Question

I am creating my SQLite database for my App at runtime if it does not exist and insert rows if it does. Since it is supposed to be created at runtime and I have implemented it by creating a subclass of SQLiteOpenHelper and overriding the onCreate() method –

“Do I need to put anything in the /assets folder of my project?”

I am not using any Content Provider “Do I need to add any tags in the AndroidManifest.xml?”

Here is what I have done. The strings have been defined properly and I do not get any runtime exceptions.

Implementation of the SQLiteOpenHelper subclass.

public class MyDB extends SQLiteOpenHelper {

                   public MyDB(Context context) {
                    super(context, DATABASE_NAME, null,  DATABASE_VERSION );
                   }

                @Override
                public void onCreate(SQLiteDatabase db) {
                db.execSQL(USERAUTH_TABLE_CREATE);
                db.execSQL(USERPREF_TABLE_CREATE); 
                }

                @Override
                public void onUpgrade(SQLiteDatabase db, int oldVersion, int 
                newVersion) {
                    Log.w("Example", "Upgrading database, this will drop tables and
                    recreate.");
                    db.execSQL("DROP TABLE IF EXISTS " +  USERAUTH_TABLE_NAME);
                    db.execSQL("DROP TABLE IF EXISTS " +  USERPREF_TABLE_NAME);
                    onCreate(db);
               }

}

Here is where I create an instance of the MyDB subclass of the SQLiteOpenHelper.

MyDB tdb = new MyDB(Activity.this); 
SQLiteDatabase db = tdb.getReadableDatabase();

Everything runs and when I go to the sqlite shell and write the following query

select * from table_name – it just tells me no such record exist. I set breakpoints and it seems after the getReadableDatabase() is called the @Override OnCreate() method is never executed which is where I execute the Create table SQLs. I have tried getWritableDatabase()
as well.

I dont understand why the tables are not being created. If anyone can help that would be awesome.

Thanks.

Query Text String#1

private static final String USERAUTH_TABLE_CREATE =
“CREATE TABLE ” + USERAUTH_TABLE_NAME + ” (” +
“number INTEGER NOT NULL,” +
“dip TEXT NOT NULL,” +
“email TEXT NOT NULL,” +
“password TEXT NOT NULL,” +
“flag INTEGER” + “);” ;

Query Text String #2

private static final String USERPREF_TABLE_CREATE = 
 "CREATE TABLE " + USERPREF_TABLE_NAME + " (" +
 "tpd TEXT NOT NULL ," +
 "cat TEXT NOT NULL" + ");";

Answer 1

If onCreate() is not being called, then the database has already been created for your app. The quickest way to solve it is to delete your project on the emulator (Settings –> Applications –> Your application), and then restart your application. Alternatively you could use ADB to just drop your database — it’s up to you. Restarting the app after dropping the database will call onCreate() because the database does not exist, and then your table creation sql will be run. onCreate() is only called if your database DOES NOT exist (so pretty much the first time you call the database in your code.