无法连接到使用PHP和Mysql的数据库

Question

我有一个问题，我需要连接我的数据库并获取表值。但它不像这样发生。我正在解释我的代码如下。

的index.php：

<?php 
session_start(); 
include_once 'dbcon/DBConnection.php'; 
$dbobj = new DBConnection(); 
$dbobj->connect(); 
if (isset($_REQUEST['msg'])){ 
    $msg = urlencode($_REQUEST['msg']); 
} 
if(isset($_POST["login"])){ 
    //echo 'hii';exit; 
    $loginid=htmlspecialchars(trim($_POST['txtname'])); 
    $password =sha1(htmlspecialchars(trim($_POST['pwd']))); 
    //echo $password;exit; 
    $admin = $dbobj->adminLogin($loginid,$password); 
    //echo ($admin->result);exit; 
    if($admin->result == 2){ 
     $msg ='2'; 
    } 
    if($admin->result ==1){ 
     $_SESSION["admin_id"] = $admin->adminid; 
     $_SESSION["admin_name"] = $admin->adminname; 
     $_SESSION["admin_loginid"] = $admin->adminloginid; 
     header("location:dashboard.php"); 
    } 
} 
?> 
<script> 
function valid() 
{ 
    var obj = document.frmlogin; 
    if(obj.txtname.value == "") 
    { 
     alert("Please Enter Username"); 
     obj.txtname.focus(); 
     return false; 
    } 
    if(obj.pwd.value == "") 
    { 
     alert("Please Enter Password"); 
     obj.pwd.focus(); 
     return false; 
    } 
    else 
    { 
     return true; 
    } 
} 
</script> 
<form method="post" name="frmlogin" id="frmlogin" action="" autocomplete="off" class="mt"> 
<label for="" class="text-uppercase text-sm">Username</label> 
<input type="text" placeholder="Username" name="txtname" class="form-control mb"> 
<label for="" class="text-uppercase text-sm">Password</label> 
<input type="password" placeholder="Password" name="pwd" class="form-control mb"> 
<div class="checkbox checkbox-circle checkbox-info"> 
<input id="checkbox7" type="checkbox" checked> 
<label for="checkbox7"> 
    Keep me signed in 
</label> 
</div> 

<button class="btn btn-primary btn-block" name="login" id="login" type="submit" onClick="return valid();">LOGIN</button> 

</form> 

DBConnection.php：

<?php 

class DBConnection{ 
    function __construct() { 

    } 
    // destructor 
    function __destruct() { 
     // $this->close(); 
    } 
    public function connect() { 
     require_once 'dbcon/config.php'; 
     $con = new mysqli(DB_HOST, DB_USER, DB_PASSWORD, DB_DATABASE);  
     if ($con->connect_error)die("Connection failed: "); 
     // return database handler 
     return $con; 
    } 
    public function adminLogin($loginid,$password){ 
     $admin = new AdminUser(); 
     if(ctype_alnum($loginid)){ 
      $sqllogin=sprintf("select * from ".PREFIX."admin where username='%s' and trim(password)='%s' and status=1",mysqli_real_escape_string($con,$loginid),mysqli_real_escape_string($con,$password)); 

      $dbsql=mysqli_query($con,$sqllogin); 

      $Num = mysqli_num_rows($dbsql); 
      echo $Num;exit; 
      if($Num >0){ 
       if($row=mysqli_fetch_array($dbsql)){ 
        $admin->adminid =htmlspecialchars($row['id']); 
        $admin->adminname =htmlspecialchars($row['name']); 
        $admin->adminloginid =htmlspecialchars($row['username']); 
        $admin->result=1; 
       } 
      }else{ 
       $admin->result=2; 
      } 
     }else{ 
      $admin->result=2; 
     } 
     return $admin; 
    } 
} 
?> 

我在这里想呼应当前行，但它没有显示的数量。请帮我解决这个问题。

Answer 1

作为反射的基础，如果使用OOP，请将其用作OOP而不是函数库。

我开始东西给你，你只需要使用它像这样：

$db = new DBConnection('host', 'user', 'pass', 'database_name'); 

$db->connect(); 

$data = $db->adminLogin('login', 'password'); 

-

class DBConnection 
{ 
    protected $_host = null; 
    protected $_user = null; 
    protected $_pass = null; 
    protected $_database = null; 

    protected $_con = null; 

    public function __construct($host, $user, $pass, $db) 
    { 
     $this->_host = $host; 
     $this->_user = $user; 
     $this->_pass = $pass; 
     $this->_database = $db; 
    } 

    function __destruct() 
    { 
     //$this->close(); 
    } 

    public function connect() 
    { 
     $con = new mysqli($this->_host, $this->_user, $this->_pass, $this->_database); 

     if ($con->connect_error) 
     { 
      die("Connection failed: "); 
     } 

     $this->_con = $con; 

     return $con; 
    } 
    public function adminLogin($login, $password) 
    { 
     $admin = new AdminUser(); 

     if(ctype_alnum($login)) 
     { 
      $sqllogin = sprintf(
       "select * from ".PREFIX."admin where username='%s' and trim(password)='%s' and status=1", 
       mysqli_real_escape_string($this->_con, $login), 
       mysqli_real_escape_string($this->_con, $password)); 

      $dbsql=mysqli_query($this->_con,$sqllogin); 

      $Num = mysqli_num_rows($dbsql); 
      echo $Num;exit; 
      if($Num >0){ 
       if($row=mysqli_fetch_array($dbsql)){ 
        $admin->adminid =htmlspecialchars($row['id']); 
        $admin->adminname =htmlspecialchars($row['name']); 
        $admin->adminloginid =htmlspecialchars($row['username']); 
        $admin->result=1; 
       } 
      }else{ 
       $admin->result=2; 
      } 
     }else{ 
      $admin->result=2; 
     } 
     return $admin; 
    } 
} 

顺便说一句，请参阅有关prepare & bindParam & execute & get_result