下載地址：

http://sourceforge.net/projects/cx-oracle/?source=directory（失效的話請(qǐng)自己百度）下載的時(shí)候注意數(shù)據(jù)庫版本和操作系統(tǒng)環(huán)境。

技術(shù)手冊(cè)：

http://starship.python.net/crew/atuining/cx_Oracle/html/cx_Oracle.html

http://cx-oracle.readthedocs.org/en/latest/index.html

cx_Oracle使用方法

自：http://www.x5dj.com/Blog/00182202/00572497.shtml

正確安裝好cx_oracle之后，要使用它來連接到oracle數(shù)據(jù)庫進(jìn)行操作，具體應(yīng)該分3步走：

第一步：導(dǎo)入cx_Oracle?，建立連接

>>> import cx_Oracle # 導(dǎo)入模塊 >>> db = cx_Oracle.connect('hr', 'hrpwd', 'localhost:1521/XE') #建立連接，3 個(gè)參數(shù)分開寫 >>> db1 = cx_Oracle.connect('hr/hrpwd@localhost:1521/XE') #建立連接，3 個(gè)參數(shù)連寫 >>> dsn_tns = cx_Oracle.makedsn('localhost', 1521, 'XE') >>> print dsn_tns (DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=localhost)(PORT=1521)))(CONNECT_DATA=(SID=XE))) >>> db2 = cx_Oracle.connect('hr', 'hrpwd', dsn_tns) >>> print db.version 10.2.0.1.0 >>> versioning = db.version.split('.') >>> print versioning ['10', '2', '0', '1', '0'] >>> if versioning[0]=='10': ... print "Running 10g" ... elif versioning[0]=='9': ... print "Running 9i" ... Running 10g >>> print db.dsn localhost:1521/XE

第二步：建立?Cursor?光標(biāo)

>>>cursor = db.cursor()
#建立一個(gè)cursor之后，我們可以調(diào)用這個(gè)cursor.execute（‘SQL‘） 來執(zhí)行SQL語句。比如： >>>cursor.execute(‘select * from tabs’) #執(zhí)行完畢以后，可以調(diào)用cursor.fetchall()一次取完所有結(jié)果，或者cursor.fetchone()一次取一行結(jié)果 >>> row=cursor.fetchall() >>> for x in row:For y in x:Print y,Print 這樣就可以按照表格的形式打印取得的結(jié)果了！ 在從oracle取出數(shù)據(jù)的時(shí)候，考慮到它的數(shù)據(jù)類型了嗎？下面就是數(shù)據(jù)類型的對(duì)應(yīng)表

Datatypes

During the fetch stage, basic Oracle data types get mapped into their Python equivalents. cx_Oracle maintains a separate set of data types that helps in this transition. The Oracle - cx_Oracle - Python mappings are:

Oracle	cx_Oracle	Python
VARCHAR2 NVARCHAR2 LONG	cx_Oracle.STRING	str
CHAR	cx_Oracle.FIXED_CHAR
NUMBER	cx_Oracle.NUMBER	int
FLOAT		float
DATE	cx_Oracle.DATETIME	datetime.datetime
TIMESTAMP	cx_Oracle.TIMESTAMP
CLOB	cx_Oracle.CLOB	cx_Oracle.LOB
BLOB	cx_Oracle.BLOB

帶參數(shù)的查詢：
>>> named_params = {'dept_id':50, 'sal':1000} >>> query1 = cursor.execute('SELECT * FROM employees WHERE department_id=:dept_id AND salary>:sal', named_params) >>> query2 = cursor.execute('SELECT * FROM employees WHERE department_id=:dept_id AND salary>:sal', dept_id=50, sal=1000)

這種是名字參數(shù)，還可以按位置參數(shù)：

r1 = cursor.execute('SELECT * FROM locations WHERE country_id=:1 AND city=:2', ('US', 'Seattle')) 注意： 當(dāng)只有一次參數(shù)的時(shí)候，也要把它寫成元組的形式，比如 Cursor.execute(‘select name from user where id=:1’,(login_Id,))

千萬要注意，login_id后面還帶有一個(gè)逗號(hào)，如果沒有逗號(hào)，他其實(shí)就是一個(gè)數(shù)據(jù)對(duì)象，但是當(dāng)他后面有個(gè)逗號(hào)的時(shí)候，他就變成了元組的一個(gè)數(shù)據(jù)項(xiàng)，千萬要記住啊，我就是在這里徘徊了很久。！

Cursor. Prepare的用法， 這個(gè)方法就是在prepare之后，你再去execute的時(shí)候，就不用寫上sql語句參數(shù)了 >>> cursor.prepare('SELECT * FROM jobs WHERE min_salary>:min') >>> r = cursor.execute(None, {'min':1000}) #注意，第一個(gè)參數(shù)是None 一次執(zhí)行多條sql語句： Large insert operations don't require many separate inserts because Python fully supports inserting many rows at once with the cx_Oracle.Cursor.executemany method. Limiting the number of execute operations improves program performance a lot and should be the first thing to think about when writing applications heavy on INSERTs. Let's create a table for a Python module list, this time directly from Python. You will drop it later. >>> create_table = """ CREATE TABLE python_modules ( module_name VARCHAR2(50) NOT NULL, file_path VARCHAR2(300) NOT NULL ) """ >>> from sys import modules >>> cursor.execute(create_table) >>> M = [] >>> for m_name, m_info in modules.items(): ... try: ... M.append((m_name, m_info.__file__)) ... except AttributeError: ... pass ... >>> len(M) 76 >>> cursor.prepare("INSERT INTO python_modules(module_name, file_path) VALUES (:1, :2)") >>> cursor.executemany(None, M) >>> db.commit() >>> r = cursor.execute("SELECT COUNT(*) FROM python_modules") >>> print cursor.fetchone() (76,) >>> cursor.execute("DROP TABLE python_modules PURGE")

?BLOB & CLOB 格式的創(chuàng)建:

binary_content = cursor.var(cx_Oracle.BLOB)
binary_content.setvalue(0, content)

轉(zhuǎn)載于:https://www.cnblogs.com/zijin/archive/2013/03/25/2980906.html

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