Create a dynamic mysql query using php variables

Question

I have an html table that loads everything in a mySQL database table. I have dropdowns that relate to columns of that mySQL table - when the user selects one of the dropdow

Answer 1

Just check if the variables contain a value and if they do, build the query like so:

unset($sql);

if ($stationFilter) {
    $sql[] = " STATION_NETWORK = '$stationFilter' ";
}
if ($verticalFilter) {
    $sql[] = " VERTICAL = '$verticalFilter' ";
}

$query = "SELECT * FROM $tableName";

if (!empty($sql)) {
    $query .= ' WHERE ' . implode(' AND ', $sql);
}

echo $query;
// mysql_query($query);

Answer 2

$filter = array();

if ($_GET['station'] != '')
{ $filter[] = 'STATION_NETWORK = '.$_GET['station'];}
if ($_GET['vertical'] != '')
{ $filter[] = 'VERTICAL = '.$_GET['vertical'];}
if ($_GET['creative'] != '')
{ $filter[] = 'CREATIVE  = '.$_GET['creative'];}
if ($_GET['week'] != '')
{ $filter[] = 'WK = '.$_GET['week'];}

$query = 'SELECT * FROM $tableName WHERE '.implode(' AND ', $filter);
$result = mysql_query($query);
... 

but better if in GET you pushed name of tables rows; $_GET['STATION_NETWORK'] --- some like this;

then you make
foreach ($_GET as $key => $value)
{
    if ($value != '')
    { $filter[] = $key.' = '.$value;}
}

or try

$filter = array('STANTION_NETWORK' => $_GET['station'],
                'VERTICAL' => $_GET['vertical'],
                 'CREATIVE'  => $_GET['creative'],
                 'WK' => $_GET['week']);
$query_array = array();

 foreach ($filter as $key => $value)
{
    if ($value != '')
    { $query_array[] = $key.' = '.$value;}
}
$query = 'SELECT * FROM $tableName WHERE '.implode(' AND ', $query_array);
$result = mysql_query($query);