I know it is possible to access DataBase which in SDCARD by many apps in android.
but do not know the process to do that.
1- I created one test.db DB in sdcard eclipse .
2- My current app is using this DB.
3- I created one other app(which ll access this DB)
Please guide me How can i access test.db in my new app.
You can use the same database only if you created the running application database in custom content provider.
You cannot directly access the database from running application.
But if you create your running application database in Custom Content Provider then with the help of authorities you can directly access the database.
In this case you don't even need to copy that database.
Refer this link for custom content provider.
Related
Is it possible to update SQLite database of android app outside app?I mean can user modify database according to them where the database situates in default location?
The default location is in /data/data/your-package/databases which is only accessible from your application. No other application is able to access it.
However in some special cases like rooted device, debug mode etc , it is still possible to access the database file and change it.
You can access the DB using Content Provider if you want to access it programmatically. Or If you just want to browse the data then you can follow this post.
i have one application with SQLite database and then i create another application that can connect to the database that i created one, my question is, is it possible connect the existing database without copying the existing once ? if possible can any one give me a sample code to connect my existing database . the name of my database is "SEIS" and the Table is Proinfo .
By default, each app's files are private to the app.
You could tell Android that your two apps should get permission to access each other's files by setting the sharedUserId attribute for both and signing them with the same signature, but the 'official' way to give other apps access to your data is to create a content provider.
Yes it is possible through the use of content providers. According to the documentation:
A content provider manages access to a central repository of data. A provider is part of an Android application, which often provides its own UI for working with the data. However, content providers are primarily intended to be used by other applications, which access the provider using a provider client object.
I suggest you read the following articles:
http://developer.android.com/guide/topics/providers/content-providers.html
http://www.tutorialspoint.com/android/android_content_providers.htm
I am not quite getting the idea of sqlite database. I am developing a hybrid mobile app using Ionic Framework and backend with PHP.
I referrred to this article for using the sqlite https://blog.nraboy.com/2014/11/use-sqlite-instead-local-storage-ionic-framework/
I have a few questions now,
1) So, anybody can create a table,insert and do any kind of operations? Is'nt there any need of a security method to access the DB like mysql?
2) Is a separate instance of Sqlite created for each application? Coz if not,I can make a guess for a tablename created by any other application and delete it all together,isn't it? I just dont get it?
1) SQLite is a file database so if you have access to file you have access to database and can do anything with it. What is the purpose of restricting access to db when you can just delete whole file? SQLite db file should be created in app private storage so no one have access to it only your app.
2) the answear is above. just create file in right place and everything will be fine :)
1) So, anybody can create a table,insert and do any kind of operations? Is'nt there any need of a security method to access the DB like mysql?
By default, each app db will store in their private folder(data/data/your_package_name/database and only that app or system app can access to it.
But if you choose to store your db in sdcard, anybody can mess up your db if they know the path to db file and have right to access it.
Other case is if your device is root, other apps can access your db too.
2) Is a separate instance of Sqlite created for each application? Coz if not,I can make a guess for a tablename created by any other application and delete it all together,isn't it? I just dont get it?
Like above, each app can choose where to store their db file, so basically, they a separate instance.
You can also create multi db file for one app if you like.
I'm new to programing for android and i'm still learning. So I have a question about the location of the SQLite database. Is it stored in the same file system as the application ?
And also i'm not sure can the database be created before the app is installed(can it come with the app) or can the database only be created from inside the app ?
And what if i wanted my app to come with a database that already has tables and records which is local and not on a server. Would that be possible ?
SQLite is available on every Android device. Using an SQLite database in Android does not require any database setup or administration.
You only have to define the SQL statements for creating and updating the database. Afterwards the database is automatically managed for you by the Android platform.
Access to an SQLite database involves accessing the filesystem. This can be slow. Therefore it is recommended to perform database operations asynchronously, for example inside the AsyncTask class.
If your application creates a database, this database is by default saved in the directory DATA/data/APP_NAME/databases/FILENAME.
The parts of the above directory are constructed based on the following rules. DATA is the path which the Environment.getDataDirectory() method returns. APP_NAME is your application name. FILENAME is the name you specify in your application code for the database.
You can also follow this tutorial for further understanding.
http://www.androidhive.info/2011/11/android-sqlite-database-tutorial/
Database is created after the app installation or after the db changes. The db is stored in /data/data/your_package/databases/
Is it possible to check if a db is created in other app? I have to have a common db for two app. If one app is already created the db then the second one should use the first apps' db (I mean should not create new one). For this,Is there a way to check whether that particular common db is created or not? Please help me on this.
This is not as easy as you may think. Even If you would definetly know, that your other app has created the db already, there is still difficulty in querying it. As any Db belongs to the app which created it, only this app usually gets access to it.
Good news is that there is is a mechanism for that, called ContentProvider. With it you are able to share the db-infos between apps, but it takes some effort to implement this.
The database is stored under /data/data/your.applications.package/databases. Normally this location could only be access by the user the Android OS created for the app. No other user is able to access this location unless the device is rooted. Then any user can access any location on the phone and manipulate the data.
so you can check the whether the db is present in this location or not
you can directly check this Android Access Another App's Database
The best thing for you is to use the sdcard (or some other user accessible area, without root)
Look at this thread
I know it's unsecure, but it's the best thing for this kind of problem. One application (the first one installed) creates the db on sdcard. The other one, just check's if the file (db) allready exists and reads from the existing db.
You should use SQLiteOpenHelper to control versioning of your database as described in database tutorial.
Unfortunately SQLiteOpenHelper only works in local app-directory but you can tell it to use a different directory on sd-card as described in sqliteopenhelper-with-fully-qualified-db-path-name
Try the following code
DB_PATH = "/data/data/THE_PACKAGE_NAME/databases/";
DB_NAME="YOUR_DB_NAME";
File dbFile = new File(DB_PATH + DB_NAME);
if(dbFile.exists()){
/* YOUR CODE HERE*/
}
Do the above check in both of your application with the PACKAGE NAME before creating the db.
:)