I have a hosting account at godaddy ruinning Linux. Is has MySQL. I am creating a J2ME application that runs on android and I was wondering if there is any simpler way to connect from j2me application to my MySQL server?
Is it required to install anything at my server? which I cannot do because of the shared account. Any way to just open the connection, update some data in the MySQL from j2me application?
It is quite simple. You just need to do HTTP application/x-url-form-encoded request on the midlet and set request property to HTTP.POST. Then stream form data as bytes. Receive those post variable using a server side language (i used PHP) like $_POST['var'] and in that server script write MySQL query like insert into .. VALUES.. etc.
I don't know if any DB drivers exist for J2ME. If you can't find them just make layer on the server and implement your own protocol for retrieving data via http or sockets
Related
I have my application in Delphi with MySQL as a database. This is a Desktop application with local Database connected using ADO components.
I have another web application done in PHP and MYSQL.
I want to merge both databases and connect the Delphi application to the cloud MySQL database.
Do I need to put all my logic in PHP scripts and access them from Delphi?
How Delphi to cloud connection can be established?
You can use FireDAC to connect to a database located in the cloud, as soon as your provider allows that connectivity.
But exposing you database to the internet is not the best secure architecture. As you suggest yourself with naming it, a much better architecture is REST. The idea is to write server side software - could be PHP - to accept REST requests from a client, execute it (access the database) and send a reply to the client.
Today's, the REST requests are frequently using JSON to pass requests and receive replies. JSON is supported by Delphi. In short, this is an ASCII representation for object properties.
If accessing the database directly is what you really want, look at this video by Stephen Ball showing how to access an MS-SQL database on Azure cloud. This would be pretty well the same with mySQL.
I have been searching this topic for a long time but I haven't found the answer I wanted. I want to connect to a MySQL database on a client-server and insert some info on a table using an app I made using PhoneGap. I found things like that but didn't seem to do what I want them to do: http://docs.phonegap.com/en/2.7.0/cordova_storage_storage.md.html#SQLTransaction
This documentation page doesn't make any sense to me.
Does anyone know how can I solve my problem? Thanks in advance.
You normally don't access database on your server dirrectly from the app in your phone.
The doc you saw about SQLTransaction is about writing data to the SQLite database that is inside your device, not to write to a remote database.
What is usually done to communicate with a remote database is we perform http requests to a web server (php, java, .net, ruby, perl or whatever you like) and that server will communicate with the database server.
If you really want to communicate with your mysql server from your phonegap app, you would have to include native mysql libraries in your project and write native code to communicate with the mysql server. And I don't think it woule work very well through a data connection...
I am using phonegap to make iphone and android apps. I need to be able to store data on a mysql database on my server as well as use my websocket server.
How can I go about doing this as the app will be running on local html and javascript files which cant run ajax/websocket requests on external servers?
So let me convert my comments into an answer.
You need a client-server architecture, where the clients will be all your end devices. The server in this case needs to be a globally reachable host somewhere (Amazon cloud, perhaps?).
Your device will send updates to the backend server that has a connection to your database, using ajax calls. These updates will be stored on the server.
All your other clients need to periodically poll the same backend server using ajax, and will get the updates sent from your primary device.
I would like to create a desktop application that should work with data on a mySql server running on a remote machine.
So each user has a copy of the desktop app and edits data on the remote mySql server.
Now my problem is that the mySql server will not allow connections from other hosts.
Question, is this just the wrong way of creating the app. If not how do I give any host access to the MYsql server.
(I know I can open up for a specific IP but that won't work as the app could be running anywhere)
You should front your database on the server with a thin service layer, where you could do some validation / processing on the data, perform authentication, etc. Your client apps would then expose those methods in your service layer as web services, to which your client apps would communicate using either SOAP/XML, REST/JSON, etc. In general, it is a bad idea to expose your database directly if your application is within a LAN, and a terrible one to expose it on the internet.
We have an android app that currently sends data to a php script which writes to a mysql DB on the same server. We are thinking of using a scalable DB server e.g. FathomDB (which is just based on amazon RDS & rackspace) so that we can handle load increases easily.
The question is how does our android app write to these remote DBs? Do they have some kind of rest API, or allow you to have a php script similar to the one we have in place at the moment?
I'd say most of services like these have a connector running on the web, like the one you are using. But some of the services you mention (for example amazon rds) have a native mysql connection. So you can connect using mysql to the server and run queries like you currently do in php. You can use ACL to ensure security in your application :)