1，数据库连接和关闭
1 # 引入cx_Oracle模块
2 import cx_Oracle
3
4 '''
5 方法一：用户名、密码和监听分开写
6 '''
7 db = cx_Oracle.connect('username/password@host/orcl')
8
9 '''
10 方法二：用户名、密码和监听写在一起
11 '''
12 db = cx_Oracle.connect('username','password','host/orcl')
13
14 '''
15 方法三：配置监听并连接
16 '''
17 tns = cx_Oracle.makedsn('host',1521,'orcl')
18 db = cx_Oracle.connect('username','password',tns)2，数据库增删改查操作
建立cursor并执行SQL语句：查询、更新、插入、删除，执行完成后，关闭游标，关闭数据库连接
1，数据库查询操作
1 # 导入cx_Oracle模块
2 import cx_Oracle as cx
3
4 # 连接数据库
5 db = cx.connect('username/password@host/orcl')
6
7 # 创建光标
8 cur = db.cursor()
9
10 '''
11 无需传递参数
12 '''
13 sql = '''SELECT * FROM TABLE'''
14
15 # 执行sql语句
16 cur.execute(sql)
17
18 '''
19 需要传递参数
20 '''
21
22 # 字典只有一个键值对
23 pm = {'id': 1}
24 cur.execute('SELECT * FROM TABLE WHERE ID = :id', pm)
25
26 # 字典有多个键值对
27 pa = {'id': 1, 'name': '卡卡'}
28 cur.execute('SELECT * FROM TABLE WHERE ID = :id AND NAME = :name', pa)
29
30 # 名字参数
31 cur.execute('''SELECT * FROM TABLE WHERE ID = :id''', id = 1)
32
33 cur.execute('''SELECT * FROM TABLE WHERE ID = :id AND NAME = :name''', id = 1, name = '卡卡')
34
35 # 位置参数,数据为元组，只有一个参数时，需加逗号
36 cur.execute('''SELECT * FROM TABLE WHERE ID = :a''', (1,))
37
38 cur.execute('''SELECT * FROM TABLE WHERE ID = :a AND NAME = :b''', (1, '卡卡'))
39
40 # cur.Prepare的用法,prepare之后，你再去execute的时候，就不用写上sql语句参数了
41 # 传递参数的方式与以上方式相同
42
43 cur.prepare('''SELECT * FROM TABLE WHERE ID = :id''')
44
45 # 注意，第一个参数是None
46 cur.execute(None, {'id': 1})
47
48 c_id = 1
49 c_name = "卡卡"
50
51 # %格式化字符串，%s格式化的字符串不带引号，%r格式化的字符串带单引号
52 sql = '''SELECT * FROM TABLE WHERE ID = %s''' % c_id
53
54 sql = '''SELECT * FROM TABLE WHERE ID = %s AND NAME = %r''' % (c_id, c_name)
55
56 # format格式化字符串
57 sql = '''SELECT * FROM TABLE WHERE ID = {} '''.format(c_id)
58
59 sql = '''SELECT * FROM TABLE WHERE ID = {0} AND NAME = '{1}' '''.format(c_id, c_name)
60
61 # 执行sql
62 cur.execute(sql)
63
64 '''
65 一次性返回所有的结果集(fetchall)
66 '''
67 rs = cur.fetchall()
68 print(rs)
69 for r in rs:
70 print(r)
71
72 '''
73 一次返回一行(fetchone)
74 '''
75 while(1):
76 rs = cur.fetchone()
77 if rs == None:
78 break
79 print(rs)
80
81 # 关闭光标
82 cur.close()
83
84 # 数据库断开连接
85 db.close()
2，插入、更新、删除操作后需要提交commit
1 # 导入cx_Oracle模块
2 import cx_Oracle as cx
3
4 # 连接数据库
5 db = cx.connect('username/password@host/orcl')
6
7 # 创建光标
8 cur = db.cursor()
9
10 '''
11 INSERT
12 '''
13 sql = 'INSERT INTO TABLE(ID) VALUES(1)'
14
15 '''
16 UPDATE
17 '''
18 sql = 'UPDATE TABLE SET ID = 2'
19
20 '''
21 DELETE
22 '''
23 sql = 'DELETE FROM TABLE WHERE ID = 2'
24
25 # 执行sql
26 cur.execute(sql)
27
28 # 关闭光标
29 cur.close()
30
31 # 数据库提交
32 db.commit()
33
34 # 关闭数据库
35 db.close()
来源：oschina
链接：https://my.oschina.net/u/4263721/blog/3704155