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使用 python/SQLAlchemy 连接到 DB2 时出错：不支持“0x0000”参数值“0x0000”。 SQLSTATE=58017

[英]Error connecting to DB2 with python/SQLAlchemy: “0x0000” Parameter value “0x0000” is not supported. SQLSTATE=58017

 原文  2018-01-08 21:37:06  8   2    python/ sqlalchemy/ db2

问题描述

I'm trying to connect to a db2 database via SQLAlchemy using the following script: (Windows 7 x64, Python 3.6 using libraries: ibm_db_sa, and ibm_db_2.0.8a, DB2 on z/OS)我正在尝试使用以下脚本通过 SQLAlchemy 连接到 db2 数据库：（Windows 7 x64，使用库的 Python 3.6：ibm_db_sa 和 ibm_db_2.0.8a，z/OS 上的 DB2）

import traceback
import ibm_db_sa
from sqlalchemy import create_engine
from sqlalchemy.ext.automap import automap_base
from sqlalchemy.orm import scoped_session, sessionmaker

if __name__ == '__main__':
    try:
        Base = automap_base()
        connection_string = 'db2+ibm_db://userName:Password@Server.com:6001/DB_0;'
        engine = create_engine(connection_string)
        session = scoped_session(sessionmaker(autocommit=False,
                                              autoflush=False,
                                              bind=engine))
        # reflect the tables
        Base.prepare(engine, reflect=True)
        base_sa = Base.classes

    except Exception as err:
        print(traceback.format_exc())
        engine.close()

Unfortunately I'm getting the below traceback/error on the Base.prepare(engine, reflect=True) line .不幸的是，我在Base.prepare(engine, reflect=True) 行上收到以下回溯/错误。 This is a proof of concept code to test if I can indeed connect to a db2 database and reflect tables using SQLAlchemy.这是一个概念验证代码，用于测试我是否确实可以连接到 db2 数据库并使用 SQLAlchemy 反映表。

I have also tried to run a raw SQL statement instead of reflecting that has had the same outcome:我还尝试运行原始 SQL 语句，而不是反映具有相同结果的语句：

result = engine.execute(r'SELECT * FROM fooschema.footable;')

TRACEBACK:追溯：

Connected to pydev debugger (build 171.4694.67)
Traceback (most recent call last):
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\pool.py", line 1122, in _do_get
    return self._pool.get(wait, self._timeout)
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\util\queue.py", line 145, in get
    raise Empty
sqlalchemy.util.queue.Empty

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\ibm_db_dbi.py", line 592, in connect
    conn = ibm_db.connect(dsn, '', '', conn_options)
 SQLCODE=-30073

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\engine\base.py", line 2147, in _wrap_pool_connect
    return fn()
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\pool.py", line 328, in unique_connection
    return _ConnectionFairy._checkout(self)
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\pool.py", line 766, in _checkout
    fairy = _ConnectionRecord.checkout(pool)
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\pool.py", line 516, in checkout
    rec = pool._do_get()
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\pool.py", line 1138, in _do_get
    self._dec_overflow()
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\util\langhelpers.py", line 66, in __exit__
    compat.reraise(exc_type, exc_value, exc_tb)
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\util\compat.py", line 187, in reraise
    raise value
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\pool.py", line 1135, in _do_get
    return self._create_connection()
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\pool.py", line 333, in _create_connection
    return _ConnectionRecord(self)
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\pool.py", line 461, in __init__
    self.__connect(first_connect_check=True)
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\pool.py", line 651, in __connect
    connection = pool._invoke_creator(self)
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\engine\strategies.py", line 105, in connect
    return dialect.connect(*cargs, **cparams)
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\engine\default.py", line 393, in connect
    return self.dbapi.connect(*cargs, **cparams)
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\ibm_db_dbi.py", line 595, in connect
    raise _get_exception(inst)
ibm_db_dbi.ProgrammingError: ibm_db_dbi::ProgrammingError: [IBM][CLI Driver] SQL30073N  "0x0000" Parameter value "0x0000" is not supported.  SQLSTATE=58017\r SQLCODE=-30073

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "C:/Users/1234567890/Documents/cool_app/db2_is_working.py", line 18, in <module>
    Base.prepare(engine, reflect=True)
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\ext\automap.py", line 753, in prepare
    autoload_replace=False
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\sql\schema.py", line 3840, in reflect
    with bind.connect() as conn:
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\engine\base.py", line 2091, in connect
    return self._connection_cls(self, **kwargs)
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\engine\base.py", line 90, in __init__
    if connection is not None else engine.raw_connection()
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\engine\base.py", line 2177, in raw_connection
    self.pool.unique_connection, _connection)
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\engine\base.py", line 2151, in _wrap_pool_connect
    e, dialect, self)
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\engine\base.py", line 1465, in _handle_dbapi_exception_noconnection
    exc_info
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\util\compat.py", line 203, in raise_from_cause
    reraise(type(exception), exception, tb=exc_tb, cause=cause)
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\util\compat.py", line 186, in reraise
    raise value.with_traceback(tb)
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\engine\base.py", line 2147, in _wrap_pool_connect
    return fn()
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\pool.py", line 328, in unique_connection
    return _ConnectionFairy._checkout(self)
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\pool.py", line 766, in _checkout
    fairy = _ConnectionRecord.checkout(pool)
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\pool.py", line 516, in checkout
    rec = pool._do_get()
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\pool.py", line 1138, in _do_get
    self._dec_overflow()
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\util\langhelpers.py", line 66, in __exit__
    compat.reraise(exc_type, exc_value, exc_tb)
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\util\compat.py", line 187, in reraise
    raise value
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\pool.py", line 1135, in _do_get
    return self._create_connection()
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\pool.py", line 333, in _create_connection
    return _ConnectionRecord(self)
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\pool.py", line 461, in __init__
    self.__connect(first_connect_check=True)
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\pool.py", line 651, in __connect
    connection = pool._invoke_creator(self)
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\engine\strategies.py", line 105, in connect
    return dialect.connect(*cargs, **cparams)
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\engine\default.py", line 393, in connect
    return self.dbapi.connect(*cargs, **cparams)
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\ibm_db_dbi.py", line 595, in connect
    raise _get_exception(inst)
sqlalchemy.exc.ProgrammingError: (ibm_db_dbi.ProgrammingError) ibm_db_dbi::ProgrammingError: [IBM][CLI Driver] SQL30073N  "0x0000" Parameter value "0x0000" is not supported.  SQLSTATE=58017\r SQLCODE=-30073

Traceback (most recent call last):
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\pool.py", line 1122, in _do_get
    return self._pool.get(wait, self._timeout)
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\util\queue.py", line 145, in get
    raise Empty
sqlalchemy.util.queue.Empty

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\ibm_db_dbi.py", line 592, in connect
    conn = ibm_db.connect(dsn, '', '', conn_options)
 SQLCODE=-30073

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\engine\base.py", line 2147, in _wrap_pool_connect
    return fn()
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\pool.py", line 328, in unique_connection
    return _ConnectionFairy._checkout(self)
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\pool.py", line 766, in _checkout
    fairy = _ConnectionRecord.checkout(pool)
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\pool.py", line 516, in checkout
    rec = pool._do_get()
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\pool.py", line 1138, in _do_get
    self._dec_overflow()
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\util\langhelpers.py", line 66, in __exit__
    compat.reraise(exc_type, exc_value, exc_tb)
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\util\compat.py", line 187, in reraise
    raise value
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\pool.py", line 1135, in _do_get
    return self._create_connection()
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\pool.py", line 333, in _create_connection
    return _ConnectionRecord(self)
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\pool.py", line 461, in __init__
    self.__connect(first_connect_check=True)
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\pool.py", line 651, in __connect
    connection = pool._invoke_creator(self)
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\engine\strategies.py", line 105, in connect
    return dialect.connect(*cargs, **cparams)
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\engine\default.py", line 393, in connect
    return self.dbapi.connect(*cargs, **cparams)
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\ibm_db_dbi.py", line 595, in connect
    raise _get_exception(inst)
ibm_db_dbi.ProgrammingError: ibm_db_dbi::ProgrammingError: [IBM][CLI Driver] SQL30073N  "0x0000" Parameter value "0x0000" is not supported.  SQLSTATE=58017\r SQLCODE=-30073

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "C:/Users/1234567890/Documents/cool_app/db2_is_working.py", line 18, in <module>
    Base.prepare(engine, reflect=True)
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\ext\automap.py", line 753, in prepare
    autoload_replace=False
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\sql\schema.py", line 3840, in reflect
    with bind.connect() as conn:
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\engine\base.py", line 2091, in connect
    return self._connection_cls(self, **kwargs)
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\engine\base.py", line 90, in __init__
    if connection is not None else engine.raw_connection()
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\engine\base.py", line 2177, in raw_connection
    self.pool.unique_connection, _connection)
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\engine\base.py", line 2151, in _wrap_pool_connect
    e, dialect, self)
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\engine\base.py", line 1465, in _handle_dbapi_exception_noconnection
    exc_info
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\util\compat.py", line 203, in raise_from_cause
    reraise(type(exception), exception, tb=exc_tb, cause=cause)
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\util\compat.py", line 186, in reraise
    raise value.with_traceback(tb)
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\engine\base.py", line 2147, in _wrap_pool_connect
    return fn()
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\pool.py", line 328, in unique_connection
    return _ConnectionFairy._checkout(self)
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\pool.py", line 766, in _checkout
    fairy = _ConnectionRecord.checkout(pool)
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\pool.py", line 516, in checkout
    rec = pool._do_get()
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\pool.py", line 1138, in _do_get
    self._dec_overflow()
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\util\langhelpers.py", line 66, in __exit__
    compat.reraise(exc_type, exc_value, exc_tb)
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\util\compat.py", line 187, in reraise
    raise value
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\pool.py", line 1135, in _do_get
    return self._create_connection()
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\pool.py", line 333, in _create_connection
    return _ConnectionRecord(self)
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\pool.py", line 461, in __init__
    self.__connect(first_connect_check=True)
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\pool.py", line 651, in __connect
    connection = pool._invoke_creator(self)
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\engine\strategies.py", line 105, in connect
    return dialect.connect(*cargs, **cparams)
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\sqlalchemy\engine\default.py", line 393, in connect
    return self.dbapi.connect(*cargs, **cparams)
  File "C:\Users\1234567890\Documents\cool_app\.env\lib\site-packages\ibm_db_dbi.py", line 595, in connect
    raise _get_exception(inst)
sqlalchemy.exc.ProgrammingError: (ibm_db_dbi.ProgrammingError) ibm_db_dbi::ProgrammingError: [IBM][CLI Driver] SQL30073N  "0x0000" Parameter value "0x0000" is not supported.  SQLSTATE=58017\r SQLCODE=-30073

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\Users\1234567890\AppData\Roaming\JetBrains\PyCharm 2017.1.4\helpers\pydev\pydevd.py", line 1591, in <module>
    globals = debugger.run(setup['file'], None, None, is_module)
  File "C:\Users\1234567890\AppData\Roaming\JetBrains\PyCharm 2017.1.4\helpers\pydev\pydevd.py", line 1018, in run
    pydev_imports.execfile(file, globals, locals)  # execute the script
  File "C:\Users\1234567890\AppData\Roaming\JetBrains\PyCharm 2017.1.4\helpers\pydev\_pydev_imps\_pydev_execfile.py", line 18, in execfile
    exec(compile(contents+"\n", file, 'exec'), glob, loc)
  File "C:/Users/1234567890/Documents/cool_app/db2_is_working.py", line 23, in <module>
    engine.close()
AttributeError: 'Engine' object has no attribute 'close'

2 个解决方案

解决方案1
 0 已采纳  2018-01-18 14:56:53

The issue was that I didn't have the correct host/user/password.问题是我没有正确的主机/用户/密码。 I resolved the issue by creating a DSN, testing the connection and then using pyodbc to connect.我通过创建 DSN、测试连接然后使用 pyodbc 进行连接来解决该问题。 I still haven't been able to get SQLAlchemy to work with the connection but will post a separate question for that.我仍然无法让 SQLAlchemy 使用连接，但会为此发布一个单独的问题。

Update: DB2 on z/OS is currently not supported by SQLAlchemy.更新：SQLAlchemy 目前不支持 z/OS 上的 DB2。

解决方案2
 0  2020-08-03 05:42:07

As of Aug, 2020 SqlAlchemy supports IBM_db and I am able to successfully connect and retrieve data on Z/OS截至 2020 年 8 月，SqlAlchemy 支持 IBM_db，我能够在 Z/OS 上成功连接和检索数据

from sqlalchemy import Column, Integer, String, MetaData
from sqlalchemy import create_engine
engine = create_engine("db2+ibm_db://userId:password@host:port/db") #create a database engine
from sqlalchemy.ext.declarative import declarative_base
metadata = MetaData(schema='schemaName')
Base = declarative_base(bind=engine, metadata=metadata)

class Customers(Base):
   __tablename__ = 'tableName'
   CLIENT_ID = Column(Integer, primary_key=True)
   CLIENT_NAME = Column(Integer)
   CREATED_BY = Column(String)

from sqlalchemy.orm import sessionmaker
Session = sessionmaker(bind = engine)
session = Session()
result = session.query(Customers).limit(2)

for row in result:
   print (row.CLIENT_NAME )

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