Question

我正在做一个项目并需要一些帮助请:)（底部的完整代码）

需要使用PDO访问项目我需要将搜索结果显示在输入搜索的同一页面上。

以下对我来说似乎没有使用GET而不是POST ..这是正确的吗？这有效但我需要删除/隐藏我的页面（index.php）首次加载时出现的这段代码。

if(!isset($_GET['search']))
{   echo "Error, Please go back.";  exit;}

我该怎么做？

另外我的第二个问题是我无法通过搜索表单搜索表格中的多个字段。它只是不会让我。我不能使用这段代码

%'.$searchterm.'%

因为它不会从搜索中给我任何反馈。所以我正在使用

:searchterm

在

$searchterm = $_GET['search'];
$stmt = $conn->prepare("SELECT * FROM boxer WHERE weightclass LIKE :searchterm OR nationality ");
$stmt->bindValue(':searchterm','%'.$searchterm.'%');
$stmt->execute();

这是我的完整代码：

<?php

$servername = 'localhost';
$username = "root";
$password = "";
$dbname = "u1360138";

<?php
if(isset($_POST['search'])){
    echo 'Search';
}
?>


<!-- Search facility 1 -->
<form action="index.php" method="get">
<label for="search">Enter a weight class. Need to be more than one searchs which wont work</label>
<input type="text" name="search" id="search">
<input type="submit" value="Search">
</form>
<?php
// DB Connection
try {$conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);}
catch(PDOException $e)
{echo "Error conntecting to the DB: " . $e->getMessage();}
if(!isset($_GET['search']))
{   echo "Error, Please go back.";  exit;}
// DB Connection


$searchterm = $_GET['search'];
$stmt = $conn->prepare("SELECT * FROM boxer WHERE weightclass LIKE :searchterm");
$stmt->bindValue(':searchterm','%'.$searchterm.'%');
$stmt->execute();
// loop displays loop
while ($boxer = $stmt->fetch(PDO::FETCH_OBJ))
{ echo "<ul>";
echo "<a href='details.php?idboxer=".$boxer->idboxer."'>";
echo "<li>".$boxer->firstname." ".$boxer->lastname."</li>";
echo "</a>";
echo "</ul>"; }
$conn=NULL;
?>

Answer 1

在良好实践中，当用户向服务器发送内容以更改服务器上的数据时，使用POST发送参数（以db为例进行存储或发送电子邮件）。当用户从服务器中检索某些内容时，使用GET来读取数据（查询数据库）。所以更喜欢GET。

要解决您的问题，只需将处理研究的整个代码放在＆＃34; if（isset（$ _ GET [＆＃39; search＆＃39;]））{}＆＃34;部分如下：

<?php

$servername = 'localhost';
$username = "root";
$password = "";
$dbname = "u1360138";

<?php
if(isset($_GET['search'])){
    echo 'Search';
}
?>


<!-- Search facility 1 -->
<form action="index.php" method="get">
<label for="search">Enter a weight class. Need to be more than one searchs which wont work</label>
<input type="text" name="search" id="search">
<input type="submit" value="Search">
</form>
<?php

if(isset($_GET['search'])){
  // DB Connection
  try {$conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);}
  catch(PDOException $e)
  {echo "Error conntecting to the DB: " . $e->getMessage();}
  // DB Connection


  $searchterm = $_GET['search'];
  $stmt = $conn->prepare("SELECT * FROM boxer WHERE weightclass LIKE :searchterm");
  $stmt->bindValue(':searchterm','%'.$searchterm.'%');
  $stmt->execute();
  // loop displays loop
  while ($boxer = $stmt->fetch(PDO::FETCH_OBJ))
  { 
    echo "<ul>";
    echo "<a href='details.php?idboxer=".$boxer->idboxer."'>";
    echo "<li>".$boxer->firstname." ".$boxer->lastname."</li>";
    echo "</a>";
    echo "</ul>"; 
   }
   $conn=NULL;
 }
?>

Answer 2

以下对我来说似乎不适合使用GET而不是POST ..这是正确的吗？这有效但我需要删除/隐藏我的页面（index.php）首次加载时出现的这段代码。

这取决于您何时使用GET或POST。 POST更安全，因此提交表单时我总是使用POST。在这种情况下，您可以保留此代码：

if(isset($_POST['search'])){
    echo 'Search';
}

您需要将表单的action类型更改为POST：

<form action="index.php" method="post">
....

然后添加您需要从POST而不是GET获取搜索值所需的结尾，因为我们更改了action类型。

$searchterm = $_POST['search'];

Answer 3

所以我想出了这个和

<!-- HTML FORM SEARCH BAR -->
<form action="index.php" method="post">
<label for="enteredterm">Enter a Weight-class or a Nationality:</label>
<input type="text" name="enteredterm">
<input type="submit" name="search">
</form>
<!-- HTML FORM SEARCH BAR -->

if(isset($_POST['search'])){
$enteredterm = $_POST['enteredterm'];

if ($enteredterm ===""){
echo "error, enter something.";
} else {

$stmt = $conn->prepare("SELECT * FROM boxer WHERE weightclass LIKE     :enteredterm OR nationality LIKE :enteredterm or lastname LIKE :enteredterm     ORDER BY year");
$stmt->bindValue(':enteredterm','%'.$enteredterm.'%');
$stmt->execute();
$count= $stmt->rowCount();

echo "You entered ".$enteredterm." and returned ";
if($count <= 1){
echo $count." result.";
}else{
echo $count." results.";
}
// loop displays loop
while ($boxer = $stmt->fetch(PDO::FETCH_OBJ))
{ echo "<ul>";
echo "<a href='details.php?idboxer=".$boxer->idboxer."'>";
echo "<li>".$boxer->firstname." ".$boxer->lastname."</li>";
echo "</a>";
echo "</ul>"; }

将结果发布回与搜索表单相同的页面

3 个答案: