Python schedule 库定时任务
schedule的使用
用于scrapy定时任务设置
import schedule
import time
def job():
print("Do Jod", time.time())
schedule.every(10).minutes.do(job)
schedule.every().hour.do(job)
schedule.every().day.at("10:30").do(job)
schedule.every(5).to(10).day.do(job)
schedule.every().monday.do(job)
schedule.every().wednesday.at("13:15").do(job)
schedule在scrapy的应用
import subprocess, schedule, time, datetime, logging
from multiprocessing import Process
from scrapy import cmdline
def crawl_work():
print("I'm working...")
## cmd = "scrapy crawl NanPing"
## subprocess.Popen(cmd)
## run(cmd, shell=True)
## pipe = subprocess.Popen(cmd, stdout=subprocess.PIPE).stdout
## print(pipe.read())
print('-'*100)
args = ["scrapy", "crawl", 'it']
while True:
start = time.time()
p = Process(target=cmdline.execute, args=(args,))
p.start()
p.join()
logging.debug("### use time: %s" % (time.time() - start))
if __name__=='__main__':
print('*'*10+'开始执行定时爬虫'+'*'*10)
schedule.every(1).minutes.do(crawl_work)
print('当前时间为{}'.format(datetime.datetime.now().strftime('%Y-%m-%d %H:%M:%S')))
print('*' * 10 + '定时爬虫开始运行' + '*' * 10)
while True:
schedule.run_pending()
time.sleep(10)
Sqlalchemy连接postgresql
import os
from sqlalchemy import create_engine
from sqlalchemy.orm import scoped_session, sessionmaker
postgresql+psycopg2://username:password@host/dbname
engine = create_engine("postgresql+psycopg2://postgres:88595073@localhost/lecture3")
db = scoped_session(sessionmaker(bind=engine))
def main():
result = db.execute("SELECT * FROM table_name").fetchall()
for r in result:
print(r)
if __name__ == "__main__":
main()
Scrapy通过连接池连接mysql工具
import pymysql
import traceback
from DBUtils.PooledDB import PooledDB
from scrapy.utils.project import get_project_settings
class MySqlUtil(object):
# 获取scrapy中settings的信息
settings = get_project_settings()
config = {
"host": settings.get("MYSQL_HOST"),
"port": settings.get("MYSQL_PORT"),
"database": settings.get("MYSQL_DATABASE"),
"user": settings.get("MYSQL_USER"),
"password": settings.get("MYSQL_PASSWORD"),
"charset": settings.get("MYSQL_CHARSET")
}
"""
MYSQL数据库对象，负责产生数据库连接
"""
# 连接池对象
__pool = None
def __init__(self):
self._conn = MysqlUtil.get_conn()
self._cursor = self._conn.cursor()
@staticmethod
def get_conn():
"""
@summary: 静态方法，从连接池中取出连接
@return： MySQLdb.connection
"""
if MysqlUtil.__pool is None:
__pool = PooledDB(creator=pymysql, mincached=1, maxcached=20, host=MysqlUtil.config['host'], port=MysqlUtil.config['port'], user=MysqlUtil.config['user'], passwd=MysqlUtil.config['password'], db=MysqlUtil.config['database'], charset=MysqlUtil.config['charset']))
return __pool.connection()
def get_all(self, sql, param=None):
"""
@summary: 执行查询， 并返回所有结果集
@param sql: 查询sql，如果有查询条件，请指定参数列表，并使用[param]传入
@param param: 可选参数，条件列表值（元组/列表）
@return: result list(字典对象)/boolean 查询到的结果集
"""
try:
if param is None:
count = self._cursor.execute(sql)
else:
count = self._cursor.execute(sql, param)
if count > 0:
result = self._cursor.fetchall()
else:
result = False
return result
except Exception as e:
traceback.print_exc(e)
def get_one(self, sql, param=None):
"""
@summary: 执行查询， 并返回所有结果集
@param sql: 查询sql，如果有查询条件，请指定参数列表，并使用[param]传入
@param param: 可选参数，条件列表值（元组/列表）
@return: result list/boolean 查询到的结果集
"""
try:
if param is None:
count = self._cursor.execute(sql)
else:
count = self._cursor.execute(sql, param)
if count > 0:
result = self._cursor.fetchone()
else:
result = False
return result
except Exception as e:
traceback.print_exc(e)
def get_count(self, sql, param=None):
"""
@summary: 执行查询， 并返回所有结果集
@param sql: 查询sql，如果有查询条件，请指定参数列表，并使用[param]传入
@param param: 可选参数，条件列表值（元组/列表）
@return: result list/boolean 查询到的结果集
"""
try:
if param is None:
count = self._cursor.execute(sql)
else:
count = self._cursor.execute(sql, param)
return count
except Exception as e:
traceback.print_exc(e)
def get_many(self, sql, num, param=None):
"""
@summary: 执行查询，并取出num条结果
@param sql:查询sql，如果有查询条件，请只指定条件列表，并将条件值使用参数[param]传递进来
@param num:取得的结果条数
@param param: 可选参数，条件列表值（元组/列表）
@return: result list/boolean 查询到的结果集
"""
try:
if param is None:
count = self._cursor.execute(sql)
else:
count = self._cursor.execute(sql, param)
if count > 0:
result = self._cursor.fetchmany(num)
else:
result = False
return result
except Exception as e:
traceback.print_exc(e)
def insert_one(self, sql, value):
"""
@summary: 向数据表插入一条记录
@param sql:要插入的sql格式
@param value:要插入的记录数据tuple/list
@return: insertId 受影响的行数
"""
try:
row_count = self._cursor.execute(sql, value)
return row_count
except Exception as e:
traceback.print_exc(e)
self.end("rollback")
def insert_many(self, sql, values):
"""
@summary: 向数据表插入多条记录
@param sql:要插入的sql格式
@param values:要插入的记录数据tuple(tuple)/list[list]
@return: count 受影响的行数
"""
try:
row_count = self._cursor.executemany(sql, values)
return row_count
except Exception as e:
traceback.print_exc(e)
self.end("rollback")
def __query(self, sql, param=None):
try:
if param is None:
count = self._cursor.execute(sql)
else:
count = self._cursor.execute(sql, param)
return count
except Exception as e:
traceback.print_exc(e)
def update(self, sql, param=None):
"""
@summary: 更新数据表记录
@param sql: sql格式及条件，使用(%s,%s)
@param param: 要更新的 值 tuple/list
@return: count 受影响的行数
"""
return self.__query(sql, param)
def delete(self, sql, param=None):
"""
@summary: 删除数据表记录
@param sql: sql格式及条件，使用(%s,%s)
@param param: 要删除的条件 值 tuple/list
@return: count 受影响的行数
"""
return self.__query(sql, param)
def begin(self):
"""
@summary: 开启事务
"""
self._conn.autocommit(0)
def end(self, option='commit'):
"""
@summary: 结束事务
"""
if option == 'commit':
self._conn.commit()
else:
self._conn.rollback()
def dispose(self, is_end=1):
"""
@summary: 释放连接池资源
"""
if is_end == 1:
self.end('commit')
else:
self.end('rollback')
self._cursor.close()
self._conn.close()
调用 pipeline
from torrentSpider.utils.db_util import MysqlUtil
import traceback
import logging
class MySqlPipeline(object):
pool = None
def __init__(self):
pass
# 开启爬虫时链接数据库
def open_spider(self, spider):
self.pool = MysqlUtil()
# 处理
def process_item(self, item, spider):
try:
# 执行sql语句
# sql = "select * from torrent_ye"
# count = self.pool.get_all(sql, None)
# print('查询数量为：' + str(count))
# 先去数据库查询，查到了就不入库了
sql_select = """select count(1) from torrent_ye where torrent_url = %(torrent_url)s"""
params_select = {'torrent_url': item['torrent_url']}
flag = self.pool.get_count(sql_select, params_select)
if flag > 0:
logging.info('记录已经存在:[%s][%s]', item['torrent_title'], item['torrent_url'])
return
sql_insert = """insert into torrent_ye(torrent_title, torrent_name, torrent_director,
torrent_actor, torrent_language, torrent_type, torrent_region, torrent_update_time,
torrent_status, torrent_show_time, torrent_introduction, torrent_url) values
(%(torrent_title)s,%(torrent_name)s,%(torrent_director)s,%(torrent_actor)s,%(torrent_language)s,
%(torrent_type)s,%(torrent_region)s,%(torrent_update_time)s,%(torrent_status)s,%(torrent_show_time)s,%(torrent_introduction)s,%(torrent_url)s)"""
params = {'torrent_title': item['torrent_title'], 'torrent_name': item['torrent_name'],
'torrent_director': item['torrent_director'], 'torrent_actor': item['torrent_actor'],
'torrent_language': item['torrent_language'], 'torrent_type': item['torrent_type'],
'torrent_region': item['torrent_region'], 'torrent_update_time': item['torrent_update_time'],
'torrent_status': item['torrent_status'], 'torrent_show_time': item['torrent_show_time'],
'torrent_introduction': item['torrent_introduction'], 'torrent_url': item['torrent_url']}
self.pool.insert_one(sql_insert, params)
self.pool.end("commit")
except Exception as e:
logging.error('发生异常:[%s]', e)
traceback.print_exc(e)
self.pool.end("rollback")
# 结束
def close_spider(self, spider):
pass
Original: https://www.cnblogs.com/outliver/p/15504628.html
Author: Grey_xx
Title: Python schedule 库定时任务
原创文章受到原创版权保护。转载请注明出处：https://www.johngo689.com/606928/
转载文章受原作者版权保护。转载请注明原作者出处！