Key points:

• The delete helper method of a database object is asynchronous, as with every database task.
• In the delete method, use the where and whereArgs named parameters to filter the data you want to delete.

Solution:

In the DbHelper class of the dbhelper.dart file, add a deleteItem method, as follows:

  Future<int> deleteItem(ListItem item) async {
      int result = await db.delete("items", where: "id = ?", whereArgs: 
      [item.id]);
      return result;
    }

Let's add a Dismissible widget to the items screen, next.