{"id":1125320,"date":"2025-01-08T19:50:53","date_gmt":"2025-01-08T11:50:53","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/1125320.html"},"modified":"2025-01-08T19:50:55","modified_gmt":"2025-01-08T11:50:55","slug":"python%e5%a6%82%e4%bd%95%e6%9b%b4%e6%96%b0%e6%95%b0%e6%8d%ae%e5%ba%93%e6%95%b0%e6%8d%ae%e5%ba%93%e6%95%b0%e6%8d%ae","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/1125320.html","title":{"rendered":"python\u5982\u4f55\u66f4\u65b0\u6570\u636e\u5e93\u6570\u636e\u5e93\u6570\u636e"},"content":{"rendered":"

\"python\u5982\u4f55\u66f4\u65b0\u6570\u636e\u5e93\u6570\u636e\u5e93\u6570\u636e\"<\/p>\n

Python \u5982\u4f55\u66f4\u65b0\u6570\u636e\u5e93\u6570\u636e<\/strong><\/p>\n<\/p>\n

Python \u66f4\u65b0\u6570\u636e\u5e93\u6570\u636e\u7684\u6b65\u9aa4\u5305\u62ec\uff1a\u9009\u62e9\u5408\u9002\u7684\u6570\u636e\u5e93\u5e93\u3001\u5efa\u7acb\u6570\u636e\u5e93\u8fde\u63a5\u3001\u7f16\u5199 SQL \u66f4\u65b0\u8bed\u53e5\u3001\u6267\u884c\u66f4\u65b0\u64cd\u4f5c\u3001\u5904\u7406\u9519\u8bef\u548c\u63d0\u4ea4\u4e8b\u52a1\u3002<\/strong> \u5728\u8fd9\u4e9b\u6b65\u9aa4\u4e2d\uff0c\u9009\u62e9\u5408\u9002\u7684\u6570\u636e\u5e93\u5e93\u662f\u6700\u5173\u952e\u7684\u4e00\u6b65\uff0c\u56e0\u4e3a\u4e0d\u540c\u7684\u6570\u636e\u5e93\u5e93\u63d0\u4f9b\u4e86\u4e0d\u540c\u7684\u529f\u80fd\u548c\u6027\u80fd\u3002\u672c\u6587\u5c06\u8be6\u7ec6\u4ecb\u7ecd\u6bcf\u4e2a\u6b65\u9aa4\uff0c\u5e76\u91cd\u70b9\u63a2\u8ba8\u5982\u4f55\u9009\u62e9\u5408\u9002\u7684\u6570\u636e\u5e93\u5e93\u6765\u4f18\u5316\u66f4\u65b0\u64cd\u4f5c\u3002<\/p>\n<\/p>\n

\n

\u4e00\u3001\u9009\u62e9\u5408\u9002\u7684\u6570\u636e\u5e93\u5e93<\/h3>\n<\/p>\n

\u5728\u4f7f\u7528 Python \u66f4\u65b0\u6570\u636e\u5e93\u65f6\uff0c\u9009\u62e9\u5408\u9002\u7684\u6570\u636e\u5e93\u5e93\u975e\u5e38\u91cd\u8981\u3002\u5e38\u7528\u7684\u6570\u636e\u5e93\u5e93\u6709 MySQL\u3001PostgreSQL\u3001SQLite \u548c SQLAlchemy \u7b49\u3002\u6bcf\u4e2a\u5e93\u90fd\u6709\u5176\u72ec\u7279\u7684\u529f\u80fd\u548c\u9002\u7528\u573a\u666f\u3002<\/p>\n<\/p>\n

1. MySQL<\/h4>\n<\/p>\n

MySQL \u662f\u4e00\u4e2a\u5e7f\u6cdb\u4f7f\u7528\u7684\u5f00\u6e90\u5173\u7cfb\u578b\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\u3002\u5b83\u4ee5\u5176\u9ad8\u6027\u80fd\u3001\u53ef\u9760\u6027\u548c\u6613\u7528\u6027\u8457\u79f0\u3002\u5728 Python \u4e2d\uff0cmysql-connector-python<\/code> \u548c PyMySQL<\/code> \u662f\u5e38\u7528\u7684 MySQL \u9a71\u52a8\u7a0b\u5e8f\u3002<\/p>\n<\/p>\n

import mysql.connector<\/p>\n
\u5efa\u7acb\u8fde\u63a5<\/strong><\/h2>\n
conn = mysql.connector.connect(<\/p>\n
    host="localhost",<\/p>\n
    user="yourusername",<\/p>\n
    password="yourpassword",<\/p>\n
    database="yourdatabase"<\/p>\n
)<\/p>\n
cursor = conn.cursor()<\/p>\n
\u66f4\u65b0\u6570\u636e<\/strong><\/h2>\n
update_query = "UPDATE yourtable SET column1 = %s WHERE column2 = %s"<\/p>\n
data = ("new_value", "condition_value")<\/p>\n
cursor.execute(update_query, data)<\/p>\n
\u63d0\u4ea4\u4e8b\u52a1<\/strong><\/h2>\n
conn.commit()<\/p>\n
\u5173\u95ed\u8fde\u63a5<\/strong><\/h2>\n
cursor.close()<\/p>\n
conn.close()<\/p>\n
<\/code><\/pre>\n<\/p>\n
2. PostgreSQL<\/h4>\n<\/p>\n
PostgreSQL \u662f\u4e00\u4e2a\u529f\u80fd\u5f3a\u5927\u7684\u5f00\u6e90\u5bf9\u8c61\u5173\u7cfb\u6570\u636e\u5e93\u7cfb\u7edf\u3002\u5b83\u5177\u6709\u8f83\u9ad8\u7684\u6269\u5c55\u6027\u548c\u7b26\u5408\u6807\u51c6\u7684 SQL \u8bed\u6cd5\u3002\u5728 Python \u4e2d\uff0cpsycopg2<\/code> \u662f\u5e38\u7528\u7684 PostgreSQL \u9a71\u52a8\u7a0b\u5e8f\u3002<\/p>\n<\/p>\n
import psycopg2<\/p>\n
\u5efa\u7acb\u8fde\u63a5<\/strong><\/h2>\n
conn = psycopg2.connect(<\/p>\n
    host="localhost",<\/p>\n
    user="yourusername",<\/p>\n
    password="yourpassword",<\/p>\n
    dbname="yourdatabase"<\/p>\n
)<\/p>\n
cursor = conn.cursor()<\/p>\n
\u66f4\u65b0\u6570\u636e<\/strong><\/h2>\n
update_query = "UPDATE yourtable SET column1 = %s WHERE column2 = %s"<\/p>\n
data = ("new_value", "condition_value")<\/p>\n
cursor.execute(update_query, data)<\/p>\n
\u63d0\u4ea4\u4e8b\u52a1<\/strong><\/h2>\n
conn.commit()<\/p>\n
\u5173\u95ed\u8fde\u63a5<\/strong><\/h2>\n
cursor.close()<\/p>\n
conn.close()<\/p>\n
<\/code><\/pre>\n<\/p>\n
3. SQLite<\/h4>\n<\/p>\n
SQLite \u662f\u4e00\u4e2a\u8f7b\u91cf\u7ea7\u7684\u5d4c\u5165\u5f0f\u5173\u7cfb\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\uff0c\u9002\u7528\u4e8e\u5c0f\u578b\u9879\u76ee\u6216\u5355\u7528\u6237\u5e94\u7528\u3002\u5728 Python \u4e2d\uff0csqlite3<\/code> \u662f\u5185\u7f6e\u7684 SQLite \u9a71\u52a8\u7a0b\u5e8f\u3002<\/p>\n<\/p>\n
import sqlite3<\/p>\n
\u5efa\u7acb\u8fde\u63a5<\/strong><\/h2>\n
conn = sqlite3.connect("yourdatabase.db")<\/p>\n
cursor = conn.cursor()<\/p>\n
\u66f4\u65b0\u6570\u636e<\/strong><\/h2>\n
update_query = "UPDATE yourtable SET column1 = ? WHERE column2 = ?"<\/p>\n
data = ("new_value", "condition_value")<\/p>\n
cursor.execute(update_query, data)<\/p>\n
\u63d0\u4ea4\u4e8b\u52a1<\/strong><\/h2>\n
conn.commit()<\/p>\n
\u5173\u95ed\u8fde\u63a5<\/strong><\/h2>\n
cursor.close()<\/p>\n
conn.close()<\/p>\n
<\/code><\/pre>\n<\/p>\n
4. SQLAlchemy<\/h4>\n<\/p>\n
SQLAlchemy \u662f\u4e00\u4e2a\u529f\u80fd\u5f3a\u5927\u7684 SQL \u5de5\u5177\u5305\u548c\u5bf9\u8c61\u5173\u7cfb\u6620\u5c04\uff08ORM\uff09\u5e93\uff0c\u9002\u7528\u4e8e\u590d\u6742\u7684\u6570\u636e\u5e93\u64cd\u4f5c\u548c\u5bf9\u8c61\u6620\u5c04\u3002<\/p>\n<\/p>\n
from sqlalchemy import create_engine, Table, MetaData<\/p>\n
from sqlalchemy.orm import sessionmaker<\/p>\n
\u5efa\u7acb\u8fde\u63a5<\/strong><\/h2>\n
engine = create_engine("sqlite:\/\/\/yourdatabase.db")<\/p>\n
Session = sessionmaker(bind=engine)<\/p>\n
session = Session()<\/p>\n
\u83b7\u53d6\u8868\u5bf9\u8c61<\/strong><\/h2>\n
metadata = MetaData(bind=engine)<\/p>\n
yourtable = Table('yourtable', metadata, autoload=True)<\/p>\n
\u66f4\u65b0\u6570\u636e<\/strong><\/h2>\n
session.execute(yourtable.update().where(yourtable.c.column2 == "condition_value").values(column1="new_value"))<\/p>\n
\u63d0\u4ea4\u4e8b\u52a1<\/strong><\/h2>\n
session.commit()<\/p>\n
\u5173\u95ed\u8fde\u63a5<\/strong><\/h2>\n
session.close()<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e8c\u3001\u5efa\u7acb\u6570\u636e\u5e93\u8fde\u63a5<\/h3>\n<\/p>\n
\u65e0\u8bba\u9009\u62e9\u54ea\u79cd\u6570\u636e\u5e93\u5e93\uff0c\u5efa\u7acb\u4e0e\u6570\u636e\u5e93\u7684\u8fde\u63a5\u90fd\u662f\u7b2c\u4e00\u6b65\u3002\u8fde\u63a5\u53c2\u6570\u901a\u5e38\u5305\u62ec\u4e3b\u673a\u540d\u3001\u7528\u6237\u540d\u3001\u5bc6\u7801\u548c\u6570\u636e\u5e93\u540d\u3002\u5728\u5efa\u7acb\u8fde\u63a5\u65f6\uff0c\u5e94\u786e\u4fdd\u8fd9\u4e9b\u53c2\u6570\u7684\u6b63\u786e\u6027\u3002<\/p>\n<\/p>\n
1. \u5efa\u7acb MySQL \u8fde\u63a5<\/h4>\n<\/p>\n
import mysql.connector<\/p>\n
conn = mysql.connector.connect(<\/p>\n
    host="localhost",<\/p>\n
    user="yourusername",<\/p>\n
    password="yourpassword",<\/p>\n
    database="yourdatabase"<\/p>\n
)<\/p>\n
<\/code><\/pre>\n<\/p>\n
2. \u5efa\u7acb PostgreSQL \u8fde\u63a5<\/h4>\n<\/p>\n
import psycopg2<\/p>\n
conn = psycopg2.connect(<\/p>\n
    host="localhost",<\/p>\n
    user="yourusername",<\/p>\n
    password="yourpassword",<\/p>\n
    dbname="yourdatabase"<\/p>\n
)<\/p>\n
<\/code><\/pre>\n<\/p>\n
3. \u5efa\u7acb SQLite \u8fde\u63a5<\/h4>\n<\/p>\n
import sqlite3<\/p>\n
conn = sqlite3.connect("yourdatabase.db")<\/p>\n
<\/code><\/pre>\n<\/p>\n
4. \u5efa\u7acb SQLAlchemy \u8fde\u63a5<\/h4>\n<\/p>\n
from sqlalchemy import create_engine<\/p>\n
from sqlalchemy.orm import sessionmaker<\/p>\n
engine = create_engine("sqlite:\/\/\/yourdatabase.db")<\/p>\n
Session = sessionmaker(bind=engine)<\/p>\n
session = Session()<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e09\u3001\u7f16\u5199 SQL \u66f4\u65b0\u8bed\u53e5<\/h3>\n<\/p>\n
SQL \u66f4\u65b0\u8bed\u53e5\u7528\u4e8e\u4fee\u6539\u6570\u636e\u5e93\u4e2d\u7684\u73b0\u6709\u6570\u636e\u3002\u5178\u578b\u7684 SQL \u66f4\u65b0\u8bed\u53e5\u683c\u5f0f\u5982\u4e0b\uff1a<\/p>\n<\/p>\n
UPDATE table_name<\/p>\n
SET column1 = value1, column2 = value2, ...<\/p>\n
WHERE condition;<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728 Python \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u53c2\u6570\u5316\u67e5\u8be2\u6765\u9632\u6b62 SQL \u6ce8\u5165\u653b\u51fb\u3002<\/p>\n<\/p>\n
1. MySQL \u66f4\u65b0\u8bed\u53e5<\/h4>\n<\/p>\n
update_query = "UPDATE yourtable SET column1 = %s WHERE column2 = %s"<\/p>\n
data = ("new_value", "condition_value")<\/p>\n
cursor.execute(update_query, data)<\/p>\n
<\/code><\/pre>\n<\/p>\n
2. PostgreSQL \u66f4\u65b0\u8bed\u53e5<\/h4>\n<\/p>\n
update_query = "UPDATE yourtable SET column1 = %s WHERE column2 = %s"<\/p>\n
data = ("new_value", "condition_value")<\/p>\n
cursor.execute(update_query, data)<\/p>\n
<\/code><\/pre>\n<\/p>\n
3. SQLite \u66f4\u65b0\u8bed\u53e5<\/h4>\n<\/p>\n
update_query = "UPDATE yourtable SET column1 = ? WHERE column2 = ?"<\/p>\n
data = ("new_value", "condition_value")<\/p>\n
cursor.execute(update_query, data)<\/p>\n
<\/code><\/pre>\n<\/p>\n
4. SQLAlchemy \u66f4\u65b0\u8bed\u53e5<\/h4>\n<\/p>\n
session.execute(yourtable.update().where(yourtable.c.column2 == "condition_value").values(column1="new_value"))<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u56db\u3001\u6267\u884c\u66f4\u65b0\u64cd\u4f5c<\/h3>\n<\/p>\n
\u6267\u884c\u66f4\u65b0\u64cd\u4f5c\u65f6\uff0c\u9700\u8981\u4f7f\u7528\u6570\u636e\u5e93\u5e93\u63d0\u4f9b\u7684\u6267\u884c\u65b9\u6cd5\u3002\u4f8b\u5982\uff0c\u5bf9\u4e8e MySQL \u548c PostgreSQL\uff0c\u53ef\u4ee5\u4f7f\u7528 cursor.execute()<\/code> \u65b9\u6cd5\uff0c\u5bf9\u4e8e SQLite\uff0c\u53ef\u4ee5\u4f7f\u7528 cursor.execute()<\/code> \u65b9\u6cd5\uff0c\u5bf9\u4e8e SQLAlchemy\uff0c\u53ef\u4ee5\u4f7f\u7528 session.execute()<\/code> \u65b9\u6cd5\u3002<\/p>\n<\/p>\n
1. MySQL \u6267\u884c\u66f4\u65b0\u64cd\u4f5c<\/h4>\n<\/p>\n
cursor.execute(update_query, data)<\/p>\n
<\/code><\/pre>\n<\/p>\n
2. PostgreSQL \u6267\u884c\u66f4\u65b0\u64cd\u4f5c<\/h4>\n<\/p>\n
cursor.execute(update_query, data)<\/p>\n
<\/code><\/pre>\n<\/p>\n
3. SQLite \u6267\u884c\u66f4\u65b0\u64cd\u4f5c<\/h4>\n<\/p>\n
cursor.execute(update_query, data)<\/p>\n
<\/code><\/pre>\n<\/p>\n
4. SQLAlchemy \u6267\u884c\u66f4\u65b0\u64cd\u4f5c<\/h4>\n<\/p>\n
session.execute(yourtable.update().where(yourtable.c.column2 == "condition_value").values(column1="new_value"))<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e94\u3001\u5904\u7406\u9519\u8bef\u548c\u63d0\u4ea4\u4e8b\u52a1<\/h3>\n<\/p>\n
\u5728\u6267\u884c\u66f4\u65b0\u64cd\u4f5c\u65f6\uff0c\u53ef\u80fd\u4f1a\u9047\u5230\u5404\u79cd\u9519\u8bef\uff0c\u5982\u8fde\u63a5\u9519\u8bef\u3001SQL \u8bed\u6cd5\u9519\u8bef\u7b49\u3002\u5e94\u4f7f\u7528\u5f02\u5e38\u5904\u7406\u673a\u5236\u6765\u6355\u83b7\u548c\u5904\u7406\u8fd9\u4e9b\u9519\u8bef\u3002\u6b64\u5916\uff0c\u66f4\u65b0\u64cd\u4f5c\u901a\u5e38\u9700\u8981\u663e\u5f0f\u63d0\u4ea4\u4e8b\u52a1\uff0c\u4ee5\u786e\u4fdd\u66f4\u6539\u88ab\u6c38\u4e45\u4fdd\u5b58\u3002<\/p>\n<\/p>\n
1. MySQL \u5904\u7406\u9519\u8bef\u548c\u63d0\u4ea4\u4e8b\u52a1<\/h4>\n<\/p>\n
try:<\/p>\n
    cursor.execute(update_query, data)<\/p>\n
    conn.commit()<\/p>\n
except mysql.connector.Error as err:<\/p>\n
    print(f"Error: {err}")<\/p>\n
    conn.rollback()<\/p>\n
finally:<\/p>\n
    cursor.close()<\/p>\n
    conn.close()<\/p>\n
<\/code><\/pre>\n<\/p>\n
2. PostgreSQL \u5904\u7406\u9519\u8bef\u548c\u63d0\u4ea4\u4e8b\u52a1<\/h4>\n<\/p>\n
try:<\/p>\n
    cursor.execute(update_query, data)<\/p>\n
    conn.commit()<\/p>\n
except psycopg2.Error as err:<\/p>\n
    print(f"Error: {err}")<\/p>\n
    conn.rollback()<\/p>\n
finally:<\/p>\n
    cursor.close()<\/p>\n
    conn.close()<\/p>\n
<\/code><\/pre>\n<\/p>\n
3. SQLite \u5904\u7406\u9519\u8bef\u548c\u63d0\u4ea4\u4e8b\u52a1<\/h4>\n<\/p>\n
try:<\/p>\n
    cursor.execute(update_query, data)<\/p>\n
    conn.commit()<\/p>\n
except sqlite3.Error as err:<\/p>\n
    print(f"Error: {err}")<\/p>\n
    conn.rollback()<\/p>\n
finally:<\/p>\n
    cursor.close()<\/p>\n
    conn.close()<\/p>\n
<\/code><\/pre>\n<\/p>\n
4. SQLAlchemy \u5904\u7406\u9519\u8bef\u548c\u63d0\u4ea4\u4e8b\u52a1<\/h4>\n<\/p>\n
try:<\/p>\n
    session.execute(yourtable.update().where(yourtable.c.column2 == "condition_value").values(column1="new_value"))<\/p>\n
    session.commit()<\/p>\n
except Exception as err:<\/p>\n
    print(f"Error: {err}")<\/p>\n
    session.rollback()<\/p>\n
finally:<\/p>\n
    session.close()<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u516d\u3001\u7ed3\u8bba<\/h3>\n<\/p>\n
\u66f4\u65b0\u6570\u636e\u5e93\u6570\u636e\u662f\u6570\u636e\u5e93\u64cd\u4f5c\u4e2d\u7684\u4e00\u9879\u5e38\u89c1\u4efb\u52a1\u3002\u4f7f\u7528 Python \u66f4\u65b0\u6570\u636e\u5e93\u6570\u636e\u65f6\uff0c\u9009\u62e9\u5408\u9002\u7684\u6570\u636e\u5e93\u5e93\u3001\u5efa\u7acb\u6570\u636e\u5e93\u8fde\u63a5\u3001\u7f16\u5199 SQL \u66f4\u65b0\u8bed\u53e5\u3001\u6267\u884c\u66f4\u65b0\u64cd\u4f5c\u3001\u5904\u7406\u9519\u8bef\u548c\u63d0\u4ea4\u4e8b\u52a1\u662f\u5173\u952e\u6b65\u9aa4\u3002\u901a\u8fc7\u672c\u6587\u7684\u4ecb\u7ecd\uff0c\u5e0c\u671b\u8bfb\u8005\u80fd\u591f\u719f\u7ec3\u638c\u63e1\u4f7f\u7528 Python \u66f4\u65b0\u6570\u636e\u5e93\u6570\u636e\u7684\u6280\u5de7\uff0c\u5e76\u6839\u636e\u5b9e\u9645\u9700\u6c42\u9009\u62e9\u6700\u9002\u5408\u7684\u6570\u636e\u5e93\u5e93\u3002<\/p>\n<\/p>\n
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