Question

我正在尝试在MySQL中使用此命令创建一个表：

CREATE TABLE tutorial_info(
     tutorial_id INT NOT_NULL AUTO_INCREMENT PRIMARY KEY,
     tutorial_title VARCHAR(100) NOT_NULL,
     tutorial_author VARCHAR(100) NOT_NULL,
     submission_date TIMESTAMP
   );

我只是将代码剪切并粘贴到终端中，但我收到错误：

您的SQL语法出错;查看与您的MySQL服务器版本相对应的手册，以便在'NOT_NULL AUTO_INCREMENT PRIMARY KEY，tutorial_title VARCHAR（100）NOT_NULL'附近使用正确的语法，在第1行

不确定这里发生了什么。有人能给我一个指针，指出我在这里做错了吗？感谢

Answer 1

将def parse_site(self, response): item = response.meta['item'] item['websites'] = response.xpath("//div[@class='company-contact-information']/table/tr/td/a/@href").extract() item['websites'] = self.remove_blacklist_links(item['websites']) # item['websites'] = ['http://www.kai-hsiang.com.tw','http://www.yangshitex.com'] print(item['websites']) time.sleep(1) for web in item['websites']: request = scrapy.Request(web, callback=self.get_emails, dont_filter=True) print(web) print(request) time.sleep(2) yield request def get_emails(self, response): # the_leads = [] item = response.meta['item'] for l in response.xpath('//a'): link = l.xpath('@href').extract()[0] print(link) ju = urlparse.urljoin(response.url, link) # the_leads.append(self.extract_email) --> Just added this now to explain what is # possible if not for the request and yield request = scrapy.Request(ju, callback=self.extract_emails, dont_filter=True, meta={'item': item}) # ---> How do i get a return value for extract_emails ? print(response.url, ju, link, "*" * 100) yield request # item['emails'] = all_leads # return item def extract_emails(self, response): item = response.meta['item'] regex = re.compile(r'([\w\-\.]{1,100}@(\w[\w\-]+\.)+[\w\-]+)') emails = list(set(regex.findall(response.body))) all_emails = [email[0].lower() for email in emails] item['emails'] = all_emails # print(item) # print("*" * 20) return item # this overrites the emails更改为NOT_NULL：

NOT NULL

Answer 2

如果没有_

，请使用not null

CREATE TABLE tutorial_info(
     tutorial_id INT NOT NULL AUTO_INCREMENT PRIMARY KEY,
     tutorial_title VARCHAR(100) NOT NULL,
     tutorial_author VARCHAR(100) NOT NULL,
     submission_date TIMESTAMP
   );

无法在MySQL中创建表

2 个答案: