單例模式代碼
mysql_test.py
from functools import wraps import pymysql def single(cls): """實現類的單例模式""" instance_dict = dict() @wraps(cls) def single_instance(*args,**kwargs): if cls not in instance_dict: instance_dict[cls] = cls(*args,**kwargs) return instance_dict[cls] return single_instance @single class PyMySQLTest(object): def __init__(self,db_name): self.coon = None self.cursor = None self.db_name = db_name try: self.coon = pymysql.connect(host="xx",port=xx,user="xx",password="xx",database=self.db_name,charset="utf8") self.cursor = self.coon.cursor() except Exception as e: raise e def get_all(self): sql = "select cow_number from cow_info where isdelete=0" self.cursor.execute(sql) result = self.cursor.fetchall() print(result)
test_code.py
from single_pool.test_mysql import mysql_test,mysql_pool_test from threading import Thread import threading import time single_instance = mysql_test.PyMySQLTest("cattle") # lock = threading.Lock() def test(): global count print(id(single_instance)) print("\n") single_instance.get_all() if __name__ == '__main__': start_time = time.time() # 創建100個線程鏈接實例，測試獲取數據 for i in range(10): t = Thread(target=test) t.start() end_time = time.time() print(end_time-start_time)
輸出結果：
40899976 40899976 40899976 40899976 40899976 40899976 40899976 40899976 40899976 40899976 0.0020003318786621094
報錯結果
pymysql.err.OperationalError: (2013, 'Lost connection to MySQL server during query')
錯誤原因：
一：MySQL持久化鏈接保持時間為8小時(28800秒），過期后斷開連。如果數據庫沒有新建連接，則會報此錯。我這里肯定達不到這個條件 二：因為mysql有一個默認的connect_timeout時間，一旦超過，會自動關閉連接。看看myql和pymysql的文檔。# TODO pymysql.err.InternalError: Packet sequence number wrong - got 110 expected 2 錯誤原因：
一：使用了多線程，多線程共享了同一個數據庫連接，但每個execute前沒有加上互斥鎖 AttributeError: 'NoneType' object has no attribute 'read'
錯誤原因：不詳
給代碼加上互斥鎖看看情況
from single_pool.test_mysql import mysql_test,mysql_pool_test from threading import Thread import threading import time single_instance = mysql_test.PyMySQLTest("cattle") lock = threading.Lock() def test(l): single_instance.get_all(l) if __name__ == '__main__': start_time = time.time() # 創建100個線程鏈接實例，測試獲取數據 for i in range(10): t = Thread(target=test,args=(lock,)) t.start() end_time = time.time() print(end_time-start_time)
def get_all(self,l): sql = "select cow_number from cow_info where isdelete=0" l.acquire() self.cursor.execute(sql) l.release() result = self.cursor.fetchall() print(result)
輸出結果
0.002000093460083008 (('1002',), ('1005',), ('2007',), ('3001',), ('3004',), ('868201803000700',), ('868201803000704',), ('868201803000702',), ('868201803000696',), ('868201803000701',), ('868201803000697',), ('868201803000699',), ('868201803000689',), ('868201803000682',), ('868201803000695',), ('868201803000688',), ('868201803000681',), ('868201803000703',), ('868201803000674',), ('868201803000651',), ('180078',), ('180025',), ('130558',), ('160080',), ('160090',), ('170071',), ('170087',), ('170099',), ('170135',), ('150153',), ('160073',), ('170083',), ('150037',), ('150249',), ('160168',), ('160002',), ('170080',), ('140157',), ('160225',), ('140161',), ('140588',), ('160804',), ('140170',), ('160068',), ('16411',), ('160527',), ('180070',), ('180026',), ('180034',), ('180004',), ('1003',), ('130653',), ('160170',), ('180753',), ('180795',), ('180698',), ('180675',), ('20191001',), ('20191002',), ('140680',), ('170058',), ('170159',), ('160059',), ('170095',), ('150092',), ('20200221',), ('20200224',), ('20200226',), ('130739',), ('160169',), ('150641',), ('160829',), ('20200301',), ('2020030111',), ('202003011112',), ('170151',), ('150350',), ('180007',), ('110615',), ('160250',), ('170107',), ('150039',), ('170153',), ('110926',), ('170136',), ('160097',), ('160423',), ('160329',), ('170069',), ('170152',), ('140738',), ('110301',), ('170092',), ('160098',), ('150090',), ('180748',)) (('1002',), ('1005',), ('2007',), ('3001',), ('3004',), ('868201803000700',), ('868201803000704',), ('868201803000702',), ('868201803000696',), ('868201803000701',), ('868201803000697',), ('868201803000699',), ('868201803000689',), ('868201803000682',), ('868201803000695',), ('868201803000688',), ('868201803000681',), ('868201803000703',), ('868201803000674',), ('868201803000651',), ('180078',), ('180025',), ('130558',), ('160080',), ('160090',), ('170071',), ('170087',), ('170099',), ('170135',), ('150153',), ('160073',), ('170083',), ('150037',), ('150249',), ('160168',), ('160002',), ('170080',), ('140157',), ('160225',), ('140161',), ('140588',), ('160804',), ('140170',), ('160068',), ('16411',), ('160527',), ('180070',), ('180026',), ('180034',), ('180004',), ('1003',), ('130653',), ('160170',), ('180753',), ('180795',), ('180698',), ('180675',), ('20191001',), ('20191002',), ('140680',), ('170058',), ('170159',), ('160059',), ('170095',), ('150092',), ('20200221',), ('20200224',), ('20200226',), ('130739',), ('160169',), ('150641',), ('160829',), ('20200301',), ('2020030111',), ('202003011112',), ('170151',), ('150350',), ('180007',), ('110615',), ('160250',), ('170107',), ('150039',), ('170153',), ('110926',), ('170136',), ('160097',), ('160423',), ('160329',), ('170069',), ('170152',), ('140738',), ('110301',), ('170092',), ('160098',), ('150090',), ('180748',)) (('1002',), ('1005',), ('2007',), ('3001',), ('3004',), ('868201803000700',), ('868201803000704',), ('868201803000702',), ('868201803000696',), ('868201803000701',), ('868201803000697',), ('868201803000699',), ('868201803000689',), ('868201803000682',), ('868201803000695',), ('868201803000688',), ('868201803000681',), ('868201803000703',), ('868201803000674',), ('868201803000651',), ('180078',), ('180025',), ('130558',), ('160080',), ('160090',), ('170071',), ('170087',), ('170099',), ('170135',), ('150153',), ('160073',), ('170083',), ('150037',), ('150249',), ('160168',), ('160002',), ('170080',), ('140157',), ('160225',), ('140161',), ('140588',), ('160804',), ('140170',), ('160068',), ('16411',), ('160527',), ('180070',), ('180026',), ('180034',), ('180004',), ('1003',), ('130653',), ('160170',), ('180753',), ('180795',), ('180698',), ('180675',), ('20191001',), ('20191002',), ('140680',), ('170058',), ('170159',), ('160059',), ('170095',), ('150092',), ('20200221',), ('20200224',), ('20200226',), ('130739',), ('160169',), ('150641',), ('160829',), ('20200301',), ('2020030111',), ('202003011112',), ('170151',), ('150350',), ('180007',), ('110615',), ('160250',), ('170107',), ('150039',), ('170153',), ('110926',), ('170136',), ('160097',), ('160423',), ('160329',), ('170069',), ('170152',), ('140738',), ('110301',), ('170092',), ('160098',), ('150090',), ('180748',)) (('1002',), ('1005',), ('2007',), ('3001',), ('3004',), ('868201803000700',), ('868201803000704',), ('868201803000702',), ('868201803000696',), ('868201803000701',), ('868201803000697',), ('868201803000699',), ('868201803000689',), ('868201803000682',), ('868201803000695',), ('868201803000688',), ('868201803000681',), ('868201803000703',), ('868201803000674',), ('868201803000651',), ('180078',), ('180025',), ('130558',), ('160080',), ('160090',), ('170071',), ('170087',), ('170099',), ('170135',), ('150153',), ('160073',), ('170083',), ('150037',), ('150249',), ('160168',), ('160002',), ('170080',), ('140157',), ('160225',), ('140161',), ('140588',), ('160804',), ('140170',), ('160068',), ('16411',), ('160527',), ('180070',), ('180026',), ('180034',), ('180004',), ('1003',), ('130653',), ('160170',), ('180753',), ('180795',), ('180698',), ('180675',), ('20191001',), ('20191002',), ('140680',), ('170058',), ('170159',), ('160059',), ('170095',), ('150092',), ('20200221',), ('20200224',), ('20200226',), ('130739',), ('160169',), ('150641',), ('160829',), ('20200301',), ('2020030111',), ('202003011112',), ('170151',), ('150350',), ('180007',), ('110615',), ('160250',), ('170107',), ('150039',), ('170153',), ('110926',), ('170136',), ('160097',), ('160423',), ('160329',), ('170069',), ('170152',), ('140738',), ('110301',), ('170092',), ('160098',), ('150090',), ('180748',)) (('1002',), ('1005',), ('2007',), ('3001',), ('3004',), ('868201803000700',), ('868201803000704',), ('868201803000702',), ('868201803000696',), ('868201803000701',), ('868201803000697',), ('868201803000699',), ('868201803000689',), ('868201803000682',), ('868201803000695',), ('868201803000688',), ('868201803000681',), ('868201803000703',), ('868201803000674',), ('868201803000651',), ('180078',), ('180025',), ('130558',), ('160080',), ('160090',), ('170071',), ('170087',), ('170099',), ('170135',), ('150153',), ('160073',), ('170083',), ('150037',), ('150249',), ('160168',), ('160002',), ('170080',), ('140157',), ('160225',), ('140161',), ('140588',), ('160804',), ('140170',), ('160068',), ('16411',), ('160527',), ('180070',), ('180026',), ('180034',), ('180004',), ('1003',), ('130653',), ('160170',), ('180753',), ('180795',), ('180698',), ('180675',), ('20191001',), ('20191002',), ('140680',), ('170058',), ('170159',), ('160059',), ('170095',), ('150092',), ('20200221',), ('20200224',), ('20200226',), ('130739',), ('160169',), ('150641',), ('160829',), ('20200301',), ('2020030111',), ('202003011112',), ('170151',), ('150350',), ('180007',), ('110615',), ('160250',), ('170107',), ('150039',), ('170153',), ('110926',), ('170136',), ('160097',), ('160423',), ('160329',), ('170069',), ('170152',), ('140738',), ('110301',), ('170092',), ('160098',), ('150090',), ('180748',)) (('1002',), ('1005',), ('2007',), ('3001',), ('3004',), ('868201803000700',), ('868201803000704',), ('868201803000702',), ('868201803000696',), ('868201803000701',), ('868201803000697',), ('868201803000699',), ('868201803000689',), ('868201803000682',), ('868201803000695',), ('868201803000688',), ('868201803000681',), ('868201803000703',), ('868201803000674',), ('868201803000651',), ('180078',), ('180025',), ('130558',), ('160080',), ('160090',), ('170071',), ('170087',), ('170099',), ('170135',), ('150153',), ('160073',), ('170083',), ('150037',), ('150249',), ('160168',), ('160002',), ('170080',), ('140157',), ('160225',), ('140161',), ('140588',), ('160804',), ('140170',), ('160068',), ('16411',), ('160527',), ('180070',), ('180026',), ('180034',), ('180004',), ('1003',), ('130653',), ('160170',), ('180753',), ('180795',), ('180698',), ('180675',), ('20191001',), ('20191002',), ('140680',), ('170058',), ('170159',), ('160059',), ('170095',), ('150092',), ('20200221',), ('20200224',), ('20200226',), ('130739',), ('160169',), ('150641',), ('160829',), ('20200301',), ('2020030111',), ('202003011112',), ('170151',), ('150350',), ('180007',), ('110615',), ('160250',), ('170107',), ('150039',), ('170153',), ('110926',), ('170136',), ('160097',), ('160423',), ('160329',), ('170069',), ('170152',), ('140738',), ('110301',), ('170092',), ('160098',), ('150090',), ('180748',)) (('1002',), ('1005',), ('2007',), ('3001',), ('3004',), ('868201803000700',), ('868201803000704',), ('868201803000702',), ('868201803000696',), ('868201803000701',), ('868201803000697',), ('868201803000699',), ('868201803000689',), ('868201803000682',), ('868201803000695',), ('868201803000688',), ('868201803000681',), ('868201803000703',), ('868201803000674',), ('868201803000651',), ('180078',), ('180025',), ('130558',), ('160080',), ('160090',), ('170071',), ('170087',), ('170099',), ('170135',), ('150153',), ('160073',), ('170083',), ('150037',), ('150249',), ('160168',), ('160002',), ('170080',), ('140157',), ('160225',), ('140161',), ('140588',), ('160804',), ('140170',), ('160068',), ('16411',), ('160527',), ('180070',), ('180026',), ('180034',), ('180004',), ('1003',), ('130653',), ('160170',), ('180753',), ('180795',), ('180698',), ('180675',), ('20191001',), ('20191002',), ('140680',), ('170058',), ('170159',), ('160059',), ('170095',), ('150092',), ('20200221',), ('20200224',), ('20200226',), ('130739',), ('160169',), ('150641',), ('160829',), ('20200301',), ('2020030111',), ('202003011112',), ('170151',), ('150350',), ('180007',), ('110615',), ('160250',), ('170107',), ('150039',), ('170153',), ('110926',), ('170136',), ('160097',), ('160423',), ('160329',), ('170069',), ('170152',), ('140738',), ('110301',), ('170092',), ('160098',), ('150090',), ('180748',)) (('1002',), ('1005',), ('2007',), ('3001',), ('3004',), ('868201803000700',), ('868201803000704',), ('868201803000702',), ('868201803000696',), ('868201803000701',), ('868201803000697',), ('868201803000699',), ('868201803000689',), ('868201803000682',), ('868201803000695',), ('868201803000688',), ('868201803000681',), ('868201803000703',), ('868201803000674',), ('868201803000651',), ('180078',), ('180025',), ('130558',), ('160080',), ('160090',), ('170071',), ('170087',), ('170099',), ('170135',), ('150153',), ('160073',), ('170083',), ('150037',), ('150249',), ('160168',), ('160002',), ('170080',), ('140157',), ('160225',), ('140161',), ('140588',), ('160804',), ('140170',), ('160068',), ('16411',), ('160527',), ('180070',), ('180026',), ('180034',), ('180004',), ('1003',), ('130653',), ('160170',), ('180753',), ('180795',), ('180698',), ('180675',), ('20191001',), ('20191002',), ('140680',), ('170058',), ('170159',), ('160059',), ('170095',), ('150092',), ('20200221',), ('20200224',), ('20200226',), ('130739',), ('160169',), ('150641',), ('160829',), ('20200301',), ('2020030111',), ('202003011112',), ('170151',), ('150350',), ('180007',), ('110615',), ('160250',), ('170107',), ('150039',), ('170153',), ('110926',), ('170136',), ('160097',), ('160423',), ('160329',), ('170069',), ('170152',), ('140738',), ('110301',), ('170092',), ('160098',), ('150090',), ('180748',)) (('1002',), ('1005',), ('2007',), ('3001',), ('3004',), ('868201803000700',), ('868201803000704',), ('868201803000702',), ('868201803000696',), ('868201803000701',), ('868201803000697',), ('868201803000699',), ('868201803000689',), ('868201803000682',), ('868201803000695',), ('868201803000688',), ('868201803000681',), ('868201803000703',), ('868201803000674',), ('868201803000651',), ('180078',), ('180025',), ('130558',), ('160080',), ('160090',), ('170071',), ('170087',), ('170099',), ('170135',), ('150153',), ('160073',), ('170083',), ('150037',), ('150249',), ('160168',), ('160002',), ('170080',), ('140157',), ('160225',), ('140161',), ('140588',), ('160804',), ('140170',), ('160068',), ('16411',), ('160527',), ('180070',), ('180026',), ('180034',), ('180004',), ('1003',), ('130653',), ('160170',), ('180753',), ('180795',), ('180698',), ('180675',), ('20191001',), ('20191002',), ('140680',), ('170058',), ('170159',), ('160059',), ('170095',), ('150092',), ('20200221',), ('20200224',), ('20200226',), ('130739',), ('160169',), ('150641',), ('160829',), ('20200301',), ('2020030111',), ('202003011112',), ('170151',), ('150350',), ('180007',), ('110615',), ('160250',), ('170107',), ('150039',), ('170153',), ('110926',), ('170136',), ('160097',), ('160423',), ('160329',), ('170069',), ('170152',), ('140738',), ('110301',), ('170092',), ('160098',), ('150090',), ('180748',)) (('1002',), ('1005',), ('2007',), ('3001',), ('3004',), ('868201803000700',), ('868201803000704',), ('868201803000702',), ('868201803000696',), ('868201803000701',), ('868201803000697',), ('868201803000699',), ('868201803000689',), ('868201803000682',), ('868201803000695',), ('868201803000688',), ('868201803000681',), ('868201803000703',), ('868201803000674',), ('868201803000651',), ('180078',), ('180025',), ('130558',), ('160080',), ('160090',), ('170071',), ('170087',), ('170099',), ('170135',), ('150153',), ('160073',), ('170083',), ('150037',), ('150249',), ('160168',), ('160002',), ('170080',), ('140157',), ('160225',), ('140161',), ('140588',), ('160804',), ('140170',), ('160068',), ('16411',), ('160527',), ('180070',), ('180026',), ('180034',), ('180004',), ('1003',), ('130653',), ('160170',), ('180753',), ('180795',), ('180698',), ('180675',), ('20191001',), ('20191002',), ('140680',), ('170058',), ('170159',), ('160059',), ('170095',), ('150092',), ('20200221',), ('20200224',), ('20200226',), ('130739',), ('160169',), ('150641',), ('160829',), ('20200301',), ('2020030111',), ('202003011112',), ('170151',), ('150350',), ('180007',), ('110615',), ('160250',), ('170107',), ('150039',), ('170153',), ('110926',), ('170136',), ('160097',), ('160423',), ('160329',), ('170069',), ('170152',), ('140738',), ('110301',), ('170092',), ('160098',), ('150090',), ('180748',))
然后將線程數量增加到100個，看結果，沒問題，200個，300個也沒有問題。
連接池代碼
class PyMySQLTest(object): def __init__(self,db_name): self.db_name = db_name try: self.pool = PooledDB( creator=pymysql, # 連接對象或者符合DB-API 2的數據庫模塊 maxconnections=10, # 通常允許的最大連接數，0或None表示任意數量的連接 mincached=5, # 池中空閑連接的數據，值為0表示啟動時未建立連接 maxcached=0, # 池中空閑連接的最大數目，即池的大小，0 None兩個值表示池大小不受限制 maxshared=3, # 最大共享連接數，0或None表示所有連接都是專用的，當達到此最大數量時，如果請求共享，則共享 blocking=True, # 制定了超過最大連接數量時的行為，如果為True,超過時，阻塞等待連接減少，否則報錯 maxusage=None, # 單個連接的最大重用次數，0或None表示無限重用，當達到連接的最大使用次數時，連接將自動重置即關閉連接后再打開 setsession=[], # 可用於准備的sql命令的可選列表會話，例如設置datestyle，設置時區等 ping=0, # 確定何時使用ping進行檢測連接，0或者None表示從不檢測，1表示從池中獲取時檢測，2表示創建光標時檢測，4表示執行查詢時檢測，7表示始終檢測，args,kwargs：應傳遞給創建者的參數 host = "xx", port = xx, user = "xx", password = "xx", database = self.db_name, charset = "utf8" ) except Exception as e: raise e def connect(self): self.coon = self.pool.connection() self.cursor = self.coon.cursor(cursor=pymysql.cursors.DictCursor) return self.cursor def get_all(self): cursor = self.connect() sql = "select cow_number from cow_info where isdelete=0" cursor.execute(sql) result = cursor.fetchall() print(result)
from single_pool.test_mysql import mysql_test,mysql_pool_test from threading import Thread import threading import time single_instance = mysql_pool_test.PyMySQLTest("cattle") def test(): single_instance.get_all() if __name__ == '__main__': start_time = time.time() # 創建100個線程鏈接實例，測試獲取數據 for i in range(10): t = Thread(target=test) t.start() end_time = time.time() print(end_time-start_time)
輸出結果
E:\python\python.exe F:/pycharm測試功能文件夾/single_pool/test_code.py 0.002000093460083008 Exception in thread Thread-1: Traceback (most recent call last): File "E:\python\lib\threading.py", line 926, in _bootstrap_inner self.run() File "E:\python\lib\threading.py", line 870, in run self._target(*self._args, **self._kwargs) File "F:/pycharm測試功能文件夾/single_pool/test_code.py", line 10, in test single_instance.get_all() File "F:\pycharm測試功能文件夾\single_pool\test_mysql\mysql_pool_test.py", line 47, in get_all cursor.execute(sql) File "E:\python\lib\site-packages\DBUtils\SteadyDB.py", line 605, in tough_method result = method(*args, **kwargs) # try to execute File "E:\python\lib\site-packages\pymysql\cursors.py", line 170, in execute result = self._query(query) File "E:\python\lib\site-packages\pymysql\cursors.py", line 328, in _query conn.query(q) File "E:\python\lib\site-packages\pymysql\connections.py", line 517, in query self._affected_rows = self._read_query_result(unbuffered=unbuffered) File "E:\python\lib\site-packages\pymysql\connections.py", line 732, in _read_query_result result.read() File "E:\python\lib\site-packages\pymysql\connections.py", line 1075, in read first_packet = self.connection._read_packet() File "E:\python\lib\site-packages\pymysql\connections.py", line 674, in _read_packet recv_data = self._read_bytes(bytes_to_read) File "E:\python\lib\site-packages\pymysql\connections.py", line 691, in _read_bytes data = self._rfile.read(num_bytes) AttributeError: 'NoneType' object has no attribute 'read' [{'cow_number': '1002'}, {'cow_number': '1005'}, {'cow_number': '2007'}, {'cow_number': '3001'}, {'cow_number': '3004'}, {'cow_number': '868201803000700'}, {'cow_number': '868201803000704'}, {'cow_number': '868201803000702'}, {'cow_number': '868201803000696'}, {'cow_number': '868201803000701'}, {'cow_number': '868201803000697'}, {'cow_number': '868201803000699'}, {'cow_number': '868201803000689'}, {'cow_number': '868201803000682'}, {'cow_number': '868201803000695'}, {'cow_number': '868201803000688'}, {'cow_number': '868201803000681'}, {'cow_number': '868201803000703'}, {'cow_number': '868201803000674'}, {'cow_number': '868201803000651'}, {'cow_number': '180078'}, {'cow_number': '180025'}, {'cow_number': '130558'}, {'cow_number': '160080'}, {'cow_number': '160090'}, {'cow_number': '170071'}, {'cow_number': '170087'}, {'cow_number': '170099'}, {'cow_number': '170135'}, {'cow_number': '150153'}, {'cow_number': '160073'}, {'cow_number': '170083'}, {'cow_number': '150037'}, {'cow_number': '150249'}, {'cow_number': '160168'}, {'cow_number': '160002'}, {'cow_number': '170080'}, {'cow_number': '140157'}, {'cow_number': '160225'}, {'cow_number': '140161'}, {'cow_number': '140588'}, {'cow_number': '160804'}, {'cow_number': '140170'}, {'cow_number': '160068'}, {'cow_number': '16411'}, {'cow_number': '160527'}, {'cow_number': '180070'}, {'cow_number': '180026'}, {'cow_number': '180034'}, {'cow_number': '180004'}, {'cow_number': '1003'}, {'cow_number': '130653'}, {'cow_number': '160170'}, {'cow_number': '180753'}, {'cow_number': '180795'}, {'cow_number': '180698'}, {'cow_number': '180675'}, {'cow_number': '20191001'}, {'cow_number': '20191002'}, {'cow_number': '140680'}, {'cow_number': '170058'}, {'cow_number': '170159'}, {'cow_number': '160059'}, {'cow_number': '170095'}, {'cow_number': '150092'}, {'cow_number': '20200221'}, {'cow_number': '20200224'}, {'cow_number': '20200226'}, {'cow_number': '130739'}, {'cow_number': '160169'}, {'cow_number': '150641'}, {'cow_number': '160829'}, {'cow_number': '20200301'}, {'cow_number': '2020030111'}, {'cow_number': '202003011112'}, {'cow_number': '170151'}, {'cow_number': '150350'}, {'cow_number': '180007'}, {'cow_number': '110615'}, {'cow_number': '160250'}, {'cow_number': '170107'}, {'cow_number': '150039'}, {'cow_number': '170153'}, {'cow_number': '110926'}, {'cow_number': '170136'}, {'cow_number': '160097'}, {'cow_number': '160423'}, {'cow_number': '160329'}, {'cow_number': '170069'}, {'cow_number': '170152'}, {'cow_number': '140738'}, {'cow_number': '110301'}, {'cow_number': '170092'}, {'cow_number': '160098'}, {'cow_number': '150090'}, {'cow_number': '180748'}] [{'cow_number': '1002'}, {'cow_number': '1005'}, {'cow_number': '2007'}, {'cow_number': '3001'}, {'cow_number': '3004'}, {'cow_number': '868201803000700'}, {'cow_number': '868201803000704'}, {'cow_number': '868201803000702'}, {'cow_number': '868201803000696'}, {'cow_number': '868201803000701'}, {'cow_number': '868201803000697'}, {'cow_number': '868201803000699'}, {'cow_number': '868201803000689'}, {'cow_number': '868201803000682'}, {'cow_number': '868201803000695'}, {'cow_number': '868201803000688'}, {'cow_number': '868201803000681'}, {'cow_number': '868201803000703'}, {'cow_number': '868201803000674'}, {'cow_number': '868201803000651'}, {'cow_number': '180078'}, {'cow_number': '180025'}, {'cow_number': '130558'}, {'cow_number': '160080'}, {'cow_number': '160090'}, {'cow_number': '170071'}, {'cow_number': '170087'}, {'cow_number': '170099'}, {'cow_number': '170135'}, {'cow_number': '150153'}, {'cow_number': '160073'}, {'cow_number': '170083'}, {'cow_number': '150037'}, {'cow_number': '150249'}, {'cow_number': '160168'}, {'cow_number': '160002'}, {'cow_number': '170080'}, {'cow_number': '140157'}, {'cow_number': '160225'}, {'cow_number': '140161'}, {'cow_number': '140588'}, {'cow_number': '160804'}, {'cow_number': '140170'}, {'cow_number': '160068'}, {'cow_number': '16411'}, {'cow_number': '160527'}, {'cow_number': '180070'}, {'cow_number': '180026'}, {'cow_number': '180034'}, {'cow_number': '180004'}, {'cow_number': '1003'}, {'cow_number': '130653'}, {'cow_number': '160170'}, {'cow_number': '180753'}, {'cow_number': '180795'}, {'cow_number': '180698'}, {'cow_number': '180675'}, {'cow_number': '20191001'}, {'cow_number': '20191002'}, {'cow_number': '140680'}, {'cow_number': '170058'}, {'cow_number': '170159'}, {'cow_number': '160059'}, {'cow_number': '170095'}, {'cow_number': '150092'}, {'cow_number': '20200221'}, {'cow_number': '20200224'}, {'cow_number': '20200226'}, {'cow_number': '130739'}, {'cow_number': '160169'}, {'cow_number': '150641'}, {'cow_number': '160829'}, {'cow_number': '20200301'}, {'cow_number': '2020030111'}, {'cow_number': '202003011112'}, {'cow_number': '170151'}, {'cow_number': '150350'}, {'cow_number': '180007'}, {'cow_number': '110615'}, {'cow_number': '160250'}, {'cow_number': '170107'}, {'cow_number': '150039'}, {'cow_number': '170153'}, {'cow_number': '110926'}, {'cow_number': '170136'}, {'cow_number': '160097'}, {'cow_number': '160423'}, {'cow_number': '160329'}, {'cow_number': '170069'}, {'cow_number': '170152'}, {'cow_number': '140738'}, {'cow_number': '110301'}, {'cow_number': '170092'}, {'cow_number': '160098'}, {'cow_number': '150090'}, {'cow_number': '180748'}] [{'cow_number': '1002'}, {'cow_number': '1005'}, {'cow_number': '2007'}, {'cow_number': '3001'}, {'cow_number': '3004'}, {'cow_number': '868201803000700'}, {'cow_number': '868201803000704'}, {'cow_number': '868201803000702'}, {'cow_number': '868201803000696'}, {'cow_number': '868201803000701'}, {'cow_number': '868201803000697'}, {'cow_number': '868201803000699'}, {'cow_number': '868201803000689'}, {'cow_number': '868201803000682'}, {'cow_number': '868201803000695'}, {'cow_number': '868201803000688'}, {'cow_number': '868201803000681'}, {'cow_number': '868201803000703'}, {'cow_number': '868201803000674'}, {'cow_number': '868201803000651'}, {'cow_number': '180078'}, {'cow_number': '180025'}, {'cow_number': '130558'}, {'cow_number': '160080'}, {'cow_number': '160090'}, {'cow_number': '170071'}, {'cow_number': '170087'}, {'cow_number': '170099'}, {'cow_number': '170135'}, {'cow_number': '150153'}, {'cow_number': '160073'}, {'cow_number': '170083'}, {'cow_number': '150037'}, {'cow_number': '150249'}, {'cow_number': '160168'}, {'cow_number': '160002'}, {'cow_number': '170080'}, {'cow_number': '140157'}, {'cow_number': '160225'}, {'cow_number': '140161'}, {'cow_number': '140588'}, {'cow_number': '160804'}, {'cow_number': '140170'}, {'cow_number': '160068'}, {'cow_number': '16411'}, {'cow_number': '160527'}, {'cow_number': '180070'}, {'cow_number': '180026'}, {'cow_number': '180034'}, {'cow_number': '180004'}, {'cow_number': '1003'}, {'cow_number': '130653'}, {'cow_number': '160170'}, {'cow_number': '180753'}, {'cow_number': '180795'}, {'cow_number': '180698'}, {'cow_number': '180675'}, {'cow_number': '20191001'}, {'cow_number': '20191002'}, {'cow_number': '140680'}, {'cow_number': '170058'}, {'cow_number': '170159'}, {'cow_number': '160059'}, {'cow_number': '170095'}, {'cow_number': '150092'}, {'cow_number': '20200221'}, {'cow_number': '20200224'}, {'cow_number': '20200226'}, {'cow_number': '130739'}, {'cow_number': '160169'}, {'cow_number': '150641'}, {'cow_number': '160829'}, {'cow_number': '20200301'}, {'cow_number': '2020030111'}, {'cow_number': '202003011112'}, {'cow_number': '170151'}, {'cow_number': '150350'}, {'cow_number': '180007'}, {'cow_number': '110615'}, {'cow_number': '160250'}, {'cow_number': '170107'}, {'cow_number': '150039'}, {'cow_number': '170153'}, {'cow_number': '110926'}, {'cow_number': '170136'}, {'cow_number': '160097'}, {'cow_number': '160423'}, {'cow_number': '160329'}, {'cow_number': '170069'}, {'cow_number': '170152'}, {'cow_number': '140738'}, {'cow_number': '110301'}, {'cow_number': '170092'}, {'cow_number': '160098'}, {'cow_number': '150090'}, {'cow_number': '180748'}] [{'cow_number': '1002'}, {'cow_number': '1005'}, {'cow_number': '2007'}, {'cow_number': '3001'}, {'cow_number': '3004'}, {'cow_number': '868201803000700'}, {'cow_number': '868201803000704'}, {'cow_number': '868201803000702'}, {'cow_number': '868201803000696'}, {'cow_number': '868201803000701'}, {'cow_number': '868201803000697'}, {'cow_number': '868201803000699'}, {'cow_number': '868201803000689'}, {'cow_number': '868201803000682'}, {'cow_number': '868201803000695'}, {'cow_number': '868201803000688'}, {'cow_number': '868201803000681'}, {'cow_number': '868201803000703'}, {'cow_number': '868201803000674'}, {'cow_number': '868201803000651'}, {'cow_number': '180078'}, {'cow_number': '180025'}, {'cow_number': '130558'}, {'cow_number': '160080'}, {'cow_number': '160090'}, {'cow_number': '170071'}, {'cow_number': '170087'}, {'cow_number': '170099'}, {'cow_number': '170135'}, {'cow_number': '150153'}, {'cow_number': '160073'}, {'cow_number': '170083'}, {'cow_number': '150037'}, {'cow_number': '150249'}, {'cow_number': '160168'}, {'cow_number': '160002'}, {'cow_number': '170080'}, {'cow_number': '140157'}, {'cow_number': '160225'}, {'cow_number': '140161'}, {'cow_number': '140588'}, {'cow_number': '160804'}, {'cow_number': '140170'}, {'cow_number': '160068'}, {'cow_number': '16411'}, {'cow_number': '160527'}, {'cow_number': '180070'}, {'cow_number': '180026'}, {'cow_number': '180034'}, {'cow_number': '180004'}, {'cow_number': '1003'}, {'cow_number': '130653'}, {'cow_number': '160170'}, {'cow_number': '180753'}, {'cow_number': '180795'}, {'cow_number': '180698'}, {'cow_number': '180675'}, {'cow_number': '20191001'}, {'cow_number': '20191002'}, {'cow_number': '140680'}, {'cow_number': '170058'}, {'cow_number': '170159'}, {'cow_number': '160059'}, {'cow_number': '170095'}, {'cow_number': '150092'}, {'cow_number': '20200221'}, {'cow_number': '20200224'}, {'cow_number': '20200226'}, {'cow_number': '130739'}, {'cow_number': '160169'}, {'cow_number': '150641'}, {'cow_number': '160829'}, {'cow_number': '20200301'}, {'cow_number': '2020030111'}, {'cow_number': '202003011112'}, {'cow_number': '170151'}, {'cow_number': '150350'}, {'cow_number': '180007'}, {'cow_number': '110615'}, {'cow_number': '160250'}, {'cow_number': '170107'}, {'cow_number': '150039'}, {'cow_number': '170153'}, {'cow_number': '110926'}, {'cow_number': '170136'}, {'cow_number': '160097'}, {'cow_number': '160423'}, {'cow_number': '160329'}, {'cow_number': '170069'}, {'cow_number': '170152'}, {'cow_number': '140738'}, {'cow_number': '110301'}, {'cow_number': '170092'}, {'cow_number': '160098'}, {'cow_number': '150090'}, {'cow_number': '180748'}] [{'cow_number': '1002'}, {'cow_number': '1005'}, {'cow_number': '2007'}, {'cow_number': '3001'}, {'cow_number': '3004'}, {'cow_number': '868201803000700'}, {'cow_number': '868201803000704'}, {'cow_number': '868201803000702'}, {'cow_number': '868201803000696'}, {'cow_number': '868201803000701'}, {'cow_number': '868201803000697'}, {'cow_number': '868201803000699'}, {'cow_number': '868201803000689'}, {'cow_number': '868201803000682'}, {'cow_number': '868201803000695'}, {'cow_number': '868201803000688'}, {'cow_number': '868201803000681'}, {'cow_number': '868201803000703'}, {'cow_number': '868201803000674'}, {'cow_number': '868201803000651'}, {'cow_number': '180078'}, {'cow_number': '180025'}, {'cow_number': '130558'}, {'cow_number': '160080'}, {'cow_number': '160090'}, {'cow_number': '170071'}, {'cow_number': '170087'}, {'cow_number': '170099'}, {'cow_number': '170135'}, {'cow_number': '150153'}, {'cow_number': '160073'}, {'cow_number': '170083'}, {'cow_number': '150037'}, {'cow_number': '150249'}, {'cow_number': '160168'}, {'cow_number': '160002'}, {'cow_number': '170080'}, {'cow_number': '140157'}, {'cow_number': '160225'}, {'cow_number': '140161'}, {'cow_number': '140588'}, {'cow_number': '160804'}, {'cow_number': '140170'}, {'cow_number': '160068'}, {'cow_number': '16411'}, {'cow_number': '160527'}, {'cow_number': '180070'}, {'cow_number': '180026'}, {'cow_number': '180034'}, {'cow_number': '180004'}, {'cow_number': '1003'}, {'cow_number': '130653'}, {'cow_number': '160170'}, {'cow_number': '180753'}, {'cow_number': '180795'}, {'cow_number': '180698'}, {'cow_number': '180675'}, {'cow_number': '20191001'}, {'cow_number': '20191002'}, {'cow_number': '140680'}, {'cow_number': '170058'}, {'cow_number': '170159'}, {'cow_number': '160059'}, {'cow_number': '170095'}, {'cow_number': '150092'}, {'cow_number': '20200221'}, {'cow_number': '20200224'}, {'cow_number': '20200226'}, {'cow_number': '130739'}, {'cow_number': '160169'}, {'cow_number': '150641'}, {'cow_number': '160829'}, {'cow_number': '20200301'}, {'cow_number': '2020030111'}, {'cow_number': '202003011112'}, {'cow_number': '170151'}, {'cow_number': '150350'}, {'cow_number': '180007'}, {'cow_number': '110615'}, {'cow_number': '160250'}, {'cow_number': '170107'}, {'cow_number': '150039'}, {'cow_number': '170153'}, {'cow_number': '110926'}, {'cow_number': '170136'}, {'cow_number': '160097'}, {'cow_number': '160423'}, {'cow_number': '160329'}, {'cow_number': '170069'}, {'cow_number': '170152'}, {'cow_number': '140738'}, {'cow_number': '110301'}, {'cow_number': '170092'}, {'cow_number': '160098'}, {'cow_number': '150090'}, {'cow_number': '180748'}] [{'cow_number': '1002'}, {'cow_number': '1005'}, {'cow_number': '2007'}, {'cow_number': '3001'}, {'cow_number': '3004'}, {'cow_number': '868201803000700'}, {'cow_number': '868201803000704'}, {'cow_number': '868201803000702'}, {'cow_number': '868201803000696'}, {'cow_number': '868201803000701'}, {'cow_number': '868201803000697'}, {'cow_number': '868201803000699'}, {'cow_number': '868201803000689'}, {'cow_number': '868201803000682'}, {'cow_number': '868201803000695'}, {'cow_number': '868201803000688'}, {'cow_number': '868201803000681'}, {'cow_number': '868201803000703'}, {'cow_number': '868201803000674'}, {'cow_number': '868201803000651'}, {'cow_number': '180078'}, {'cow_number': '180025'}, {'cow_number': '130558'}, {'cow_number': '160080'}, {'cow_number': '160090'}, {'cow_number': '170071'}, {'cow_number': '170087'}, {'cow_number': '170099'}, {'cow_number': '170135'}, {'cow_number': '150153'}, {'cow_number': '160073'}, {'cow_number': '170083'}, {'cow_number': '150037'}, {'cow_number': '150249'}, {'cow_number': '160168'}, {'cow_number': '160002'}, {'cow_number': '170080'}, {'cow_number': '140157'}, {'cow_number': '160225'}, {'cow_number': '140161'}, {'cow_number': '140588'}, {'cow_number': '160804'}, {'cow_number': '140170'}, {'cow_number': '160068'}, {'cow_number': '16411'}, {'cow_number': '160527'}, {'cow_number': '180070'}, {'cow_number': '180026'}, {'cow_number': '180034'}, {'cow_number': '180004'}, {'cow_number': '1003'}, {'cow_number': '130653'}, {'cow_number': '160170'}, {'cow_number': '180753'}, {'cow_number': '180795'}, {'cow_number': '180698'}, {'cow_number': '180675'}, {'cow_number': '20191001'}, {'cow_number': '20191002'}, {'cow_number': '140680'}, {'cow_number': '170058'}, {'cow_number': '170159'}, {'cow_number': '160059'}, {'cow_number': '170095'}, {'cow_number': '150092'}, {'cow_number': '20200221'}, {'cow_number': '20200224'}, {'cow_number': '20200226'}, {'cow_number': '130739'}, {'cow_number': '160169'}, {'cow_number': '150641'}, {'cow_number': '160829'}, {'cow_number': '20200301'}, {'cow_number': '2020030111'}, {'cow_number': '202003011112'}, {'cow_number': '170151'}, {'cow_number': '150350'}, {'cow_number': '180007'}, {'cow_number': '110615'}, {'cow_number': '160250'}, {'cow_number': '170107'}, {'cow_number': '150039'}, {'cow_number': '170153'}, {'cow_number': '110926'}, {'cow_number': '170136'}, {'cow_number': '160097'}, {'cow_number': '160423'}, {'cow_number': '160329'}, {'cow_number': '170069'}, {'cow_number': '170152'}, {'cow_number': '140738'}, {'cow_number': '110301'}, {'cow_number': '170092'}, {'cow_number': '160098'}, {'cow_number': '150090'}, {'cow_number': '180748'}] Exception in thread Thread-9: Traceback (most recent call last): File "E:\python\lib\threading.py", line 926, in _bootstrap_inner self.run() File "E:\python\lib\threading.py", line 870, in run self._target(*self._args, **self._kwargs) File "F:/pycharm測試功能文件夾/single_pool/test_code.py", line 10, in test single_instance.get_all() File "F:\pycharm測試功能文件夾\single_pool\test_mysql\mysql_pool_test.py", line 47, in get_all cursor.execute(sql) File "E:\python\lib\site-packages\DBUtils\SteadyDB.py", line 605, in tough_method result = method(*args, **kwargs) # try to execute File "E:\python\lib\site-packages\pymysql\cursors.py", line 170, in execute result = self._query(query) File "E:\python\lib\site-packages\pymysql\cursors.py", line 328, in _query conn.query(q) File "E:\python\lib\site-packages\pymysql\connections.py", line 517, in query self._affected_rows = self._read_query_result(unbuffered=unbuffered) File "E:\python\lib\site-packages\pymysql\connections.py", line 732, in _read_query_result result.read() File "E:\python\lib\site-packages\pymysql\connections.py", line 1082, in read self._read_result_packet(first_packet) File "E:\python\lib\site-packages\pymysql\connections.py", line 1152, in _read_result_packet self._read_rowdata_packet() File "E:\python\lib\site-packages\pymysql\connections.py", line 1186, in _read_rowdata_packet packet = self.connection._read_packet() File "E:\python\lib\site-packages\pymysql\connections.py", line 657, in _read_packet packet_header = self._read_bytes(4) File "E:\python\lib\site-packages\pymysql\connections.py", line 691, in _read_bytes data = self._rfile.read(num_bytes) AttributeError: 'NoneType' object has no attribute 'read' Exception in thread Thread-5: Traceback (most recent call last): File "E:\python\lib\threading.py", line 926, in _bootstrap_inner self.run() File "E:\python\lib\threading.py", line 870, in run self._target(*self._args, **self._kwargs) File "F:/pycharm測試功能文件夾/single_pool/test_code.py", line 10, in test single_instance.get_all() File "F:\pycharm測試功能文件夾\single_pool\test_mysql\mysql_pool_test.py", line 47, in get_all cursor.execute(sql) File "E:\python\lib\site-packages\DBUtils\SteadyDB.py", line 605, in tough_method result = method(*args, **kwargs) # try to execute File "E:\python\lib\site-packages\pymysql\cursors.py", line 170, in execute result = self._query(query) File "E:\python\lib\site-packages\pymysql\cursors.py", line 328, in _query conn.query(q) File "E:\python\lib\site-packages\pymysql\connections.py", line 516, in query self._execute_command(COMMAND.COM_QUERY, sql) File "E:\python\lib\site-packages\pymysql\connections.py", line 750, in _execute_command raise err.InterfaceError("(0, '')") pymysql.err.InterfaceError: (0, '') [{'cow_number': '1002'}, {'cow_number': '1005'}, {'cow_number': '2007'}, {'cow_number': '3001'}, {'cow_number': '3004'}, {'cow_number': '868201803000700'}, {'cow_number': '868201803000704'}, {'cow_number': '868201803000702'}, {'cow_number': '868201803000696'}, {'cow_number': '868201803000701'}, {'cow_number': '868201803000697'}, {'cow_number': '868201803000699'}, {'cow_number': '868201803000689'}, {'cow_number': '868201803000682'}, {'cow_number': '868201803000695'}, {'cow_number': '868201803000688'}, {'cow_number': '868201803000681'}, {'cow_number': '868201803000703'}, {'cow_number': '868201803000674'}, {'cow_number': '868201803000651'}, {'cow_number': '180078'}, {'cow_number': '180025'}, {'cow_number': '130558'}, {'cow_number': '160080'}, {'cow_number': '160090'}, {'cow_number': '170071'}, {'cow_number': '170087'}, {'cow_number': '170099'}, {'cow_number': '170135'}, {'cow_number': '150153'}, {'cow_number': '160073'}, {'cow_number': '170083'}, {'cow_number': '150037'}, {'cow_number': '150249'}, {'cow_number': '160168'}, {'cow_number': '160002'}, {'cow_number': '170080'}, {'cow_number': '140157'}, {'cow_number': '160225'}, {'cow_number': '140161'}, {'cow_number': '140588'}, {'cow_number': '160804'}, {'cow_number': '140170'}, {'cow_number': '160068'}, {'cow_number': '16411'}, {'cow_number': '160527'}, {'cow_number': '180070'}, {'cow_number': '180026'}, {'cow_number': '180034'}, {'cow_number': '180004'}, {'cow_number': '1003'}, {'cow_number': '130653'}, {'cow_number': '160170'}, {'cow_number': '180753'}, {'cow_number': '180795'}, {'cow_number': '180698'}, {'cow_number': '180675'}, {'cow_number': '20191001'}, {'cow_number': '20191002'}, {'cow_number': '140680'}, {'cow_number': '170058'}, {'cow_number': '170159'}, {'cow_number': '160059'}, {'cow_number': '170095'}, {'cow_number': '150092'}, {'cow_number': '20200221'}, {'cow_number': '20200224'}, {'cow_number': '20200226'}, {'cow_number': '130739'}, {'cow_number': '160169'}, {'cow_number': '150641'}, {'cow_number': '160829'}, {'cow_number': '20200301'}, {'cow_number': '2020030111'}, {'cow_number': '202003011112'}, {'cow_number': '170151'}, {'cow_number': '150350'}, {'cow_number': '180007'}, {'cow_number': '110615'}, {'cow_number': '160250'}, {'cow_number': '170107'}, {'cow_number': '150039'}, {'cow_number': '170153'}, {'cow_number': '110926'}, {'cow_number': '170136'}, {'cow_number': '160097'}, {'cow_number': '160423'}, {'cow_number': '160329'}, {'cow_number': '170069'}, {'cow_number': '170152'}, {'cow_number': '140738'}, {'cow_number': '110301'}, {'cow_number': '170092'}, {'cow_number': '160098'}, {'cow_number': '150090'}, {'cow_number': '180748'}] Process finished with exit code 0
# TODO
# 池中空閑連接的初始數目，0表示