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Figure 23-3. The result of saving the context There is no magic in the preceding example. Under the covers, a connection to the database is made, a proper SQL statement is generated, and so forth. The benefit of EF is that these details are handled on your behalf. Now let s look at the core services of EF that make this possible.

You defined permissions in hook_permission(), but how are they enforced Node modules can limit access to the node types they define using hook_node_access(). The superuser (user ID 1) will always bypass any access check, so this hook isn t called in that case. If this hook isn t defined for your node type, all access checks will fail, so only the superuser and those with administer nodes permissions will be able to create, edit, or delete content of that type. /** * Implements hook_node_access(). */ function job_node_access($op, $node, $account) { $is_author = $account->uid == $node->uid; switch ($op) { case 'create': // Allow if user's role has 'create joke' permission. if (user_access('create job', $account)) { return NODE_ACCESS_ALLOW; } case // // if 'update': Allow if user's role has 'edit own joke' permission and user is the author; or if the user's role has 'edit any joke' permission. (user_access('edit own job', $account) && $is_author || user_access('edit any job', $account)) { return NODE_ACCESS_ALLOW; } 'delete': Allow if user's role has 'delete own joke' permission and user is the author; or if the user's role has 'delete any joke' permission. (user_access('delete own job', $account) && $is_author || user_access('delete any job', $account)) { return NODE_ACCESS_ALLOW; }

The EF API sits on top of the existing ADO.NET infrastructure you have already examined in the previous two chapters. Like any ADO.NET interaction, the entity framework uses an ADO.NET data provider to communicate with the data store. However, the data provider must be updated so it supports a new set of services before it can interact with the EF API. As you might expect, the Microsoft SQL Server data provider has been updated with the necessary infrastructure, which is accounted for when using the System.Data.Entity.dll assembly.

Note Many third party databases (e.g., Oracle and MySQL) provide EF-aware data providers. Consult your database vendor for details or log onto www.sqlsummit.com/dataprov.htm for a list of known ADO.NET data providers.

The preceding function allows users to create a job post node if their role has the create job post permission. They can also update a job post if their role has the edit own job post permission and they re the node author, or if they have the edit any job post permission. Those with delete own job post permission can delete their own job post, and those with delete any job post permission can delete any node of type job post. One other $op value that s passed into hook_node_access() is view, allowing you to control who views this node. A word of warning, however: hook_node_access() is called only for single node view pages. hook_node_access() will not prevent someone from viewing a node when it s in teaser view, such as a multinode listing page. You could get creative with other hooks and manipulate the value of $node>teaser directly to overcome this, but that s a little hackish. A better solution is to use hook_node_grants(), which we ll discuss shortly.

In addition to adding the necessary bits to the Microsoft SQL Server data provider, the System.Data.Entity.dll assembly contains various namespaces that account for the EF services themselves. The two key pieces of the EF API to concentrate on for the time being are object services and entity client.