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This plug-in saves a user s details in a MySQL database If the data table used doesn t already exist, it even creates it for you so there s minimum setup required So why MySQL Well, so far in this book I ve concentrated on using flat text files for storing data on the server This is a quite adequate solution for small applications and utilities, and it saves on having to configure and maintain a database such as MySQL Indeed, had I gone the database route (or if you ve been experimenting with the plug-ins), you d probably have dozens of databases residing within MySQL Instead, you should only have a collection of text files, which you can simply delete when you don t want them any more However, the time comes when the benefits of using a database begin to outweigh those of not doing so, and this plug-in, which allows thousands of users and several fields per user, is such a case Yes, I could have used a text file and split all records at line breaks, separating out the fields with a special token But the code required to support such a system would never run as fast or be as flexible as using a database Figure 9-1 shows this plug-in in action with a user being added twice to the database, the duplicate checking ensuring that the second insertion is ignored

Using bit variables in your program can be a powerful technique, but, as mentioned, if you do this, it s important to remember that the associated

You ve done a lot of setup, and now it s time to look at the code that performs the update of the underlying widget-specific hosted application status data.

FIGURE 9-1

17.8.3 Updating the widgets, finally!

9:

into which you want to place the data byte referenced by data Assuming you want to avoid the locations occupied by the general-purpose variables, the available locations would be 28 to 47, for the 08M2, or 28 to 255 for the other M2 processors For example, if you wanted to temporarily store the current value of b0 in storage location 28 of any M2 chip so that you could use that variable for another purpose, you could write poke 28, b0 The basic syntax for the peek command is similar: peek location, variable Location has the same meaning as it does in the poke command, and variable is the variable into which you want to place the data byte that s stored at location (Again, there are more advanced forms of the peek command; see the manual for details) For example, if you now want to retrieve the value of b0 that you had earlier placed in storage location 28, you could write peek 28, b0 The second way of accessing data in the storage locations is more complicated In order to understand it, we need to first discuss the specialfunction variables available on the M2 processors

Once the SiteMonitorService code is in control, updating the widgets is rather easy. Updating the SiteMonitorModel data is the sole responsibility of the SiteMonitorService. To accomplish this task, the SiteMonitorService performs these basic operations:

This plug-in inserts a record into a MySQL database If the database table does not already exist, it creates it first Upon success, a value of 1 is returned Otherwise, -1 is returned if the insert failed, or -2 if the handle already exists It requires these arguments: $table The name of the data table $nmax The maximum length allowed for $name $hmax The maximum length allowed for $handle $salt1 Semi-random string to help secure the password $salt2 A second string to go with $salt1 $name The user s full name to add to the database $handle The user s username $pass The user s password $email The user s e-mail address

1 2 3

TABLE 4-2

Starts a thread to perform the update Updates each of the sites in turn Shuts itself down to conserve resources

At the start of this plug-in, the query required to create the table named by $table is put together For example, assuming that names are allowed 32 characters and handles 16, then the command-line MySQL statements in the query would be as follows:

The Service creates a separate Thread for performing the update, because by default the Service attempts to run on the main GUI thread of the device. Running in a separate Thread of execution inside a Service is arguably the best place to perform a potentially blocking operation such as the operation required of the SiteMonitorService. Let s look at the code structure of the SiteMonitorService class.

Special-Function Variables of the M2-Class Processors Function real-time elapsed seconds portB data direction register portC data direction register portB input pins portC input pins portB output pins portC output pins byte scratchpad pointer byte scratchpad value pointed to by bptr byte scratchpad value pointed to by bptr (post increment) byte scratchpad value pointed to by bptr (post decrement)

CREATE TABLE IF NOT EXISTS Users ( name VARCHAR(32), handle VARCHAR(16), pass CHAR(32), email VARCHAR(256), INDEX(name(6)), INDEX(handle(6)), INDEX(email(6)) );

package com.msi.unlockingandroid.sitemonitor; import import import import import import import import import import import android.app.Service; android.content.ComponentName; android.content.Context; android.content.Intent; android.os.IBinder; android.util.Log; android.appwidget.AppWidgetManager; java.io.BufferedReader; java.io.InputStreamReader; java.net.HttpURLConnection; java.net.URL;