python连接oracle数据库

首先我们要安装一下包:

cx_Oracle-5.3.tar.gz

instantclient-basic-linux.x64-12.1.0.2.0.zip

instantclient-sdk-linux.x64-12.1.0.2.0.zip

下载地址:https://www.oracle.com/technetwork/cn/database/linuxx86-64soft-095635-zhs.html

如何下载及安装,不再讲述。

验证:

[python@master ora]$ python3
Python 3.7.0 (default, Sep 15 2018, 17:37:08)
[GCC 4.8.5 20150623 (Red Hat 4.8.5-16)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import cx_Oracle

>>>

python连接oracle的方式,这里讲述两种:

(1)一个字符串完成

import cx_Oracle

#建立和数据库系统的连接
conn = cx_Oracle.connect('C##scott/tiger@192.168.1.200:1521/orcl')
#获取操作游标
cursor = conn.cursor()
#执行SQL,创建一个表
cursor.execute("""create table tb_user(id number, name varchar2(50),password varchar(50),primary key(id))""")
#关闭连接,释放资源
cursor.close()
#执行完成,打印提示信息
print ('Completed!')


(2)分开三个字符串

import cx_Oracle

#建立和数据库系统的连接
db=cx_Oracle.connect('c##scott','tiger','192.168.1.200:1521/orcl')
#获取操作游标
cursor = db.cursor()
#执行SQL,创建一个表
cursor.execute("""insert into tb_user values(1,'scott','tiger')""")
#关闭连接,释放资源
cursor.close()
#执行完成,打印提示信息
db.commit()
db.close()
print ('Completed!')

对数据库的操作:

#在Oracle插入数据
import cx_Oracle

conn = cx_Oracle.connect('C##scott/tiger@192.168.1.200:1521/orcl')
cursor = conn.cursor()

#插入一条记录
cursor.execute("""insert into tb_user values(1,'admin','password')""");

#再插入一条数据
param={'id':2,'n':'admin','p':'password'}
cursor.execute('insert into tb_user values(:id,:n,:p)',param);

#一次插入多条数据,参数为字典列表形式
param=[{'id':3,'n':'admin','p':'password'},{'id':4,'n':'admin','p':'password'},{'id':5,'n':'admin','p':'password'}];
cursor.executemany('insert into tb_user values(:id,:n,:p)',param);

#再一次插入多条数据
param=[];
#生成5条插入数据,参数为元组列表形式
for i in range(6,11):   # [6,7,8,9,10]
    param.append((i,'user'+str(i),'password'+str(i)))
#插入数据
cursor.executemany('insert into tb_user values(:1,:2,:3)',param);

cursor.close();
#提交更改
conn.commit();
conn.close();

#在Oracle中查询数据

import cx_Oracle

conn = cx_Oracle.connect('C##scott/tiger@192.168.1.200:1521/orcl')
cursor = conn.cursor()

#执行查询 语句
cursor.execute("""select * from tb_user""")

#获取一条记录
one = cursor.fetchone()
print ('1: id:%s,name:%s,password:%s'%one)

#获取两条记录!!!注意游标已经到了第二条
two = cursor.fetchmany(2)
print ('2 and 3:',two[0],two[1])

#获取其余记录!!!注意游标已经到了第四条
three = cursor.fetchall();
for row in three:
    print (row)   #打印所有结果

print ('条件查询')
cursor.prepare("""select * from tb_user where id <= :id""")
cursor.execute(None,{'id':5})
for row in cursor:  #相当于fetchall()
    print (row)

cursor.close();
conn.close();

[python@master ora]$ python3 select_ora.py
1: id:1,name:admin,password:password
2 and 3: (2, 'admin', 'password') (3, 'admin', 'password')
(4, 'admin', 'password')
(5, 'admin', 'password')
(6, 'user6', 'password6')
(7, 'user7', 'password7')
(8, 'user8', 'password8')
(9, 'user9', 'password9')
(10, 'user10', 'password10')
条件查询
(1, 'admin', 'password')
(2, 'admin', 'password')
(3, 'admin', 'password')
(4, 'admin', 'password')
(5, 'admin', 'password')

 

posted @ 2018-09-20 16:54  醉城、  阅读(2733)  评论(0编辑  收藏  举报