配置python连接oracle读取excel数据写入数据库的操作流程

import cx_Oracle
import os

# 设置环境编码方式，可解决读取数据库中文乱码问题
os.environ['NLS_LANG'] = 'SIMPLIFIED CHINESE_CHINA.UTF8'

# 用户名/密码@IP:端口/实例名
conn = cx_Oracle.connect('kplin/12sss3456@192.168.124.102:1521/ORCL')

cursor = conn.cursor()

try:
  sql = 'select * from emp'
  cursor.execute(sql)
  ret = cursor.fetchall()
  print(ret)
  # cursor.commit()
except Exception as e:
  print(e)
finally:
  cursor.close()

pip install pandas==1.1.4
pip install sqlalchemy

#!/usr/bin/env python
# -*- coding:utf-8 -*-
# date: 2021/3/14
# filename: excel_to_db
# author: kplin


import pandas as pd
from sqlalchemy import create_engine
from sqlalchemy import types


# conn_string='oracle+cx_oracle://user:pass@host:port/dbname'
conn_string='oracle+cx_oracle://KPLIN:654321@192.168.124.6:1521/ORCL'
engine = create_engine(conn_string, echo=False)

df = pd.read_excel('test.xlsx')
# if_exists有三个可选值，'fail'：如果存在该表则报错，'append'：如果存在该表则将数据追加到列尾，'replace'：如果存在该表则替换
# df.to_sql('test', con=engine, if_exists='replace')

# 按上面这种写入方式name字段将被写成clob字段类型，
# 如果我们希望把name改为varchar2类型，怎么做？
# 我们可以利用sqlalchemy的types把name指定为varchar2()类型
len = df.name.str.len().max()
df.to_sql('test', engine, if_exists='replace', dtype={'name': types.VARCHAR(len)})

rows = engine.execute("SELECT * FROM TEST").fetchall()

print(rows)