Android :: Creating Database For Application
Apr 18, 2010
I have started creating database for my application. It is working well. The data is also getting stored.But the issue is that i require dropping table, that already exists, every time i run the application.
But one thing i found is that whenever i change the version of the database in my code, the table gets dropped. But i would like to know whether it is possible to drop table without changing the version number of the database.
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May 23, 2009
I am new to android and I have a problem in creating a database.
public class database extends ListActivity {
/** Called when the activity is first created. */
private final String MY_DATABASE_NAME = "myCoolUserDB.db";
private final String MY_DATABASE_TABLE = "t_Users";
Context c;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
ArrayList<String> results = new ArrayList<String>();
setContentView(R.layout.main);
SQLiteDatabase mydb=null;
try
{
mydb.openOrCreateDatabase(MY_DATABASE_NAME, null);
} catch(Exception e){}
}}
When I run this code it throws a run time exception.
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Jun 14, 2010
I want to create a SQLite database in my app, which contains three tables, I will add data into tables and will use them later on.but I like to keep database ,as if when app is first time installed it checks whether the database exist or not, if exists it updates it else if not then creates a new database.further more I am making a DB class to facilitate my app,so I wont be creating an activity for my database creation.if there are possible advices, please share with me
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Dec 23, 2009
The database of my application need to be filled with a lot of data, so during onCreate(), it's not only some create table sql instructions, there is a lot of inserts. The solution I chose is to store all this instructions in a sql file located in res/raw and which
is loaded with Resources.openRawResource(id).
It works well but I face to encoding issue, I have some accentuated caharacters in the sql file which appears bad in my application. This
my code to do this : Code...
The solution I found to avoid this is to load the sql instructions from a huge static final string instead of a file, and all accentuated characters appears well.
But Isn't there a more elegant way to load sql instructions than a big static final String attribute with all sql instructions?
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Jun 6, 2011
Is there a way that I can use my own database when creating an app?
What I mean by that is that I want the app to start with a database already loaded so one doesn't have to be created when the app is started?
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Feb 22, 2010
How to create two or more tables in one database in single class which extends sqliteopenhelper in one function oncreate.
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Mar 27, 2014
i have a church database which i want to create an App which contains all details in the database....with a search button to search the database...
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Sep 20, 2010
I am creating an app which allows for many different Activities to be started from a TabActivity(up to ~25). Most of the activities require data from the sqlite database, so when onCreate is run, an AsyncTask creates an SQLiteOpenHelper object(which will open a readable/writable database), runs a query, data is retrieved, and everything is then closed.
I was just testing messing around to see if i could break something, so i added every Activityto the TabActivity's TabHost. I then started mashing each tab as quickly as possible.
I noticed that very quickly i began to see in the LogCat: Caused by: android.database.sqlite.SQLiteException: database is locked: BEGIN EXCLUSIVE; and the app proceeded to die.
Typically there will only be about 4-6 tabs(i can just limit the user anyway) for the TabHost. I haven't been able to break anything with a small amount of tabs to mash, but i am still worried that maybe i am accessing the database in a poor way.
How can i prevent my SQLiteDatabase objects to cause a lock?
If i create a ContentProvider will that eliminate the possibility of database locking?
Do you have any suggestions for changes I could make for accessing data from an SQLiteDatabase?
I ended up taking the approach of using the Application class and storing 1 SQLiteOpenHelper and trying my best to keep it synchronized. This seems to be working great - i put all my 25 activities in the TabHost and mashed away on them with no errors.
I am calling ((SQLiteDbApplication)getApplication()).setDbHelper(new DBHelper(this, Constants.DB_NAME, null, Constants.DB_VERSION_CODE)); method(shown below) in every onCreate() in my activities
Any further suggestions to this approach or to the changes i made using this Application class?
CODE:...................
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Jan 19, 2010
Is there something like a FileDialog available? From previous threads, it appears there isn't one.
If not, has someone written one?
I want to allow a user to
a) Specify a folder/filename on storage for creating an SQLite database.
b) Specify an existing file/folder on storage card for opening as an SQLite Database.
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Sep 16, 2010
Is it possible to install a java library in a folder and have this code dynamically linked into another program? In other words, i have a major code base that would be shared among different projects.Assume that all them are created with the same shared user id.
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Jun 20, 2010
I want to have an options menu that is available to all Activities in my app (on pressing the MENU button). I've been doing this by creating it in onCreateOptionsMenu(Menu menu) for each Activity but this seems redundant. Is there a way to create it in one place and have it available in all Activities?
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Nov 10, 2010
I'm developing an Android application that consists of:
a lightweight background service that logs events to a DB
a heavier GUI application that summarizes these events and displays graphs.
I'm having trouble creating the service part, though. The graphic application can use quite some RAM, and when it goes to the background, the OS closes it after some time of not being used.
The problem is, when the application gets shut down, so does the service. This is bad because this keeps me from recording further events. I don't care if the application gets terminated, but the service needs to keep on running.
I have tried numerous ways to keep the service alive, like having it use threads or a differently named process than the main app. Nothing has worked, and I have found no help on any of the android developer pages or forums.
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Apr 23, 2010
What is the recommended way of creating a demo version for an application. Basically, the demo version will be fully functional, but will be limited to running it 25 times. My worry is that if the user uninstalls and reinstalls, the count will be reset. I thought about writing a data file to the SD Card with the count of executions (hoping that would persist after uninstall), but I do not want to add that permission if I can avoid it. Any suggestions on how to have some type of demo flag persist after an uninstall?
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Apr 9, 2010
I implemented sqlitedatabase using content provider in one application. And created some tables and some data in that. By using another application how to read those database. I am doing in second application as a sql query by using Content uri what i used in application one. But it is throwing exception that read permissin is required. How to give those permissions is it in application1 or 2.
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Aug 4, 2010
I need to know how to create simple android application by sqlite database, how can i view the sqlite database and to view the tables has like other mysql server,Let me help to create simple application with database.where i can find the database.
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Feb 10, 2010
I want manage our web application using an android application. we want to the database connection object. we are using mysql database. and i want to post the data to my server. so please help me for this solution.
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Aug 30, 2010
android code to delete the database from the application?
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Feb 11, 2010
How to access my web application database in android emulator, i want list out my database values. These are in my web application. database name employees and table: employee_data. i want to get employee_data data on android emulator.
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Jan 31, 2010
I'm searching information about how i can access a specific database that to not belong to me, and that is store in /data/data/com.... directory is it possible without root access? it it possible with root access, and how?
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Apr 6, 2010
I am writing an app that will require a centralized database, along with a small app to digest incoming file data and populate this database.
android phone -> file -> some app somewhere -> some database somewhere
I know this is probably a fairly common situation. Is there a particular hosting service/solution for this? Many apps must do something like this (with high score tables and the like). The trick is, I can't use one of the high-score-specific hosting sites, because I need the app in front of the database to interpret the incoming files.
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Aug 13, 2010
One of my applications downloads a database from a server. When I install the application onto my phone, it downloads the file correctly and loads the information, no exceptions thrown or anything. However, when I upload the apk into the Android Market Place and download it onto the phone, the application downloads the database and then crashes, saying that the sqlite handler was not able to open up the database.
Here's the progression of code:.............
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Sep 16, 2010
I'm testing an application I'm working on and I wanted to delete the database my application creates so I could read all the data from my web server back in to a fresh one.
I launched adb, went to data/data/my.applicaton.package/databases and did a "rm mydatabase". This deleted the database (note: I've done this many many times before without a problem).
I launched my application again and, to my surprise, a new database wasn't created. Even more surprising is there was data in my application. My application is still pulling the data from some where! It gets a Cursor from my database and uses a CursorAdapter to populate the list. So, it is obviously reading from a database (seemingly a cached one?).
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Aug 24, 2010
I'm trying to implement a database in my application. I'm following a tutorial about writing my own ContentProvider, but I'm confused about SQLiteOpenHelper::getType. We're supposed to write it and, essentially, write a switch that returns the MIME type corresponding to the type of data we're dealing with.
I don't fully understand it. I'm not sure, even though I have an example, what is precisely supposed to be conveyed here. How do I determine the MIME type of my different tables of data?
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Nov 24, 2010
I got some problem with my database in my Android application. Perhaps, my application is working but let me explain you.
Here are just parts of the code from my app.. i don't want to paste the whole it's not needed.
CODE:....................
So when i try to run my app i get Force close, but when i put manually: dh.insert("test", "ooo");
In the onCreate method in my main activity everything is fine and working. So, the conclusion is that i must put some value for the first time i run the app so it can work properly. I thought maybe to update that row with the new informations that i insert later through some TextView's from the app.
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Nov 9, 2010
I am having a own device which is running on android 2.1.I have installed one application in that .That application will create a new DB if there is no DB for the application.It is creating correctly .I have accessed the device memory as well.I have seen the database in the device memory.But when I reboot the device the Database got erased .The app is not persisting the database after rebooting the device.What will the problem?
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Apr 16, 2013
im try to make apps about information of a city. On the picture has many menu (you can see menu "info 1", "info 2", "info 3"....). in the plan, i will make thats app with Android SQLite, so for each info menu can display an information from sqlite database (read data from SQLite database). The questions are :
how thats app posible to make ?
What the name type or app model (similiar to picture) and what must be learn, so i can know how to build that app ?
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Oct 27, 2010
In my application, I am going to create a few listviews that are dependent on the listview before it. For example,Then, depending on user choice, will go next screen, let's say, it contains a submenu of each type of school,that may be different or may be the same to other states.What I want to know, is how to populate these different lists dynamically as the user goes on? I don't know what the best of doing this is, and I seem to be looking in the all the wrong places because I keep getting stuck. Once all the data is added into whatever structure is used, it will be static. I basically just need help as to how to code information into some sort of hashtable or anything of the sort that can be easily referenced, and later when the Application is updated, be able to add more schools/states/submenus etc.
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Oct 11, 2010
I'm new to the android application development. I found some packages java.sql and javax.sql packages in the API of android while going through it. My doubt is can I access the Oracle Database directly using drivers. So what type of driver is used to connect.
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Oct 29, 2009
Basically I am creating a database driven website in Web Developer 2008. The database is stored in the App_Data folder of my website project. Could I have an iPhone, Blackberry, Symbian, Windows Phone, webOS or Android app access the database via an HTTP (or some other type of) request? I would like to know if this is possible before I move too far in the programming.
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Mar 20, 2009
what is the maximum size of application's database allowable in Android? In other words whats max capacity of android appl private database, as well as whats max capacity of content provider available?
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