小编ced*_*d73的帖子

我正在使用 pyodbc 从 MSQL Server 获取一些数据。工作正常，除非检索大量数据：它真的很慢。

我有大约 4000 行，这不是一个很大的数字。

conn = pyodbc.connect('DRIVER={SQL Server};SERVER=192.168.1.10;DATABASE=MyDB;Trusted_Connection=yes;')
cur = conn.cursor()
cur.execute('SELECT * FROM myTable')

我尝试了以下方法：

time1 = datetime.datetime.now()
a = cur.fetchall()
time2 = datetime.datetime.now()
print time2 - time1
print len(a)

0:00:27.286000

time1 = datetime.datetime.now()
for i in range(0, 4017):
    cur.fetchone()
time2 = datetime.datetime.now()
print time2 - time1

0:00:21.196000

time1 = datetime.datetime.now()
allIDRows = list(cur.fetchmany(4017))
time2 = datetime.datetime.now()
print time2 - time1

0:00:23.845000

time1 = datetime.datetime.now()
a = cur.fetchmany(4017)
time2 = datetime.datetime.now()
print time2 - …