Python 在未回滚的SQLite内存数据库中的事务中创建表
内存中的SQLite是否支持围绕表创建的事务?我希望下面的代码开始事务,创建表,回滚事务,然后什么都不剩。相反,这张桌子似乎仍然存在Python 在未回滚的SQLite内存数据库中的事务中创建表,python,sqlite,sqlalchemy,transactions,Python,Sqlite,Sqlalchemy,Transactions,内存中的SQLite是否支持围绕表创建的事务?我希望下面的代码开始事务,创建表,回滚事务,然后什么都不剩。相反,这张桌子似乎仍然存在 from sqlalchemy import create_engine, inspect engine = create_engine('sqlite://', echo=True) conn = engine.connect() try: with conn.begin(): conn.execute('''CREATE TABLE
from sqlalchemy import create_engine, inspect
engine = create_engine('sqlite://', echo=True)
conn = engine.connect()
try:
with conn.begin():
conn.execute('''CREATE TABLE test (
"index" BIGINT,
a BIGINT,
b BIGINT
)''')
assert False # rollback
except AssertionError:
pass
tables = inspect(engine).get_table_names()
assert tables == [], tables
断言失败:
Traceback (most recent call last):
File "C:\...\lib\site-packages\IPython\core\interactiveshell.py", line 3418, in run_code
exec(code_obj, self.user_global_ns, self.user_ns)
File "<ipython-input-2-9e170787a857>", line 21, in <module>
assert tables == [], tables
AssertionError: ['test']
编辑:SQLAlchemy版本是
1.3.23
pysqlite DBAPI在事务处理方面存在一些已知问题,包括事务DDL。SQLite方言的SQLAlchemy文档中讨论了它们:
谢谢!我想特别指出的是,我已经验证并修复了这个示例。注意,语法在1.13和1.14之间略有变化。
2021-03-01 12:16:16,872 INFO sqlalchemy.engine.base.Engine SELECT CAST('test plain returns' AS VARCHAR(60)) AS anon_1
2021-03-01 12:16:16,872 INFO sqlalchemy.engine.base.Engine ()
2021-03-01 12:16:16,872 INFO sqlalchemy.engine.base.Engine SELECT CAST('test unicode returns' AS VARCHAR(60)) AS anon_1
2021-03-01 12:16:16,873 INFO sqlalchemy.engine.base.Engine ()
2021-03-01 12:16:16,873 INFO sqlalchemy.engine.base.Engine BEGIN (implicit)
2021-03-01 12:16:16,873 INFO sqlalchemy.engine.base.Engine CREATE TABLE test (
"index" BIGINT,
a BIGINT,
b BIGINT
)
2021-03-01 12:16:16,873 INFO sqlalchemy.engine.base.Engine ()
2021-03-01 12:16:16,874 INFO sqlalchemy.engine.base.Engine ROLLBACK
2021-03-01 12:16:16,874 INFO sqlalchemy.engine.base.Engine SELECT name FROM sqlite_master WHERE type='table' ORDER BY name
2021-03-01 12:16:16,874 INFO sqlalchemy.engine.base.Engine ()