摘要：準(zhǔn)備工作運(yùn)行本地?cái)?shù)據(jù)庫(kù)服務(wù)器安裝建表連接數(shù)據(jù)庫(kù)用操作還是比較簡(jiǎn)單的，如果有一點(diǎn)數(shù)據(jù)庫(kù)基礎(chǔ)的話，可以直接上手，最后一定不要忘了寫提交，不然數(shù)據(jù)只是緩存，存不到數(shù)據(jù)庫(kù)里完整示例爬取百度上最熱的幾個(gè)新聞標(biāo)題，并存儲(chǔ)到數(shù)據(jù)庫(kù)，太懶了沒(méi)寫注釋

運(yùn)行本地?cái)?shù)據(jù)庫(kù)服務(wù)器

    mysql -u root -p

安裝pymysql

    pip install pymysql

CREATE DATABASE crawls;
// show databases; 
use db;

CREATE TABLE IF NOT EXISTS baiduNews("
       "id INT PRIMARY KEY NOT NULL AUTO_INCREMENT,"
       "ranking VARCHAR(30),"
       "title VARCHAR(60),"
       "datetime TIMESTAMP,"
       "hot VARCHAR(30));
// show tables;

db = pymysql.connect(host="localhost", port=3306, user="root", passwd="123456", 
                    db="crawls", charset="utf8")
cursor = db.cursor()
cursor.execute(sql_query)
db.commit()

用python操作mysql還是比較簡(jiǎn)單的，如果有一點(diǎn)數(shù)據(jù)庫(kù)基礎(chǔ)的話，可以直接上手，最后一定不要忘了寫commit提交，不然數(shù)據(jù)只是緩存，存不到數(shù)據(jù)庫(kù)里

爬取百度上最熱的幾個(gè)新聞標(biāo)題，并存儲(chǔ)到數(shù)據(jù)庫(kù)，太懶了沒(méi)寫注釋-_- (確保本地mysql服務(wù)器已經(jīng)打開）

"""
Get the hottest news title on baidu page,
then save these data into mysql
"""
import datetime

import pymysql
from pyquery import PyQuery as pq
import requests
from requests.exceptions import ConnectionError

URL = "https://www.baidu.com/s?wd=%E7%83%AD%E7%82%B9"
headers = {
    "User-Agent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.77 Safari/537.36",
    "Upgrade-Insecure-Requests": "1"
}

def get_html(url):
    try:
        response = requests.get(url, headers=headers)
        if response.status_code == 200:
            return response.text
        return None
    except ConnectionError as e:
        print(e.args)
        return None

def parse_html(html):
    doc = pq(html)
    trs = doc(".FYB_RD table.c-table tr").items()
    for tr in trs:
        index = tr("td:nth-child(1) span.c-index").text()
        title = tr("td:nth-child(1) span a").text()
        hot = tr("td:nth-child(2)").text().strip(""")
        yield {
            "index":index,
            "title":title,
            "hot":hot
        }

def save_to_mysql(items):
    try:
        db = pymysql.connect(host="localhost", port=3306, user="root", passwd="123456",
                             db="crawls", charset="utf8")
        cursor = db.cursor()
        cursor.execute("use crawls;")
        cursor.execute("CREATE TABLE IF NOT EXISTS baiduNews("
                       "id INT PRIMARY KEY NOT NULL AUTO_INCREMENT,"
                       "ranking VARCHAR(30),"
                       "title VARCHAR(60),"
                       "datetime TIMESTAMP,"
                       "hot VARCHAR(30));")
        try:
            for item in items:
                print(item)
                now = datetime.datetime.now()
                now = now.strftime("%Y-%m-%d %H:%M:%S")
                sql_query = "INSERT INTO baiduNews(ranking, title, datetime, hot) VALUES ("%s", "%s", "%s", "%s")" % (
                            item["index"], item["title"], now, item["hot"])
                cursor.execute(sql_query)
                print("Save into mysql")
            db.commit()
        except pymysql.MySQLError as e:
            db.rollback()
            print(e.args)
            return
    except pymysql.MySQLError as e:
        print(e.args)
        return

def check_mysql():
    try:
        db = pymysql.connect(host="localhost", port=3306, user="root", passwd="123456",
                             db="crawls", charset="utf8")
        cursor = db.cursor()
        cursor.execute("use crawls;")
        sql_query = "SELECT * FROM baiduNews"
        results = cursor.execute(sql_query)
        print(results)
    except pymysql.MySQLError as e:
        print(e.args)

def main():
    html = get_html(URL)
    items = parse_html(html)
    save_to_mysql(items)
    #check_mysql()

if __name__ == "__main__":
    main()