scrapy 返回链接的本身
时间: 2024-05-14 10:14:19 浏览: 8
Scrapy 可以通过 `response.url` 来返回链接本身,如下所示:
```python
import scrapy
class MySpider(scrapy.Spider):
name = 'example'
start_urls = ['https://www.example.com']
def parse(self, response):
# 返回链接本身
url = response.url
yield {'url': url}
```
相关问题
scrapy连接mysql
可以使用以下代码连接Scrapy和MySQL:
1. 首先,需要在Scrapy项目的settings.py文件中添加以下代码:
```
ITEM_PIPELINES = {
'myproject.pipelines.MySQLPipeline': 300,
}
MYSQL_HOST = 'localhost'
MYSQL_DBNAME = 'mydatabase'
MYSQL_USER = 'myusername'
MYSQL_PASSWORD = 'mypassword'
```
2. 然后,在Scrapy项目的pipelines.py文件中添加以下代码:
```
import pymysql
class MySQLPipeline(object):
def __init__(self, host, dbname, user, password):
self.host = host
self.dbname = dbname
self.user = user
self.password = password
@classmethod
def from_crawler(cls, crawler):
return cls(
host=crawler.settings.get('MYSQL_HOST'),
dbname=crawler.settings.get('MYSQL_DBNAME'),
user=crawler.settings.get('MYSQL_USER'),
password=crawler.settings.get('MYSQL_PASSWORD')
)
def open_spider(self, spider):
self.conn = pymysql.connect(
host=self.host,
user=self.user,
password=self.password,
db=self.dbname,
charset='utf8mb4',
cursorclass=pymysql.cursors.DictCursor
)
def close_spider(self, spider):
self.conn.close()
def process_item(self, item, spider):
with self.conn.cursor() as cursor:
sql = "INSERT INTO mytable (column1, column2, column3) VALUES (%s, %s, %s)"
cursor.execute(sql, (item['column1'], item['column2'], item['column3']))
self.conn.commit()
return item
```
3. 最后,在Scrapy项目的items.py文件中定义你的item:
```
import scrapy
class MyItem(scrapy.Item):
column1 = scrapy.Field()
column2 = scrapy.Field()
column3 = scrapy.Field()
```
这样,当你运行Scrapy爬虫时,它会将数据存储到MySQL数据库中。
scrapy连接mysql 创建表 插入字段
下面是一个使用Scrapy连接MySQL数据库、创建表和插入字段的示例代码:
```python
import scrapy
import pymysql
class MySpider(scrapy.Spider):
name = 'myspider'
def start_requests(self):
# 连接MySQL数据库
db = pymysql.connect(
host='localhost',
user='user',
password='password',
database='database'
)
# 创建表
with db.cursor() as cursor:
cursor.execute("""
CREATE TABLE IF NOT EXISTS mytable (
id INT AUTO_INCREMENT PRIMARY KEY,
title VARCHAR(255),
content TEXT
)
""")
db.commit()
# 关闭数据库连接
db.close()
# 发送请求
yield scrapy.Request(url='http://example.com', callback=self.parse)
def parse(self, response):
# 连接MySQL数据库
db = pymysql.connect(
host='localhost',
user='user',
password='password',
database='database'
)
# 插入数据
with db.cursor() as cursor:
cursor.execute("""
INSERT INTO mytable (title, content) VALUES (%s, %s)
""", (response.css('title::text').get(), response.css('body::text').get()))
db.commit()
# 关闭数据库连接
db.close()
```
在这个示例代码中,我们在`start_requests`方法中连接到MySQL数据库,并创建了一个名为`mytable`的表。然后,在`parse`方法中,我们再次连接到数据库,并插入了网页的标题和内容。
请注意,这只是一个示例代码,并且需要根据你的具体情况进行修改和定制。