[Phpwm] MySQL case insensitive string comparison
Richard Cunningham
richard at richardcunningham.co.uk
Thu Jun 24 16:02:53 UTC 2010
What is the type of that column?
Mike Tipping wrote:
> Nope in my case LIKE is case sensitive.
>
> And my default collation is utf8_ci so it should follow that the collation
> is the same on the server and the table.
>
> It's very odd.
>
>
> On 24/06/2010 14:31, "Richard Cunningham" <richard at richardcunningham.co.uk>
> wrote:
>
>
>> LIKE is case insensitive in MySQL
>>
> mysql> SELECT 'mike' LIKE
>
>> 'MIKE';
>>
> +--------------------+
> | 'mike' LIKE 'MIKE' |
> +--------------------+
> |
>
>> 1 |
>>
> +--------------------+
> 1 row in set (0.00 sec)
>
> (though be sure to escape
>
>> %s and _s if it's user entered data for that
>>
> though)
>
>
> Doing the LOWER(name)
>
>> will stop MySQL using the index properly, since it
>>
> will have to do full
>
>> table/index scan to convert every name to lower
>>
> case before doing the
>
>> comparison.
>>
>
> Mike Tipping wrote:
>
>> There isn't a iLike in Mysql. :o(
>>
>> I¹ve
>> stated to use
>>
>> select * from table where lower(name) = lower(Œ$value¹)
>>
>>
>> Which works but that doesn¹t seem a very efficient way of tying to get
>> it to
>> behave as it should be behaving in the first place.
>>
>>
>>
>>
>> On 24/06/2010
>> 13:49, "Dan Dart" <dandart at googlemail.com> wrote:
>>
>> Have you tried using
>> the lower/upper/camel case instructions in
>> PHP to make MySQL see what
>> you want?
>>
>> Jolly confusing how it all seems to contradict itself.
>>
>>
>> On 24 Jun 2010 13:39, "Mike Tipping" <mike at etuna.co.uk> wrote:
>>
>>
>> Whenever I run a select in Mysql based on a string comparison, the
>>
>> comparison is always case sensitive so where 'name' in the DB
>> is
>> 'mike',
>> select * from table where name = 'MIKE'; won't return
>> results.
>>
>> Looking at the MySQL documentation it says that case
>>
>> sensitivity on
>> comparisons depends on the collation and if I use
>>
>> 'latin1_swedish_ci' (which
>> I do) the comparison will be case
>> insensitive (which it isn't).
>>
>> It also says that STRCMP() is by
>> default case insensitive, but
>> when I try
>> that it still
>> doesn't return anything.
>>
>> Any ideas what I might be doing wrong or
>> what I can use to do
>> a case
>> insensitive string comparison
>> in MySQL.
>>
>> Cheers
>>
>> Mike
>>
>>
>>
>>
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