python 多线程串行和并行的实例

如下所示：

#coding=utf-8import threadingimport timeimport cx_Oraclefrom pprint import pprintimport csvtable_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:\python/' target='_blank'>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    SIDSERIAL#USERNAMEPREV_SQL_ID191179TEST01tjnxmmurdw721075TESTg5ph474nsjvwv312907TEST87mdhpgj9k5tz44191303TEST4g8r4bkf8aq3n5420655TEST1rx9mjdvp1udx64211955TEST928r7khrtn4jd742451TESTd6sgjjwpm74qz88393TESTa1hg7hrwgrdqk984043TESTfqjuj4qp5hmf010841111TEST2jzx0889h3k5n111252145TESTawtzfbx7dhn881212537TEST55tzs9gdmcd4p1312549TEST4v01fvb5sj7k4141255265TEST39bcsfjr5y62b  此时是并发执行   改变join的位置:#coding=utf-8import threadingimport timeimport cx_Oraclefrom pprint import pprintimport csvtable_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:   SIDSERIAL#USERNAMEPREV_SQL_ID14211957TEST928r7khrtn4jd

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