import json
import pymysql
# 读取review数据，并写入数据库
# 导入数据库成功，总共4736897条记录
def prem(db):
  cursor = db.cursor()
  cursor.execute("SELECT VERSION()")
  data = cursor.fetchone()
  print("Database version : %s " % data) # 结果表明已经连接成功
  cursor.execute("DROP TABLE IF EXISTS review") # 习惯性
  sql = """CREATE TABLE review (
       review_id VARCHAR(100),
       user_id VARCHAR(100),
       business_id VARCHAR(200),
       stars INT,
       text VARCHAR(10000) NOT NULL,
       useful INT,
       funny INT,
       cool INT)"""
  cursor.execute(sql) # 根据需要创建一个表格
def reviewdata_insert(db):
  with open('E:/data/yelp_data/dataset/review.json', encoding='utf-8') as f:
    i = 0
    while True:
      i += 1
      print(u'正在载入第%s行......' % i)
      try:
        lines = f.readline() # 使用逐行读取的方法
        review_text = json.loads(lines) # 解析每一行数据
        result = []
        result.append((review_text['review_id'], review_text['user_id'],      review_text['business_id'],review_text['stars'], review_text['text'], review_text['useful'],
              review_text['funny'], review_text['cool']))
        print(result)
        inesrt_re = "insert into review(review_id, user_id, business_id, stars, text, useful,      funny, cool) values (%s, %s, %s, %s,%s, %s,%s, %s)"
        cursor = db.cursor()
        cursor.executemany(inesrt_re, result)
        db.commit()
      except Exception as e:
        db.rollback()
        print(str(e))
        break
if __name__ == "__main__": # 起到一个初始化或者调用函数的作用
  db = pymysql.connect("localhost", "root", "password（你的密码）", "数据库名称", charset='utf8')
  cursor = db.cursor()
  prem(db)
  reviewdata_insert(db)
  cursor.close()