sqlalcodegen 客户端无法连接到服务器，因为请求的实例不可用
sqlalcodegen The client cannot connect to the server because the requested instance was not available
目前我正在尝试使用 sql server express
设置 sqlalchemy orm
下面的代码没有问题并且输出正确：
from sqlalchemy import create_engine
from sqlalchemy.orm import session, sessionmaker
import urllib
from dotenv import load_dotenv
import os
load_dotenv()
db_pass = os.getenv('DATABASE_PASS')
engine = create_engine(f'mssql+pyodbc://grimm:{db_pass}@localhost\SQLEXPRESS/GrimmDB?driver=ODBC+Driver+17+for+SQL+Server')
Session = sessionmaker(bind=engine)
session = Session
with engine.connect() as conn:
rs = conn.execute('SELECT * FROM Users')
for row in rs:
print(row)
output:
(1, 10101, True, 100)
然而问题出在我尝试使用 sqlacodegen:
sqlacodegen --outfile 'm.py' 'mssql+pyodbc://grimm:pass@localhost\SQLEXPRESS/GrimmDB?driver=ODBC+Driver+17+for+SQL+Server'
这是我的错误
Traceback (most recent call last):
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\engine\base.py", line 3212, in _wrap_pool_connect
return fn()
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\pool\base.py", line 307, in connect
return _ConnectionFairy._checkout(self)
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\pool\base.py", line 767, in _checkout
fairy = _ConnectionRecord.checkout(pool)
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\pool\base.py", line 425, in checkout
rec = pool._do_get()
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\pool\impl.py", line 146, in _do_get
self._dec_overflow()
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\util\langhelpers.py", line 70, in __exit__
compat.raise_(
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\util\compat.py", line 207, in raise_
raise exception
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\pool\impl.py", line 143, in _do_get
return self._create_connection()
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\pool\base.py", line 253, in _create_connection
return _ConnectionRecord(self)
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\pool\base.py", line 368, in __init__
self.__connect()
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\pool\base.py", line 611, in __connect
pool.logger.debug("Error on connect(): %s", e)
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\util\langhelpers.py", line 70, in __exit__
compat.raise_(
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\util\compat.py", line 207, in raise_
raise exception
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\pool\base.py", line 605, in __connect
connection = pool._invoke_creator(self)
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\engine\create.py", line 578, in connect
return dialect.connect(*cargs, **cparams)
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\engine\default.py", line 584, in connect
return self.dbapi.connect(*cargs, **cparams)
pyodbc.OperationalError: ('08001', '[08001] [Microsoft][ODBC Driver 17 for SQL Server]The client cannot connect to the server because the requested instance was not available. Use SQL Server Configuration Manager to make sure the SQL Server instance is configured correctly. (0) (SQLDriverConnect)')
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "c:\users\jotha\appdata\local\programs\python\python39\lib\runpy.py", line 197, in _run_module_as_main
return _run_code(code, main_globals, None,
File "c:\users\jotha\appdata\local\programs\python\python39\lib\runpy.py", line 87, in _run_code
exec(code, run_globals)
File "C:\Users\jotha\AppData\Local\Programs\Python\Python39\Scripts\sqlacodegen.exe\__main__.py", line 7, in <module>
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlacodegen\main.py", line 57, in main
metadata.reflect(engine, args.schema, not args.noviews, tables)
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\sql\schema.py", line 4652, in reflect
with inspection.inspect(bind)._inspection_context() as insp:
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\inspection.py", line 64, in inspect
ret = reg(subject)
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\engine\reflection.py", line 182, in _engine_insp
return Inspector._construct(Inspector._init_engine, bind)
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\engine\reflection.py", line 117, in _construct
init(self, bind)
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\engine\reflection.py", line 128, in _init_engine
engine.connect().close()
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\engine\base.py", line 3166, in connect
return self._connection_cls(self, close_with_result=close_with_result)
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\engine\base.py", line 96, in __init__
else engine.raw_connection()
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\engine\base.py", line 3245, in raw_connection
return self._wrap_pool_connect(self.pool.connect, _connection)
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\engine\base.py", line 3215, in _wrap_pool_connect
Connection._handle_dbapi_exception_noconnection(
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\engine\base.py", line 2069, in _handle_dbapi_exception_noconnection
util.raise_(
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\util\compat.py", line 207, in raise_
raise exception
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\engine\base.py", line 3212, in _wrap_pool_connect
return fn()
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\pool\base.py", line 307, in connect
return _ConnectionFairy._checkout(self)
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\pool\base.py", line 767, in _checkout
fairy = _ConnectionRecord.checkout(pool)
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\pool\base.py", line 425, in checkout
rec = pool._do_get()
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\pool\impl.py", line 146, in _do_get
self._dec_overflow()
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\util\langhelpers.py", line 70, in __exit__
compat.raise_(
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\util\compat.py", line 207, in raise_
raise exception
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\pool\impl.py", line 143, in _do_get
return self._create_connection()
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\pool\base.py", line 253, in _create_connection
return _ConnectionRecord(self)
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\pool\base.py", line 368, in __init__
self.__connect()
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\pool\base.py", line 611, in __connect
pool.logger.debug("Error on connect(): %s", e)
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\util\langhelpers.py", line 70, in __exit__
compat.raise_(
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\util\compat.py", line 207, in raise_
raise exception
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\pool\base.py", line 605, in __connect
connection = pool._invoke_creator(self)
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\engine\create.py", line 578, in connect
return dialect.connect(*cargs, **cparams)
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\engine\default.py", line 584, in connect
return self.dbapi.connect(*cargs, **cparams)
sqlalchemy.exc.OperationalError: (pyodbc.OperationalError) ('08001', '[08001] [Microsoft][ODBC Driver 17 for SQL Server]The client cannot connect to the server because the requested instance was not available. Use SQL Server Configuration Manager to make sure the SQL Server instance is configured correctly. (0) (SQLDriverConnect)')
(Background on this error at: https://sqlalche.me/e/14/e3q8)
有什么想法吗？我在这里有点难过。问题可能出在连接字符串上，但我不知道是什么，而且我似乎找不到文档。
提前致谢，
乔森·凯勒波罗
答案就在'SQLEXPRESS'
之前CLI中的转义序列
之前
sqlacodegen --outfile 'm.py' 'mssql+pyodbc://grimm:pass@localhost\SQLEXPRESS/GrimmDB?driver=ODBC+Driver+17+for+SQL+Server'
之后
sqlacodegen --outfile 'm.py' 'mssql+pyodbc://grimm:pass@localhost\SQLEXPRESS/GrimmDB?driver=ODBC+Driver+17+for+SQL+Server'
目前我正在尝试使用 sql server express
设置 sqlalchemy orm下面的代码没有问题并且输出正确：
from sqlalchemy import create_engine
from sqlalchemy.orm import session, sessionmaker
import urllib
from dotenv import load_dotenv
import os
load_dotenv()
db_pass = os.getenv('DATABASE_PASS')
engine = create_engine(f'mssql+pyodbc://grimm:{db_pass}@localhost\SQLEXPRESS/GrimmDB?driver=ODBC+Driver+17+for+SQL+Server')
Session = sessionmaker(bind=engine)
session = Session
with engine.connect() as conn:
rs = conn.execute('SELECT * FROM Users')
for row in rs:
print(row)
output:
(1, 10101, True, 100)
然而问题出在我尝试使用 sqlacodegen:
sqlacodegen --outfile 'm.py' 'mssql+pyodbc://grimm:pass@localhost\SQLEXPRESS/GrimmDB?driver=ODBC+Driver+17+for+SQL+Server'
这是我的错误
Traceback (most recent call last):
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\engine\base.py", line 3212, in _wrap_pool_connect
return fn()
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\pool\base.py", line 307, in connect
return _ConnectionFairy._checkout(self)
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\pool\base.py", line 767, in _checkout
fairy = _ConnectionRecord.checkout(pool)
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\pool\base.py", line 425, in checkout
rec = pool._do_get()
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\pool\impl.py", line 146, in _do_get
self._dec_overflow()
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\util\langhelpers.py", line 70, in __exit__
compat.raise_(
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\util\compat.py", line 207, in raise_
raise exception
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\pool\impl.py", line 143, in _do_get
return self._create_connection()
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\pool\base.py", line 253, in _create_connection
return _ConnectionRecord(self)
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\pool\base.py", line 368, in __init__
self.__connect()
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\pool\base.py", line 611, in __connect
pool.logger.debug("Error on connect(): %s", e)
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\util\langhelpers.py", line 70, in __exit__
compat.raise_(
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\util\compat.py", line 207, in raise_
raise exception
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\pool\base.py", line 605, in __connect
connection = pool._invoke_creator(self)
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\engine\create.py", line 578, in connect
return dialect.connect(*cargs, **cparams)
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\engine\default.py", line 584, in connect
return self.dbapi.connect(*cargs, **cparams)
pyodbc.OperationalError: ('08001', '[08001] [Microsoft][ODBC Driver 17 for SQL Server]The client cannot connect to the server because the requested instance was not available. Use SQL Server Configuration Manager to make sure the SQL Server instance is configured correctly. (0) (SQLDriverConnect)')
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "c:\users\jotha\appdata\local\programs\python\python39\lib\runpy.py", line 197, in _run_module_as_main
return _run_code(code, main_globals, None,
File "c:\users\jotha\appdata\local\programs\python\python39\lib\runpy.py", line 87, in _run_code
exec(code, run_globals)
File "C:\Users\jotha\AppData\Local\Programs\Python\Python39\Scripts\sqlacodegen.exe\__main__.py", line 7, in <module>
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlacodegen\main.py", line 57, in main
metadata.reflect(engine, args.schema, not args.noviews, tables)
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\sql\schema.py", line 4652, in reflect
with inspection.inspect(bind)._inspection_context() as insp:
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\inspection.py", line 64, in inspect
ret = reg(subject)
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\engine\reflection.py", line 182, in _engine_insp
return Inspector._construct(Inspector._init_engine, bind)
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\engine\reflection.py", line 117, in _construct
init(self, bind)
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\engine\reflection.py", line 128, in _init_engine
engine.connect().close()
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\engine\base.py", line 3166, in connect
return self._connection_cls(self, close_with_result=close_with_result)
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\engine\base.py", line 96, in __init__
else engine.raw_connection()
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\engine\base.py", line 3245, in raw_connection
return self._wrap_pool_connect(self.pool.connect, _connection)
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\engine\base.py", line 3215, in _wrap_pool_connect
Connection._handle_dbapi_exception_noconnection(
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\engine\base.py", line 2069, in _handle_dbapi_exception_noconnection
util.raise_(
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\util\compat.py", line 207, in raise_
raise exception
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\engine\base.py", line 3212, in _wrap_pool_connect
return fn()
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\pool\base.py", line 307, in connect
return _ConnectionFairy._checkout(self)
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\pool\base.py", line 767, in _checkout
fairy = _ConnectionRecord.checkout(pool)
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\pool\base.py", line 425, in checkout
rec = pool._do_get()
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\pool\impl.py", line 146, in _do_get
self._dec_overflow()
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\util\langhelpers.py", line 70, in __exit__
compat.raise_(
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\util\compat.py", line 207, in raise_
raise exception
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\pool\impl.py", line 143, in _do_get
return self._create_connection()
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\pool\base.py", line 253, in _create_connection
return _ConnectionRecord(self)
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\pool\base.py", line 368, in __init__
self.__connect()
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\pool\base.py", line 611, in __connect
pool.logger.debug("Error on connect(): %s", e)
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\util\langhelpers.py", line 70, in __exit__
compat.raise_(
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\util\compat.py", line 207, in raise_
raise exception
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\pool\base.py", line 605, in __connect
connection = pool._invoke_creator(self)
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\engine\create.py", line 578, in connect
return dialect.connect(*cargs, **cparams)
File "c:\users\jotha\appdata\local\programs\python\python39\lib\site-packages\sqlalchemy\engine\default.py", line 584, in connect
return self.dbapi.connect(*cargs, **cparams)
sqlalchemy.exc.OperationalError: (pyodbc.OperationalError) ('08001', '[08001] [Microsoft][ODBC Driver 17 for SQL Server]The client cannot connect to the server because the requested instance was not available. Use SQL Server Configuration Manager to make sure the SQL Server instance is configured correctly. (0) (SQLDriverConnect)')
(Background on this error at: https://sqlalche.me/e/14/e3q8)
有什么想法吗？我在这里有点难过。问题可能出在连接字符串上，但我不知道是什么，而且我似乎找不到文档。
提前致谢， 乔森·凯勒波罗
答案就在'SQLEXPRESS'
之前CLI中的转义序列之前
sqlacodegen --outfile 'm.py' 'mssql+pyodbc://grimm:pass@localhost\SQLEXPRESS/GrimmDB?driver=ODBC+Driver+17+for+SQL+Server'
之后
sqlacodegen --outfile 'm.py' 'mssql+pyodbc://grimm:pass@localhost\SQLEXPRESS/GrimmDB?driver=ODBC+Driver+17+for+SQL+Server'