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Building a Custom TinyWebDB Service

Learn how to create your own web service for App Inventor using TinyWebDB, avoiding data overwrite and sharing limitations. Follow step-by-step instructions to set up and deploy your service on Google's App Engine servers. Test and integrate your custom service to store and retrieve data efficiently.

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Building a Custom TinyWebDB Service

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  1. Working with Databases (II)靜宜大學資管系 楊子青2013.4.22.

  2. Creating a Custom TinyWebDB Service • http://beta.appinventor.mit.edu/learn/reference/other/tinywebdb.html • TinyWebDB is an App Inventor component that allows you to store data persistently in a database on the web. • By default, the TinyWebDB component stores data on a test service provided by App Inventor, http://appinvtinywebdb.appspot.com/ . • This service is helpful for testing, but it is shared by all App Inventor users, and it has a limit of 1000 entries. If you use it, your data will be overwritten eventually. • For most apps you write, you'll want to create a custom web service that isn't shared with other App Inventor apps and programmers.

  3. To create your own web service • Follow these instructions: • Download App Engine for Python at http://code.google.com/appengine/ . (之前需先下載Python) • After installing it, run the GoogleAppEngineLauncher by clicking its icon. • Download this sample code and Unzip the downloaded zip file. • It is a zip file containg the source code for your custom tinywebdb web service. (檔案有問題，改找appinventordb.zip) • In the GoogleAppEngineLauncher, choose File | Add Existing Application . • Browse to set the Path you just unzipped. • Then click the Run button. This will launch a test web service that runs on your local machine. • You can test the service by opening a browser and entering “localhost:8080” as the URL. You‘ll see the web page interface to your web service. (如果瀏覽器無法顯示，也沒有關係)

  4. To create your own web service (Cont.) • Follow these instructions: • Your app is not yet on the web. You need to upload it to Google's App Engine servers. • In the GoogleAppEngineLauncher, choose Dashboard . • Enter your Google account information and you'll be taken to an App Engine dashboard. • Choose Create an Application . • You'll need to specify a globally unique Application Identifier. • Provide a name to your app and click Create Application to submit. • Edit the file app.yaml. • Modify the first line so that the application matches the application identifier • In GoogleAppEngineLauncher, choose Deploy and follow the steps. • Test to see if your app is running on the web. In a browser, enter myapp.appspot.com, only substitute your identifier for "myapp". • It’s on the web and you can access it from your App Inventor for Android app.

  5. To create your own web service (Cont.) • Follow these instructions: • Your App Inventor apps can store and retrieve data using your new service. Just do the following: • Drag in a TinyWebDB component into the Component Designer. • Modify the ServiceURL property from the default http://appinvtinywebdb.appspot.com/ to your web service. • Any StoreValue operations (blocks) will store data at your service, and any GetValue operations will retrieve from your service.

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