第四篇：python操作數據庫時的傳參問題

python在操作數據庫執行sql的時候我們經常會遇到傳參問題，以下是我總結的幾種方法：

1、格式化字符串

city = 'beijing'
cur.execute(“SELECT * FROM %s WHERE city = %s”, city)

2、使用字典傳遞

sql = “INSERT INTO user VALUES(%(username)s, %(password)s, %(email)s)”
value = {“username”:zhangsan,“password”:123456,“email”:[e-mail]}
cur.execute(sql, value)

3、傳遞參數+參數名稱：利用‘三引號’實現復雜SQL的換行，然后對參數進行拼接，如下樣例中的time，根據自己的情況而定

def sql_func(time):
    time = "'" + time + "'"
    fail_sql='''
    SELECT substr(s_start_time,1,10)  "日期",count(*)  "失敗數量"
      FROM T_SG_WS_EXE_LOG L
     WHERE 1 = 1
       AND (S_WS_METHOD = 'NotifyOrderStatus' OR (S_WS_METHOD = 'placeOrder' AND S_IS_OK = 'false'))
    and s_request_str not like  '%"deployStatus":"2120"%' and s_request_str not like  '%"deployStatus":"0"%'
    and  substr(s_start_time,1,10) = '''+time +'''group by substr(s_start_time,1,10) 
    '''
    # 使用cursor進行各種操作
    y=cr.execute(fail_sql)
    result = y.fetchall()
    return result

參考文檔：https://www.cnblogs.com/goodhacker/p/3257882.html