python3 pandas 读取MySQL数据和插入的实例

Python  /  管理员 发布于 7年前   152

python 代码如下：

# -*- coding:utf-8 -*-import pandas as pdimport pymysqlimport sysfrom sqlalchemy import create_enginedef read_mysql_and_insert():  try:  conn = pymysql.connect(host='localhost',user='user1',password='123456',db='test',charset='utf8') except pymysql.err.OperationalError as e:  print('Error is '+str(e))  sys.exit()   try:  engine = create_engine('mysql+pymysql://user1:123456@localhost:3306/test') except sqlalchemy.exc.OperationalError as e:  print('Error is '+str(e))  sys.exit() except sqlalchemy.exc.InternalError as e:  print('Error is '+str(e))  sys.exit()   try:   sql = 'select * from sum_case'  df = pd.read_sql(sql, con=conn)  except pymysql.err.ProgrammingError as e:  print('Error is '+str(e))  sys.exit()  print(df.head()) df.to_sql(name='sum_case_1',con=engine,if_exists='append',index=False) conn.close() print('ok') if __name__ == '__main__':  df = read_mysql_and_insert()

另外需要注意的还有。

1） test数据库里有两个表，建表语句如下：

CREATE TABLE `sum_case` (  `type_id` tinyint(2) DEFAULT NULL,  `type_name` varchar(5) DEFAULT NULL,  KEY `b` (`type_name`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8; 

CREATE TABLE `sum_case_1` (  `type_id` tinyint(2) DEFAULT NULL,  `type_name` varchar(5) DEFAULT NULL,  KEY `b` (`type_name`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8; 

插入初始数据

insert into sum_case (type_id,type_name) values (1,'a'),(2,'b'),(3,'c') 

2）创建user1用户

grant select, update,insert on test.* to 'user1'@'localhost' identified by '123456' 

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