Question

这是连接页面，它适用于我的索引文件。现在的问题是：我需要在另一个页面上运行另一个sql，它应该是这样的：SELECT * FROM products WHERE id = $var。但它给了我“mysqli_query（）：无法获取mysqli”当我尝试这样做时，我该怎么办？

connection.php

$host = "localhost";
$dbusername = "root";
$dbpassword = "";
$db = "movies";

//connecting to the database
$conn = mysqli_connect("$host","$dbusername","$dbpassword","$db");
mysqli_set_charset($conn,'utf8');

//check for error in connection
if (!$conn) {
  die ('Failed to connect to MySQL: ' . mysqli_connect_error());
}

//Selecting table and executing query
$sql = 'SELECT * FROM products';
$query = mysqli_query($conn, $sql);

if (!$query) {
  die ('SQL Error: ' . mysqli_error($conn));
}

mysqli_close($conn);

- 另一页 -

<?php

include "connection.php";

$movieid = $_GET['movieid'];

$sql = 'SELECT * FROM products WHERE id = "$movieid"';
$query = mysqli_query($conn, $sql);

$movie_title = $row['title'];
echo "$movie_title";
?>

Answer 1

出现此错误的原因是您正在关闭connenction.php文件上的连接。您只需删除此行：

mysqli_close($conn);

我收到这条消息，为什么？ mysqli_query（）：无法获取mysqli

1 个答案: