Question

try / except未捕获以下代码段中指定的pymssql异常：

import pandas as pd
from fps.databaseconnections import DatabaseConnections
from pymssql import ProgrammingError

DatabaseConnections_instance = DatabaseConnections()
db_cnxn = DatabaseConnections_instance.get_connection("gtaemndprod")

print "\ndb_cnxn is this class: {}\n".format(db_cnxn.__class__)

try:
    pd.read_sql("SELECT blah",db_cnxn)
except ProgrammingError:
    print "A"

回溯：

db_cnxn is this class: <class 'sqlalchemy.engine.base.Engine'>

Traceback (most recent call last):

  File "<ipython-input-20-9e8944849cfd>", line 11, in <module>
pd.read_sql("SELECT blah",db_cnxn)

  File "C:\Users\212476924\AppData\Local\Continuum\Anaconda2\lib\site-packages\pandas\io\sql.py", line 515, in read_sql
chunksize=chunksize)

  File "C:\Users\212476924\AppData\Local\Continuum\Anaconda2\lib\site-packages\pandas\io\sql.py", line 1190, in read_query
result = self.execute(*args)

  File "C:\Users\212476924\AppData\Local\Continuum\Anaconda2\lib\site-packages\pandas\io\sql.py", line 1081, in execute
return self.connectable.execute(*args, **kwargs)

  File "C:\Users\212476924\AppData\Local\Continuum\Anaconda2\lib\site-packages\sqlalchemy\engine\base.py", line 1991, in execute
return connection.execute(statement, *multiparams, **params)

  File "C:\Users\212476924\AppData\Local\Continuum\Anaconda2\lib\site-packages\sqlalchemy\engine\base.py", line 906, in execute
return self._execute_text(object, multiparams, params)

  File "C:\Users\212476924\AppData\Local\Continuum\Anaconda2\lib\site-packages\sqlalchemy\engine\base.py", line 1054, in _execute_text
statement, parameters

  File "C:\Users\212476924\AppData\Local\Continuum\Anaconda2\lib\site-packages\sqlalchemy\engine\base.py", line 1146, in _execute_context
context)

  File "C:\Users\212476924\AppData\Local\Continuum\Anaconda2\lib\site-packages\sqlalchemy\engine\base.py", line 1341, in _handle_dbapi_exception
exc_info

  File "C:\Users\212476924\AppData\Local\Continuum\Anaconda2\lib\site-packages\sqlalchemy\util\compat.py", line 202, in raise_from_cause
reraise(type(exception), exception, tb=exc_tb, cause=cause)

  File "C:\Users\212476924\AppData\Local\Continuum\Anaconda2\lib\site-packages\sqlalchemy\engine\base.py", line 1139, in _execute_context
context)

  File "C:\Users\212476924\AppData\Local\Continuum\Anaconda2\lib\site-packages\sqlalchemy\engine\default.py", line 450, in do_execute
cursor.execute(statement, parameters)

  File "pymssql.pyx", line 464, in pymssql.Cursor.execute (pymssql.c:7491)

ProgrammingError: (pymssql.ProgrammingError) (207, "Invalid column name 'blah'.DB-Lib error message 20018, severity 16:\nGeneral SQL Server error: Check messages from the SQL Server\n") [SQL: 'SELECT blah']

DatabaseConnections类只是访问我需要使用的一些常用数据库的简单方法。它返回数据库连接引擎db_cnxn。正如您在回溯中看到的，这是一个sqlalchemy.engine.base.Engine对象。

如下所示导入整个pymssql包会产生相同的回溯：

import pandas as pd
from fps.databaseconnections import DatabaseConnections
import pymssql

DatabaseConnections_instance = DatabaseConnections()
db_cnxn = DatabaseConnections_instance.get_connection("gtaemndprod")

print "\ndb_cnxn is this class: {}\n".format(db_cnxn.__class__)

try:
    pd.read_sql("SELECT blah",db_cnxn)
except pymssql.ProgrammingError:
    print "A"

请帮忙！谢谢。

Answer 1

由于您使用sqlalchemy，这是您感兴趣的，而不是pymssql：

from sqlalchemy.exc import ProgrammingError

Python无法捕获pymssql异常

1 个答案: