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The preceding example of listing nodes is a common task for contributed modules (though less so now that the views module makes it so easy to define node listings through the Web). Question: If a node access control module is enabled on the site, where is the code in the preceding example that makes sure our user sees only the subset of nodes that is allowed You re right . . . it s completely absent. The preceding code will show all nodes of a given type, even those protected by node access modules. It s arrogant code that doesn t care what other modules think! Let s change that. Before: $sql = "SELECT title FROM {node} WHERE type = '%s' AND status = 1"; $result = db_query($sql, $type); After: $sql = "SELECT n.nid, title FROM {node} n WHERE type = '%s' AND status = 1"; $result = db_query(db_rewrite_sql($sql), $type); // Respect node access rules.

We ve wrapped the $sql parameter for db_query() in a call to db_rewrite_sql(), a function that allows other modules to modify the SQL. Queries that pass through db_rewrite_sql() need to have their primary field (n.nid) and table alias (n) stated in the query, so we ve added them to the SQL. A significant example of a module that rewrites queries against the node table is the node module. It checks to see if there are entries in the node_access table that might restrict a user s access to nodes and inserts query fragments to check against these permissions. In our case, the node module will modify the SQL to include an AND in the WHERE clause that will filter out results to which the user does not have access. See 5 to see how this is done and for more about db_rewrite_sql().

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Note Our sample application relies on being the only application that stores values into the session storage area. If your application needs to share the storage object with other data, you will need to use a more nuanced key strategy than simply storing the keys at root level. We ll look at another storage strategy in the Practical Extras section.

The PureMVC framework is designed to represent the application in three tiers to separate coding responsibilities into those tiers. The facade is also a singleton that is created to provide a single interface for communication throughout the application. Figure 7-1 illustrates the core objects in PureMVC and their relationships.

If you have a varying number of values in your SQL that cannot be determined until runtime, it doesn t excuse you from using placeholders You ll need to create your SQL programmatically using placeholder strings such as '%s' or %d, and then pass along an array of values to fill these placeholders If you re calling db_escape_string() yourself, you re doing something wrong Here s an example showing the generation of placeholders, supposing that we want to retrieve a list of published node IDs and titles from nodes matching certain node types: // $node_types is an array containing one or more node type names // such as page, story, blog, etc $node_types = array('page', 'story', 'blog'); // Generate an appropriate number of placeholders of the appropriate type $placeholders = db_placeholders($node_types, 'text'); // $placeholders is now a string that looks like '%s', '%s', '%s' $sql = "SELECT nnid, n.

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