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void exec(String sql, Callback cb, String[] params) The params array corresponds to %q or %Q parameters in the SQL statement. An example is shown in Listing 8-19. Listing 8-19. The exec_query() Function public static void exec_query(SQLite.Database db) throws SQLite.Exception { System.out.println("\nExec Query:\n"); String sql = "insert into foods (type_id, name) values (5, '%q')"; ResultSet result = new ResultSet(); String params[] = {"Java"}; db.exec(sql, result, params); System.out.println("Result: last_insert_id(): " + db.last_insert_rowid()); System.out.println("Result: changes(): " + db.changes());

The ASP .NET worker process needs Full Control security-level access to the folder that stores the Local Computer certificates. Click the lower button in the X.509 Certificate Tool page that is labeled View Private Key File Properties to open property pages for the folder. Switch to the Security tab to display the list of users who have access to the folder. Add the account that is assigned to the ASP .NET worker process and give it Full Control permissions. By default, on Windows XP/2000 under IIS 5.0, the worker process runs under a machine account called ASP .NET. On Windows Server 2003 the worker process usually runs under the NETWORK SERVICE account. Figure 5-6 shows what the Security tab looks like once you have added the ASP .NET worker process account.

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The UI must update any references from the old business object to the newly updated business object as soon as the new object is returned from the data portal.

Figure 2-20. UML sequence diagram for the updating of a business object In a physical n-tier configuration, the business object is automatically passed by value to the server, and the updated version is returned by value to the client. If the server-side data portal is running locally, however, the object is cloned, and the clone is updated and returned to the calling code. This is necessary because it is possible for the update process to fail halfway through. If your business object contains other business objects, some might have been changed during the update process, while others are unchanged. The database transaction will ensure that the database is in a consistent state, but your object model can be left in an inconsistent state. By saving a clone, if the update fails, the UI is left referencing the original unchanged object, which is still in a consistent state.

Note that this is not the same thing as parameter binding. Rather, this is sprintf style substitution using sqlite3_vmprintf() in the SQLite C API.

The final operation, and probably the simplest, is to delete an object from the database. The framework actually supports two approaches to deleting objects. The first approach is called deferred deletion. In this model, the object is retrieved from the database and is marked for deletion by calling a Delete() method on the business object. Then the Save() or BeginSave() method is called to cause the object to update itself to the database (thus actually doing the Delete operation). In this case, the data is deleted by the DataPortal_DeleteSelf() method. The second approach, called immediate deletion, consists of simply passing criteria data to the server, where the object is deleted immediately within the DataPortal_Delete() method. This second approach provides superior performance because you don t need to load the object s data and return it to the client. Instead, you simply pass the criteria fields to the server, where the object deletes its data.

Figure 5-6. Security settings for the folder that stores the Local Computer certificates and keys The X.509 Certificate Tool provides the base64-encoded key identifier for the certificate. You will need this identifier in the code listings in order to retrieve the correct certificate. Listing 5-7 shows you how to retrieve a certificate from the certificate store using its key identifier.

The SQLite.Function interface is used to implement both user-defined functions and user-defined aggregates. The hello_newman() function in Java is illustrated in Listing 8-20. Listing 8-20. hello_newman() in Java class HelloNewman implements SQLite.Function { public void function(FunctionContext fc, String args[]) { if (args.length > 0) { fc.set_result("Hello " + StringUtil.join(args, ", ")); }

The framework supports both models, providing you with the flexibility to allow either or both in your object models, as you see fit. Deferred deletion follows the same process as the update process I just discussed, so let s explore immediate deletion. In this case, a criteria object is created to describe the object to be deleted, and the data portal is invoked to do the deletion. Figure 2-21 is a UML diagram that illustrates the process.

else { fc.set_result("Hello Jerry"); }

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