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【Python学习笔记】Python数据库连接大法

  • 2026-02-06 20:06:36
【Python学习笔记】Python数据库连接大法

前言

    大家好!今天我们来聊聊Python连接数据库的那些事儿。无论是数据分析师、开发工程师还是数据科学家,掌握Python连接数据库的技能都是必备的。让我们一起探索如何用Python优雅地连接各种数据库,并高效地读取数据!

为什么选择Python连接数据库?

    想象一下这些场景:

  • 公司数据分散在MySQL、PostgreSQL、SQL Server等不同数据库中

  • 需要从多个数据源整合数据进行分析

  • 开发需要频繁查询和测试数据库

  • 做数据迁移或同步工作

    如果每次都手动操作,不仅效率低下,还容易出错。而掌握了Python数据库连接技术,这些问题都能轻松解决!

1. 准备工作:安装必要的库

    在开始之前,我们先安装一些基础库:

# 基础必备pip install pandas sqlalchemy# 根据需要选择数据库驱动pip install mysqlclient      # MySQLpip install psycopg2         # PostgreSQLpip install pyodbc           # SQL Serverpip install cx_Oracle        # Oracle

2. 各种数据库连接实战

2.1 MySQL:最常用的关系型数据库

from sqlalchemy import create_engineimport pandas as pd# 连接MySQLengine = create_engine('mysql+pymysql://用户名:密码@主机:3306/数据库名')# 查询数据query = "SELECT * FROM users WHERE age > 25"df = pd.read_sql(query, engine)# 看看前5行数据print(df.head())

2.2 PostgreSQL:强大的开源数据库

# 连接PostgreSQLengine = create_engine('postgresql://用户名:密码@主机:5432/数据库名')# 复杂查询query = """SELECT     u.name,    u.email,    COUNT(o.id) as order_countFROM users uLEFT JOIN orders o ON u.id = o.user_idWHERE u.active = TRUEGROUP BY u.id, u.name, u.emailHAVING COUNT(o.id) > 5"""df = pd.read_sql(query, engine)

2.3 SQL Server:企业级数据库

# 连接SQL Serverengine = create_engine('mssql+pymssql://用户名:密码@主机:端口/数据库名?charset=GBK')df = pd.read_sql("SELECT * FROM employees", engine)

2.4 Oracle:关系型数据库

# 连接Oracle# 连接字符串格式:oracle://用户名:密码@主机:端口/服务名engine = create_engine('oracle://用户名:密码@主机:端口/服务名')# 查询数据df = pd.read_sql("SELECT * FROM employees", engine)

3.使用INI文件管理数据库配置(重点!)

    在实际项目中,我们不应该在代码中硬编码数据库密码。最好的做法是使用配置文件!

3.1 创建配置文件

    创建一个名为config.ini的文件:

; config.ini; 数据库配置[mysql_prod]host = 192.168.1.100port = 3306database = company_dbusername = read_userpassword = secure_password_123[mysql_dev]host = localhostport = 3306database = dev_dbusername = dev_userpassword = dev_password[postgres_analytics]host = analytics.example.comport = 5432database = analytics_dbusername = analystpassword = analyst_pass[redis_cache]host = 127.0.0.1port = 6379password = redis_pass

3.2 Python读取INI配置

import configparserimport osfrom sqlalchemy import create_engineimport pandas as pdclass DatabaseManager:"""数据库连接管理器"""    def __init__(self, config_file='config.ini'):        self.config = configparser.ConfigParser()# 读取配置文件if not os.path.exists(config_file):            raise FileNotFoundError(f"配置文件不存在: {config_file}")        self.config.read(config_file, encoding='utf-8')# 缓存引擎连接        self.engines = {}    def get_engine(self, section):"""获取数据库引擎"""if section not in self.engines:if not self.config.has_section(section):                raise ValueError(f"配置文件中没有 [{section}] 节")# 构建连接字符串if section.startswith('mysql'):                conn_str = (                    f"mysql://{self.config[section]['username']}:"                    f"{self.config[section]['password']}@"                    f"{self.config[section]['host']}:"                    f"{self.config[section]['port']}/"                    f"{self.config[section]['database']}"                )elif section.startswith('postgres'):                conn_str = (                    f"postgresql://{self.config[section]['username']}:"                    f"{self.config[section]['password']}@"                    f"{self.config[section]['host']}:"                    f"{self.config[section]['port']}/"                    f"{self.config[section]['database']}"                )else:                raise ValueError(f"不支持的数据库类型: {section}")# 创建引擎            self.engines[section] = create_engine(conn_str)return self.engines[section]    def query(self, section, sql, params=None):"""执行查询"""        engine = self.get_engine(section)return pd.read_sql(sql, engine, params=params)    def close_all(self):"""关闭所有连接"""for engine in self.engines.values():            engine.dispose()# 使用示例db_manager = DatabaseManager()# 从生产数据库查询prod_data = db_manager.query('mysql_prod'"SELECT * FROM sales WHERE date >= '2024-01-01'")# 从分析数据库查询analytics_data = db_manager.query('postgres_analytics',"SELECT * FROM user_behavior")print(f"生产数据行数: {len(prod_data)}")print(f"分析数据行数: {len(analytics_data)}")

4.安全注意事项

    虽然INI文件很方便,但安全同样重要:

  • 绝对不要提交包含真实密码的INI文件到Git
  • 创建.gitignore文件,忽略配置文件:
# 忽略配置文件config.ini*.ini# 但保留示例文件!config.example.ini

结语

    掌握了Python连接各种数据库的技能,你就拥有了数据世界的"万能钥匙"。无论是简单的数据查询,还是复杂的数据整合分析,都能游刃有余。

    记住:技术不在于复杂,而在于实用。选择最适合你当前需求的技术方案,并不断优化迭代。

    希望这篇文章能帮助你在数据处理的路上更进一步!如果有任何问题,欢迎在评论区留言讨论。

代码改变世界,数据驱动未来! 🚀

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  1. CONNECT:[ UseTime:0.000515s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000785s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000472s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000344s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000504s ]
  6. SELECT * FROM `set` [ RunTime:0.000219s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000576s ]
  8. SELECT * FROM `article` WHERE `id` = 463787 LIMIT 1 [ RunTime:0.000402s ]
  9. UPDATE `article` SET `lasttime` = 1770486125 WHERE `id` = 463787 [ RunTime:0.017739s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000287s ]
  11. SELECT * FROM `article` WHERE `id` < 463787 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000554s ]
  12. SELECT * FROM `article` WHERE `id` > 463787 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000402s ]
  13. SELECT * FROM `article` WHERE `id` < 463787 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000672s ]
  14. SELECT * FROM `article` WHERE `id` < 463787 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.006985s ]
  15. SELECT * FROM `article` WHERE `id` < 463787 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.006954s ]
0.105028s