How to select image from folder by name in mysql database

where is name of image

You should know. Where did you store it when uploading the image?

$image_name_from_db=get_image_name_from_db();
$images_dir=dir("url/images/dir");
while($nom = $images_dir->read ()){
     if($nom==$image_name_from_db){
      break; 
     }
}

<img src=<?php echo $name;?>  />

why you want to select image name from DB and search in dir ?
Idea : why you do not put the full path to your image in db then select it then use it, i think it well be more easy than your first idea !!!
hope this help.

if(!$v['mapImage'] == '')
                    {
                    //path folder name
                        echo '<img src="'.$v['mapPath'].'" width="600" height="450">';
                    }

another one is

if(!$v['mapImage'] == '')
                    {
                        echo '<img src="path/path1/'.$v['mapImage'].'" width="600" height="450">';
                    }

Thanks!