空变量 $name

Question

我对 db 有一个请求：

$str = "SELECT name FROM `student_info` WHERE code='$code'"; 
$name = $link->query($str) or die(mysqli_error($link)); 

$name 不返回任何内容

this is a structure of a student_info table

请帮忙！

Answer 1

试试这个

$sql = "SELECT name FROM student_info WHERE code='$code'";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    $row = $result->fetch_assoc();
     $name =  $row["name"];
    }