Question

I am using this example to create the database in to amy android app.

But here it is not given that how to fetch the data from the database.

My fields are like:

_id

name

address

type

now i want to show the all available name from the database.

I know that i have to use Select query. but where i have to use it that i dont know. So please can anybudy help e for that.

Thanks.

Answer 1

Write your method in DataBaseHelper that will be like this

public ArrayList<User> getUsersList() {

        ArrayList<User> userList = null;
        Cursor cursor = null;

        try {

            String queryString = "SELECT _id , name, address, type FROM User";

            cursor =  myDataBase.rawQuery(queryString, null);

            if (cursor != null && cursor.moveToFirst()) {
                userList = new ArrayList<User>();
                do {
                    User nextUser = new User(cursor.getInt(0),
                            cursor.getString(1), cursor.getString(2) , cursor.getString(3));
                    userList.add(nextUser);
                } while (cursor.moveToNext());
            }
        } catch (Exception e) {
            e.printStackTrace();
            userList = null;
        } finally {
            if (cursor != null && !cursor.isClosed()) {
                cursor.deactivate();
                cursor.close();
                cursor = null;
            }
            if(myDataBase != null){
                myDataBase.close();
            }
        }
        return userList;
    }