scrapy中怎么进行异步插入数据库mysql

import pymysql
from twisted.enterprise import adbapi
from pymysql import cursors

class MSQLPipeline(object):

    @classmethod
    def from_setting(cls,settings):

        db_params = dict(
            host=settings['MYSQL_HOST'],
            user=settings['MYSQL_USER'],
            password=settings['MYSQL_PASSWD'],
            port=settings['MYSQL_PORT'],
            db=settings['MYSQL_DBNAME'],
            charset=settings['MYSQL_CHARSET'],
            use_unicode= True,
            cursorclass=cursors.Cursor
        )

        db_pool = adbapi.ConnectionPool('pymysql',**db_params)
        return cls(db_pool)

    def __init__(self,db_pool):
        self.db_pool = db_pool

    def process_item(self,item,spider):

        query = self.db_pool.runTnteraction(self.insert_item,item)
        query.addErrback(self.handler_error,item,spider)
        return item

    def handler_error(self,failure,item,spider):
        print(failure)


    def insert_item(self,cursor,item):

        sql = "INSERT INTO jobs(job_name,org_name,job_location,max_money,min_money,date)VALUES (%s,%s,%s,%s,%s,%s)"
        # 执行sql
        cursor.execute(sql, (
        item['job_name'], item['org_name'], item['job_location'], item['max_money'], item['min_money'], item['date']))

在pipeline中自定义一个类来实现，数据库的配置直接从settings中读取，可以通过修改settings中的配置来实现

代码的重复使用。