Optimizing the speed and load performance of SQLite in Phonegap

As someone who is new to Android programming, I am seeking advice on how to optimize the performance of my phonegap SQLite application. Currently, it takes 30 seconds to load 150 words when I hit the refresh button. Can anyone provide tips on how to enhance this experience?

I aim to expand the database content to 500 words and display them without needing to manually refresh. Is there a way to achieve this functionality?

    function init() {
        document.addEventListener("deviceready", onDeviceReady, true);
    }  
function onDeviceReady() {
    var db = window.openDatabase("Database", "1.0", "SQLite Database", 200000);
    db.transaction(populateDB, errorCB, successCB);
}

 $(document).ready(function(){

            document.addEventListener("deviceready", onDeviceReady, false);

            var db = window.openDatabase("Database", "1.0", "KamusDB", 200000);

           // Rest of the code goes here...

        });
        </script>

    </head>

    <!-- Index Page Start -->
    <div data-role="page" id="index">
        <div data-role="header" data-position="fixed" data-theme="e">
         <a href="#" class="refresh" data-role="button" data-icon="refresh" data-theme="a" title="Refresh">Refresh</a>
     
             <a href="#right-panel" data-role="button" data-icon="home" data-theme="a" title="Menu" >Menu</a>
        </div>
       //Rest of the code for Index Page goes here... 

     </div>
     <!-- Index Page End -->

    <!-- Data Display Page Start -->
    <div data-role="page" id="displayDataPage">
      
          //Code for Data Display Page...



     </div>
    <!-- Data Display Page End -->

    

     </div>


</body>

Answer №1

Here are a few important points to consider:

  • Instead of making multiple individual INSERT queries, try combining them into one execution for better performance. Here's an example:

Execute multiple INSERTs in a single transaction:

tx.executeSql('INSERT INTO MyContacts (id, name, country) VALUES (1, "John", "USA");
INSERT INTO MyContacts (id, name, country) VALUES (2, "Maria", "Brazil");');
  • Make sure your SELECT query is placed within the success callback of the combined inserts:

Like this:

tx.executeSql('<inserts here>', [], function(tx) {
  tx.executeSql('SELECT id, name, country FROM MyContacts ORDER BY name', [], querySuccess, errorCB);
});

If you're still experiencing issues, consider adding alerts to track the start and end times of your SQL queries to identify any potential bottlenecks.

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