PHP Implode Associative Array

Question

So I'm trying to create a function that generates a SQL query string based on a multi dimensional array.

Example:

function createQueryString($arrayToSelect, $table, $conditionalArray) {
$queryStr = "SELECT ".implode(", ", $arrayToSelect)." FROM ".$table." WHERE ";
$queryStr = $queryStr.implode(" AND ",$conditionalArray); /*NEED HELP HERE*/
return $queryStr;
}

$columnsToSelect = array('ID','username');
$table = 'table';
$conditions = array('lastname'=>'doe','zipcode'=>'12345');
echo createQueryString($columnsToSelect, $table, $conditions); /*will result in incorrect SQL syntax*/

as you can see I need help with the 3rd line as it's currently printing

SELECT ID, username FROM table WHERE lastname AND zipcode

but it should be printing

SELECT ID, username FROM table WHERE lastname = 'doe' AND zipcode = '12345'

Answer 1

I know this is for the case of a pdo mysql type.. but what i do is build pdo wrapper methods, and in this case i do this function that helps to build the string, since we work with keys, there is no possible way to mysql inject, since i know the keys i define / accept manually.

imagine this data:

           $data=array(
            "name"=>$_GET["name"],
            "email"=>$_GET["email"]
);

you defined utils methods...

public static function serialize_type($obj,$mode){
$d2="";
if($mode=="insert"){
    $d2.=" (".implode(",",array_keys($obj)).") ";
    $d2.=" VALUES(";
foreach ($obj as $key=>$item){$d2.=":".$key.",";}
$d2=rtrim($d2,",").")";}

if($mode=="update"){
    foreach ($obj as $key=>$item){$d2.=$key."=:".$key.",";}    
}
return rtrim($d2,",");
}

then the query bind array builder ( i could use direct array reference but lets simplify):

  public static function bind_build($array){
     $query_array=$array;
     foreach ($query_array as $key => $value) { $query_array[":".$key] =   $query_array[$key]; unset($query_array[$key]); } //auto prepair array for PDO
return $query_array;    }

then you execute...

$query ="insert into table_x ".self::serialize_type( $data, "insert" );
$me->statement = @$me->dbh->prepare( $query ); 
$me->result=$me->statement->execute( self::bind_build($data) );

You could also go for an update easy with...

  $query ="update table_x set ".self::serialize_type( $data, "update" )." where id=:id";
    $me->statement = @$me->dbh->prepare( $query ); 

    $data["id"]="123"; //add the id 
    $me->result=$me->statement->execute( self::bind_build($data) );

But the most important part here is the serialize_type function

Answer 2

Here is a working version:

//use: implode_assoc($v,"="," / ")
//changed: argument order, when passing to function, and in function
//output: $_FILES array ... name=order_btn.jpg / type=image/jpeg / tmp_name=G:\wamp\tmp\phpBDC9.tmp / error=0 / size=0 / 

function implode_assoc($arr,$glue,$sep){
    $str = '';
    if (empty($glue)) {$glue='; ';}
    if (empty($sep)) {$sep=' = ';}
    if (is_array($arr))
    {
        foreach ($arr as $key=>$value)
        {
            $str .= $key.$glue.$value.$sep;
        }
        return $str;
    } else {
        return false;
    }
}

Answer 3

function implodeItem(&$item, $key) // Note the &$item
{
  $item = $key . "=" . $item;
}

[...]

$conditionals = array(
  "foo" => "bar"
);

array_walk($conditionals, "implodeItem");
implode(' AND ', $conditionals);

Untested, but something like this should work. This way you can also check if $item is an array and use IN for those cases.

Answer 4

You will have to write another function to process the $conditionalArray, i.e. processing the $key => $value and handling the types, e.g. applying quotes if they're string.

Are you just dealing with = condition? What about LIKE, <, >?

Answer 5

I use a variation of this:

function implode_assoc($glue,$sep,$arr)
{
    if (empty($glue)) {$glue='; ';}
    if (empty($sep)) {$sep=' = ';}
    if (is_array($arr))
    {
        foreach ($arr as $k=>$v)
        {
            $str .= $k.$sep.$v.$glue;
        }
        return $str;
    } else {
        return false;
    }
};

It's rough but works.

Answer 6

Try this

function GeraSQL($funcao, $tabela, $chave, $valor, $campos) {
    $SQL = '';

    if ($funcao == 'UPDATE') :
        //Formata SQL UPDATE

        $SQL  = "UPDATE $tabela SET ";
        foreach ($campos as $campo => $valor) :
            $SQL .= "$campo = '$valor', ";
        endforeach;
        $SQL  = substr($SQL, 0, -2);
        $SQL .= " WHERE $chave = '$valor' ";

    elseif ($funcao == 'INSERT') :
        //Formata SQL INSERT

        $SQL  = "INSERT INTO $tabela ";

        $SQL .= "(" . implode(", ", array_keys($campos) ) . ")";

        $SQL .= " VALUES ('" . implode("', '", $campos) . "')";         

    endif;

    return $SQL;
}

//Use
$data = array('NAME' => 'JOHN', 'EMAIL' => '[e-mail]');
GeraSQL('INSERT', 'Customers', 'CustID', 1000, $data);