您好這聽起來很容易,但事情似乎是錯在這裏,選擇5類
include_once('class.DBconnnection.php');//connects to DB and works fine
class execute extends db
{
private $sqlString;
private $selected;
private $querySelected;
public function select($sqlString)
{
$connection=$this->getConnection();
$querySelected=$connection->query($sqlString);
if($querySelected->num_rows>0){
$this->Fetch();
}
else{
echo'No Data Available';
}
}
public function Fetch(){
return $querySelected->fetch_array();
}
}
上運行implimenting上面的類
try{
$connect=db::getInstance();
$conn=$connect->getConnection();
$execute=new execute();
$execute->select('select * from users limit 5');
while($execute->Fetch()){
echo $row['username'].'<br/>';
}
}
catch(Exception $e){
echo $e->getMessage();
}
我收到的錯誤:Fatal error: Call to a member function fetch_array() on a non-object in C:\wamp\www\PHP5_Testing\classes\class.execute.php on line 20
任何人都可以幫助我解決這個問題嗎?當我使用程序mysqli它工作正常,但問題現在與oop mysqli
要設置一個類屬性,你必須使用'$ this-> querySelected' – Neat
這是因爲在'return $ querySelected-> fetch_array();''querySelected'不是一個對象,它的未定義變量 –