Question

我在文档根目录之外的includes文件夹中设置了dbconn.php文件。当我从它引用$ mysqli作为select语句的一部分时，我收到错误

Warning: mysqli_query() [function.mysqli-query]: Couldn't fetch mysqli     
in /home/tgitcorp/public_html/Admin/admin_index.php on line 18
Warning: mysqli_fetch_array() expects parameter 1 to be mysqli_result, null given 
in /home/tgitcorp/public_html/Admin/admin_index.php on line 20

我的dbconn.php如下：

<?php
    $mysqli = new mysqli('localhost','dbuser','pass','dbname');
    if ($mysqli->connect_error){
        die('Connect Error (' . $mysqli_connect_errno . ')'. $mysqli->connect_error);
    }
    $mysqli->close();   
?>

这是我的代码：

<?php 
include_once '/home/tgitcorp/includes/dbconn.php';
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML     
1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <meta content="text/html; charset=utf-8" http-equiv="Content-Type" />
    <title>Tricorp Job Listing Admin Panel</title>
    <link rel="stylesheet" href="../css/style.css" type="text/css"/>
</head>
<body>
    <h1>Job Listing Administration</h1>
    <h2>Step 1:  Please Select Your Restaurant</h2>
    <form id="frmSelStore" method="post">
    <?php 
    $result=mysqli_query($mysqli,'SELECT location from restaurant');
    echo '<select name="ddlStore">';
    while($row=mysqli_fetch_array($result))
    {
        echo '<option value="' . htmlspecialchars($row['location']) . '"></option>';
    }
    echo '</select>';
    ?>
    </form>
</body>
</html>

我想查询餐馆餐桌以检索位置字段，并在我的下拉框中将该字段填充为值。任何人都可以协助解决此错误吗？

谢谢！

更新＃2：修改后的代码块：

<?php 
$result=$mysqli->query($mysqli,'SELECT location from restaurant');
echo '<select name="ddlStore">';
while($row=$mysqli->query($result))
{
    echo '<option value="' . htmlspecialchars($row['location']) . '">';
    '</option>';
}
echo '</select>';
?>

产生错误消息：

Warning: mysqli::query() expects parameter 1 to be string, object given 
in /home/tgitcorp/public_html/Admin/admin_index.php on line 18
Warning: mysqli::query() [mysqli.query]: Empty query 
in /home/tgitcorp/public_html/Admin/admin_index.php on line 20

Answer 1

为什么在实例化后立即关闭连接？它必须与此有关。听我说$mysqli->close()属于if区块。

编辑：在任何情况下，关闭连接都是可选的，如下所述：http://php.about.com/od/phpfunctions/qt/mysql_close.htm

MYSQLi_Query无法使用包含文件夹中的数据库连接

1 个答案: