【Oracle】python连接Oracle数据库

python连接Oracle数据库

查看Oracle版本

select * from v$version

下载对应版本的InstantClient

下载网址

安装oracle client

Windows

InstantClient

1.解压InstantClient

2.环境变量

3.将其解压目录下的oci.dll、oraocieixx.dll、oraoccixx.dll文件复制到python安装目录的Lib/site-packages文件夹下

Linux

当前环境

cat /etc/redhat-release 

安装对应的rpm oracle client

rpm -ivh oracle-instantclient12.1-basic-12.1.0.2.0-1.x86_64.rpm

配置环境变量

vi /root/.bash_profile

# .bash_profile
# Get the aliases and functions
if [ -f ~/.bashrc ]; then
        . ~/.bashrc
fi
# User specific environment and startup programs
PATH=$PATH:$HOME/bin
export ORACLE_HOME=/usr/lib/oracle/12.1/client64/lib
export LD_LIBRARY_PATH=$LD_LIBARARY_PATH:$ORACLE_HOME
export PATH

source /root/.bash_profile

安装cx_Oracle驱动包

pip install cx_Oracle

Python与Oracle交互操作

#连接
import cx_Oracle
db = cx_Oracle.connect("scott","a123456","192.168.2.1:1521/orcl")

#配置监听并连接
import cx_Oracle
moniter = cx_Oracle.makedsn('192.168.2.1',1521,'orcl')
db = cx_Oracle.connect('scott','a123456',moniter)

查询一条记录

import cx_Oracle
# 注意：一定要加下面这两行代码，负责会中文乱码；
import os
os.environ['NLS_LANG'] = 'SIMPLIFIED CHINESE_CHINA.UTF8'

db = cx_Oracle.connect("scott","a123456","192.168.2.1:1521/orcl")
cursor = db.cursor()

cursor.execute('select count(*) from emp1')
aa = cursor.fetchone()
print(aa)
cursor.execute('select ename,deptno,sal from emp1')     
for i in range(aa[0]):
    a,b,c = cursor.fetchone()
    d = "我的名字叫{}，所在部门是{}，工资是{}美元".format(a,b,c)
    display(d)
db.close()

获取所有记录

import cx_Oracle
# 注意：一定要加下面这两行代码，负责会中文乱码；
import os
os.environ['NLS_LANG'] = 'SIMPLIFIED CHINESE_CHINA.UTF8'

db = cx_Oracle.connect("scott","a123456","192.168.2.1:1521/orcl")
cursor = db.cursor()

cursor.execute('select ename,deptno,sal from emp1')    
aa = cursor.fetchall()
# print(aa)
for a,b,c in aa:
    d = "我的名字叫{}，所在部门是{}，工资是{}美元".format(a,b,c)
    display(d)
db.close()

转换为DataFrame

import cx_Oracle
import pandas as pd
import os
os.environ['NLS_LANG'] = 'SIMPLIFIED CHINESE_CHINA.UTF8'

db = cx_Oracle.connect("scott","a123456","192.168.2.1:1521/orcl")
cursor = db.cursor()

df1 = pd.read_sql("select * from emp where deptno=20",db)
display(df1)

df2 = pd.read_sql("select * from emp where deptno=30",db)
display(df2)

解决中文乱码问题

方法一
C:\Users\AA>set nls_lang=SIMPLIFIED CHINESE_CHINA.ZHS16GBK

方法二
import os
os.environ['NLS_LANG'] = 'SIMPLIFIED CHINESE_CHINA.UTF8'

参考

• https://blog.csdn.net/qq_40907977/article/details/107906057