如何解决MySQL返回的空结果集（即零行）。 （查询花费0.0014秒。）

Question

<?php 
      $con=mysqli_connect("localhost","root","") or die(mysql_error()); 
      $db=mysqli_select_db($con,"registration") or die(mysql_error()); 
      if(isset($_POST['submit1'])){ 
       $t1=$_POST['t1']; 
       $t2=$_POST['t2']; 
       $t3=$_POST['t3']; 
       $t4=$_POST['t4']; 
       $r1=$_POST['r1']; 

       $query="INSERT INTO regtable(t1,t2,t3,t4,r1)VALUES ($t1,$t2,$t3,$t4,$r1)"; 
       if(mysqli_query($con,$query)){ 
        echo "<script>alert('Your are successfully registered!')</script>"; 
       } 
       } 

      ?> 

Answer 1

您使用错误的方法，而应该使用

$query="INSERT INTO regtable(t1,t2,t3,t4)VALUES (:t1, :t2, :t3, :t4)"; 
$query->bindParam(':t1', $t1); 
$query->bindParam(':t2', $t2); 
$query->bindParam(':t3', $t3); 
$query->bindParam(':t4', $t4); 
$query->bindParam(':t5', $t5); 
    $query->execute();