Question

Android 2.3.3

static String name = "Database";
static int version = 1;

static SQLiteDatabase sqlDB;
static Cursor c;


public Database(Context context) {
    super(context, name, null, version);
    // TODO Auto-generated constructor stub

    sqlDB = getWritableDatabase();

    }

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


    sqlDB.execSQL("create table if not exists Operations(Command Text, Pos1 Text, " +
                "Pos2 Text, Pos3 Text, Pos4 Text, Pos5 Text, Pos6 Text, Pos7 Text, Pos8 Text, Pos9 Text, Pos10 Text)");

        insertData();
    }

private void insertData() {
        // TODO Auto-generated method stub

        String addQuery ="ADD, add, and, had, ad, anddd, anndd, null, null, null, null";

                sqlDB.execSQL("insert into Operations values("+ addQuery +")"); 
                     //Exception at the above line
}

There are a total of 11 columns.

Can i insert NULL into the database?
If yes, is there any problem with the way i am trying to insert the data into the database?

As pointed out by rekire, it seems the problem is with the getWritableDatabase(). I am calling the constructor with , Database db = new Database(this); which worked in all other projects till now, as i have declared the local variables for name and version and provided null to the factory.

Answer ::: Sorry it’s my mistake. I called a method in the database,
by using Database.method(), instead of it’s object(db). This made the
SQLiteDatabase and Cursor objects to be static in the Database.java
file. When i changed it to db.method(), and removed the static
keyword, it works fine.

Thanks for your time.. And sorry for the trouble.

Answer 1

If I guess right than your function getWritableDatabase() returns null.