第四篇：python操作数据库时的传参问题

python在操作数据库执行sql的时候我们经常会遇到传参问题，以下是我总结的几种方法：

1、格式化字符串

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

2、使用字典传递

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

3、传递参数+参数名称：利用‘三引号’实现复杂SQL的换行，然后对参数进行拼接，如下样例中的time，根据自己的情况而定

def sql_func(time):    time = "‘" + time + "‘"    fail_sql=‘‘‘    SELECT substr(s_start_time,1,10)  "日期",count(*)  "失败数量"      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进行各种操作    y=cr.execute(fail_sql)    result = y.fetchall()    return result

参考文档：https://www.cnblogs.com/goodhacker/p/3257882.html

原文地址：https://www.cnblogs.com/apff/p/10061835.html