Re: Interactive querys

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The idea is nice. I am using similiar technique in my work, but you commited
some mistakes in the code. It may cause some anger/frustration amongst newbie
ones. :-)

ripley(at)gazeta(dot)pl (pon 22. grudzień 2003 11:46):
> ------ Wiadomość oryginalna ------
> Od: Ângelo Marcos Rigo <angelo_rigo(at)yahoo(dot)com(dot)br>
> Data: 2003-12-15 14:23
>
> Temat: Re: [PHP] Interactive querys
[...]
> 2. Second - you have only to build your query string - using
> conditions "if..." :
>
> start with:
>
> $query_str = "select ";
>
> if ($_POST["id_chbox"] = 1)

It sets the value of possibly non-existing $_POST["id_chbox"] to 1, that
expression is evaluated as TRUE, thus the following is always executed.

> $query_str += $_POST["id_chbox"];

You, probably, wanted to say: $query_str .= ' id';

> if ($_POST["name_chbox"] = 1)
> $query_str += ", ".$_POST["id_name"];

Same here... == instead of =, and .= instead of += and ' name' instead of
$_POST['id_name'];

Also, real code should check whether any field has been already inserted in
the $query_str before the comma will be used as separator.

> ..............
>
> and so on
>
> You can also try to make this script "universal" by using iterations
> through $_POST variables - its possible to write something like
>
> for ($n=0; n < ...;$n++)
> {
> $_POST[$cols[$n]."_chbox"]............
> }
>
> The only minus of this method is that it can take some time :)

A few dozens of iterations should be pretty fast. And this method is more
'elegant' than linear - if( x==1)... else if( x==2) ... else if( x==3).. way.

>
> I hope it helps
> Asia Sledzik

Me too... ;-)
Mariusz
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