try this,
public void updateQty(Integer qty,String bookId)
{
int originalQty = getQuantity(bookId);
int updateQty = originalQty - qty;
try{
SQLiteDatabase db = this.getWritableDatabase();
String rawQuery = "update " + BOOKS_TABLE + " set " + KEY_QTY + " = " + updateQty + " where " + KEY_BOOK_ID + " = '" + bookId + "';";
db.execSQL(rawQuery);
db.close();
Log.v("UpdateQty", "Qty updated");
}
catch(Exception ex)
{
ex.printStackTrace();
}
}
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solved How to update a SQLite database in android?