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在我的数据库中，我有一个名为 user_items 的表，其中存储了每个用户名以及他们拥有的每个项目的数量。每次用户可以购买时，我都有一列，他们的用户名有一列。现在我也有一个 HTML 表单，并且想从 HTML 选择中进行 PDO 选择。

<?php
if (isset($_POST['Detach'])) {

    // Here we get the info about the pokemon
    $teamget = $db->prepare("select * from user_items where username = :name");
    $teamget->execute(array(':name' =>  $_SESSION['username']));
    $getteam = $teamget->fetch(); // Use fetchAll() if you want all results, or just iterate over the statement, since it implements Iterator

    echo $getteam -> $_POST['item'];

    echo "working";
}
?>

<form method="post" action="">

    <select name="item" id="item" style="width:150px;padding-left:5px;">
        <option value=""></option>     
        <option>poke_ball</option>
        <option>great_ball</option>
        <option>ultra_ball</option>
        <option> aster_ball</option>
        <option>potion</option>
        <option>super_potion</option>
        <option>hyper_potion</option>
        <option>burn_heal</option>
        <option>parlyz_heal</option>
        <option>antidote</option>
        <option>awakening</option>
        <option>ice_heal</option>
        <option>dawn_stone</option>
        <option>dusk_stone</option>
        <option>fire_stone</option>
        <option>leaf_stone</option>
        <option>moon_stone</option>
        <option>oval_stone</option>
        <option>shiny_stone</option>
        <option>sun_stone</option>
        <option>thunder_stone</option>
        <option>water_stone</option>
        <option>exp_share</option>
    </select>

    <select name="Detach" id="Detach" style="width:150px;padding-left:5px;">
        <option value=""></option>      
        <option>Attach To Pokemon 1</option>
        <option> Attach To Pokemon 2</option>
        <option> Attach To Pokemon 3</option>
        <option> Attach To Pokemon 4</option>
        <option> Attach To Pokemon 5</option>
        <option> Attach To Pokemon 6</option>

?>
     </select>
     <br/>
     <br/>

     <br/>
     <br/>
     <button name="submit" type="submit" id="Submit_Butt">Detach Item</button>
     <p>&nbsp;</p>
     <p>&nbsp;</p>
 </form>

第一个选择是每列的名称。我要做的是选择列的值 where $_POST= the column

这行得通吗？

$teamget = $db->prepare("select '".$_POST['item']."' from user_items where username = :name");
$teamget->execute(array(':name' =>  $_SESSION['username']));
$getteam = $teamget->fetch(); // Use fetchAll() if you want all results, or just iterate over the statement, since it implements Iterator

echo $getteam ;
4

1 回答 1

0

你的桌子组织方式错误。它必须是什么：

username item quantity

现在你可以这样查询

$sql  ="select quantity from user_items where username = ? and item = ?";
$stmt = $db->prepare($sql);
$stmt->execute(array($_SESSION['username'], $_POST['item']));
$item = $stmt->fetchColumn();

echo $item;

它也应该是user_idanditem_id在这个表中而不是实际名称，但它对你来说已经太复杂了

于 2013-08-31T06:16:52.693 回答