有沒有辦法根據列表長度設置 SQL 查詢中的變量數？

Question

我正在嘗試根據用戶的選擇從數據庫中獲取每月值並將它們可視化。 我有復選框，如下所示；

我使用的復選框

為了根據用戶的選擇獲取每月銷售數字，我從復選框中獲取值並創建一個僅包含不等於零的值的新列表。 之后，我編寫了一個 Select 查詢，其中特定列具有列表中的任何值。 但是用戶只能選擇 1 個值或 3 個值或其他任何值，我的 sql 查詢必須根據它進行更改。 如果用戶選擇 1 個值，如果他們選擇 5 個值，我必須在查詢中只使用 1 個“%s”，我必須使用其中的 5 個。 所以我創建了一堆 if function 條件是列表的長度。 有沒有辦法根據列表的長度來安排 sql 查詢中的變量數量？

def plot(self):
        self.listo=[]
        for val in self.lili:
        
        # self.lili is a list that has all of the checkboxes value in it. Unchecked box values is 0 for all.Checked box values is changing based on month.
        
            val=val.get()
            if val !=0:# I created a empty list and add all the checked values in it.
                self.listo.append(val)   
            else:
                pass
        self.tryn=len(self.listo)# I get the lenght of checked checkboxes.
        
        if self.tryn==0:#If anything is selected it's an error.
            messagebox.showerror("Error", "You have to choose at least one")
        if self.tryn==1:##If 1 values is selected use this query with 1 variable.
        
            self.cursor.execute("SELECT SUM(current_sales) FROM targets WHERE nameofmonth=(%s)",(self.listo[0],))
            self.current_sales1=self.cursor.fetchall()[0][0]
            self.cursor.execute("SELECT SUM(target_sales) FROM targets WHERE nameofmonth=(%s)",(self.listo[0],))
            self.target_sales1=self.cursor.fetchall()[0][0]
            self.show_plot()
        if self.tryn==2:##If 2 values is selected use this query with 2 variable.
            query=("SELECT SUM(target_sales) FROM targets WHERE (nameofmonth=(%s) OR nameofmonth=(%s))")
            self.cursor.execute(query,self.listo)
            self.target_sales1=self.cursor.fetchall()[0][0]
            query2=("SELECT SUM(current_sales) FROM targets WHERE (nameofmonth=(%s) OR nameofmonth=(%s))")
            self.cursor.execute(query2,self.listo)
            self.current_sales1=self.cursor.fetchall()[0][0]
            self.show_plot()
        if self.tryn==3:
            query=("SELECT SUM(target_sales) FROM targets WHERE (nameofmonth=(%s) OR nameofmonth=(%s)) OR nameofmonth=(%s)")
            self.cursor.execute(query,self.listo)
            self.target_sales1=self.cursor.fetchall()[0][0]
            query2=("SELECT SUM(current_sales) FROM targets WHERE (nameofmonth=(%s) OR nameofmonth=(%s)) OR nameofmonth=(%s)")
            self.cursor.execute(query2,self.listo)
            self.current_sales1=self.cursor.fetchall()[0][0]
            self.show_plot()

Answer 1

我找到了一個更好的方法來做到這一點。 我創建了一個字符串並將其與包含選中復選框值的列表的長度相乘。

query="WHERE "+"nameofmonth=(%s) OR "*self.tryn 

為了擺脫最后的額外 OR 和空間；

query=query[:-3]

在和我剛剛使用這個變量格式化我的查詢。

您可以在此處查看完整的 function 和說明；

def plot(self):
            self.listo=[]
            for val in self.lili:
            
            # self.lili is a list that has all of the checkboxes value in it. Unchecked box values is 0 for all.Checked box values is changing based on month.
            
                val=val.get()
                if val !=0:# I created a empty list and add all the checked values in it.
                    self.listo.append(val)   
                else:
                    pass
            self.tryn=len(self.listo)# I get the lenght of checked checkboxes.
            
            query="WHERE "+"nameofmonth=(%s) OR "*self.tryn 
            #Creating a string variable for my query condition and multiplying it with lenght of the check box values.
            #For example if 3 boxes checked by user we get something like that "WHERE nameofmonth=(%s) OR nameofmonth=(%s) OR nameofmonth=(%s) OR "
            query=query[:-3]
            #Getting rid of the extra OR and space at the end. 
            query2="WHERE "+"nameofmonth=(%s) OR "*self.tryn
            #Couldnt use one query for 2 execute function so i just created another one and it worked xd
            query2=query2[:-3]
            
            query=("SELECT SUM(current_sales) FROM targets {}".format(query))
            #Using this query i get this output (for 3 checked checkboxes)
            #("SELECT SUM(current_sales) FROM targets WHERE nameofmonth=(%s) OR nameofmonth=(%s) OR nameofmonth=(%s))
            self.cursor.execute(query,self.listo)
            #Executing the query by using the list that has the values from checkboxes where values are not equal to zero.
            self.current_sales1=self.cursor.fetchall()[0][0]
            #Getting the SUM of the column i want in INT type.