php - SELECT Query, WHERE selects all when "" is empty -


the aim

hi, i'm trying shorten code building query dynamically based on $_get. current have every possible if statement relevant select query. create dynamic system feature updates.

current progress

//set filter based on url         if ($_get[game] != "") { $gamefilter = $_get[game]; } else { $gamefilter = ''; }         if ($_get[region] != "") { $regionfilter = $_get[region]; } else { $regionfilter = ''; }         if ($_get[console] != "") { $consolefilter = $_get[console]; } else { $consolefilter = ''; }      $result = get_matchfinder($gamefilter, $regionfilter, $consolefilter);

//the function

function get_matchfinder($gamefilter, $regionfilter, $consolefilter) {         //set varibles         $database = 'matchfinder';         $order = 'desc';         $limit = '20';      //query function     $connection = connection();     $sql = 'select *  '. $database .' game = "'.$gamefilter.'" , region = "'.$regionfilter.'" , console = "'.$consolefilter.'" order id '. $order .' limit '. $limit .'';     $response = mysqli_query($connection, $sql);         //return     return $response; }

problem currenly works when of filters active if 1 of them isn't whole query fails, know thats because try select matching ''.

so questions how make search when filters not set?

you should build query parts depending on length of filter:

$sql = '     select * '.$database.' ';  $filters = array(); if (strlen($gamefilter) > 0) {     $filters[] = 'game = "'.mysqli_escape_string($connection, $gamefilter).'"'; } if (strlen($regionfilter) > 0) {     $filters[] = 'region = "'.mysqli_escape_string($connection, $regionfilter).'"'; } if (strlen($consolefilter ) > 0) {     $filters[] = 'console= "'.mysqli_escape_string($connection, $consolefilter).'"'; }  if (count($filters) > 0) {     $sql .= ' '.implode(' , ', $filters); }  if (strlen($oder) > 0) {     $sql .= ' order id '.$order; } if ($limit > 0) {     $sql .= ' limit '.$limit; }  $response = mysqli_query($connection, $sql);

what you're doing there building array of conditions, based on length of condition. if condition's input empty string, isn't added array. @ end, if there filters, use implode bind conditions string. way implode works, if there's 1 condition, glue string isn't used.

it bears mentioning exposing sql injection. above code shows use of mysqli_escape_string escape input, should in parameterized queries take full precaution: http://php.net/manual/en/mysqli.quickstart.prepared-statements.php -- above sample different if used paraterized queries, more safe.

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