scrapy通过连接池连接mysql工具(python3)

scrapy通过连接池连接mysql工具(python3)

背景:自己写的简单爬取电影种子的爬虫,数据存储到Mysql

版本:python3

IDE:pycharm

环境:windows10

项目:scrapy爬虫

注:如使用,请自行修改,谢谢

 

工具文件如下:

"""
数据库连接工具类
# """
import pymysql
import traceback
from DBUtils.PooledDB import PooledDB
from scrapy.utils.project import get_project_settings


class MysqlUtil(object):

    # 获取setting文件中的配置
    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 , 此类中的连接采用连接池实现获取连接对象:conn = Mysql.getConn()
            释放连接对象;conn.close()或del conn
    """
    # 连接池对象
    __pool = None

    def __init__(self):
        # 数据库构造函数,从连接池中取出连接,并生成操作游标
        self._conn = MysqlUtil.get_conn()
        self._cursor = self._conn.cursor()

    # 获取链接
    @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()

    # 查询所有数据
    def get_all(self, sql, param=None):
        """
        @summary: 执行查询,并取出所有结果集
        @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 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)

    # 查询某一个数据
    def get_one(self, sql, param=None):
        """
        @summary: 执行查询,并取出第一条
        @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 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)

    # 查询数量
    def get_count(self, sql, param=None):
        """
        @summary: 执行查询,返回结果数
        @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 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)

    # 查询部分
    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)

    # 插入一条数据
    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")

    # 插入多条数据
    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 __get_insert_id(self):
    #     """
    #     获取当前连接最后一次插入操作生成的id,如果没有则为0
    #     """
    #     self._cursor.execute("SELECT @@IDENTITY AS id")
    #     result = self._cursor.fetchall()
    #     return result[0]['id']

    # 执行sql
    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)

    # 更新
    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)

    # 删除
    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()

Mysql与logger配置如下:(在setting.py文件中,其余自行配置)

import datetime
# start MySQL database configure setting
MYSQL_HOST = "127.0.0.1"
MYSQL_PORT = 3306
MYSQL_DATABASE = "crawler_db"
MYSQL_USER = "admin"
MYSQL_PASSWORD = "admin"
MYSQL_CHARSET = "utf8"
# end of MySQL database configure setting

# start logger configure setting
current_day = datetime.datetime.now()
LOG_ENABLED = True  # 启用日志,默认不启用
LOG_ENCODING = 'utf-8'
LOG_FILE = "C:/xxx_spider.{}-{}-{}.log".format(current_day.year, current_day.month, current_day.day)
LOG_LEVEL = "INFO"
LOG_STDOUT = True  # 输出重定向至log日志,比如print
# end logger configure setting

调用方式如下:

# -*- coding: utf-8 -*-
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

 

posted @ 2019-01-15 22:21 故意养只喵叫顺儿 阅读( ...) 评论( ...) 编辑 收藏

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