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From Jeff Butler <jeffgbut...@gmail.com>
Subject Re: DefaultSqlSession.selectOne()
Date Wed, 14 Apr 2010 15:19:41 GMT
http://opensource.atlassian.com/confluence/oss/display/IBATIS/Contribute+Documentation

Jeff Butler

On Wed, Apr 14, 2010 at 10:15 AM, cowwoc <cowwoc@bbs.darktech.org> wrote:
>
>    I don't mind using the workaround you outlined so long as it's mentioned
> in the iBatis 3 documentation. Right now it doesn't mention anything about
> the behavior of selectOne() or @Select returning a single value.
>
> Gili
>
> On 13/04/2010 8:59 PM, Clinton Begin wrote:
>>
>> The definition of null is the absence of value and meaning.  So
>> regardless of whether it's a null column or no rows, no meaning should
>> be applied to it.  Thus these cases are the same.
>>
>> If you want meaning to come from the row, return a value, perhaps the
>> row number.
>>
>> Clinton
>>
>> On 2010-04-13, cowwoc<cowwoc@bbs.darktech.org>  wrote:
>>
>>>
>>> Hi,
>>>
>>>      I hope I'm not reopening a hornet's nest but I just noticed the
>>> following comment in the code:
>>>
>>> // Popular vote was to return null on 0 results and throw exception on
>>> too many.
>>>
>>>      How do you differentiate between selectOne() returning null because
>>> it found no rows versus it finding a single row containing a null value?
>>> I remember Sun's Engineers had the same debate for auto-boxing (should a
>>> null Integer get unboxed as "0" or throw an exception?) and they settled
>>> on exceptions precisely because of this ambiguity. Was there a huge vote
>>> in favor of returning null for zero results or are you still open to
>>> some hand twisting? :)
>>>
>>> Gili
>>>
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>>>
>>>
>>
>>
>
>
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>

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