Scrapy学习-7-数据存储至数据库

使用MySQL数据库存储

安装mysql模块包

pip install mysqlclient

相关库文件

sudo apt-get install libmysqlclient-devel
 
sudo apt-get install python-devel mysql-devel

阻塞型的数据写入操作

class MysqlPipeline(object):
 
    def __init__(self):
        self.conn = pymysql.connect('192.168.1.1', 'root', '', 'titlespider',
                                    charset='utf-8', use_unicode=True)
        self.cursor = self.conn.cursor()
 
    def process_item(self, item, spider):
        insert_sql = """
            insert into article(title, cteate_time, url, content)
            VALUES (%s, %s, %s, %s)
        """
        self.cursor.execute(insert_sql, (item['title'], item['cteate_time'], item['url'], item['content']))
        self.conn.commit()
        return item

使用twisted提供的数据库连接池，异步化写入，缓解写数据操作堵塞

# 首先在settings定义数据库关键字变量
 
    MYSQL_HOST = '192.168.1.1'
    MYSQL_USER = 'root'
    MYSQL_PASSWD = ''
    MYSQL_DB = 'articlespider'
 
# 然后编写Pipeline类
 
    from twisted.enterprise import adbapi
    import pymysql
    import pymysql.cursors      
 
    class MysqlTwistedPipeline(object):
 
        def __init__(self, dbpool):
            self.dbpool = dbpool
 
        @classmethod
        def from_settings(cls, settings):
            conn_dict = dict(
                host = settings['MYSQL_HOST'],
                user = settings['MYSQL_USER'],
                passwd = settings['MYSQL_PASSWD'],
                database = settings['MYSQL_DB'],
                charset = 'utf-8',
                cursorclass = pymysql.cursors.DictCursor,
                use_unicode = True
            )
            dbpool = adbapi.ConnectionPool('PyMySQL', **conn_dict)
            return cls(dbpool)
 
        def process_item(self, item, spider):
            query = self.dbpool.runInteraction(self.do_insert, item)
            query.addErrorback(self.handle_error)
            return item
 
        def do_insert(self, item):
            insert_sql = """
                        insert into article(title, cteate_time, url, content)
                        VALUES (%s, %s, %s, %s)
                    """
            self.cursor.execute(insert_sql, (item['title'], item['cteate_time'], item['url'], item['content']))
            self.conn.commit()
 
        def handle_error(self, failure):
            print(failure)

使用类似django-model的方式写入数据库

https://github.com/scrapy-plugins/scrapy-djangoitem