數據庫鏈接 Mysqli

//數據庫鏈接 Mysqli$db= new Mysqli("localhost","root","root","asd_8080");//if ( !empty(mysqli_connect_error())){//   die("鏈接出錯");//}//$db->connect_error;//echo mysqli_connect_error();empty(mysqli_connect_error())?"":die("鏈接出錯");$sql = "select*from grad";$result = $db->query($sql);echo "<pre>";//var_dump($result->fetch_all());//索引數組形式的全部數據//var_dump($result->fetch_array());//索引和關聯數組形式的第一條//var_dump($result->fetch_assoc());//關聯數組形式的第一條數據//var_dump($result->fetch_object()->low);//一對象的形式的第一條數據//var_dump($result->field_count);//統計字段數//var_dump($result->fetch_field());//var_dump($result->fetch_row());//索引數組形式的第一條數據$arr=$result->fetch_all();foreach ($arr as $x){}