Question

This is my first post here.

I have been reading posts here since I started learning python and it has been nothing but a great help to my learning process. So, just want to say A BIG THANK YOU to you all before my question!

Question:

I installed the cjklib package successfully. Then, I installed the CEDICT dictionary successfully as well. But when I try to use CEDICT, it always throws errors like this:

>>> d = CEDICT()
......
  File "build/bdist.linux-x86_64/egg/sqlalchemy/engine/default.py", line 335, in do_execute
sqlalchemy.exc.OperationalError: (OperationalError) unknown database "cedict_0" 'PRAGMA "cedict_0".table_info("CEDICT")' ()
>>> 

To reproduce the problem:

Install the cjklib package:

Download the cjklib-0.3.tar.gz, extract it and update the files in directory Cjklib-0.3/cjklib/build/*.py (specifically, builder.py and init.py):

Update “from sqlalchemy.exceptions” to “from sqlalchemy.exc”

$cd djklib-0.3/cjklib/build/
$sudo python setup.py install
$sudo installcjkdict CEDICT
$python
Python 2.7.3 (default, Apr 20 2012, 22:39:59) 
[GCC 4.6.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> from cjklib.dictionary import CEDICT
>>> d = CEDICT()

The error occurs, in details, as below:

>>> d = CEDICT()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python2.7/dist-packages/cjklib/dictionary/__init__.py", line 605, in __init__
    super(CEDICT, self).__init__(**options)
  File "/usr/local/lib/python2.7/dist-packages/cjklib/dictionary/__init__.py", line 532, in __init__
    super(EDICTStyleEnhancedReadingDictionary, self).__init__(**options)
  File "/usr/local/lib/python2.7/dist-packages/cjklib/dictionary/__init__.py", line 269, in __init__
    if not self.available(self.db):
  File "/usr/local/lib/python2.7/dist-packages/cjklib/dictionary/__init__.py", line 276, in available
    and dbConnectInst.hasTable(cls.DICTIONARY_TABLE))
  File "/usr/local/lib/python2.7/dist-packages/cjklib/dbconnector.py", line 444, in hasTable
    schema = self._findTable(tableName)
  File "/usr/local/lib/python2.7/dist-packages/cjklib/dbconnector.py", line 429, in _findTable
    if hasTable(tableName, schema=schema):
  File "build/bdist.linux-x86_64/egg/sqlalchemy/engine/base.py", line 2525, in has_table
  File "build/bdist.linux-x86_64/egg/sqlalchemy/engine/base.py", line 2412, in run_callable
  File "build/bdist.linux-x86_64/egg/sqlalchemy/engine/base.py", line 1959, in run_callable
  File "build/bdist.linux-x86_64/egg/sqlalchemy/dialects/sqlite/base.py", line 567, in has_table
  File "build/bdist.linux-x86_64/egg/sqlalchemy/engine/base.py", line 1450, in execute
  File "build/bdist.linux-x86_64/egg/sqlalchemy/engine/base.py", line 1627, in _execute_text
  File "build/bdist.linux-x86_64/egg/sqlalchemy/engine/base.py", line 1697, in _execute_context
  File "build/bdist.linux-x86_64/egg/sqlalchemy/engine/base.py", line 1690, in _execute_context
  File "build/bdist.linux-x86_64/egg/sqlalchemy/engine/default.py", line 335, in do_execute
sqlalchemy.exc.OperationalError: (OperationalError) unknown database "cedict_0" 'PRAGMA "cedict_0".table_info("CEDICT")' ()
>>>

Tryouts:
I tried some solutions myself, like:

As the error indicated, it can’t find the table in the sqlite database file, so I edited the cjklib.conf file by adding following the line to tell it that the table is right here:

url = sqlite:////usr/local/share/cjklib/cedict.db

Then, it found the table CEDICT and stopped throwing the errors. But unfortunately, it started throwing another kind of error when I ran the code below:

>>> from cjklib import characterlookup
>>> cjk = characterlookup.CharacterLookup('T')

Error:

>>> cjk = characterlookup.CharacterLookup('T')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python2.7/dist-packages/cjklib/characterlookup.py", line 118, in __init__
    self.hasComponentLookup = self.db.hasTable('ComponentLookup')
  File "/usr/local/lib/python2.7/dist-packages/cjklib/dbconnector.py", line 444, in hasTable
    schema = self._findTable(tableName)
  File "/usr/local/lib/python2.7/dist-packages/cjklib/dbconnector.py", line 429, in _findTable
    if hasTable(tableName, schema=schema):
  File "build/bdist.linux-x86_64/egg/sqlalchemy/engine/base.py", line 2525, in has_table
  File "build/bdist.linux-x86_64/egg/sqlalchemy/engine/base.py", line 2412, in run_callable
  File "build/bdist.linux-x86_64/egg/sqlalchemy/engine/base.py", line 1959, in run_callable
  File "build/bdist.linux-x86_64/egg/sqlalchemy/dialects/sqlite/base.py", line 567, in has_table
  File "build/bdist.linux-x86_64/egg/sqlalchemy/engine/base.py", line 1450, in execute
  File "build/bdist.linux-x86_64/egg/sqlalchemy/engine/base.py", line 1627, in _execute_text
  File "build/bdist.linux-x86_64/egg/sqlalchemy/engine/base.py", line 1697, in _execute_context
  File "build/bdist.linux-x86_64/egg/sqlalchemy/engine/base.py", line 1690, in _execute_context
  File "build/bdist.linux-x86_64/egg/sqlalchemy/engine/default.py", line 335, in do_execute
sqlalchemy.exc.OperationalError: (OperationalError) unknown database "cjklib_0" 'PRAGMA "cjklib_0".table_info("ComponentLookup")' ()

If i delete the line I added, it will work as expected again.

Solutions:

How can I make it read both cedict.db and cjklib.db at the same time? I am guessing, only then, it might work for both cases without throwing any errors.

Did anyone encounter a similar situation? And how did you solve it? Or, do you have anything else to try out in mind? Just shed some lights please!

Thanks in advance!

Answer 1

(1) Your method to make CEDICT work is not complete. Although “d = CEDICT()” doesn’t raise any error, you will meet an error when you a dictionary function, such as “d.getFor(u’朋友’)”. You should add an item in the config file:

attach = sqlite:////usr/local/share/cjklib/cjklib.db

But, this method still gives a “characterlookup” error (as you mentioned).

(2) Real solution: create “dbconnection” explicitly for the dictionary.

>>> from cjklib.dictionary import CEDICT
>>> from cjklib.dbconnector import getDBConnector
>>> db = getDBConnector({'sqlalchemy.url': 'sqlite://', 'attach': ['cjklib']})
>>> d=CEDICT(dbConnectInst=db)
>>> it=d.getFor(u'朋友')

EDIT:

Keep cjklib.conf with default configuration.