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Back when the first PICAXE chip was introduced, the majority of PCs had only parallel and serial I/O ports USB ports had already been developed, but they were not yet widely available on new PCs As a result, programs were originally downloaded from a PC to a PICAXE chip by means of a simple three-wire serial interface that s still in use today However, virtually all new Macs and PCs no longer include serial connectors, so it won t be

This output also shows another thing worth pointing out, which is that all of name, handle, and email have been given indexes by the MySQL INDEX() statement, as shown by the word MUL under the Key heading This means that, just like using a card index in a library, they will be quick to search Back to the PHP, though No semicolon is required (or even allowed) when using the mysql_query() function, so all the preceding commands are run together into a single string stored in $query, which is then passed onto the mysql_query() function If the call fails, then something has gone very wrong and so the code exits, returning an error message This will enable you to properly debug your program, but on a production server you may wish to replace the die() function call with error handling of your own By the way, did you notice the IF NOT EXISTS clause at the start of the query Using this means that the CREATE TABLE instruction will only ever be called once Thereafter, the table will already exist and the command will be ignored It s a neat way of avoiding having to issue an additional MySQL call to see whether a table exists before creating it Note that this code assumes you have already created a suitable database and a user to access it (there s more on this in the following section) So, having ensured that the table named by $table exists, a new query is placed in $query with which to check whether the user already exists in the table We need to do this to avoid filling it up with duplicates The query takes the following form (although tablename and handle would be replaced by the actual values):

Intent updateWidgetsIntent = new Intent(SiteMonitorWidgetImpl.UPDATE_WIDGETS); context.sendBroadcast(updateWidgetsIntent);

SELECT * FROM tablename WHERE handle='handle';

Log.i(SiteMonitorUpdater.tag,"Complete!"); } catch (Exception e) { Log.e(SiteMonitorUpdater.tag,"updateAlLSites::caught exception:" + e.getMessage()); e.printStackTrace(); } } private void updateOneSite(SiteMonitorModel smm,int widgetId) { try { Log.i(SiteMonitorUpdater.tag,"updateOneSite: [" + smm.getName() + "][" + widgetId + "]"); // get update report from this site's url Log.i(SiteMonitorUpdater.tag,"url is [" + smm.getUrl() + "]"); String dataFromSite = getDataFromSite(smm.getUrl()); Download, String[] data = dataFromSite.split("[|]"); parse data if (data.length == 2) { smm.setStatus(data[0]); Update smm.setMessage(data[1]); widget } data smm.setStatusDate(SiteMonitorModel.getFormattedDate()); SiteMonitorModel.saveWidgetData(context, widgetId, smm);

1

Again, the preceding is a MySQL command as you would type it into the command line just leaving off the final semicolon makes it work with mysql_query(), to which the query is passed Upon success, the mysql_query() function always returns a resource after a SELECT command, which can be used to examine the result of the query In this case the resource is returned directly to the mysql_num_rows() function, which returns a count representing the number of times the search is found in the database In this case only a single entry of any handle is allowed, so this value will be either 0 or 1 If the returned value is 1, then an entry already exists and so the function returns with a value of -2 to indicate the fact Otherwise, it is all right to proceed with inserting the data into the database First, however, the password needs to be obfuscated to protect all the users should the database get into the wrong hands This is done by converting the password into a special string called a hash using the md5() function This is a type of function that only goes one way, and so the input cannot be derived from the output In addition, to prevent attempts at

} catch (Exception e) { Log.e(SiteMonitorUpdater.tag,"updateOneSite::caught exception:" + e.getMessage()); Save widget data e.printStackTrace(); } }

Figure 1-2

private String getDataFromSite(String siteUrl) { String ret = "BAD|unable to reach site"; URL url; try { url = new URL(siteUrl); HttpURLConnection urlConn = (HttpURLConnection) url.openConnection(); BufferedReader inBuf = new BufferedReader(new InputStreamReader(urlConn.getInputStream())); String inputLine; String result = ""; int lineCount = 0; // limit the lines for the example while ((lineCount < 10) && ((inputLine = inBuf.readLine()) != null)) { lineCount++; Log.v(SiteMonitorUpdater.tag,inputLine); Talk to result += inputLine; web } server inBuf.close(); urlConn.disconnect(); return result;

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