本文实例讲述了Python编程实战之Oracle数据库操作。分享给大家供大家参考,具体如下:
1. 要想使Python可以操作Oracle数据库,首先需要安装cx_Oracle包,可以通过下面的地址来获取安装包
http://cx-oracle.sourceforge.net/
2. 另外还需要oracle的一些类库,此时需要在运行python的机器上安装Oracle Instant Client软件包,可以通过下面地址获得
http://www.oracle.com/technetwork/database/features/instant-client/index-097480.html
找到符合自己平台的包,然后安装,这里我使用的是rpm包,所以使用以下命令安装
1
|
$ sudo rpm -ivh oracle-instantclient11.2-basic-11.2.0.3.0-1.i386.rpm |
装完毕后还需要设置一下环境变量,如下
3. 创建一个简单的python文件,测试安装是否成功
1
2
3
4
5
6
7
8
|
import cx_Oracle conn = cx_Oracle.connect( 'fkong/fkong@172.17.23.129/orcl' ) cursor = conn.cursor () cursor.execute ( "select * from dual" ) row = cursor.fetchone () print row[ 0 ] cursor.close () conn.close () |
4. 下面看一个数据库建表和插入操作
1
2
3
4
5
6
7
8
9
10
|
import cx_Oracle conn = cx_Oracle.connect( 'fkong/fkong@172.17.23.129/orcl' ) cursor = conn.cursor () cursor.execute ( "CREATE TABLE TEST(ID INT, COL1 VARCHAR(32), COL2 VARCHAR(32), COL3 VARCHAR(32))" ) cursor.execute ( "INSERT INTO TEST (ID, COL1, COL2, COL3)VALUES(1, 'a', 'b', 'c')" ) cursor.execute ( "INSERT INTO TEST (ID, COL1, COL2, COL3)VALUES(2, 'aa', 'bb', 'cc')" ) cursor.execute ( "INSERT INTO TEST (ID, COL1, COL2, COL3)VALUES(3, 'aaa', 'bbb', 'ccc')" ) conn.commit() cursor.close () conn.close () |
5. 下面再来看看查询,查询通常有两种方式:一种是使用cursor.fetchall()获取所有查询结果,然后再一行一行的迭代;另一种每次通过cursor.fetchone()获取一条记录,直到获取的结果为空为止。看一下下面的例子:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
|
import cx_Oracle conn = cx_Oracle.connect( 'fkong/fkong@172.17.23.129/orcl' ) cursor = conn.cursor () cursor.execute ( "SELECT * FROM TEST" ) rows = cursor.fetchall() for row in rows: print "%d, %s, %s, %s" % (row[ 0 ], row[ 1 ], row[ 2 ], row[ 3 ]) print "Number of rows returned: %d" % cursor.rowcount cursor.execute ( "SELECT * FROM TEST" ) while ( 1 ): row = cursor.fetchone() if row = = None : break print "%d, %s, %s, %s" % (row[ 0 ], row[ 1 ], row[ 2 ], row[ 3 ]) print "Number of rows returned: %d" % cursor.rowcount cursor.close () conn.close () |
希望本文所述对大家Python程序设计有所帮助。