查询未更新值

Question

def modify(self):
    if self.CASE_NAME.get() and self.Buying_Price.get() and self. \
            Selling_Price.get() and self.price_piece.get() is not None:
        print('none is none')
        try:
            c.execute("SELECT * FROM Cases WHERE CaseName = '%s'" % str(self.CASE_NAME.get()))
            arr = c.fetchone()
            print(arr)
            if arr is not None:
                c.execute("UPDATE Cases SET BuyingPrice = %s , SellingPrice = %s WHERE CaseName = %s",
                          (int(self.Buying_Price.get())), int(self.Selling_Price.get()), str(self.CASE_NAME.get()))
                c.execute('Update Cases set PiecePrice = %s',(int(self.price_piece.get()),str(self.CASE_NAME.get())))
                conn.commit()
                print('updated succesfully!!')
        except:
            print("item couldn't be found")
    else:

出现以下错误

none is none

(26, 'Soda', 0, '500ml', 1000, 1020, 50, 0)

item couldn't be found

            ms.showwarning('Empy Fields','Make sure all fields are entered')

Answer 1

def modify(self):
    if self.CASE_NAME.get() and self.Buying_Price.get() and self. \
            Selling_Price.get() and self.price_piece.get() is not None:
        print('none is none')
        try:
            c.execute("SELECT * FROM Cases WHERE CaseName = '%s'" % str(self.CASE_NAME.get()))
            arr = c.fetchone()
            print(arr)
            if arr is not None:
                print('executing')
                c.execute(
                    "UPDATE Cases SET BuyingPrice = %s , SellingPrice = %s , PiecePrice = %s WHERE CaseName = %s",
                          (int(self.Buying_Price.get()), int(self.Selling_Price.get()),
                    int(self.price_piece.get()), str(self.CASE_NAME.get())))
                conn.commit()
                print('updated succesfully!!')

此代码非常有效，谢谢大家！