Python schedule 庫定時任務

schedule的使用

# 用於scrapy定時任務設定
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的應用

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+'開始執行定時爬蟲'+'*'*10)
    schedule.every(1).minutes.do(crawl_work)
    print('當前時間為{}'.format(datetime.datetime.now().strftime('%Y-%m-%d %H:%M:%S')))
    print('*' * 10 + '定時爬蟲開始執行' + '*' * 10)
    while True:
        schedule.run_pending()
        time.sleep(10)

 

Sqlalchemy連線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通過連線池連線mysql工具

import pymysql
import traceback
from DBUtils.PooledDB import PooledDB
from scrapy.utils.project import get_project_settings


class MySqlUtil(object):
    
    # 獲取scrapy中settings的資訊
    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資料庫物件，負責產生資料庫連線
    """
    
    # 連線池物件
    __pool = None
    
    def __init__(self):
        self._conn = MysqlUtil.get_conn()
        self._cursor = self._conn.cursor()
    
    @staticmethod
    def get_conn():
        """
        @summary: 靜態方法，從連線池中取出連線
        @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: 執行查詢， 並返回所有結果集
        @param sql: 查詢sql，如果有查詢條件，請指定引數列表，並使用[param]傳入
        @param param: 可選引數，條件列表值（元組/列表）
        @return: result list(字典物件)/boolean 查詢到的結果集
        """
        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: 執行查詢， 並返回所有結果集
        @param sql: 查詢sql，如果有查詢條件，請指定引數列表，並使用[param]傳入
        @param param: 可選引數，條件列表值（元組/列表）
        @return: result list/boolean 查詢到的結果集
        """
        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: 執行查詢， 並返回所有結果集
        @param sql: 查詢sql，如果有查詢條件，請指定引數列表，並使用[param]傳入
        @param param: 可選引數，條件列表值（元組/列表）
        @return: result list/boolean 查詢到的結果集
        """
        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: 執行查詢，並取出num條結果
        @param sql:查詢sql，如果有查詢條件，請只指定條件列表，並將條件值使用引數[param]傳遞進來
        @param num:取得的結果條數
        @param param: 可選引數，條件列表值（元組/列表）
        @return: result list/boolean 查詢到的結果集
        """
        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: 向資料表插入一條記錄
        @param sql:要插入的sql格式
        @param value:要插入的記錄資料tuple/list
        @return: insertId 受影響的行數
        """
        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: 向資料表插入多條記錄
        @param sql:要插入的sql格式
        @param values:要插入的記錄資料tuple(tuple)/list[list]
        @return: count 受影響的行數
        """
        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: 更新資料表記錄
        @param sql: sql格式及條件，使用(%s,%s)
        @param param: 要更新的  值 tuple/list
        @return: count 受影響的行數
        """
        return self.__query(sql, param)

    def delete(self, sql, param=None):
        """
        @summary: 刪除資料表記錄
        @param sql: sql格式及條件，使用(%s,%s)
        @param param: 要刪除的條件 值 tuple/list
        @return: count 受影響的行數
        """
        return self.__query(sql, param)

    def begin(self):
        """
        @summary: 開啟事務
        """
        self._conn.autocommit(0)

    def end(self, option='commit'):
        """
        @summary: 結束事務
        """
        if option == 'commit':
            self._conn.commit()
        else:
            self._conn.rollback()

    def dispose(self, is_end=1):
        """
        @summary: 釋放連線池資源
        """
        if is_end == 1:
            self.end('commit')
        else:
            self.end('rollback')
        self._cursor.close()
        self._conn.close()

# 呼叫 pipeline
from torrentSpider.utils.db_util import MysqlUtil
import traceback
import logging


class MySqlPipeline(object):
    pool = None

    def __init__(self):
        pass

    # 開啟爬蟲時連結資料庫
    def open_spider(self, spider):
        self.pool = MysqlUtil()

    # 處理
    def process_item(self, item, spider):
        try:
            # 執行sql語句
            # sql = "select * from torrent_ye"
            # count = self.pool.get_all(sql, None)
            # print('查詢數量為：' + str(count))

            # 先去資料庫查詢，查到了就不入庫了
            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('記錄已經存在:[%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('發生異常:[%s]', e)
            traceback.print_exc(e)
            self.pool.end("rollback")

    # 結束
    def close_spider(self, spider):
        pass