I am making an application similar to that of apps such as pay by phone and paymobile, which are apps used to pay for parking instead of using a parking meter and having to display a ticket in your vehicle.
I need to start with the back-end (the database) and was wondering if SQL would be appropriate for this app.
As SQLite is stored on the system (the Database) there will be data such parking details and payment details.
Will I be able to send this data to say my laptop which will act as the server for the traffic wardens device to check number plates?
Or would I have to use a sql software that is not on the applications itself?
Any thoughts and suggestions would be much appreciated :D
SQL is perfect for back end database needs. You can various flavors of SQL like Oracle or MySQL on the back end. As far as the application data being sent to the server (your backend laptop), that will be taken care by the application level programming. For android, there are various ways to send data, using the native class AsyncTask or using third party libraries like Retrofit and Volley. You need to take a decision depending on the architecture of your app.
Try this
Create database on your server
Create Web API like .Net MVC on your server
Create connection between your Web API and your database
In your mobile app you can use webservice to get our put your data to database
You can encyrpt your data on your database to more safety
do not use SQLite , because it is unsafe to keep your important data.
Related
I am planning to make a software which requires two or more databases to be in sync with a main server database ( located on a web server ). Suppose one user have installed my software on more than one computers. Suppose he updates some info on PC-1 then the change should be locally updated and if he is connected with the internet, it should get in sync with the main web server. When he opens the software on PC-2, latest into must be shown there ( assuming he is connected with the internet ).
Now suppose both PC-1 and PC-2 have same data, and both are offline. User deletes the data from PC-1 but don't deletes it from PC-2 ( he assumes it'll get managed automatically ), now when both of the systems go online, the record must be deleted from PC-2 too.
Basically, I am trying to find the database which was most recently updated or modified and sync it with the main database ( on the server ). How can I do it ?
It sounds like you want to synchronize some user data whenever the users or application becomes "online" again.
A couple of suitable services are:
Amazon Cognito Sync is an AWS service and client library that enables cross-device syncing of application-related user data. You can use it to synchronize user profile data across mobile devices and the web without requiring your own backend. The client libraries cache data locally so your app can read and write data regardless of device connectivity status. When the device is online, you can synchronize data, and if you set up push sync, notify other devices immediately that an update is available.
AWS AppSync enables developers to interact with their data by using a managed GraphQL service. GraphQL offers many benefits over traditional gateways, encourages declarative coding style, and works seamlessly with modern tools and frameworks, including React, React Native, iOS, and Android. GraphQL is a data language that was developed to enable apps to fetch data from servers. It has a declarative, self-documenting style. In a GraphQL operation, the client specifies how to structure the data when it is returned by the server. This makes it possible for the client to query only for the data it needs, in the format that it needs it in.
I am just a beginner in android app development and that's why I have many doubts. I am building one application where the user enters some data in editText. Now I want to save that data in my database. My database is running on my laptop. How would my app connect to the database? Do I need a web server in between? If yes then which web server is used for Android apps? Basically, i want to know the flow of data from app to the database.
Study more from Udacity.com, its free.
You may use a jdbc Connector to connect to database.
Connect your jdbc connector over local network ip\servername and database connection string
You can use REST Service when it comes to web Service on Android like this. You can either pass the values as parameters or an Object depending on your requirement. All the best
Wamp server is best option to play with server related utilities.You can use it even if you are offline. and it provides various option for data storage. It Mainly uses MySql and PHP scripts for fast performance.
For More details Click Here
I trying to post data from android SQLite database to MySQL database. I come cross many reference. My question is can I post data from Android SQLite database to MySQL database without Json? Json seem very complicated since I don't have a any Json knowledge.So far I can store data in SQLite. I need to post all my data to MySQL. Thank You.
It is a good question.let maximum people get benefit out of this. When you are using a mobile either it could android,IOS,windows no matter what ,the device has to interact with the server in order to exchange the data stored in the server.If you want to browse you need an active internet connection. can you browse without internet on a mobile?? i don't think that technology exist. Similarly, there are only two ways how you can interact with server from mobile devices. XML JSON Typically these act as a bridge between two canals.
XML:
The data can be transferred from mobile to server and from server to mobile using XML.This is the traditional one.May be first evolved technology.But it is heavy weighted.
JSON
This is the advanced technology. Very Light-weighted,quick and easy to learn.Easy to parse. JSON is the common framework that is being used now-a-days.
And when it comes to your question:
you cannot cross canals without a bridge or a boat. which is JSON or XML in your case.
I'm developing a game in Java and I need need store and get data from mysql database.
Currently I have login credentials saved in my Java app source codes and I'm using some library for the communication. But I think that this is a really unsecured way cause of credentials saved in the Java file.
I was wondering what if I do it through some server side PHP scripts which would just get some information and do what is necessary. But again somebody can get that link and do some evil.
I also thought about creating a new database and mysql user for each user registered. So there would be central database where would be just informations for game and it would be read only. So no security problems. And user informations would be saved in his own database and only he would have login for it. But I see one problem, what if I'll need get some information from another user?
So I was wondering what is the best way to keep it simple and secured?
Define a set of services (RESTful will be good) in server side (through PHP or Java or another programming language) that communicates with the datasource (MySQL or another). Then, from your client, consume these services. Now, you can assure the client and server points for communication like authentication and authorization to consume the services, you can use OAuth for this.
also thought about creating a new database and mysql user for each user registered. So there would be central database where would be just informations for game and it would be read only. So no security problems. And user informations would be saved in his own database and only he would have login for it
This is a no go. Since it's a game, you will have to maintain a single database per user. It's highly costly and you will have more problems than just retrieving the data from another user.
I am new to Java and Android. I am just beginning work on an app that will save information to a server that someone else from within the same company can retrieve using the same app from a different android device. I know how to simply store data on a server using simple php scripts but this is a bit more complex and involves one user writing information to the server, while another user can see / download it. Within a company there would be multiple users who have acceess to this data. So my question would be, whats the best way to implement a company-wide database that ONLY members of the same company can have access to? Sorry if this seems obvious to some of you. I am just getting started and I have 7 books on android programming and none of them describe how to do quite what I am trying to do.
To do this you need to use Android network services to access data. In other words to retrieve a networked database information your device will connect to your service with a specified URL and arguments. In turn, the service will reply with the required data, say may be in XML format. All your app needs to do is parse the XMl and display the date as desired.
Same thing applies to putting data into the server, in this case however the data will be sent as arguments to the network service URL and the service will handle the persistence to a database.
My advise is to do a Google search of the keyword "Android Network Services".