如何通过循环中的 SQL 语句传递变量？ - Python

Question

conn=pyodbc.connect('Driver={SQL Server};'
'Server=test123;'
'Trusted_Connection=yes;')

data = []
date_x = ["202101","202010","202007"]
business_y = ["sales","marketing","tech"]
      
for i in date_x, business_y:
    sql_query = """ 
     Select name, period, business, purchase_date
     From test_table 
     Where period = ? #(date_x)
     AND business = ? #(business_y)
     """
     conn.execute(sql_query)
     data.append(pd.read_sql(sql_query, conn))

print(data)

我正在尝试通过循环运行此 SQL 语句，并且每次迭代我都想填充占位符“？” 使用上面示例中所示的正确变量并执行查询，将结果写入变量数据

Answer 1

这应该可行，假设 date_x 和 business_y 的长度总是相同的

data = pd.DataFrame()
date_x = ["202101","202010","202007"]
business_y = ["sales","marketing","tech"]
counter = 0
      
for i in date_x:
    sql_query = """ 
     Select name, period, business, purchase_date
     From test_table 
     Where period = {}
     AND business = {}
     """.format(date_x[counter], business_y[counter])
    counter +=1
    #print(sql_query)
    
    conn.execute(sql_query)
    data = data.append(pd.read_sql(sql_query, conn))

结果：

  Select name, period, business, purchase_date
 From test_table 
 Where period = 202101
 AND business = sales
 

 Select name, period, business, purchase_date
 From test_table 
 Where period = 202010
 AND business = marketing
 

 Select name, period, business, purchase_date
 From test_table 
 Where period = 202007
 AND business = tech

更新以显示如何执行并将结果存储到 DF