Re: [cx-oracle-users] Named Parameters Issue - ORA-01460: unimplemented or unreasonable conversion requested

[Amaury F. d'A. <ama...@gm...>]

Hi,

2013/4/3 Anurag Chourasia <anu...@gm...>

> Hi Joel,
>
> Yes. It is a 64 Bit Server using 32 Bit version of cx_Oracle.....Could
> that be a problem? Given that on the same server
>
> This 'Works Fine'
>
> cursor.execute("SELECT DISTINCT(TAG_STATUS) FROM TAG_HIST WHERE TAG_NBR = '%s' " %(TAG_NBR))
>
> ......but this 'Does Not'
>
> cursor.execute("SELECT DISTINCT(TAG_STATUS) FROM TAG_HIST WHERE TAG_NBR = :TAG_NBR " ,{'TAG_NBR':TAG_NBR})
>
>
What is the type of the TAG_NBR variable in Python?
And what is the type of the TAG_HIST.TAG_NBR column?


> Regards,
> Anurag
>
> On Wed, Apr 3, 2013 at 4:50 PM, Joel Slowik <js...@cp...> wrote:
>
>>  64-bit server but using 32-bit cx_oracle?
>>
>>
>>
>> *From:* Anurag Chourasia [mailto:anu...@gm...]
>> *Sent:* Wednesday, April 03, 2013 4:46 PM
>> *To:* cx-...@li...; re...@gm...
>> *Subject:* [cx-oracle-users] Named Parameters Issue - ORA-01460:
>> unimplemented or unreasonable conversion requested
>>
>>
>>
>> I have encountered a problem after implementing these changes (named
>> parameters in RAW SQL Queries as per Python DB-API) and I am without any
>> clue at the moment.
>>
>>
>>
>> These changes worked just fine on my Development Server
>>
>>    - Windows XP
>>    - Oracle XE SQL*Plus: Release 11.2.0.2.0
>>    - cx_Oracle-5.1.2-11g.win32-py2.7
>>
>>
>>
>> However, when deployed on my Client's Test Server, execution of all
>> queries fail with this error.
>>
>>    - Windows Server 2003
>>    - Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - 64bi
>>    - cx_Oracle-5.1.2-10g.win32-py2.7
>>
>>
>>
>> Traceback (most recent call last):
>>
>>   File "C:/Program Files/App_Logic/..\apps\views.py", line 400, in
>> regularize_TAG
>>
>>     T_cursor.execute("SELECT DISTINCT(TAG_STATUS) FROM TAG_HIST WHERE
>> TAG_NBR = :TAG_NBR " ,{'TAG_NBR':TAG_NBR})
>>
>> DatabaseError: ORA-01460: unimplemented or unreasonable conversion
>> requested
>>
>>
>>
>> Basically the following code "Works" on my clients machine
>>
>>     T_cursor.execute("SELECT DISTINCT(TAG_STATUS) FROM TAG_HIST WHERE
>> TAG_NBR = '%s' " %(TAG_NBR))
>>
>>
>>
>> But the following code "Does Not Work"
>>
>>     T_cursor.execute("SELECT DISTINCT(TAG_STATUS) FROM TAG_HIST WHERE
>> TAG_NBR = :TAG_NBR " ,{'TAG_NBR':TAG_NBR})
>>
>>
>>
>> Appreciate if someone could help me through this issue.
>>
>>
>>
>> Regards,
>>
>> Anurag
>>
>>
>>
>> On Tue, Apr 2, 2013 at 5:38 PM, Anurag Chourasia <
>> anu...@gm...> wrote:
>>
>> Thanks Jani...With that my issue is solved.
>>
>>
>>
>> Regards
>>
>> Guddu
>>
>>
>>
>> On Tue, Apr 2, 2013 at 1:35 AM, Jani Tiainen <re...@gm...> wrote:
>>
>> 2.4.2013 5:51, Anurag Chourasia kirjoitti:
>> > *Dear friends...Could you please help me with this issue?*
>> >
>> > *Steps to reproduce?*
>> > 1. Fetch the value of a varchar2 column that has Null as its current
>> value.
>> > 2. Use the fetched value to update any table's column.
>> >
>> > *Expected output?*
>> > Instead of updating to Null, the table column gets updated to a string
>> value of 'None'
>> >
>> > *Version in use*
>> > Python 2.7.3 (default, Apr 10 2012, 23:31:26) [MSC v.1500 32 bit
>> (Intel)] on win32
>> > cx_Oracle - 5.1.2
>> > Oracle 11G
>> >
>> > *Additional information*
>> >
>> > This could be because in the update query, I am using '%s'
>> format....for example
>> >
>> > cursor.execute("UPDATE EMP SET NAME='%s'" %(None))
>> >
>> > But there is no other way. If i simply use
>> >
>> > cursor.execute("UPDATE EMP SET NAME=%s" %(None)) then I get a syntax
>> error.
>> >
>> > There should be a way to update a column to NULL
>>
>> Why are you trying to inject data instead of using standard Python API
>> to do things right?
>>
>> If you persists constructing query string completely by hand (like you
>> have done), then you have to take care of NULL by yourself.
>>
>> In most cases following works better:
>>
>> cursor.execute('UPDATE EMP SET NAME=:arg1', {'arg1' : None })
>>
>> When you do it that way Python DB-API takes care of correct quotation
>> and makes sure that there is no way to inject malicious data and in most
>> cases correct datatype conversion takes a place (there is few occassions
>> when this fails)
>>
>> cx_Oracle doesn't support %s format, it supports only :name (named)
>> format [1].
>>
>> [1] http://www.python.org/dev/peps/pep-0249/#paramstyle
>> --
>> Jani Tiainen
>>
>> - Well planned is half done and a half done has been sufficient before...
>>
>>
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-- 
Amaury Forgeot d'Arc