MySQL Connection / Prepared Statement Manager

class Connector
{
    public $ok;
    public $db;
    public $prepared;
    public function __construct(){
    // db should be a reasonable mysqli instance.
        $this->db = new mysqli("host","usename","password","default schema",port,"");
        $this->prepared = array();
    }


    public function prepare($name, $sql, $types, $fetch="none", $firstonly=false){     // fetch:none/one/assoc/flat/onecol/id
        $this->prepared[$name] = array($this->db->prepare($sql),$types,$fetch,$firstonly,$sql);
    }
    public function execute($name,$data=array()){
        if(!is_array($data)){
            $data = array($data);
        }
        $this->ok=true;
        $stmt = $this->prepared[$name][0];
        $type = $this->prepared[$name][1];
        $ftch = $this->prepared[$name][2];
        $frst = $this->prepared[$name][3];
        if (!is_object($stmt)) {
            $this->ok=false;
            return -1;
        }
        call_user_func_array('mysqli_stmt_bind_param', array_merge (array($stmt, $type), $data));
        $stmt->execute();
        if($stmt->error!=""){
            $this->ok=false;
            return -1;
        }
        if($ftch=="one" || $ftch=="assoc" || $ftch=="flat" || $ftch=="onecol"){
            $meta = $stmt->result_metadata();
            while ($field = $meta->fetch_field()) {
                $params[] = &$row[$field->name];
            }
            call_user_func_array(array($stmt, 'bind_result'), $params);
            $empty=true;
            while ($stmt->fetch()) {
                $c=array();
                foreach($row as $key => $val) {
                    $empty=false;
                    if($ftch=="assoc"){
                        $c[$key] = $val;
                    }else{
                        $c[] = $val;
                    }
                    if($ftch=="one"){
                        $stmt->free_result();
                        return $val;
                    }
                }
                if($frst)
                    return $c;
                if($ftch=="onecol")
                    $hits[] = $c[0];
                else
                    $hits[] = $c;
            }
            if($ftch=="id"){
                return $this->db->insert_id;
                }
            if($empty)
                return null;
            return $hits;
            $stmt->free_result();
        }
        return $this->db->insert_id;
    }
    public function describe(){
        $out = "";
        foreach($this->prepared as $key => $i){
            $out.= $key." = ".$i[4]." (".$i[1].") ";
            if($i[3]){
                if($i[2]=="flat"){
                    $out.="flat value list for first row";
                }else if($i[2]=="assoc"){
                    $out.="assoc key-value pairs for first row";
                }
            }else{
                if($i[2]=="flat"){
                    $out.="lflat value list for each row";
                }else if($i[2]=="assoc"){
                    $out.="assoc key-value pairs for each row";
                }else if($i[2]=="onecol"){
                    $out.="a single value for each row";
                }else{
                    $out.="no output";
                }
            }
            $out.="\n";
        }
        return $out;
    }


}