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For example, when you perform a select query against a database table, the rows are returned as part of the result, as you can see in listing 16.7, which shows the listRecords function from our sample application. In this listing, you use the returned rows to construct a rudimentary HTML table to dynamically populate the screen. There are other ways of accomplishing this task, but we kept it simple because our primary focus is on the interaction with the returned results set.

function listRecords() { ret = "<table border='1'><tr><td>Id</td><td>Name</td></tr>"; try { SQL statement db.transaction(function(tx) { tx.executeSql("select id,codename from versions", Optional parameters [], Result function function (tx,result) { try { Process result rows for (var i=0;i<result.rows.length;i++) { var row = result.rows.item(i); Work with ret += "<tr><td>" + row['id'] + one row Append "</td><td>" + row['codename'] + formatted string "</td></tr>"; } ret += "</table>"; document.getElementById('outputarea').innerHTML = ret; } catch (e) {alert(e);} }, function (tx,error) { alert("error fetching rows: " + error.message); });}); } catch (e) { alert("Error fetching rows: " + e);}

echo "There are $result[0] posts";

16

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The SQL statement is passed as the first argument B. In this case we re pulling two columns from the table called versions. The second parameter C is the Java array holding any available parameterized values. In this sample, there are no parameterized values to pass along to the transaction, but you ll see one in the next section. Upon a successful execution of the select query, the results function is invoked D. The second parameter to the results function, which is named result in this code, provides access to the returned record set. The result object contains a collection of rows. Looping over the result set is as easy as walking through an array E. Each row is pulled out of the result set F and individual columns are extracted by name G. The fourth and final argument to the transaction method is the error handler. Like the success handler, this is also a callback function that takes two parameters. The first parameter is again the transaction identifier and the second is an object representing the trapped error. With this basic understanding of the database object s transaction method, let s review the remaining functions contained in the db.js file.

If posts exist, the second element will then contain an array of arrays, each main array element containing a sub-array of four elements representing, in order, the name, e-mail, web site, and message of a post You can therefore act on this data like this:

Thus far you ve seen how to open a database, create a table, and select rows from the table. Let s round this example out with an examination of the code required to insert a row and to remove all the rows from the table. The following listing shows the saveRecord and deleteAllRecords functions.

for ($j = 0 ; $j < $result[0] ; ++$j) { for ($k = 0 ; $k < 4 ; ++$k) echo $result[1][$j][$k] "<br />"; echo "<br />"; }

real-time current levels and take corrective action if they become dangerously high We ll get into the details of the new and improved motor control circuit in 17

Save record function saveRecord(id,name) { Insert SQL try { statement db.transaction(function (tx) { tx.executeSql("insert into versions (id,codename) values ( , )", [id,name], function(tx,result) { Update count Define parameters entryCount++; document.getElementById('outputarea').innerHTML = "# of rows : " + entryCount; }, function(tx,error) { alert("Error attempting to insert row" + error.message); });}); Define

} catch (e) { alert (e); } }

8:

In this section, we re going to take a detailed look at Octavius brain, as well as his body Most of the following information will be helpful for any robotics project you undertake

function deleteAllRecords() { try { db.transaction(function (tx) { tx.executeSql("delete from versions", Delete SQL [], statement function(tx,result) { entryCount = 0; document.getElementById('outputarea').innerHTML = "# of rows : " + entryCount; }, function(tx,error) { alert("Error attempting to delete all rows" + error.message); });}); } catch (e) { alert (e); } }

This code loops through all main elements in the array $result[1], with $result[1][0] being the first element of this array, and itself being an array with the following elements:

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