python3 pandas 读取MySQL数据和插入的实例
python 代码如下：
# -*- coding:utf-8 -*-
import pandas as pd
import pymysql
import sys
from sqlalchemy import create_engine
def 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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