[dev] [cvs] commit: turba/lib Driver.php api.php turba/lib/Driver sql.php

[Michael Rubinsky]

Quoting Jan Schneider <jan at horde.org>:

> Zitat von Michael Rubinsky <mike at theupstairsroom.com>:
>
>> Quoting Jan Schneider <jan at horde.org>:
>>
>>> Zitat von Michael Rubinsky <mike at theupstairsroom.com>:
>>>
>>>> Quoting Jan Schneider <jan at horde.org>:
>>>>
>>>>> jan         2007-10-29 11:21:28 EDT
>>>>>
>>>>>   Modified files:
>>>>>     lib                  Driver.php api.php
>>>>>     lib/Driver           sql.php
>>>>>   Log:
>>>>>   Catch errors.
>>>>>   Fix query generation.
>>>>>   Use ANSI SQL (works fine with DATE columns in MySQL too btw).
>>>>>   Simplify code.
>>>>
>>>>
>>>> I was under the impression that not all RDBMS actually implemented the
>>>> ANSI version of the substring() command.  In particular (at least some
>>>> versions of) MS SQL implement it in the (string, from, to) kind of way.
>>>
>>> That sucks. Does that mean that not all RDMBS implement the ANSI
>>> version, but all implement a non-standard version that works
>>> everywhere the same? I wonder what standards are for.
>>
>> Yea, what we need are better standards for implementing standards :)
>> Anyway, the substr() version was the only one that I found that works
>> the same across the different servers I checked the manual for.  MS
>> SQL and Oracle (at least according to the text I have here at home)
>> both do not implenet the substring() function. I think MS SQL aliases
>> substring() to substr(), but it still only accepts the (string, from,
>> to) parameters.  MySQL I believe accepts both versions. PostgreSQL
>> accepts the ANSI form, but translates it the substr() function with
>> the three parameters...and DB2 takes the three parameters as
>> well...but I don't remember if it also take the ANSI version.
>
> Okay, I'm gonna revert this then. Do you know if at least all substr()
> implementations consider the third parameter as the substring length,
> opposed to the substring end? I would feel more confident if we could
> make sure to really compare 5-character substrings against 5-character
> string constants.

I believe that they were. The len parameter was also optional in all  
of them IIRC as well.



>
> Jan.
>
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Thanks,
mike

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