class User:<\/p>\n ...<\/p>\n
@staticmethod<\/p>\n
def get_all_users(conn):<\/p>\n
"""\u67e5\u8be2\u6240\u6709\u7528\u6237"""<\/p>\n
cur = conn.cursor()<\/p>\n
cur.execute("SELECT * FROM users")<\/p>\n
rows = cur.fetchall()<\/p>\n
users = []<\/p>\n
for row in rows:<\/p>\n
user = User(row[0], row[1], row[2])<\/p>\n
users.append(user)<\/p>\n
return users<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0cget_all_users\u65b9\u6cd5\u63a5\u53d7\u4e00\u4e2a\u6570\u636e\u5e93\u8fde\u63a5\u5bf9\u8c61\u4f5c\u4e3a\u53c2\u6570\uff0c\u5e76\u6267\u884c\u4e00\u6761SELECT SQL\u8bed\u53e5\u6765\u67e5\u8be2\u6240\u6709\u7528\u6237\u3002\u67e5\u8be2\u7ed3\u679c\u4fdd\u5b58\u5728rows\u4e2d\uff0c\u6211\u4eec\u901a\u8fc7\u904d\u5386rows\u6765\u521b\u5efaUser\u5bf9\u8c61\uff0c\u5e76\u5c06\u5176\u6dfb\u52a0\u5230users\u5217\u8868\u4e2d\u3002\u6700\u7ec8\uff0cget_all_users\u65b9\u6cd5\u8fd4\u56de\u4e00\u4e2a\u5305\u542b\u6240\u6709\u7528\u6237\u5bf9\u8c61\u7684\u5217\u8868\u3002<\/p>\n<\/p>\n
\u56db\u3001\u63d2\u5165\u3001\u66f4\u65b0\u548c\u5220\u9664\u64cd\u4f5c<\/p>\n<\/p>\n
\u9664\u4e86\u67e5\u8be2\u64cd\u4f5c\u5916\uff0cORM\u8fd8\u9700\u8981\u652f\u6301\u63d2\u5165\u3001\u66f4\u65b0\u548c\u5220\u9664\u6570\u636e\u3002\u5728Python\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u5b9a\u4e49\u7c7b\u65b9\u6cd5\u6765\u5b9e\u73b0\u8fd9\u4e9b\u64cd\u4f5c\u3002<\/p>\n<\/p>\n
\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u4ee5\u4e3aUser\u7c7b\u6dfb\u52a0\u4e00\u4e2a\u65b9\u6cd5\uff0c\u7528\u4e8e\u63d2\u5165\u65b0\u7684\u7528\u6237\uff1a<\/p>\n<\/p>\n
class User:<\/p>\n ...<\/p>\n
def insert(self, conn):<\/p>\n
"""\u63d2\u5165\u65b0\u7528\u6237"""<\/p>\n
cur = conn.cursor()<\/p>\n
cur.execute("INSERT INTO users (id, name, email) VALUES (?, ?, ?)",<\/p>\n
(self.id, self.name, self.email))<\/p>\n
conn.commit()<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0cinsert\u65b9\u6cd5\u7528\u4e8e\u5c06User\u5bf9\u8c61\u7684\u5c5e\u6027\u63d2\u5165\u5230users\u8868\u4e2d\u3002\u6211\u4eec\u901a\u8fc7\u6267\u884cINSERT SQL\u8bed\u53e5\uff0c\u5c06\u7528\u6237\u7684id\u3001name\u548cemail\u63d2\u5165\u5230\u76f8\u5e94\u7684\u5b57\u6bb5\u4e2d\u3002\u6267\u884c\u5b8cSQL\u8bed\u53e5\u540e\uff0c\u901a\u8fc7\u8c03\u7528conn.commit()\u65b9\u6cd5\u63d0\u4ea4\u4e8b\u52a1\uff0c\u4ee5\u786e\u4fdd\u6570\u636e\u88ab\u5199\u5165\u6570\u636e\u5e93\u3002<\/p>\n<\/p>\n
\u7c7b\u4f3c\u5730\uff0c\u6211\u4eec\u53ef\u4ee5\u5b9a\u4e49update\u548cdelete\u65b9\u6cd5\uff0c\u7528\u4e8e\u66f4\u65b0\u548c\u5220\u9664\u7528\u6237\u6570\u636e\uff1a<\/p>\n<\/p>\n
class User:<\/p>\n ...<\/p>\n
def update(self, conn):<\/p>\n
"""\u66f4\u65b0\u7528\u6237\u4fe1\u606f"""<\/p>\n
cur = conn.cursor()<\/p>\n
cur.execute("UPDATE users SET name = ?, email = ? WHERE id = ?",<\/p>\n
(self.name, self.email, self.id))<\/p>\n
conn.commit()<\/p>\n
def delete(self, conn):<\/p>\n
"""\u5220\u9664\u7528\u6237"""<\/p>\n
cur = conn.cursor()<\/p>\n
cur.execute("DELETE FROM users WHERE id = ?", (self.id,))<\/p>\n
conn.commit()<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728update\u65b9\u6cd5\u4e2d\uff0c\u6211\u4eec\u901a\u8fc7\u6267\u884cUPDATE SQL\u8bed\u53e5\uff0c\u4f7f\u7528User\u5bf9\u8c61\u7684\u5c5e\u6027\u66f4\u65b0users\u8868\u4e2d\u7684\u76f8\u5e94\u8bb0\u5f55\u3002\u7c7b\u4f3c\u5730\uff0c\u5728delete\u65b9\u6cd5\u4e2d\uff0c\u6211\u4eec\u901a\u8fc7\u6267\u884cDELETE SQL\u8bed\u53e5\uff0c\u5220\u9664\u6307\u5b9aid\u7684\u7528\u6237\u8bb0\u5f55\u3002<\/p>\n<\/p>\n
\u4e94\u3001\u4e8b\u52a1\u7ba1\u7406\u548c\u9519\u8bef\u5904\u7406<\/p>\n<\/p>\n
\u5728\u5b9e\u73b0ORM\u65f6\uff0c\u4e8b\u52a1\u7ba1\u7406\u548c\u9519\u8bef\u5904\u7406\u4e5f\u662f\u975e\u5e38\u91cd\u8981\u7684\u90e8\u5206\u3002\u4e8b\u52a1\u7ba1\u7406\u7528\u4e8e\u786e\u4fdd\u4e00\u7cfb\u5217\u6570\u636e\u5e93\u64cd\u4f5c\u8981\u4e48\u5168\u90e8\u6210\u529f\uff0c\u8981\u4e48\u5168\u90e8\u5931\u8d25\uff0c\u4ee5\u4fdd\u6301\u6570\u636e\u7684\u4e00\u81f4\u6027\u548c\u5b8c\u6574\u6027\u3002\u9519\u8bef\u5904\u7406\u5219\u7528\u4e8e\u6355\u83b7\u548c\u5904\u7406\u6570\u636e\u5e93\u64cd\u4f5c\u4e2d\u7684\u5f02\u5e38\u60c5\u51b5\u3002<\/p>\n<\/p>\n
\u5728Python\u4e2d\uff0c\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528try…except\u8bed\u53e5\u6765\u5b9e\u73b0\u9519\u8bef\u5904\u7406\u3002\u5bf9\u4e8e\u4e8b\u52a1\u7ba1\u7406\uff0c\u53ef\u4ee5\u5728\u6267\u884c\u4e00\u7cfb\u5217\u6570\u636e\u5e93\u64cd\u4f5c\u524d\u8c03\u7528conn.begin()\uff0c\u5728\u6240\u6709\u64cd\u4f5c\u6210\u529f\u540e\u8c03\u7528conn.commit()\uff0c\u5982\u679c\u53d1\u751f\u5f02\u5e38\u5219\u8c03\u7528conn.rollback()\u6765\u56de\u6eda\u4e8b\u52a1\u3002<\/p>\n<\/p>\n
\u4ee5\u4e0b\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u4e8b\u52a1\u7ba1\u7406\u548c\u9519\u8bef\u5904\u7406\u793a\u4f8b\uff1a<\/p>\n<\/p>\n
def execute_transaction(conn, operations):<\/p>\n """\u6267\u884c\u4e8b\u52a1"""<\/p>\n
try:<\/p>\n
conn.begin()<\/p>\n
for operation in operations:<\/p>\n
operation()<\/p>\n
conn.commit()<\/p>\n
except Exception as e:<\/p>\n
conn.rollback()<\/p>\n
print(f"\u4e8b\u52a1\u5931\u8d25: {e}")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0cexecute_transaction\u51fd\u6570\u63a5\u53d7\u4e00\u4e2a\u6570\u636e\u5e93\u8fde\u63a5\u5bf9\u8c61\u548c\u4e00\u4e2a\u64cd\u4f5c\u5217\u8868\uff08operations\uff09\u4f5c\u4e3a\u53c2\u6570\u3002\u6211\u4eec\u5728try\u5757\u4e2d\u5f00\u59cb\u4e8b\u52a1\uff0c\u5e76\u6267\u884c\u6240\u6709\u64cd\u4f5c\u3002\u5982\u679c\u6240\u6709\u64cd\u4f5c\u90fd\u6210\u529f\uff0c\u5219\u63d0\u4ea4\u4e8b\u52a1\u3002\u5982\u679c\u53d1\u751f\u5f02\u5e38\uff0c\u5219\u56de\u6eda\u4e8b\u52a1\u5e76\u6253\u5370\u9519\u8bef\u4fe1\u606f\u3002<\/p>\n<\/p>\n
\u516d\u3001\u4f7f\u7528\u73b0\u6709\u7684ORM\u6846\u67b6<\/p>\n<\/p>\n
\u9664\u4e86\u81ea\u884c\u5b9e\u73b0ORM\u5916\uff0cPython\u4e2d\u8fd8\u6709\u8bb8\u591a\u6210\u719f\u7684ORM\u6846\u67b6\u53ef\u4f9b\u4f7f\u7528\uff0c\u5982SQLAlchemy\u3001Django ORM\u7b49\u3002\u4f7f\u7528\u8fd9\u4e9b\u6846\u67b6\u53ef\u4ee5\u5927\u5927\u7b80\u5316\u5f00\u53d1\u8fc7\u7a0b\uff0c\u5e76\u63d0\u4f9b\u66f4\u591a\u7684\u529f\u80fd\u548c\u4f18\u5316\u3002<\/p>\n<\/p>\n
\u4ee5SQLAlchemy\u4e3a\u4f8b\uff0c\u5b83\u662f\u4e00\u4e2a\u529f\u80fd\u5f3a\u5927\u4e14\u7075\u6d3b\u7684ORM\u6846\u67b6\uff0c\u652f\u6301\u591a\u79cd\u6570\u636e\u5e93\u548c\u590d\u6742\u7684\u67e5\u8be2\u64cd\u4f5c\u3002\u4f7f\u7528SQLAlchemy\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u5b9a\u4e49\u6a21\u578b\u7c7b\u6765\u6620\u5c04\u6570\u636e\u5e93\u8868\uff0c\u5e76\u4f7f\u7528session\u5bf9\u8c61\u6765\u6267\u884c\u6570\u636e\u5e93\u64cd\u4f5c\u3002<\/p>\n<\/p>\n
\u4ee5\u4e0b\u662f\u4e00\u4e2a\u4f7f\u7528SQLAlchemy\u7684\u7b80\u5355\u793a\u4f8b\uff1a<\/p>\n<\/p>\n
from sqlalchemy import create_engine, Column, Integer, String<\/p>\nfrom sqlalchemy.ext.declarative import declarative_base<\/p>\n
from sqlalchemy.orm import sessionmaker<\/p>\n
Base = declarative_base()<\/p>\n
class User(Base):<\/p>\n
__tablename__ = 'users'<\/p>\n
id = Column(Integer, primary_key=True)<\/p>\n
name = Column(String)<\/p>\n
email = Column(String)<\/p>\n
engine = create_engine('sqlite:\/\/\/example.db')<\/p>\n
Session = sessionmaker(bind=engine)<\/p>\n
session = Session()<\/p>\n
\u63d2\u5165\u65b0\u7528\u6237<\/strong><\/h2>\nnew_user = User(id=1, name='Alice', email='alice@example.com')<\/p>\n
session.add(new_user)<\/p>\n
session.commit()<\/p>\n
\u67e5\u8be2\u6240\u6709\u7528\u6237<\/strong><\/h2>\nusers = session.query(User).all()<\/p>\n
for user in users:<\/p>\n
print(user.name, user.email)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528SQLAlchemy\u5b9a\u4e49\u4e86\u4e00\u4e2aUser\u6a21\u578b\u7c7b\uff0c\u5e76\u4f7f\u7528create_engine\u548csessionmaker\u521b\u5efa\u4e86\u6570\u636e\u5e93\u8fde\u63a5\u548c\u4f1a\u8bdd\u3002\u901a\u8fc7session\uff0c\u6211\u4eec\u53ef\u4ee5\u6267\u884c\u63d2\u5165\u548c\u67e5\u8be2\u64cd\u4f5c\uff0c\u800c\u65e0\u9700\u624b\u52a8\u7f16\u5199SQL\u8bed\u53e5\u3002SQLAlchemy\u8fd8\u63d0\u4f9b\u4e86\u8bb8\u591a\u9ad8\u7ea7\u529f\u80fd\uff0c\u5982\u5173\u7cfb\u6620\u5c04\u3001\u67e5\u8be2\u6784\u5efa\u5668\u7b49\uff0c\u4f7f\u5f97\u5f00\u53d1\u8005\u53ef\u4ee5\u66f4\u52a0\u9ad8\u6548\u5730\u64cd\u4f5c\u6570\u636e\u5e93\u3002<\/p>\n<\/p>\n
\u603b\u7ed3<\/p>\n<\/p>\n
\u5b9e\u73b0ORM\uff08\u5bf9\u8c61\u5173\u7cfb\u6620\u5c04\uff09\u662fPython\u5e94\u7528\u7a0b\u5e8f\u5f00\u53d1\u4e2d\u7684\u4e00\u4e2a\u91cd\u8981\u65b9\u9762\u3002\u901a\u8fc7\u521b\u5efa\u7c7b\u6a21\u578b\u3001\u5b9a\u4e49\u6570\u636e\u5e93\u8fde\u63a5\u3001\u7f16\u5199\u67e5\u8be2\u63a5\u53e3\uff0c\u4ee5\u53ca\u652f\u6301\u63d2\u5165\u3001\u66f4\u65b0\u548c\u5220\u9664\u64cd\u4f5c\uff0c\u6211\u4eec\u53ef\u4ee5\u5b9e\u73b0\u57fa\u672c\u7684ORM\u529f\u80fd\u3002\u6b64\u5916\uff0c\u4e8b\u52a1\u7ba1\u7406\u548c\u9519\u8bef\u5904\u7406\u4e5f\u662f\u5b9e\u73b0ORM\u65f6\u9700\u8981\u8003\u8651\u7684\u5173\u952e\u90e8\u5206\u3002\u867d\u7136\u81ea\u884c\u5b9e\u73b0ORM\u53ef\u4ee5\u5e2e\u52a9\u6211\u4eec\u7406\u89e3\u5176\u5de5\u4f5c\u539f\u7406\uff0c\u4f46\u5728\u5b9e\u9645\u5f00\u53d1\u4e2d\uff0c\u4f7f\u7528\u6210\u719f\u7684ORM\u6846\u67b6\uff08\u5982SQLAlchemy\u3001Django ORM\u7b49\uff09\u53ef\u4ee5\u5927\u5927\u7b80\u5316\u5f00\u53d1\u8fc7\u7a0b\uff0c\u63d0\u9ad8\u5f00\u53d1\u6548\u7387\u3002\u65e0\u8bba\u662f\u81ea\u884c\u5b9e\u73b0\u8fd8\u662f\u4f7f\u7528\u73b0\u6709\u6846\u67b6\uff0cORM\u90fd\u4e3a\u5f00\u53d1\u8005\u63d0\u4f9b\u4e86\u4e00\u79cd\u66f4\u52a0\u76f4\u89c2\u548c\u9ad8\u6548\u7684\u65b9\u5f0f\u6765\u64cd\u4f5c\u5173\u7cfb\u6570\u636e\u5e93\u3002<\/p>\n<\/p>\n
\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n \u5982\u4f55\u9009\u62e9\u9002\u5408\u7684ORM\u5e93\u6765\u5b9e\u73b0Python\u7684ORM\u529f\u80fd\uff1f<\/strong>
\u5728Python\u4e2d\uff0c\u6709\u591a\u4e2aORM\u5e93\u53ef\u4f9b\u9009\u62e9\uff0c\u6bd4\u5982SQLAlchemy\u3001Django ORM\u548cPeewee\u7b49\u3002\u9009\u62e9\u5408\u9002\u7684ORM\u5e93\u901a\u5e38\u53d6\u51b3\u4e8e\u9879\u76ee\u7684\u9700\u6c42\u548c\u5f00\u53d1\u8005\u7684\u719f\u6089\u7a0b\u5ea6\u3002\u5982\u679c\u4f60\u6b63\u5728\u8fdb\u884c\u4e00\u4e2a\u5927\u578b\u9879\u76ee\uff0cSQLAlchemy\u53ef\u80fd\u662f\u6700\u4f73\u9009\u62e9\uff0c\u56e0\u4e3a\u5b83\u529f\u80fd\u5f3a\u5927\u4e14\u7075\u6d3b\u3002\u5bf9\u4e8e\u5c0f\u578b\u9879\u76ee\uff0cDjango ORM\u6216Peewee\u5219\u53ef\u80fd\u66f4\u7b80\u6d01\u6613\u7528\u3002<\/p>\n\u5728\u4f7f\u7528Python ORM\u65f6\uff0c\u5982\u4f55\u6709\u6548\u7ba1\u7406\u6570\u636e\u5e93\u8fc1\u79fb\uff1f<\/strong>
\u6570\u636e\u5e93\u8fc1\u79fb\u662fORM\u4f7f\u7528\u4e2d\u7684\u4e00\u4e2a\u91cd\u8981\u65b9\u9762\u3002\u4f7f\u7528\u50cfAlembic\uff08\u4e0eSQLAlchemy\u4e00\u8d77\u4f7f\u7528\uff09\u6216Django\u5185\u7f6e\u7684\u8fc1\u79fb\u5de5\u5177\uff0c\u53ef\u4ee5\u5e2e\u52a9\u4f60\u8ddf\u8e2a\u548c\u7ba1\u7406\u6570\u636e\u5e93\u6a21\u5f0f\u7684\u53d8\u5316\u3002\u786e\u4fdd\u5728\u6bcf\u6b21\u5bf9\u6a21\u578b\u8fdb\u884c\u66f4\u6539\u540e\uff0c\u53ca\u65f6\u751f\u6210\u548c\u5e94\u7528\u8fc1\u79fb\uff0c\u8fd9\u6837\u53ef\u4ee5\u4fdd\u6301\u6570\u636e\u5e93\u4e0e\u4ee3\u7801\u7684\u4e00\u81f4\u6027\uff0c\u907f\u514d\u6f5c\u5728\u7684\u9519\u8bef\u3002<\/p>\n\u4f7f\u7528ORM\u65f6\uff0c\u5982\u4f55\u4f18\u5316\u67e5\u8be2\u6027\u80fd\u4ee5\u63d0\u9ad8\u5e94\u7528\u901f\u5ea6\uff1f<\/strong>
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