Question

我正在搜索一个表格，其中的结果可能来自3个选项中的任何一个（cata，catb或catc），然后显示结果，但是我的错误警告会一直弹出而无法显示结果？

我被困了......

<?php

include("config.php");

$cata = $_POST['cata'];
$catb = $_POST['catb'];
$catc = $_POST['catc'];

$query = "SELECT * FROM photos WHERE cata=? OR catb=? OR catc=?";
$conn = $db->prepare($query);
$conn->bind_param("sss", $cata, $catb, $catc);

    if ($conn->execute()) {
    $result_db = $db->query($query) or die('Error perform query!');
    }
?>
<table border="1">
<tr>
    <th>cata</th>
    <th>catb</th>
    <th>catc</th>
</tr>
<?php
while ($r = $result_db->fetch_object()) {

    echo '<tr>';
    echo '<td>' . $r->cata . '</td>';
    echo '<td>' . $r->catb . '</td>';
    echo '<td>' . $r->catc . '</td>';
    echo '</tr>';
}
$db->close();
?>

Answer 1

不，您创建了一个预准备语句，然后您使用了具有占位符的普通查询，这就是为什么它不起作用。执行预准备语句，然后从该预准备语句中获取结果。

$query = "SELECT * FROM photos WHERE cata=? OR catb=? OR catc=?";
$conn = $db->prepare($query);
$conn->bind_param("sss", $cata, $catb, $catc);
$conn->execute();
$conn->bind_result($cata, $catb, $catc);
?>
<table border="1">
<tr>
    <th>cata</th>
    <th>catb</th>
    <th>catc</th>
</tr>
<?php
while ($conn->fetch()) {

    echo '<tr>';
    echo '<td>' . $cata . '</td>';
    echo '<td>' . $catb . '</td>';
    echo '<td>' . $catc . '</td>';
    echo '</tr>';
}

或者如果你有mysqlnd（mysql本机驱动程序/或者你没有那个未定义的函数），你也可以使用get_result()：

$query = "SELECT * FROM photos WHERE cata=? OR catb=? OR catc=?";
$conn = $db->prepare($query);
$conn->bind_param("sss", $cata, $catb, $catc);
$conn->execute();
$results = $conn->get_result(); // i like this better
?>
<table border="1">
<tr>
    <th>cata</th>
    <th>catb</th>
    <th>catc</th>
</tr>
<?php
while ($row = $results->fetch_assoc()) {

    echo '<tr>';
    echo '<td>' . $row['cata'] . '</td>';
    echo '<td>' . $row['catb'] . '</td>';
    echo '<td>' . $row['catc'] . '</td>';
    echo '</tr>';
}

?>

Answer 2

尝试一下。与准备好的语句配合使用非常好，并使用Bootstrap CSS来显示结果。首先连接数据库文件并包含它。接下来，布置html容器和表头。我将举一个非常大的示例，其中包含10列和一个动态按钮以链接到每个联系人（这是从我构建的数据库应用程序中获得的），以便用户在找到并编辑联系人后即可查看该联系人。

从表单开始发布到

 <form class="" method="post" action="#">
 <div class="form-group">
 <input class="form-control mr-sm-2 form-adjust" type="text" name="query" 
  placeholder="Please Enter Search Term"
  required></div>
  <button class="btn btn-outline-success my-2 my-sm-0 form-adjust" type="submit" 
   name="search-submit">Start Search</button></form>

已准备好表头

 <div class="table-container">
 <h5 class="table-title">Below are the search results:</h5>
 <table class="table table-striped">
  <thead>
  <tr>
    <th></th>
    <th>Business or Name</th>
    <th>Name</th>
    <th>Last Name</th>
    <th>Address</th>
    <th>City</th>
    <th>State</th>
    <th>ZIP</th>
    <th>Phone</th>
    <th>Email</th>
   </tr>
   </thead>
   <tbody>

打开php脚本。服务器寻找布尔值以在POST上执行

  <?php

  if (isset($_POST['search-submit'])) {
   $query = $_POST['query'];

  $param = "%{$query}%";
  $stmt = $conn->prepare("SELECT * FROM `contacts_main` WHERE `BUSINESS OR NAME` 
  LIKE ? OR `NAME` LIKE ? OR `LAST NAME` LIKE ? OR `ADDRESS` LIKE ? OR `ADDRESS` 
  LIKE ? OR `CITY` LIKE ? OR `STATE` LIKE ? OR `ZIP` LIKE ? OR `PHONE` LIKE ? OR 
  `EMAIL` LIKE ?");
$stmt->bind_param("ssssssssss", $param, $param, $param, $param, $param, $param, $param, $param, $param, $param);
$stmt->execute();
$stmt->store_result();
if($stmt->num_rows === 0) exit('No Search Results');
$stmt->bind_result($id, $businessorname, $name, $lastname, $address, $city, $state, $zip, $phone, $email);
$stmt->fetch();

while ($stmt->fetch()) {

  $showhtml .= "<tr><td>";
  $showhtml .= "<a href = \"view-contact.php?ContactID=$id\" class=\"btn btn-info\">View</a>";
  $showhtml .= "</td><td>";
  $showhtml .= $businessorname;
  $showhtml .= "</td><td>";
  $showhtml .= $name;
  $showhtml .= "</td><td>";
  $showhtml .= $lastname;
  $showhtml .= "</td><td>";
  $showhtml .= $address;
  $showhtml .= "</td><td>";
  $showhtml .= $city;
  $showhtml .= "</td><td>";
  $showhtml .= $state;
  $showhtml .= "</td><td>";
  $showhtml .= $zip;
  $showhtml .= "</td><td>";
  $showhtml .= $phone;
  $showhtml .= "</td><td>";
  $showhtml .= $email;
  $showhtml .= "</td></tr>";

  }

    echo $showhtml;

  }
   ?>

关闭php并关闭表。完成。
```
 </tbody>
 </table>
 </div>
```

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