我在这个MySQL查询中遇到了这个错误？

Question

我从perfectly..but与BIND_PARAM（）用事先准备好的声明的问题，收到HTML form..the值收到我的价值？可我使用PHP 7.0.1版本

<?php 
if(isset($_POST['submit'])) 
{ 
    if(empty(($_POST['fname'])) && empty(($_POST['lname'])) && empty(($_POST['dg']))) 
    { 
     header("Location:view.html/form.html"); 
    } 
    else 
    { 
     $f_name=addslashes($_POST['fname']); 
     $l_name=addslashes($_POST['lname']); 
     $post=addslashes($_POST['dg']); 
    } 

//----------------connection to database using Pdo------------------ 
    $hostname="localhost"; 
    $uname="root"; 
    $password=""; 
    $database_name="test"; 
    $conn= new mysqli($hostname,$uname,$password) or die("cannot connect to database Mysql"); 
    $stm=$conn->prepare("insert into s_detail(F_Name,L_Name,Designation) values(?,?,?)"); 
    $stm->bind_param("sss",$f_name,$l_name,$post); 
    //set parameter and execute 
    $f_name=addslashes($_POST['fname']); 
     $l_name=addslashes($_POST['lname']); 
     $post=addslashes($_POST['dg']); 
    if($stm->execute()) 
    { 
     $stm->close(); 
     echo "data is inserted successfully"; 
    } 
    else 
    { 
     echo "failed to insert"; 
    } 
} 
else 
{ 
    echo "Don't be oversmart with me"; 
} 
?> 

的误差。 ..

Fatal error: Uncaught Error: Call to a member function bind_param() on boolean in C:\xampp_7\htdocs\oops in php\oops.php:24 Stack trace: #0 {main} thrown in C:\xampp_7\htdocs\oops in php\oops.php on line 24 

plz帮助.....

Answer 1

您还需要添加数据库参数。这是缺少

$conn= new mysqli($hostname,$uname,$password,$database_name); 

成为习惯，经常检查，看看你是成功连接到数据库的目的

if($conn ==== false) { 
die('error on connecting to database '.$conn->connect_error); 
}