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Posted by Jerry Kita on 01/03/06 07:39
Man-wai Chang wrote:
> A table with a column big5 char(2) not null primary key.
>
> $target->query("delete from canton");
> for ($ii=0; $ii<256; $ii++) {
> for ($jj=0; $jj<256; $jj++) {
> echo $ii .".". $jj . "\n";
> $query="insert into canton ( big5 ) values ( '"
> . mysql_real_escape_string(chr($ii).chr($jj))
> . "' )";
> $target->query($query);
> }
> }
>
> The program died with this output:
>
> 0.92
> 0.93
> 0.94
> 0.95
> 0.96
> 0.97
> Duplicate entry '' for key 1
>
> The character strings shouldn't be repeated. Why did it stop at (0,97)?
>
Here's one thought ..... ascii (97) is the letter "a" .... is it
possible that the ascii (65) "A" was interpreted as lowercase thus
creating a duplicate primary key? Or your DBMS doesn't make a
distinction between upper or lower case.
--
Jerry Kita
http://www.salkehatchiehuntersville.com
email: jskita@attglobal.net
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