sql mysql数据库导库 panda pymysql

mysql数据库 导入数据

1. panda

效率超高 对内存要求高 网络稳定性

# 读取文件
ratings_names = ['user_id', 'movie_id', 'ratings', 'rating_time']
ratings = pd.read_table('/home/qjun/桌面/movielens/ratings.dat',
                       sep='::', header=None, engine='python',
                       names=ratings_names)
# 存到sql
ratings.to_sql('ratings',db, index=False, if_exists='append')

2.pymysql

import pymysql

class DB:

    def __init__(self):
        self.con = None

        self._get_con()

    def _get_con(self):
        self.con = pymysql.connect(host='localhost', port=3306,
                              database='movielens', charset='utf8',
                              user='root', password='123456')

    def insert_ratings(self,  user_id, movie_id, rating, rating_time):
        try:
            with self.con.cursor() as cursor:
                result = cursor.execute(
                    'insert into tb_ratings values (%s, %s, %s, %s)',
                    (user_id, movie_id, rating, rating_time)
                )
            if result == 1:
                print('添加成功!')
            self.con.commit()
        finally:
            print('!!!!!!'*20)
            # self.con.close()

def ratings2sql():
    with open('ratings.dat', 'r') as f:
        data, count = None, 0
        db = DB()
        while True:
            count += 1
            data = f.readline().strip()
            if not data:
                break
            data = data.split('::')
            print(data)
            db.insert_ratings(data[0], data[1], data[2], data[3])
            print(count)


if __name__ == '__main__':
    ratings2sql()