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Home/ Questions/Q 6758331
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Editorial Team
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Editorial Team
Asked: May 26, 20262026-05-26T13:46:24+00:00 2026-05-26T13:46:24+00:00

I am making an android app in which I need to make different tables

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I am making an android app in which I need to make different tables in same database in android Will I have to make different database helper classes for that?
Thanks

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  1. Editorial Team
    Editorial Team
    2026-05-26T13:46:24+00:00Added an answer on May 26, 2026 at 1:46 pm

    you have already a Sqlite database and you want to copy that database in assets so code is here :

    public class DataBaseHelper extends SQLiteOpenHelper{
    private Context mycontext;
    
    private String DB_PATH = "/data/data/com.example.android.podemo/databases/";
    private static String DB_NAME = "UrClassname.sqlite";
    public SQLiteDatabase myDataBase;
    
    
    public DataBaseHelper(Context context) throws IOException  {
        super(context,DB_NAME,null,1);
        this.mycontext=context;
        boolean dbexist = checkdatabase();
        if(dbexist)
        {
            System.out.println("Database exists");
            opendatabase(); 
        }
        else
        {
            System.out.println("Database doesn't exist");
        createdatabase();
        }
    
    }
    
    public void createdatabase() throws IOException{
        boolean dbexist = checkdatabase();
        if(dbexist)
        {
            System.out.println(" Database exists.");
        }
        else{
            this.getReadableDatabase();
        try{
                copydatabase();
            }
            catch(IOException e){
                throw new Error("Error copying database");
            }
        }
    }
    private boolean checkdatabase() {
        //SQLiteDatabase checkdb = null;
        boolean checkdb = false;
        try{
            String myPath = DB_PATH + DB_NAME;
            File dbfile = new File(myPath);
            //checkdb = SQLiteDatabase.openDatabase(myPath,null,SQLiteDatabase.OPEN_READWRITE);
            checkdb = dbfile.exists();
        }
        catch(SQLiteException e){
            System.out.println("Database doesn't exist");
        }
    
        /*if(checkdb!=null){
            checkdb.close();
        }
        return checkdb!=null? true :false;*/
        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
        String outfilename = DB_PATH + DB_NAME;
    
        //Open the empty db as the output stream
        OutputStream myoutput = new FileOutputStream("/data/data/com.example.android.podemo/databases/PartyDetails.sqlite");
    
        // 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 opendatabase() throws SQLException
    {
        //Open the database
        String mypath = DB_PATH + DB_NAME;
        myDataBase = SQLiteDatabase.openDatabase(mypath, null, SQLiteDatabase.OPEN_READWRITE);
    
    }
    
    
    
    public synchronized void close(){
        if(myDataBase != null){
            myDataBase.close();
        }
        super.close();
    }
    
    @Override
    public void onCreate(SQLiteDatabase db) {
    }
    
    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
    }
    
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