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python30
V2EX  ›  Python

scrapy 采集入库,下面的是入的 sqlite3 的代码,改成入库 mysql 的,下面代码需要改动吗?

  •  
  •   python30 · Jul 29, 2020 · 2292 views
    This topic created in 2125 days ago, the information mentioned may be changed or developed.

    下面是网上的一个入库 sqlite3 的,我要原样改成入库 mysql 的。 功能就是插入文章,在插入文章前需要得到文章分类的 id,如果有就根据分类名查询到分类 id, 如果没有就根据得到的资料生成分类并取得 id. 下面 sqlite3 的是可以的

    问题是 我要改成 mysql 的就不行了。具体看后面代码。

    class BookspiderPipeline(object):
    	def __init__(self):
    		DBpath = os.getcwd() + '/db.sqlite3'
    		self.con = sqlite3.connect(DBpath)
    		self.cur = self.con.cursor()
    
    	def process_item(self, item, spider):
    		self.cur.execute("SELECT id FROM books_tag WHERE tagname = ?", (item['categoryName'],))
    		tagID = self.cur.fetchone()
    		if not tagID:
    			self.cur.execute("INSERT INTO books_tag (tagname) VALUES (?)", (item['categoryName'],))
    			self.con.commit()
    			self.cur.execute("SELECT id FROM books_tag WHERE tagname = ?", (item['categoryName'],))
    			tagID = self.cur.fetchone()
    		tagID = tagID[0]
    		print(tagID)
    
    		self.cur.execute("SELECT id FROM books_book WHERE title = ?", (item['bookName'],))
    		bookID = self.cur.fetchone()
    
    		if not bookID:
    			self.cur.execute('''
    			INSERT INTO books_book (title, cover, author, intro, tag_id) VALUES (?,?,?,?,?)
    			''', (item['bookName'], item['cover'], item['author'], item['intro'], tagID))
    			self.con.commit()
    			self.cur.execute("SELECT id FROM books_book WHERE title = ?", (item['bookName'],))
    			bookID = self.cur.fetchone()
    
    		bookID = bookID[0]
    		print(bookID)
    
    		self.cur.execute('''INSERT INTO books_chapter (number, title, content, book_id) 
    						VALUES (?,?,?,?)''', (int(item['number']), item['chapterName'], item['chapterContent'], bookID))
    		self.con.commit()
    		return item
    

    我的代码:

    class ScMySqlPipeline(object):
    	def __init__(self):
    		dbargs = dict(
    			host = '127.0.0.1',
    			user = 'root',
    			passwd = 'mysqlpasswd',
    			db = 'info2222',
    			port = 3306,
    			cp_reconnect = True,
    			cursorclass = pymysql.cursors.DictCursor,
    			charset = 'utf8mb4',  
    			use_unicode = True,
    		)
    		self.dbpool = adbapi.ConnectionPool('pymysql', **dbargs)
    		
    	def process_item(self, item, spider):
            #代码执行到这里就出问题了。应该下面代码不对。
            #下面是 先判断有没有这个分类,根据分类名查询数据库,如果有就把这个分类的 id 取出来赋值给 category_id 以便于在后面插入文章时用到这个分类 id, 如果没有的话就插入这个分类然后再得到她的分类 id 值
    		conn.execute("""select id from aainfo_category where name = %s""", (item['fenlei'], ))
    		category_id = conn.fetchone()
    		if not category_id:
    			conn.execute("INSERT INTO aainfo_category (`name`, `slug`, `chaodai`, `num`, `description`, `jianjie`, `weburl`) VALUES (%s, %s, %s, %s, %s, %s, %s)", (item['category_name'], item['category_slug'], item['category_chaodai'], 0, item['category_description'], item['category_jianjie'], item['category_weburl']))
    			#conn.commit()
    			conn.execute("""select id from aainfo_category where name = %s""", (item['fenlei'], ))
    			category_id = conn.fetchone()
    			print (category_id)
    		category_id = category_id[0]
    		print (category_id)
    		if isinstance(item, vodItem):
    			query = self.dbpool.runInteraction(self.insert_into_info, item).addErrback(self.handle_error)
    			return item
    

    self.insert_into_info 这个函数是文章插入 mysql 的代码。需要用到分类的 id ,所以上面代码取得分类的 id 的功能。不知那里有错?请各位朋友指点一下。谢谢。

    3 replies    2020-08-03 12:28:30 +08:00
    ooh
        1
    ooh  
       Jul 29, 2020
    你直接把报错贴出来呗
    conn.execute("""select id from aainfo_category where name = %s""", (item['fenlei'], ))
    这个 SQL 里面字符串占位符需不需要包起来
    conn.execute("""select id from aainfo_category where name = ‘%s‘""", (item['fenlei'], ))
    ooh
        2
    ooh  
       Jul 30, 2020
    @ooh 还有你 Cursor 对象去那里了

    connection = pymysql.connect(host=MYSQL_HOST,
    user=MYSQL_USER,
    password=MYSQL_PASS,
    db=MYSQL_DB,
    charset='utf8mb4',
    cursorclass=pymysql.cursors.DictCursor)

    cursor = connection.cursor()

    // insert

    sql = 'INSERT INTO table (name) VALUES ("name")'
    cursor.execute(sql)
    connection.commit()
    // first
    sql = 'SELECT id,name FROM table'
    cursor.execute(sql)
    item = cursor.fetchone()
    python30
        3
    python30  
    OP
       Aug 3, 2020
    @ooh
    谢谢已经解决了

    执行 conn.fetchone() 后
    发现得到的数据是字典
    用 category_id = category_id['id'] 就可以得到查询的 id 了
    然后就可以用手后面的插入了

    ```
    conn.execute("""select id from scinfo_category where weburl = %s""", (category_url, ))
    category_id = conn.fetchone()
    category_id = category_id['id']

    ```
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