从 PHP 站点更新 MySQL 数据库的信息

Question

我一直在这里尝试各种教程和解决方案，但我无法让它发挥作用。请帮忙！


** 更新 #1 **
这是我在运行代码时收到的错误：“插入中发生错误：您的 SQL 语法有错误；请查看与您的 MySQL 服务器版本相对应的手册，以了解要使用的正确语法在第 1 行的 '' 附近"

** 更新 #2 **
这是显示表中所有内容的页面： 编辑浏览.php

`

  $sql = "SELECT * FROM inventory";
  $result = $connection->query($sql);

  if ($result->num_rows > 0) {
    while ($row = $result->fetch_assoc()) {
      echo "
      <img src=$row[image] id='productImage'> <br>
      product: $row[product] <br>
      category: $row[category] <br>
      seller: $row[seller] <br>
      <a href='edit.php?id=$row[id]'>Edit</a>
      <hr>
      ";
    }
  } else {
    echo "No Results";
  }
  $connection->close();

`

这是当您单击上面的编辑按钮时显示的页面：edit.php

`

  <?php
  // Connection code..etc..


  $sql = "SELECT * FROM inventory WHERE id=".$_REQUEST['id'];
  $result = $connection->query($sql);

  if ($result->num_rows > 0) {
    $row = $result->fetch_assoc();
  } else {
    echo "No Results";
  }
  $connection->close();

?>



<div class="row" id="mainSection">

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

    <input type="hidden" name="id" value="<?=$id?>">

    <h3>Image:</h3>
        <input type="text" name="image" value="<?=$row['image']?>">

    <h3>Product:</h3>
        <input type="text" name="product" value="<?=$row['product']?>">

    <h3>Category:</h3>
        <input type="text" name="category" value="<?=$row['category']?>">

    <h3>Seller:</h3>
        <input type="text" name="seller" value="<?=$row['seller']?>">

    <br>
    <br>

    <input type="submit" value="Update My Record">

  </form>
  <br>
  <a href="admin.php" id="backButton">Back</a>

</div>

`

这是当您单击上面的“更新我的记录”按钮时运行的文件：update.php

'

$id= $_POST['id'];
$image = $_POST['image'];
$product = $_POST['product'];
$category = $_POST['category'];
$seller = $_POST['seller'];



$sql = "UPDATE inventory set image='$image', product='$product', category='$category', seller='$seller' WHERE id = $id";


if ($connection->query($sql) === true) {
  echo "Inserted Successfully";
} else {
  echo "Error occured in the insert: " . $connection->error;
}

 $connection->close();

'

Answer 1

你的 sql 中有句法问题：

$sql = "UPDATE inventory set image='$image', product='$product', category='$category', seller='$seller' WHERE id = $id";

此外，您还需要验证 $id 是否具有正确的值。因为如果它为空或 null，您的查询将失败。

如果要插入数据，可以使用如下查询：

$sql = "INSERT INTO inventory (image, product, category, seller) VALUES ('$image', '$product', '$category', '$seller')";

在你的 edit.php 视图中试试这个：

<?php
    $sql = "SELECT * FROM inventory WHERE id=".$_REQUEST['id];
      $result = $connection->query($sql);

      if ($result->num_rows > 0) {
        $row = $result->fetch_assoc();
      } else {
        echo "No Results";
      }
      $connection->close();
?>
<div class="row" id="mainSection">
  <form action="update.php" method="post">
    <input type="hidden" name="id" value="value="<?php echo $row['id']?>"">
    <h3>Image:</h3>
        <input type="text" name="image" value="<?php echo $row['image']?>">
    <h3>Product:</h3>
        <input type="text" name="product" value="<?php echo $row['product']?>">
    <h3>Category:</h3>
        <input type="text" name="category" value="<?php echo $row['category']?>">
    <h3>Seller:</h3>
        <input type="text" name="seller" value="<?php echo $row['seller']?>">
    <br><br>
    <input type="submit" value="Update My Record">
  </form>
  <br>
  <a href="admin.php" id="backButton">Back</a>    
</div>

Answer 2

$sql = "SELECT * FROM inventory";
  $result = $connection->query($sql);

  if ($result->num_rows > 0) {
    while ($row = $result->fetch_assoc()) {
      echo "
      <img src=$row['image'] id='productImage'> <br>
      product: $row['product'];<br>
      category: $row['category']; <br>
      seller: $row['seller'] ;<br>
      <a href="edit.php?id=$row['id']">Edit</a>
      <hr>
      ";
    }
  } else {
    echo "No Results";
  }
  $connection->close();

EDIT.PHP

<div class="row" id="mainSection">
  <?php $id = $_REQUEST['id']; ?>
  <form action="update.php" method="post">

    <input type="hidden" name="id" value="<?=$id?>">

    <h3>Image:</h3>
        <input type="text" name="image">

    <h3>Product:</h3>
        <input type="text" name="product">

    <h3>Category:</h3>
        <input type="text" name="category">

    <h3>Seller:</h3>
        <input type="text" name="seller">

    <br>
    <br>

    <input type="submit" value="Update My Record">

  </form>
  <br>
  <a href="admin.php" id="backButton">Back</a>

</div>

UPDATE.PHP

<?php
$id= $_POST['id'];
$image = $_POST['image'];
$product = $_POST['product'];
$category = $_POST['category'];
$seller = $_POST['seller'];

$sql = "UPDATE inventory set image='".$image."', product='".$product."', category='".$category."', seller='".$seller."' WHERE id = ".$id." ";

if ($connection->query($sql) === true) {
  echo "Inserted Successfully";
} else {
  echo "Error occured in the insert: " . $connection->error;
}

 $connection->close();

Answer 3

您需要为id 设置一个值，然后在查询中使用$_POST['id']。

Answer 4

首先更新查询的sql语法是错误的。其次，表单中的 id 中没有设置值。因此，当您发布表单时，该值将为空。