an object on a disk. Table 10-1 describes the standard permissions available in Windows Vista. Table 10-1 Windows Vista Standard Permissions

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