How to store the entered data into a remote database?
I'm assuming you want to communicate with the remote server through API.To Send POST and GET request to the server, means to create a connection between the server and Android Application.There are many libraries to make HTTP request for example Retrofit,Volley etc, These powerful libraries make it easy to consume JSON or XML data.You can send your data and store them in the remote database.
You can follow the tutorials for better understanding link1,link2.
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I want the users of my app to view an internet database, download some records of it into the database that is built in the app (not online db) and also to be able to upload some records to the online database.
I already have the database inside my app and my question is how can I make an online database that my android app could see, download from and upload to?
Android supports JDBC poorly - or let's be honest, not at all. Your best option is to create a Web server that wraps your database to a REST API. PHP is the most common language, while not the best, a lot of tutorials and snippets are available, so I would go with that. You'll have to wrap your database requests into HTTP requests and send it to the server.
For every query you'll plan on running, you'll have to create a PHP script that receives the HTTP parameters, builds the SQL query, and creates a structured XML or JSON response from the received data. This XML or JSON will than be sent to the Android client where you can parse it and obtain the data, do your syncing or such. I would suggest JSON, it's easier to read when debugging, consumes less bandwidth and has an easy to use parser in the Android API.
An easy lecture on PHP web service basics.
On using databases from PHP.
HTTP in Android.
JSON in Android.
Your online database should be on some server and you need to write a webservice to communicate your app to this online database(downloading and uploading purposes). your websrvice will also be hosted on some server. You then will be making webservice calls from your app to perform required modification to the online database.
In my application I am having database stored on the web server, I want to fetch particular values of record stored in SQL database. After getting that values want to update these values in the record stored in SQLite database of android.
Scope of question is very broad can't answer in few lines, but can give you idea. For achieving above functionality there is no any such mechanism so that android client (like tablet/mobile) directly get connected to web servers. For making this happen you need to write web services at server side which will take request from android client, process it as per request types and returns the resulted processed data. You can consume this web response at client side and do operations like saving it in Sqlite database. Similarly you can sync local sqlite database with server via web services only. You can easily consume Restful web services using Retrofit or Volley.
I would know how many and which are the possibile system for saving data from android application to remote sql server. I know just one way: Web service. Are there other systems?
I myself use PHP scripts and HTTP Requests. You do not want to have the app establish a direct connection to the server, because that would require database usernames and passwords sotred in the app. Use POST or GET methods to post data, and then in the PHP, echo out the results of the script and then decode them in your app.
REST + JSON. Check them out:
http://en.wikipedia.org/wiki/Representational_state_transfer
and
http://en.wikipedia.org/wiki/JSON
Backend server has tables, and the android client have the same tables. Are there any way to synchronize data between them?
From your question I understand that There are tables on mobile and server both are same. Now you want to take a data from server from mobile and from to Server. Use upload and Download. When your application get started download the data from the server Process on that data after that upload that data to the server. so that both your mobile and server db remain updated.
for upload and download you can use following links:
http://blog.sptechnolab.com/2011/02/10/android/android-connecting-to-mysql-using-php/
http://www.vogella.de/articles/AndroidJSON/article.html
You have to use the JSON.
I'm in urgent need of help with a project.
I need to develop an android client, and I don't know how to get data from a database through the internet.
Could I use a socket or maybe send a http request?
Can I query the database on the client directly?
Do you mean a raw MySQL database? If you want to connect over a raw socket you would need a MySQL client on the android, I suggest looking up libraries in whatever language you are using.
Depending on what you're doing, an alternative is creating a web server that will query the database and format some results for you. You could fetch this over http and display it directly. Or you could have the server encode it into json and manipulate that on the android device.