Since I am new to web application developments, please bear for my silly question.
I am having a scenario wherein the web application want to have a SQLite database inside it.
Also need to access the database with the help of an servlet class/ajax request
I am not sure, its possible or not. please advise me
Is it possible to have a sqlite database inside a application
Id Yes,is it possible to access the same via servlet/ajax request
If yes, is the database will be locally available at client side or not.
Please help me ....!! thanks in advance
yes
access the DB via servlet = bad practice; access it via your java code
the DB is local to the server side not the client, it is not something like HTML5 webstorage
Related
I need to update and insert rows in Sqlite from another app. I am working on an android app and I have to update database of another app,how can I do that,is it possible to access and edit another app's database from my app.
You should look at Content Providers. From the android official docs
Content providers manage access to a structured set of data. They encapsulate the data, and provide mechanisms for defining data security. Content providers are the standard interface that connects data in one process with code running in another process.
Android Docs explain how you can use it.
I understand what you are trying to achieve. correct me if i am wrong. You are developing android application in which you are trying to update your application database by fetching data from some different database. right? if yes, you have to get details of the database server /database connection details from the database owner if possible. in case if the owner of the database is not providing or not ready to give you credentials/database connection details then confirm whether they have any services/webAPI/web services through which they expose database data.
If they have webapi/webservices available then you can easily consume in your andriod application and do what ever operation you want to perform.
Hope this helps..
Hello i want to acess data from my mysql server
in javascript. But i have no clue how to do so.
I am running tomcat so it is not handy to use php.
Can someone please help me !
I thought maybe there is some way to get the variables
from my servlet, but it seems not possible to get
javascript connected to java or is there ?
var blueDates = magic way to get data from my mysql server;
Greetings,
Rick
You have to implement a servlet that returns the data from mysql. A good way to do so is to implemente a servlet that returns a JSON object containing the mysql data.
Once this is done use AJAX to ask the servlet for the data.
There is a lot of information about implementing this. After all this is a minimal REST implementation for a GET request. Just ask Stackoverflow or Google.
I'm looking for a way to open a JDBC connection without specifying my database login and password in plain text, as the application will be distributed and any Java decompiler would reveal them, allowing the users to access the database easily.
Is there any way to encrypt them, or store them somewhere else?
Looks like you want to let Android application talk to your database directly? Don't do that. It's a major security flaw. No matter how you encrypt your credential, you have to reveal your plain text somewhere during the execution of the program, and anyone with a debugger can see that. The correct way is to have use an API on your web service and call that API from client. All database transaction should happen in a trusted intranet.
Why would you want to do this? Generally the business side of your application would have this info and connect to MySQL. There, a user does not have access to any code. Then you create an endpoint that actually is accessible to the public. There you can worry about passing username and password stuff to the business logic, which again, actually has direct access to your database.
Basically, do not open a jdbc connection anywhere but your server side. Its a security measure.
I'm trying to develop an android app which needs to fetch information from a servlet hosted in my Java EE application server.
To access this servlet, I need to be first authenticated with the Application server. I searched the web to get information on how exactly this works. During authentication how dows the android app store the cookie, and then how does it transfers the cookie to the server for every request?
I got some bits and pieces of information about HttpClient. I'm not sure if this is the correct one which I should be using. It will be a great help if someone could guide me. If there are any documents available please share with me.
Maybe the HttpUrlConnection documentation page is what you are looking for?
I am assuming this is native app, if so, first you need to authenticate and get the cookie. It would be your responsibility to store the cookie some where and pass it in sussequent http calls. If it is not native, I am not sure how it works.
I'm in the process of designing an Android application right now.
I understand SQLite works on the phone device within the file structure. However I'm not sure if it's practical for our use.
If I'm wanting to store data that's available to all users (i.e. if someone updates their profile, it can be seen by all other users), can that be done using SQLite somehow? Or must we use a client-server model such as MySQL?
Is it practical to store user-specific information using SQLite and public information using MySQL?
Thank you
What you want to do is a Client-Server Architecture, store the data in your central server and get a copy of the working data on the phone. MySQL and SQLite don't share everything but it's close. Read the documentation on SQLite and you will see.
SQLite can't serve files like MySQL if that's your question via the network. You'll have to write that on your own. I suggest making a webservice.
If you want info to be available to all users you need a client-server model such as MySQL.
If you use SQL Lite, the only possible way to update that info without requesting it from a server is to make an Update on the application (not doable).
Don't forget that you'll require internet ON for these types of applications.
you mean all users going to use a single phone, probably not, the reason for recommending sqlite database for android is that its the lightweight, non memory eater and thus best suitable to mobile phones. Sqlite database can be used in phone while at server side we can use any. The only thing is use a method like sending xml request to server from phone, where server will send respond as xml or json, while the phone parse the xml and use the data in it. this is how online apps works in mobile phones..... ya ofcourse use mysql at server side and do the communication using as request - response yes the client-server.
Is it practical to store user-specific information using SQL Lite and public information using MySQL?
Yes, This is exactly what I'm doing with my app. It's a very common practice. I am storing information in a MySql db stored on a server that all users can read from. They can pull specific information to the device. From there I have a class in the app that stores information that they've selected within a SQLite db. You'll easily be able to add information to the MySql db on the server that all users can view.
yeah i think the model you are proposing should have no problem. Even i'm using a model something similar to what you are saying. I store some information on local sqlite db and majority of information in mysql db. For sending data from android device to mysql db you will have to write a mysql scipt on a page and android device will hit that page with the help of http request. You can send your data in that http request