试图搜索ID并显示所选信息


Trying to search ID and Display selected information

我做了一个搜索框,你可以输入你想要获取的产品id。当我在产品id框中输入数据时,没有返回结果,有人知道我做错了什么吗?我认为'虽然($row = mysql_fetch_array($result)){'是错误的,但不太确定,因为我所尝试的一切都不起作用。

  <div class="searchbox">
    <form action="Search.php" method="get">
       <fieldset>
       <input name="search" id="search" placeholder="Search for a Product" type="text" />
         <input id="submit" type="button" />
      </fieldset>
    </form>
 </div>
 <div id="content">
 <ul>        
 <?php
 // connect to the database
    include('base.php');

 $search = mysql_real_escape_string($_GET['search']);
 $query = "SELECT * FROM Product WHERE ProductID LIKE '%{$search}%'";
 $result = mysql_query($query); 
 while ($row = mysql_fetch_array($result)) {
 echo "<li><span class='name'><b>{$row['ProductID']}</b></span></li>";
 }

不要使用mysql特有的语法,它已经过时了,以后会给你带来真正的麻烦,特别是当你决定使用sqlite或postgresql时。

使用PDO连接,您可以像这样初始化一个:

// Usage:   $db = connectToDatabase($dbHost, $dbName, $dbUsername, $dbPassword);
// Pre:     $dbHost is the database hostname, 
//          $dbName is the name of the database itself,
//          $dbUsername is the username to access the database,
//          $dbPassword is the password for the user of the database.
// Post:    $db is an PDO connection to the database, based on the input parameters.
function connectToDatabase($dbHost, $dbName, $dbUsername, $dbPassword)
{
    try
    {
         return new PDO("mysql:host=$dbHost;dbname=$dbName;charset=UTF-8", $dbUsername, $dbPassword);
    }
    catch(PDOException $PDOexception)
    {
        exit("<p>An error ocurred: Can't connect to database. </p><p>More preciesly: ". $PDOexception->getMessage(). "</p>");
    }
}

然后初始化变量:

$host = 'localhost';
$user = 'root';
$dataBaseName = 'databaseName';
$pass = '';

现在可以通过

访问数据库了
$db = connectToDatabase($host , $databaseName, $user, $pass); // You can make it be a global variable if you want to access it from somewhere else.

然后你应该确保你有变量:

$search = isset($_GET['search']) ? $_GET['search'] : false;

如果某些东西失败了,你可以跳过数据库。

if(!$search)
{
    //.. return some warning error.
}
else
{
    // Do what follows.
}

现在您应该构造一个可以用作准备查询的查询,也就是说,它接受准备好的语句,以便您准备查询,然后执行将被放入查询中执行的变量数组,同时避免sql注入:

$query = "SELECT * FROM Product WHERE ProductID LIKE :search;"; // Construct the query, making it accept a prepared variable search.
$statement = $db->prepare($query); // Prepare the query.
$statement->execute(array(':search' => $search)); // Here you insert the variable, by executing it 'into' the prepared query.
$statement->setFetchMode(PDO::FETCH_ASSOC); // Set the fetch mode.
while ($row = $statement->fetch())
{
    $productId = $row['ProductID'];
    echo "<li class='name><strong>$productId</strong></li>";
}

哦,是的,不要用b标签,它过时了。使用strong代替(使用font-weight: bold;在一个单独的CSS文件中。name。

如有不清楚之处,请随时提问。

删除$search前后的{}。

应:

$query = "SELECT * FROM Product WHERE ProductID LIKE '%$search%'";

您可以使用:

$result = mysql_query($query) or die($query."<br/><br/>".mysql_error());

确认数据正在返回。