php - 为什么php不在mysql中存储数据？

Question

我正在尝试获取一些链接并将它们存储在 MySQL 表中。它不存储数据，但我收到一条错误消息(上面写着“idk man，它没有进入那里”)。我只是不确定我做错了什么。这是我到目前为止所拥有的:

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

    // Check connection
        if ($conn->connect_error) 
        {
        die("Connection failed: " . $conn->connect_error);
        }
       else
       {
        echo "<font  color='#00FF00'>CONNECTED TO DATABASE SUCCESSFULLY</font><br>";
        }

    //find open link record and insert

    foreach ($result as $wtf)
    {
    //now show me
  mysqli_query ($conn,"INSERT INTO carads (adlink) VALUES ('$wtf')");
    echo "<font color='#FFFFFF'>INSERTING LINK INTO DATABASE: $wtf</font><br>";
    }
    $sql="SELECT 'adlink' FROM 'carads'";
    $sqlresult = mysqli_query($conn,$sql );
    //if its messed up tell me now
    if
 ( !$sqlresult)
    {

    echo mysqli_error($conn);
    die("<font size='20' color='#FF0000'>idk man, there was an error and the dataset didnt get in there</font><br>") ;
    }









if ($sqlresult = mysqli_query($conn,$sql))
  {
  // Return the number of rows in result set
  $rowcount=mysqli_num_rows($sqlresult);
  print_r ("<font size='18' color='#00FF00'>Car ads Database has %d ADLINKS from current city.\n</font><br>",$rowcount);






  // Free result set
  mysqli_free_result($result);
  }
//close the connection
mysqli_close($conn);        

再一次，我在这里转了一圈，需要聪明人的一点帮助。为什么不将链接存储在数据库中？

Answer 1

单引号 (') 用于表示字 rune 字。在您的 select 语句中，您试图引用对象(列和表)名称，因此您不应该使用它们:

$sql="SELECT adlink FROM carads"; // Note the lack of quotes
$sqlresult = mysqli_query($conn, $sql);