Question

我试图在php中使用mysqli选择where子句和变量，但是我得到了这个错误

错误：我们的查询无法执行，原因如下：查询：SELECT * FROM产品WHERE'CroductCategory'LIKE笔记本电脑Errno：1054错误：'where子句'中的未知列'laptops'

  viewby.php
 <?php
 include('db/functions.php');
  $result= getproductsbycategory($_GET['ctg']);

while($product = $result->fetchassoc()){
    echo $product['ProductName'];
}

?>

//functions.php

 <?php
 function getproductsbycategory($ctg){
 include('connect.php');
     $sql = "SELECT * FROM Products WHERE 'ProductCategory' LIKE $ctg ";
 if(! $result = $mysqli->query($sql))
{
    echo "Error: Our query failed to execute and here is why: \n";
    echo "Query: " . $sql . "\n";
    echo "Errno: " . $mysqli->errno . "\n";
    echo "Error: " . $mysqli->error . "\n";
    exit;
}
return $result;
 }
  ?>
 //index.php

<a href="viewby.php?ctg=<?php echo $ctg; ?>">

 //viewby.php

<?php
 include('db/functions.php');
  $result= getproductsbycategory($_GET['ctg']);

while($product = $result->fetchassoc()){
    echo $product['ProductName'];
}

?>

我真的不知道是什么问题，如果我从phpmyadmin运行查询它工作正常，对不起，如果问题太明显感谢

Answer 1

尝试使用此

更改您的查询

 $sql = "SELECT * FROM Products WHERE `ProductCategory` LIKE '%$ctg%' ";

你正在插入简单的引号＆＃39;而不是这个`

mysqli where子句与php获取错误

1 个答案: