Oracle Database Operations in Python practice

1. To enable Python to operate the Oracle database, first install the cx_Oracle package. You can obtain the installation package through the following address:

[Plain]

1. Http://cx-oracle.sourceforge.net/

2. You also need some class libraries of oracle. You need to install the Oracle Instant Client package on the machine running python.
[Plain]

1. Http://www.oracle.com/technetwork/database/features/instant-client/index-097480.html

Find the package that meets your platform and install it. Here I use the rpm package, so run the following command to install
[Plain]

1. $ Sudo rpm-ivh oracle-instantclient11.2-basic-11.2.0.3.0-1.i386.rpm

After installation, you need to set the environment variables as follows [plain]

1. $ Export LD_LIBRARY_PATH =$ {LD_LIBRARY_PATH}:/usr/lib/oracle/11.2/client/lib

3. Create a simple python file and test whether the installation is successful. [python]

1. ImportCx_Oracle
3. Conn = cx_Oracle.connect ('Fkong/fkong@172.17.23.129/orcl')
4. Cursor = conn. cursor ()
5. Cursor.exe cute ("Select * from dual")
6. Row = cursor. fetchone ()
7. PrintRow [0]
9. Cursor. close ()
10. Conn. close ()

4. The following describes a database table creation and insertion Operation [python].

1. ImportCx_Oracle
3. Conn = cx_Oracle.connect ('Fkong/fkong@172.17.23.129/orcl')
4. Cursor = conn. cursor ()
6. Cursor.exe cute ("Create table test (id int, COL1 VARCHAR (32), COL2 VARCHAR (32), COL3 VARCHAR (32 ))")
8. Cursor.exe cute ("Insert into test (ID, COL1, COL2, COL3) VALUES (1, 'A', 'B', 'C ')")
9. Cursor.exe cute ("Insert into test (ID, COL1, COL2, COL3) VALUES (2, 'A', 'bb ', 'cc ')")
10. Cursor.exe cute ("Insert into test (ID, COL1, COL2, COL3) VALUES (3, 'aaa', 'bbb ', 'ccc ')")
11. Conn. commit ()
13. Cursor. close ()
14. Conn. close ()

5. next let's look at the query. there are usually two ways to query: one is to use cursor. fetchall () is used to obtain all query results and then iterate over one row. fetchone () gets a record until the obtained result is null. Let's look at the example below: [python]

1. ImportCx_Oracle
3. Conn = cx_Oracle.connect ('Fkong/fkong@172.17.23.129/orcl')
4. Cursor = conn. cursor ()
6. Cursor.exe cute ("SELECT * from test")
7. Rows = cursor. fetchall ()
8. ForRowInRows:
9. Print "% D, % s"% (Row [0], Row [1], Row [2], Row [3])
11. Print "Number of rows returned: % d"% Cursor. rowcount
13. Cursor.exe cute ("SELECT * from test")
14. While(1):
15. Row = cursor. fetchone ()
16. IfRow =None:
17. Break
18. Print "% D, % s"% (Row [0], Row [1], Row [2], Row [3])
20. Print "Number of rows returned: % d"% Cursor. rowcount
22. Cursor. close ()
23. Conn. close ()