Creating tables in sqlite database on android

Question

@Override
        public void onCreate(SQLiteDatabase db)
        {
            try{
                db.execSQL(\"create table \" +          NotificationManager.getUserSt         


        

Answer 1

            public class DBHandler extends SQLiteOpenHelper {
                private static String DATABASE_NAME = "mydb";
                private static int DATABASE_VERSION = 1;

                String TABLE_NAME = "Student";

                String KEY_ID = "id";
                String KEY_STUDENT_NAME = "name";
                String KEY_STUDENT_MARKS = "marks";

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

        @Override
            public void onCreate(SQLiteDatabase db) {
                // creating table
                String query = "CREATE TABLE " + TABLE_NAME +
                        " ( " +
                        KEY_ID + " INTEGER PRIMARY KEY," +
                        KEY_STUDENT_NAME + " TEXT," +
                        KEY_STUDENT_MARKS + " INTEGER"
                        " ) ";
                db.execSQL(query);

            // insertion in the table
            ContentValues values = new ContentValues();
            values.put(KEY_QUESTION_ID, "1");
            values.put(KEY_STUDENT_NAME , "abc");
            values.put(KEY_STUDENT_MARKS , "95");
            db.insert(TABLE_NAME, null, values);

            values.put(KEY_QUESTION_ID, "2");
            values.put(KEY_STUDENT_NAME , "def");
            values.put(KEY_STUDENT_MARKS , "93");
            db.insert(TABLE_NAME, null, values);
    }
        @Override
        public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
            // TODO Auto-generated method stub

            db.execSQL("DROP TABLE IF EXISTS " + TABLE_NAME);
            // Create tables again
            onCreate(db);
        }
     // retrieve date
     List getAllData(int Id) {

            List student = new ArrayList();
            // Select All Query
            String selectQuery = "SELECT * FROM " + TABLE_NAME + "    WHERE KEY_ID =" + "'" + Id + "'";

            SQLiteDatabase db = this.getWritableDatabase();

            Cursor cursor = db.rawQuery(selectQuery, null);

            // looping through all rows and adding to list
            if (cursor.moveToFirst()) {
                do {
                    Student std = new Student();
                    u.setId(cursor.getInt(0));
                    u.setStudentName(cursor.getString(1));
                    u.setMarks(cursor.getString(2));

                    student.add(std);
                } while (cursor.moveToNext());
            }
            // return student list
            return student;
        }
    }

     public class Student {

        public static int Id;
        public static String studentName;
        public static int marks;

        public int getId() {
            return Id;
        }

        public static void setId(int id) {
            Id = id;
        }

        public String getStudentName() {
            return studentName;
        }

        public static void setStudentName(String studentName) {
            Student.studentName = studentName;
        }

        public int getMarks() {
            return marks;
        }

        public static void setMarks(int marks) {
            Student.marks = marks;
        }
    }

    public class MainActivity extends AppCompatActivity {

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);

            DBHandler db = new DBHandler(getApplicationContext());
            List std = new ArrayList();
            rl = db.getAllData(1);
           for (Student s : std) {
               Log.v("Id",s.getId());
               Log.v("Name",s.getStudentName());
               Log.v("Marks",s.getMarks());
       }
    }
}