Python SQLAlchemy与数据库交互操作完整指南

pip install sqlalchemy

from sqlalchemy import create_engine

# 创建数据库引擎
engine = create_engine('sqlite:///my_database.db', echo=True)

# 在内存中创建数据库
# engine = create_engine('sqlite:///:memory:', echo=True)

from sqlalchemy import Table, Column, Integer, String, MetaData

metadata = MetaData()

# 创建一个数据表
users = Table('users', metadata,
    Column('id', Integer, primary_key=True),
    Column('name', String),
    Column('age', Integer)
)

metadata.create_all(engine)

# 插入数据
conn = engine.connect()

insert_query = users.insert().values(name='Alice', age=25)
conn.execute(insert_query)

insert_data = [
    {'name': 'Bob', 'age': 30},
    {'name': 'Charlie', 'age': 22}
]

conn.execute(users.insert(), insert_data)

from sqlalchemy.sql import select

# 查询数据
select_query = select([users])
result = conn.execute(select_query)

for row in result:
    print(row)

# 更新数据
update_query = users.update().where(users.c.id == 1).values(name='Alex')
conn.execute(update_query)

# 删除数据
delete_query = users.delete().where(users.c.id == 2)
conn.execute(delete_query)