python 多线程串行和并行的实例

如下所示：

#coding=utf-8
import threading
import time
import cx_Oracle
from pprint import pprint
import csv
table_name = "dbtest.csv"
f = open(table_name + ".csv", "w")

def exp01():
  conn = cx_Oracle.connect('test/test@192.168.137.2/serv')
  cursor = conn.cursor()
  owner = "system"
  writer = csv.writer(f, lineterminator="\n", quoting=csv.QUOTE_NONNUMERIC)
  tname = threading.current_thread()
  print tname
  exportOracleSql = "select 'exp01' from dual"
  print exportOracleSql
  x = cursor.execute(exportOracleSql)
  time.sleep(1000)
  cursor.close()
  conn.close()

def exp02():
  conn = cx_Oracle.connect('test/test@192.168.137.2/serv')
  cursor = conn.cursor()
  owner = "system"
  writer = csv.writer(f, lineterminator="\n", quoting=csv.QUOTE_NONNUMERIC)
  tname = threading.current_thread()
  print tname
  exportOracleSql = "select 'exp02' from dual"
  print exportOracleSql
  x = cursor.execute(exportOracleSql)
  time.sleep(1000)
  cursor.close()
  conn.close()


def exp03():
    conn = cx_Oracle.connect('test/test@192.168.137.2/serv')
    cursor = conn.cursor()
    owner = "system"
    writer = csv.writer(f, lineterminator="\n", quoting=csv.QUOTE_NONNUMERIC)
    tname = threading.current_thread()
    print tname
    exportOracleSql = "select 'exp03' from dual"
    print exportOracleSql
    x = cursor.execute(exportOracleSql)
    time.sleep(1000)
    cursor.close()
    conn.close()

def exp04():
    conn = cx_Oracle.connect('test/test@192.168.137.2/serv')
    cursor = conn.cursor()
    owner = "system"
    writer = csv.writer(f, lineterminator="\n", quoting=csv.QUOTE_NONNUMERIC)
    tname = threading.current_thread()
    print tname
    exportOracleSql = "select 'exp04' from dual"
    print exportOracleSql
    x = cursor.execute(exportOracleSql)
    time.sleep(1000)
    cursor.close()
    conn.close()

def exp05():
    conn = cx_Oracle.connect('test/test@192.168.137.2/serv')
    cursor = conn.cursor()
    owner = "system"
    writer = csv.writer(f, lineterminator="\n", quoting=csv.QUOTE_NONNUMERIC)
    tname = threading.current_thread()
    print tname
    exportOracleSql = "select 'exp05' from dual"
    print exportOracleSql
    x = cursor.execute(exportOracleSql)
    time.sleep(1000)
    cursor.close()
    conn.close()

def exp06():
    conn = cx_Oracle.connect('test/test@192.168.137.2/serv')
    cursor = conn.cursor()
    owner = "system"
    writer = csv.writer(f, lineterminator="\n", quoting=csv.QUOTE_NONNUMERIC)
    tname = threading.current_thread()
    print tname
    exportOracleSql = "select 'exp06' from dual"
    print exportOracleSql
    x = cursor.execute(exportOracleSql)
    time.sleep(1000)
    cursor.close()
    conn.close()

def exp07():
    conn = cx_Oracle.connect('test/test@192.168.137.2/serv')
    cursor = conn.cursor()
    owner = "system"
    writer = csv.writer(f, lineterminator="\n", quoting=csv.QUOTE_NONNUMERIC)
    tname = threading.current_thread()
    print tname
    exportOracleSql = "select 'exp07' from dual"
    print exportOracleSql
    x = cursor.execute(exportOracleSql)
    time.sleep(1000)
    cursor.close()
    conn.close()

def exp08():
    conn = cx_Oracle.connect('test/test@192.168.137.2/serv')
    cursor = conn.cursor()
    owner = "system"
    writer = csv.writer(f, lineterminator="\n", quoting=csv.QUOTE_NONNUMERIC)
    tname = threading.current_thread()
    print tname
    exportOracleSql = "select 'exp08' from dual"
    print exportOracleSql
    x = cursor.execute(exportOracleSql)
    time.sleep(1000)
    cursor.close()
    conn.close()

def exp09():
    conn = cx_Oracle.connect('test/test@192.168.137.2/serv')
    cursor = conn.cursor()
    owner = "system"
    writer = csv.writer(f, lineterminator="\n", quoting=csv.QUOTE_NONNUMERIC)
    tname = threading.current_thread()
    print tname
    exportOracleSql = "select 'exp09' from dual"
    print exportOracleSql
    x = cursor.execute(exportOracleSql)
    time.sleep(1000)
    cursor.close()
    conn.close()

def exp10():
    conn = cx_Oracle.connect('test/test@192.168.137.2/serv')
    cursor = conn.cursor()
    owner = "system"
    writer = csv.writer(f, lineterminator="\n", quoting=csv.QUOTE_NONNUMERIC)
    tname = threading.current_thread()
    print tname
    exportOracleSql = "select 'exp10' from dual"
    print exportOracleSql
    x = cursor.execute(exportOracleSql)
    time.sleep(1000)
    cursor.close()
    conn.close()

def exp11():
    conn = cx_Oracle.connect('test/test@192.168.137.2/serv')
    cursor = conn.cursor()
    owner = "system"
    writer = csv.writer(f, lineterminator="\n", quoting=csv.QUOTE_NONNUMERIC)
    tname = threading.current_thread()
    print tname
    exportOracleSql = "select 'exp11' from dual"
    print exportOracleSql
    x = cursor.execute(exportOracleSql)
    time.sleep(1000)
    cursor.close()
    conn.close()

def exp12():
    conn = cx_Oracle.connect('test/test@192.168.137.2/serv')
    cursor = conn.cursor()
    owner = "system"
    writer = csv.writer(f, lineterminator="\n", quoting=csv.QUOTE_NONNUMERIC)
    tname = threading.current_thread()
    print tname
    exportOracleSql = "select 'exp12' from dual"
    print exportOracleSql
    x = cursor.execute(exportOracleSql)
    time.sleep(1000)
    cursor.close()
    conn.close()

def exp13():
    conn = cx_Oracle.connect('test/test@192.168.137.2/serv')
    cursor = conn.cursor()
    owner = "system"
    writer = csv.writer(f, lineterminator="\n", quoting=csv.QUOTE_NONNUMERIC)
    tname = threading.current_thread()
    print tname
    exportOracleSql = "select 'exp13' from dual"
    print exportOracleSql
    x = cursor.execute(exportOracleSql)
    time.sleep(1000)
    cursor.close()
    conn.close()

def exp14():
    conn = cx_Oracle.connect('test/test@192.168.137.2/serv')
    cursor = conn.cursor()
    owner = "system"
    writer = csv.writer(f, lineterminator="\n", quoting=csv.QUOTE_NONNUMERIC)
    tname = threading.current_thread()
    print tname
    exportOracleSql = "select 'exp14' from dual"
    print exportOracleSql
    x = cursor.execute(exportOracleSql)
    time.sleep(1000)
    cursor.close()
    conn.close()

threads = []
t1 = threading.Thread(target=exp01,name='exp01')
threads.append(t1)
t2 = threading.Thread(target=exp02,name='exp02')
threads.append(t2)
t2 = threading.Thread(target=exp03,name='exp03')
threads.append(t2)
t2 = threading.Thread(target=exp04,name='exp04')
threads.append(t2)
t2 = threading.Thread(target=exp05,name='exp05')
threads.append(t2)
t2 = threading.Thread(target=exp06,name='exp06')
threads.append(t2)
t2 = threading.Thread(target=exp07,name='exp07')
threads.append(t2)
t2 = threading.Thread(target=exp08,name='exp08')
threads.append(t2)
t2 = threading.Thread(target=exp09,name='exp09')
threads.append(t2)
t2 = threading.Thread(target=exp10,name='exp10')
threads.append(t2)
t2 = threading.Thread(target=exp11,name='exp11')
threads.append(t2)
t2 = threading.Thread(target=exp12,name='exp12')
threads.append(t2)
t2 = threading.Thread(target=exp13,name='exp13')
threads.append(t2)
t2 = threading.Thread(target=exp14,name='exp14')
threads.append(t2)

if __name__ == '__main__':
  for t in threads:
    #t.setDaemon(True)
    t.start()
    #t.run()
    #t.start()
    # print '3333333'
    print threading.current_thread()
    # print t.is_alive()
    # print '3333333'
  t.join()
  print "all over "


输出:
C:\Python27\python.exe C:/Users/TLCB/PycharmProjects/untitled/mycompany/thread/p7.py
<_MainThread(MainThread, started 156528)>
<_MainThread(MainThread, started 156528)>
<_MainThread(MainThread, started 156528)>
<_MainThread(MainThread, started 156528)>
<_MainThread(MainThread, started 156528)>
<_MainThread(MainThread, started 156528)>
<_MainThread(MainThread, started 156528)>
<_MainThread(MainThread, started 156528)>
<_MainThread(MainThread, started 156528)>
<_MainThread(MainThread, started 156528)>
<_MainThread(MainThread, started 156528)>
<_MainThread(MainThread, started 156528)>
<_MainThread(MainThread, started 156528)>
<_MainThread(MainThread, started 156528)>
<Thread(exp01, started 155004)>
select 'exp01' from dual
<Thread(exp12, started 155744)>
 select 'exp12' from dual<Thread(exp02, started 155000)>

select 'exp02' from dual
<Thread(exp08, started 155728)>
select 'exp08' from dual
<Thread(exp06, started 155752)>
select 'exp06' from dual
<Thread(exp03, started 154816)>
select 'exp03' from dual
<Thread(exp09, started 156544)>
select 'exp09' from dual
<Thread(exp11, started 155760)>
select 'exp11' from dual
<Thread(exp04, started 154112)>
select 'exp04' from dual
<Thread(exp10, started 155764)><Thread(exp05, started 154640)>

select 'exp10' from dualselect 'exp05' from dual

<Thread(exp07, started 155188)>
select 'exp07' from dual
<Thread(exp13, started 154600)>
select 'exp13' from dual
<Thread(exp14, started 155804)>
select 'exp14' from dual


    SID SERIAL# USERNAME    PREV_SQL_ID
1   9   1179    TEST    01tjnxmmurdw7
2   10  75  TEST    g5ph474nsjvwv
3   12  907 TEST    87mdhpgj9k5tz
4   419 1303    TEST    4g8r4bkf8aq3n
5   420 655 TEST    1rx9mjdvp1udx
6   421 1955    TEST    928r7khrtn4jd
7   424 51  TEST    d6sgjjwpm74qz
8   839 3   TEST    a1hg7hrwgrdqk
9   840 43  TEST    fqjuj4qp5hmf0
10  841 111 TEST    2jzx0889h3k5n
11  1252    145 TEST    awtzfbx7dhn88
12  1253    7   TEST    55tzs9gdmcd4p
13  1254    9   TEST    4v01fvb5sj7k4
14  1255    265 TEST    39bcsfjr5y62b


此时是并发执行



改变join的位置:
#coding=utf-8
import threading
import time
import cx_Oracle
from pprint import pprint
import csv
table_name = "dbtest.csv"
f = open(table_name + ".csv", "w")

def exp01():
  conn = cx_Oracle.connect('test/test@192.168.137.2/serv')
  cursor = conn.cursor()
  owner = "system"
  writer = csv.writer(f, lineterminator="\n", quoting=csv.QUOTE_NONNUMERIC)
  tname = threading.current_thread()
  print tname
  exportOracleSql = "select 'exp01' from dual"
  print exportOracleSql
  x = cursor.execute(exportOracleSql)
  time.sleep(1000)
  cursor.close()
  conn.close()

def exp02():
  conn = cx_Oracle.connect('test/test@192.168.137.2/serv')
  cursor = conn.cursor()
  owner = "system"
  writer = csv.writer(f, lineterminator="\n", quoting=csv.QUOTE_NONNUMERIC)
  tname = threading.current_thread()
  print tname
  exportOracleSql = "select 'exp02' from dual"
  print exportOracleSql
  x = cursor.execute(exportOracleSql)
  time.sleep(1000)
  cursor.close()
  conn.close()


def exp03():
    conn = cx_Oracle.connect('test/test@192.168.137.2/serv')
    cursor = conn.cursor()
    owner = "system"
    writer = csv.writer(f, lineterminator="\n", quoting=csv.QUOTE_NONNUMERIC)
    tname = threading.current_thread()
    print tname
    exportOracleSql = "select 'exp03' from dual"
    print exportOracleSql
    x = cursor.execute(exportOracleSql)
    time.sleep(1000)
    cursor.close()
    conn.close()

def exp04():
    conn = cx_Oracle.connect('test/test@192.168.137.2/serv')
    cursor = conn.cursor()
    owner = "system"
    writer = csv.writer(f, lineterminator="\n", quoting=csv.QUOTE_NONNUMERIC)
    tname = threading.current_thread()
    print tname
    exportOracleSql = "select 'exp04' from dual"
    print exportOracleSql
    x = cursor.execute(exportOracleSql)
    time.sleep(1000)
    cursor.close()
    conn.close()

def exp05():
    conn = cx_Oracle.connect('test/test@192.168.137.2/serv')
    cursor = conn.cursor()
    owner = "system"
    writer = csv.writer(f, lineterminator="\n", quoting=csv.QUOTE_NONNUMERIC)
    tname = threading.current_thread()
    print tname
    exportOracleSql = "select 'exp05' from dual"
    print exportOracleSql
    x = cursor.execute(exportOracleSql)
    time.sleep(1000)
    cursor.close()
    conn.close()

def exp06():
    conn = cx_Oracle.connect('test/test@192.168.137.2/serv')
    cursor = conn.cursor()
    owner = "system"
    writer = csv.writer(f, lineterminator="\n", quoting=csv.QUOTE_NONNUMERIC)
    tname = threading.current_thread()
    print tname
    exportOracleSql = "select 'exp06' from dual"
    print exportOracleSql
    x = cursor.execute(exportOracleSql)
    time.sleep(1000)
    cursor.close()
    conn.close()

def exp07():
    conn = cx_Oracle.connect('test/test@192.168.137.2/serv')
    cursor = conn.cursor()
    owner = "system"
    writer = csv.writer(f, lineterminator="\n", quoting=csv.QUOTE_NONNUMERIC)
    tname = threading.current_thread()
    print tname
    exportOracleSql = "select 'exp07' from dual"
    print exportOracleSql
    x = cursor.execute(exportOracleSql)
    time.sleep(1000)
    cursor.close()
    conn.close()

def exp08():
    conn = cx_Oracle.connect('test/test@192.168.137.2/serv')
    cursor = conn.cursor()
    owner = "system"
    writer = csv.writer(f, lineterminator="\n", quoting=csv.QUOTE_NONNUMERIC)
    tname = threading.current_thread()
    print tname
    exportOracleSql = "select 'exp08' from dual"
    print exportOracleSql
    x = cursor.execute(exportOracleSql)
    time.sleep(1000)
    cursor.close()
    conn.close()

def exp09():
    conn = cx_Oracle.connect('test/test@192.168.137.2/serv')
    cursor = conn.cursor()
    owner = "system"
    writer = csv.writer(f, lineterminator="\n", quoting=csv.QUOTE_NONNUMERIC)
    tname = threading.current_thread()
    print tname
    exportOracleSql = "select 'exp09' from dual"
    print exportOracleSql
    x = cursor.execute(exportOracleSql)
    time.sleep(1000)
    cursor.close()
    conn.close()

def exp10():
    conn = cx_Oracle.connect('test/test@192.168.137.2/serv')
    cursor = conn.cursor()
    owner = "system"
    writer = csv.writer(f, lineterminator="\n", quoting=csv.QUOTE_NONNUMERIC)
    tname = threading.current_thread()
    print tname
    exportOracleSql = "select 'exp10' from dual"
    print exportOracleSql
    x = cursor.execute(exportOracleSql)
    time.sleep(1000)
    cursor.close()
    conn.close()

def exp11():
    conn = cx_Oracle.connect('test/test@192.168.137.2/serv')
    cursor = conn.cursor()
    owner = "system"
    writer = csv.writer(f, lineterminator="\n", quoting=csv.QUOTE_NONNUMERIC)
    tname = threading.current_thread()
    print tname
    exportOracleSql = "select 'exp11' from dual"
    print exportOracleSql
    x = cursor.execute(exportOracleSql)
    time.sleep(1000)
    cursor.close()
    conn.close()

def exp12():
    conn = cx_Oracle.connect('test/test@192.168.137.2/serv')
    cursor = conn.cursor()
    owner = "system"
    writer = csv.writer(f, lineterminator="\n", quoting=csv.QUOTE_NONNUMERIC)
    tname = threading.current_thread()
    print tname
    exportOracleSql = "select 'exp12' from dual"
    print exportOracleSql
    x = cursor.execute(exportOracleSql)
    time.sleep(1000)
    cursor.close()
    conn.close()

def exp13():
    conn = cx_Oracle.connect('test/test@192.168.137.2/serv')
    cursor = conn.cursor()
    owner = "system"
    writer = csv.writer(f, lineterminator="\n", quoting=csv.QUOTE_NONNUMERIC)
    tname = threading.current_thread()
    print tname
    exportOracleSql = "select 'exp13' from dual"
    print exportOracleSql
    x = cursor.execute(exportOracleSql)
    time.sleep(1000)
    cursor.close()
    conn.close()

def exp14():
    conn = cx_Oracle.connect('test/test@192.168.137.2/serv')
    cursor = conn.cursor()
    owner = "system"
    writer = csv.writer(f, lineterminator="\n", quoting=csv.QUOTE_NONNUMERIC)
    tname = threading.current_thread()
    print tname
    exportOracleSql = "select 'exp14' from dual"
    print exportOracleSql
    x = cursor.execute(exportOracleSql)
    time.sleep(1000)
    cursor.close()
    conn.close()

threads = []
t1 = threading.Thread(target=exp01,name='exp01')
threads.append(t1)
t2 = threading.Thread(target=exp02,name='exp02')
threads.append(t2)
t2 = threading.Thread(target=exp03,name='exp03')
threads.append(t2)
t2 = threading.Thread(target=exp04,name='exp04')
threads.append(t2)
t2 = threading.Thread(target=exp05,name='exp05')
threads.append(t2)
t2 = threading.Thread(target=exp06,name='exp06')
threads.append(t2)
t2 = threading.Thread(target=exp07,name='exp07')
threads.append(t2)
t2 = threading.Thread(target=exp08,name='exp08')
threads.append(t2)
t2 = threading.Thread(target=exp09,name='exp09')
threads.append(t2)
t2 = threading.Thread(target=exp10,name='exp10')
threads.append(t2)
t2 = threading.Thread(target=exp11,name='exp11')
threads.append(t2)
t2 = threading.Thread(target=exp12,name='exp12')
threads.append(t2)
t2 = threading.Thread(target=exp13,name='exp13')
threads.append(t2)
t2 = threading.Thread(target=exp14,name='exp14')
threads.append(t2)

if __name__ == '__main__':
  for t in threads:
    #t.setDaemon(True)
    t.start()
    #t.run()
    #t.start()
    # print '3333333'
    print threading.current_thread()
    # print t.is_alive()
    # print '3333333'
    t.join()
  print "all over "



C:\Python27\python.exe C:/Users/TLCB/PycharmProjects/untitled/mycompany/thread/p7.py
<_MainThread(MainThread, started 154776)>
<Thread(exp01, started 156240)>
select 'exp01' from dual


此时变成串行,数据库连接也只有一个:

    SID SERIAL# USERNAME    PREV_SQL_ID
1   421 1957    TEST    928r7khrtn4jd

以上这篇python 多线程串行和并行的实例就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持服务器之家。

原文链接：https://blog.csdn.net/zhaoyangjian724/article/details/77910808