[Mapserver-users] Querybyattribute and drawquery problem

[Norbert Thieme]

Frank Broniewski schrieb:
> Hello List
> 
> I want to query a shapefile by some attribute stored in the shapefiles
> .dbf. I thought using queryByAttribute() might be the right function to
> use. My problem now is getting my query drawn.
> As far as I understand, queryByAttribute returns an integer as a result
> of the query. I used the following code to  draw the result but with no
> success:
> 
> 	$mySearchLayer = $MapObj->getLayerByName("Toponyme"); 
> 	$result =
> $mySearchLayer->queryByAttributes("toponyme",$searchitem,MS_SINGLE);
> 	$myresultImg = $MapObj->drawQuery($result);
> 	echo "<div id=\"error\"><img src=\"".$myresultImg."\"></div>";
> 
> I observed, that $myresultImg always is 0, nevertheless of the value of
> $searchitem. Even if I change $searchitem to a String like "Citie",
> querybyAttributes returns always 0.

Hi.

The QString must be exact the same in your table. Then you will get a 
result. But there could be some kind of not printed character in your 
dbf. You can use the PHP dbf functions or odbc functions to make a like 
query or something and then use the mapscript function with this output.

I think you shouldn't put the result in the drawquery because the mapobj 
draws the whole querycache.

Regards,
Norbert

> Then my next problem is: how do I draw the query? Is my method showed
> above correct, or what steps do I have to take? I already did some tests
> and the apache log showed me, that the number of parameters in the
> method drawQuery() is to small. When looking at the docs, I read
> imageObj image and I frankly have to admit, that I do not know, what to
> enter there.
> 
> Many Thanks in Advance for any help offered
> And greetings from Luxembourg
>                                                       
> Frank Broniewski
> Musée National d'Histoire et d'Art
> Section Préhistoire / Projet EPC
> 
> 
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