Use existing database - Android Development

Question

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How to access an existing sqlite database in Android?

I've been searching for a long time but I can't find the answer. I want to copy my existing Sqlite database test.db with data in it in my application. So when the users download my app from the application the db is delivered with it.

Now I'v seen a lot of references to the tutorials this and this. But none of them work for me.

    public class DatabaseAdapter extends SQLiteOpenHelper {
         private static String dbPath= "data/data/test.test.test/databases/"; 
         private static String dbName = "test"; 
         private SQLiteDatabase applicationDatabase;  
         private final Context applicationContext;


         public DatabaseAdapter(Context context) {    
                 super(context,  dbName , null, 3);
                 this. applicationContext  = context;
         }


         public boolean checkDataBase(){  
                 File dbFile = new File( dbPath +  dbName);  
   return dbFile.exists();
   }


          public void copyDataBase() throws IOException{  
   try {

                    InputStream input =  applicationContext .getAssets().open(dbName);
                           String outPutFileName=  dbPath  +  dbName ;
                      OutputStream output = new FileOutputStream( outPutFileName); 
                       byte[] buffer = new byte[1024];
                    int length;
                    while ((length = input.read(buffer))>0){
                    output.write(buffer, 0, length);
                    }
                    output.flush();
                    output.close();
                    input.close();
         }
                       catch (IOException e) {
                     Log.v("error",e.toString());
                    }
     }


             public void openDataBase() throws SQLException{
                 String fullDbPath= dbPath + dbName;
               applicationDatabase = SQLiteDatabase.openDatabase( fullDbPath,     null,SQLiteDatabase.OPEN_READONLY);
     }

                @Override
  public synchronized void close() {
          if( applicationDatabase != null)
            applicationDatabase .close();
               super.close();
  }
@Override
public void onCreate(SQLiteDatabase arg0) {
    // TODO Auto-generated method stub

}


@Override
public void onUpgrade(SQLiteDatabase arg0, int arg1, int arg2) {
    // TODO Auto-generated method stub

}

public void getit(){
    this.getReadableDatabase().rawQuery("SELECT * FROM test", null);
}






}

I get the error code = 1 no such table. If I check the database is created but only with the table android_metadata.

Someone a working example?

Answer 1

EDIT - Here is my code that works. I added what info you posted, but there may be other variables you didn't, so you may have to modify it a bit.

public class DatabaseAdapter extends SQLiteOpenHelper {

    private Context mycontext;

    private String DB_PATH = "data/data/test.test.test/databases/";
    private static String DB_NAME = "test";
    // the extension may be .sqlite
    // or .db
    public SQLiteDatabase myDataBase;

    public DatabaseAdapter(Context context) {
        super(context, DB_NAME, null, 1);
        this.mycontext = context;
        boolean dbexist = checkdatabase();
        if (dbexist) {
        } else {
            System.out.println("Database doesn't exist");
            try {
                createdatabase();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }

    }

    public void createdatabase() throws IOException {
        boolean dbexist = checkdatabase();
        if (dbexist) {
        } else {
            this.getReadableDatabase();
            try {
                copydatabase();
            } catch (IOException e) {
                throw new Error("Error copying database");
            }
        }
    }

    private boolean checkdatabase() {
        boolean checkdb = false;
        try {
            String myPath = DB_PATH + DB_NAME;
            File dbfile = new File(myPath);
            checkdb = dbfile.exists();
        } catch (SQLiteException e) {
            System.out.println("Database doesn't exist");
        }

        return checkdb;
    }

    private void copydatabase() throws IOException {

        // Open your local db as the input stream
        InputStream myinput = mycontext.getAssets().open(DB_NAME);

        // Path to the just created empty db
        @SuppressWarnings("unused")
        String outfilename = DB_PATH + DB_NAME;

        // Open the empty db as the output stream
        OutputStream myoutput = new FileOutputStream(
                "data/data/test.test.test/databases/test");

        // transfer byte to inputfile to outputfile
        byte[] buffer = new byte[1024];
        int length;
        while ((length = myinput.read(buffer)) > 0) {
            myoutput.write(buffer, 0, length);
        }

        // Close the streams
        myoutput.flush();
        myoutput.close();
        myinput.close();

    }

    public void open() {
        // Open the database
        String mypath = DB_PATH + DB_NAME;
        myDataBase = SQLiteDatabase.openDatabase(mypath, null,
                SQLiteDatabase.OPEN_READWRITE);

    }

    public synchronized void close() {
        myDataBase.close();
        super.close();
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        // TODO Auto-generated method stub

    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        // TODO Auto-generated method stub

    }
}

Answer 2

Do you have an "_id" column in each table?