第四篇：python操做數據庫時的傳參問題

python在操做數據庫執行sql的時候咱們常常會遇到傳參問題，如下是我總結的幾種方法：

一、格式化字符串

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

二、使用字典傳遞

sql = 「INSERT INTO user VALUES(%(username)s, %(password)s, %(email)s)」
value = {「username」:zhangsan,「password」:123456,「email」:123456@ouvps.com}
cur.execute(sql, value)

三、傳遞參數+參數名稱：利用‘三引號’實現複雜SQL的換行，而後對參數進行拼接，以下樣例中的time，根據本身的狀況而定

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進行各類操做    y=cr.execute(fail_sql)    result = y.fetchall()    return result參考文檔：https://www.cnblogs.com/goodhacker/p/3257882.html