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March 26, 2012 12:54
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PhoneGap sqlite working example
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Hi | |
I hope this helps you all get started with phonegap and sqlite in your | |
application | |
Dean-O | |
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" | |
"http://www.w3.org/TR/html4/strict.dtd"> | |
<html> | |
<head> | |
<!-- | |
This is an example that shows how to create an application that uses | |
an embedded sqlite database | |
in a mobile device (iphone,ipod,ipad,android using phonegap, jquery | |
and sqlite. | |
Your phonegap project will already contain the phonegap.js. | |
You will need to download and add to your project the jquery.min.js | |
file | |
The application will create a database called WebSqlDb with a | |
table in it called User, which contains three fields UserId, | |
FirstName and LastName | |
When the application is run the firsttime, if the local database does | |
not exist, the application | |
will create the database and the table. | |
The application shows two text boxes which you can use to add values | |
to the database using the add record button | |
The application also has a refresh button which will get the data from | |
the database and show it on the screen | |
When the application is run on the device the onBodyLoad() function is | |
called, which sets up the database and table | |
The Add Record button calls the AddValueToDB() function | |
The Refresh button calls the ListDBValues() function | |
There are a few alert statements in this application, which are only | |
there for debuggin purposes. They look like this | |
alert("DEBUGGING: followed by some text"); | |
These are only in the application to indicate where the application is | |
at when it is processing functions, etc | |
You will need to comment these out before you deploy/sell your | |
application | |
--> | |
<!-- Change this if you want to allow scaling --> | |
<meta name="viewport" content="width=default-width; user- | |
scalable=no" /> | |
<meta http-equiv="Content-type" content="text/html;charset=utf-8"> | |
<title>Embedded Sql Example</title> | |
<!-- include the next line to use phonegap javascript functions --> | |
<script type="text/javascript" charset="utf-8" src="phonegap.js"></ | |
script> | |
<!-- include the next line to use jquery functions in your application | |
you must download this and include the directory your html file is in | |
--> | |
<script type="text/javascript" charset="utf-8" src="jquery.min.js"></ | |
script> | |
<!-- main scripts used in this example --> | |
<script type="text/javascript" charset="utf-8"> | |
// global variables | |
var db; | |
var shortName = 'WebSqlDB'; | |
var version = '1.0'; | |
var displayName = 'WebSqlDB'; | |
var maxSize = 65535; | |
// this is called when an error happens in a transaction | |
function errorHandler(transaction, error) { | |
alert('Error: ' + error.message + ' code: ' + error.code); | |
} | |
// this is called when a successful transaction happens | |
function successCallBack() { | |
alert("DEBUGGING: success"); | |
} | |
function nullHandler(){}; | |
// called when the application loads | |
function onBodyLoad(){ | |
// This alert is used to make sure the application is loaded correctly | |
// you can comment this out once you have the application working | |
alert("DEBUGGING: we are in the onBodyLoad() function"); | |
if (!window.openDatabase) { | |
// not all mobile devices support databases if it does not, the | |
following alert will display | |
// indicating the device will not be albe to run this application | |
alert('Databases are not supported in this browser.'); | |
return; | |
} | |
// this line tries to open the database base locally on the device | |
// if it does not exist, it will create it and return a database | |
object stored in variable db | |
db = openDatabase(shortName, version, displayName,maxSize); | |
// this line will try to create the table User in the database just | |
created/openned | |
db.transaction(function(tx){ | |
// you can uncomment this next line if you want the User table to be | |
empty each time the application runs | |
// tx.executeSql( 'DROP TABLE User',nullHandler,nullHandler); | |
// this line actually creates the table User if it does not exist | |
and sets up the three columns and their types | |
// note the UserId column is an auto incrementing column which is | |
useful if you want to pull back distinct rows | |
// easily from the table. | |
tx.executeSql( 'CREATE TABLE IF NOT EXISTS User(UserId INTEGER NOT | |
NULL PRIMARY KEY, FirstName TEXT NOT NULL, LastName TEXT NOT NULL)', | |
[],nullHandler,errorHandler); | |
},errorHandler,successCallBack); | |
} | |
// list the values in the database to the screen using jquery to | |
update the #lbUsers element | |
function ListDBValues() { | |
if (!window.openDatabase) { | |
alert('Databases are not supported in this browser.'); | |
return; | |
} | |
// this line clears out any content in the #lbUsers element on the | |
page so that the next few lines will show updated | |
// content and not just keep repeating lines | |
$('#lbUsers').html(''); | |
// this next section will select all the content from the User table | |
and then go through it row by row | |
// appending the UserId FirstName LastName to the #lbUsers element | |
on the page | |
db.transaction(function(transaction) { | |
transaction.executeSql('SELECT * FROM User;', [], | |
function(transaction, result) { | |
if (result != null && result.rows != null) { | |
for (var i = 0; i < result.rows.length; i++) { | |
var row = result.rows.item(i); | |
$('#lbUsers').append('<br>' + row.UserId + '. ' + | |
row.FirstName+ ' ' + row.LastName); | |
} | |
} | |
},errorHandler); | |
},errorHandler,nullHandler); | |
return; | |
} | |
// this is the function that puts values into the database using the | |
values from the text boxes on the screen | |
function AddValueToDB() { | |
if (!window.openDatabase) { | |
alert('Databases are not supported in this browser.'); | |
return; | |
} | |
// this is the section that actually inserts the values into the User | |
table | |
db.transaction(function(transaction) { | |
transaction.executeSql('INSERT INTO User(FirstName, LastName) | |
VALUES (?,?)',[$('#txFirstName').val(), $('#txLastName').val()], | |
nullHandler,errorHandler); | |
}); | |
// this calls the function that will show what is in the User table in | |
the database | |
ListDBValues(); | |
return false; | |
} | |
</script> | |
</head> | |
<body onload="onBodyLoad()"> | |
<h1>WebSQL</h1> | |
<input id="txFirstName" type="text" placeholder="FirstName"> | |
<input id="txLastName" type="text" placeholder="Last Name"> | |
<input type="button" value="Add record" onClick="AddValueToDB()"> | |
<input type="button" value="Refresh" onClick="ListDBValues()"> <br> | |
<br> | |
<span style="font-weight:bold;">Currently stored values:</span> | |
<span id="lbUsers"></span> | |
</body> | |
</html> |
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Thanks. for the example