Python中Scrapy+adbapi提高数据库写入效率实现

from twisted.enterprise import adbapi

# 初始化数据库连接池(线程池)
# 参数一：mysql的驱动
# 参数二：连接mysql的配置信息
dbpool = adbapi.ConnectionPool('pymysql', **params)

# 参数1：在异步任务中要执行的函数insert_db；
# 参数2：给该函数insert_db传递的参数
query = self.dbpool.runInteraction(self.do_insert, item)

# 在execute()之后，不需要再进行commit()，连接池内部会进行提交的操作。
def do_insert(self, cursor, item):
    insert_sql = """
            insert into qa_sample( 
            need_id, 
            need_question_uptime, 
            need_title, 
            need_title_describe, 
            need_answer_uptime, 
            need_answer)
            values (%s, %s, %s, %s, %s, %s)
            """
    params = (item['need_id'],
              item['need_question_uptime'],
              item['need_title'],
              item['need_title_describe'],
              item['need_answer_uptime'],
              item['need_answer'])
    cursor.execute(insert_sql, params)

# -*- coding: utf-8 -*-
from twisted.enterprise import adbapi
import pymysql
 
# Define your item pipelines here
#
# Don't forget to add your pipeline to the ITEM_PIPELINES setting
# See: https://docs.scrapy.org/en/latest/topics/item-pipeline.html
 
 
class QaSpiderPipeline(object):
    def process_item(self, item, spider):
        return item
 
class MysqlTwistedPipeline(object):
    def __init__(self, dbpool):
        self.dbpool = dbpool
 
    @classmethod
    def from_settings(cls, settings):
        dbparams = dict(
            host=settings['MYSQL_HOST'],
            db=settings['MYSQL_DBNAME'],
            user=settings['MYSQL_USER'],
            passwd=settings['MYSQL_PASSWORD'],
            charset='utf8',
            cursorclass=pymysql.cursors.DictCursor,
            use_unicode=True
        )
        dbpool = adbapi.ConnectionPool('pymysql', **dbparams)
        return cls(dbpool)
 
    def process_item(self, item, spider):
        query = self.dbpool.runInteraction(self.do_insert, item)
 
    def do_insert(self, cursor, item):
        insert_sql = """
                insert into qa_sample( 
                need_id, 
                need_question_uptime, 
                need_title, 
                need_title_describe, 
                need_answer_uptime, 
                need_answer)
                values (%s, %s, %s, %s, %s, %s)
                """
        params = (item['need_id'],
                  item['need_question_uptime'],
                  item['need_title'],
                  item['need_title_describe'],
                  item['need_answer_uptime'],
                  item['need_answer'])
        cursor.execute(insert_sql, params)