Question

I have an question.

I have only one table in my database

@Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL( "CREATE TABLE books (_id INTEGER PRIMARY KEY AUTOINCREMENT,title TEXT, author TEXT,isbn TEXT,city TEXT);");
        Log.v("onCreate-------","called onCreate"); 

    }

here:-

sqlite> select * from books;

also working fine.

but i want to add new table so i am trying to add here :-

@Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        android.util.Log.w("books",
        "Upgrading database, which will destroy all old data");

        //db.execSQL("ALTER TABLE myallbooks ADD COLUMN city2");
        db.execSQL("CREATE TABLE myfields (author TEXT,isbn TEXT,city TEXT);");



        Log.v("onUpgrade-------","called onUpgrade with alter"); 
    }

after changing the version number i run the app but i did not found the table any where.

sqlite> select * from myfields;

Error:-no such table :myfield.………………why it is not creating

Answer 1

@Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL( "CREATE TABLE books (_id INTEGER PRIMARY KEY AUTOINCREMENT,title TEXT, author TEXT,isbn TEXT,city TEXT);");
        Log.v("onCreate-------","called onCreate"); 

   db.execSQL("CREATE TABLE myfields (author TEXT,isbn TEXT,city TEXT);");

    }

@Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        android.util.Log.w("books",
        "Upgrading database, which will destroy all old data");

        //db.execSQL("ALTER TABLE myallbooks ADD COLUMN city2");
       // db.execSQL("CREATE TABLE myfields (author TEXT,isbn TEXT,city TEXT);");

          //delete tables
                db.execSQL("DROP TABLE IF EXISTS books");
          // Create tables again`enter code here`
        onCreate(db);

        Log.v("onUpgrade-------","called onUpgrade with alter"); 
    }