ABCD访问Oracle之旅(abcd访问oracle)
ABCD访问Oracle之旅
在现代信息技术的时代,面向企业数据和信息的存储和管理成为了企业信息化建设的核心任务之一。Oracle是目前市场占有率最高的企业级数据库,很多企业的数据都存储在Oracle数据库中。本文将介绍如何使用Python来访问Oracle,并对ABCD提供具体实现方案。
一、Oracle数据库连接方式
Python连接Oracle数据库有多种方式,常用的使用cx_Oracle或sqlalchemy包进行连接。
1. cx_Oracle连接Oracle数据库
(1)安装cx_Oracle包
pip install cx_Oracle
(2)连接Oracle数据库
import cx_Oracle
conn = cx_Oracle.connect(‘username/password@127.0.0.1:1521/xe’)
print(conn.version)
#打印Oracle数据库的版本信息
2. sqlalchemy连接Oracle数据库
(1)安装sqlalchemy包
pip install sqlalchemy
(2)连接Oracle数据库
from sqlalchemy import create_engine
engine = create_engine(‘oracle://username:password@127.0.0.1:1521/xe’)
conn = engine.connect()
二、ABCD访问Oracle数据库示例
1. 查询表
(1)使用cx_Oracle查询表
import cx_Oracle
conn = cx_Oracle.connect(‘username/password@127.0.0.1:1521/xe’)
cursor = conn.cursor()
cursor.execute(‘select * from employee’)
rows = cursor.fetchall()
for row in rows:
print(row)
(2)使用sqlalchemy查询表
from sqlalchemy import create_engine
engine = create_engine(‘oracle://username:password@127.0.0.1:1521/xe’)
conn = engine.connect()
result = conn.execute(‘select * from employee’)
for row in result:
print(row)
2. 插入记录
(1)使用cx_Oracle插入记录
import cx_Oracle
conn = cx_Oracle.connect(‘username/password@127.0.0.1:1521/xe’)
cursor = conn.cursor()
sql = “INSERT INTO employee(id, name, age) VALUES (:1, :2, :3)”
data = [(1, ‘Alice’, 30), (2, ‘Bob’, 35), (3, ‘Charlie’, 40)]
cursor.executemany(sql, data)
conn.commit()
(2)使用sqlalchemy插入记录
from sqlalchemy import create_engine
engine = create_engine(‘oracle://username:password@127.0.0.1:1521/xe’)
conn = engine.connect()
sql = “INSERT INTO employee(id, name, age) VALUES (:id, :name, :age)”
data = [{“id”: 1, “name”: “Alice”, “age”: 30}, \
{“id”: 2, “name”: “Bob”, “age”: 35}, \
{“id”: 3, “name”: “Charlie”, “age”: 40}]
conn.execute(sql, data)
3. 更新记录
(1)使用cx_Oracle更新记录
import cx_Oracle
conn = cx_Oracle.connect(‘username/password@127.0.0.1:1521/xe’)
cursor = conn.cursor()
cursor.execute(“UPDATE employee SET age = 31 WHERE name = ‘Alice'”)
conn.commit()
(2)使用sqlalchemy更新记录
from sqlalchemy import create_engine
engine = create_engine(‘oracle://username:password@127.0.0.1:1521/xe’)
conn = engine.connect()
sql = “UPDATE employee SET age = :age WHERE name = :name”
data = {“name”: “Alice”, “age”: 31}
conn.execute(sql, data)
4. 删除记录
(1)使用cx_Oracle删除记录
import cx_Oracle
conn = cx_Oracle.connect(‘username/password@127.0.0.1:1521/xe’)
cursor = conn.cursor()
cursor.execute(“DELETE FROM employee WHERE name = ‘Charlie'”)
conn.commit()
(2)使用sqlalchemy删除记录
from sqlalchemy import create_engine
engine = create_engine(‘oracle://username:password@127.0.0.1:1521/xe’)
conn = engine.connect()
sql = “DELETE FROM employee WHERE name = :name”
data = {“name”: “Charlie”}
conn.execute(sql, data)
三、总结
本文介绍了Python访问Oracle数据库的两种常用方式,并给出了ABCD访问Oracle数据库的示例。通过学习本文内容,读者可以掌握如何使用Python来访问Oracle数据库,帮助企业更好地管理和利用企业数据。