cx_Oracle模块
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
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- 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
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- 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
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- $ 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
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- $ export LD_LIBRARY_PATH=${LD_LIBRARY_PATH}:/usr/lib/oracle/11.2/client/lib
3. 创建一个简单的python文件,测试安装是否成功
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- 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
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- 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:
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- 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 ()