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')