使用复选框创建SQL查询

Question

我是SQL和PHP的新手，并尝试运行查询。

我正在努力把正确的操作员放进去，并且无法弄清楚为什么它不起作用！我一直在使用AND OR CASE

我有4个复选框：酒吧，俱乐部，餐馆，酒吧。

在我的数据库中，我的单选按钮上的每个单词都有一个名称列和一列。如果企业是一个Bar，那么在相应的Bar列中有一个1。如果企业是Pub，那么在相应的Pub列中有1。如果两者都是，那么它将在等等中都有1

这是它的样子：

Name  | Bar   | Club | Restaurant | Pub
———————————————————————————————————————
McD   |  0    |  0   |      1     |  0
KFC   |  1    |  0   |      1     |  0
SPN   |  1    |  1   |      1     |  1
GRG   |  0    |  1   |      1     |  0

如果没有检查，我希望结果显示所有选项的名称。当栏被选中时，只有经过俱乐部的酒吧，然后只有俱乐部等等

当酒吧和俱乐部被检查然后我想看所有酒吧和俱乐部等等

我如何得到我想要的结果？非常感谢您的帮助！

这是我目前正在处理的代码（我已将Bar变量保留在其中）：

<?php

error_reporting(E_ALL);

$servername = "**";
$username = "**";
$password = "**";
$dbname = "**";

// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);

// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
} 

if(isset($_POST['submit'])) {

    $getselectClub = implode(",",$_POST['selectClub']);
    $getselectResturant = implode(",",$_POST['selectResturant']);
    $getselectBar = implode(",",$_POST['selectBar']);

$sql = "SELECT id, name, locale FROM theList WHERE bar='$getselectBar' ";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    // output data of each row
    while($row = $result->fetch_assoc()) {


?>

<?php echo $row['id'];?> &nbsp;
<?php echo $row['name'];?> &nbsp;
<?php echo $row['locale'];?><br>

<?php }}} ?>

<form method="post">
    Club: <input type='checkbox' name="selectClub[]" value="1" />
    Resturant: <input type='checkbox' name="selectResturant[]" value="1" />
    Bar: <input type='checkbox' name="selectBar[]" value="1"/>
    <input type="submit" name="submit" value="submit" />
</form> 

Answer 1

如果未选中，则不会提交复选框。因此，在将其提交到查询之前，请检查其提交。将[]添加到表单输入名称的末尾会将其作为数组提交，这不是您需要的。

<?php

error_reporting(E_ALL);

$servername = "**";
$username   = "**";
$password   = "**";
$dbname     = "**";

// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);

// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
} 

if(isset($_POST["submit"])) {
    $where = [];
    $query = "";
    if (!empty($_POST['selectClub'])) $where[] = "club=1";
    if (!empty($_POST['selectRestaurant'])) $where[] = "restaurant=1";
    if (!empty($_POST['selectBar'])) $where[] = "bar=1";

    // check in case no boxes were checked
    if (!empty($where)) {
        $query = "WHERE " . implode(" OR ", $where);
    }

    $sql = "SELECT id, name, locale FROM theList $query";
    $result = $conn->query($sql);

    if ($result->num_rows > 0) {
        // output data of each row
        while($row = $result->fetch_assoc()) {
            echo "$row[id] &nbsp; $row[name] &nbsp; $row[locale]<br/>";
        }
    }
}
?>

<form method="post">
    Club: <input type='checkbox' name="selectClub" value="1" />
    Restaurant: <input type='checkbox' name="selectRestaurant" value="1" />
    Bar: <input type='checkbox' name="selectBar" value="1"/>
    <button type="submit" name="submit" value="1">Submit</button>
</form>