python的数据库链接

https://blog.csdn.net/canofy/article/details/83294330
#-*-coding:utf-8-*-
import MySQLdb

#yum update python  linux下更新python的命令

#获取数据库连接
def getConn():
 host="192.168.0.237"
 username="root"
 pwd="root"
 database="cn_ad_issue"
 return MySQLdb.connect(host=host,user=username,passwd=pwd,db=database)


#根据sql查询数据库，获取的数据是tuple类型 
def getBySql(sql): 
 conn=getConn()
 cursor=conn.cursor()
 cursor.execute(sql)
 result=cursor.fetchall()
 cursor.close()
 conn.close()
 return result

#执行一条sql语句，可以上update,delete以及insert
#"insert into t_userinfo(login_name,password,status,role,role_name,note) values(%s,%s,%s,%s,%s,%s)"
#param=(("bbb","bbb","a",1,"aaa","bbb"),("bbb","bbb","a",1,"aaa","bbb"))
#"update t_userinfo set login_name='ddd' where login_name='bbb'"
#"delete from t_userinfo where login_name='ddd'"
def execute(sql):
 conn=getConn()
 cursor=conn.cursor()
 n=cursor.execute(sql) 
# n=cursor.executemany(sql,param)
 cursor.close()
 conn.close()
 return n

#每个值的集合为一个tuple,整个参数集组成一个tuple,或者list
#使用executemany方法来批量的插入数据
#批量添加, param为tuple类型，如： param=(("bbb","bbb","a",1,"aaa","bbb"),("bbb","bbb","a",1,"aaa","bbb"))
#返回添加的条数
def insertBatch(sql,param):
 conn=getConn()
 cursor=conn.cursor() 
 n=cursor.executemany(sql,param)
 cursor.close()
 conn.close()
 return n


#sql="delete from t_userinfo where login_name='ddd'"
#param=(("t",),("z",))
#n=cursor.executemany(sql,param)
#print insertBatch(sql,param)
#execute(sql)

li=[]
subli=[]
tuple1=getBySql("select * from t_userinfo")
#li.append(tuple1) # append方法只把tuple作为一个整体添加到list中
li.extend(tuple1) # extend方法会把tuple（元组）转换成list（列表） 
count=len(tuple1)
#for subtuple1 in tuple1:
# li.extend(subtuple1);//每一个数据都成为了list中的一项
# print subtuple1;
# subcount=len(subtuple1)
# for key in subtuple1:
# print key
# print 'Wn'

print li
for iter in li:
 print iter;