使用预处理语句实现数据查询的方法

查询数据库里面有多少条数据

   
     

    
      
 
       $m=new mysqli('localhost','root','','db'); 
      
    
      
 
       $m->set_charset('utf8'); 
      
    
      
 
       $stmt=$m->prepare('select count(*) from stu'); 
      
    
      
 
       $stmt->execute(); 
      
    
      
 
       $stmt->bind_result($c); 
      
    
      
 
       $stmt->fetch(); 
      
    
      
 
       echo $c; 
      
    
      
 
       $stmt->free_result(); 
      
    
      
 
       $stmt->close(); 
      
    
      
 
       $m->close(); 
      
   
     

使用预处理语句实现数据的查询方法一：

    
      

     
       
$m=new mysqli('localhost','root','','db');
     
       
$m->set_charset('utf8');
     
       
$stmt=$m->prepare('select * from stu where 1=1');
     
       
$stmt->execute();
     
       
$stmt->bind_result($id,$name,$sgender,$sscore);
     
       
while($stmt->fetch()){
     
       
 echo "$id,$name,$sgender,$sscore".'<br>';
     
       
}
     
       
$stmt->free_result();
     
       
$stmt->close();
     
       
$m->close();
    
      

使用预处理语句实现数据的查询方法二：

   
     

    
      
$m=new mysqli('localhost','root','','db');
    
      
$m->set_charset('utf8');
    
      
$stmt=$m->prepare('select * from stu where 1=1');
    
      
$stmt->execute();
    
      
$result=$stmt->get_result();
    
      
$rows=$result->fetch_all(2);
    
      
foreach($rows as $v){
    
      
 print_r($v).'<br>';
    
      
}
    
      

    
      
$stmt->free_result();
    
      
$stmt->close();
    
      
$m->close();
   
     

使用预处理语句实现数据的查询方法三：

   
     

    
      
 
       $m=new mysqli('localhost','root','','db'); 
      
    
      
 
       $m->set_charset('utf8'); 
      
    
      
 
       $stmt=$m->prepare('select * from stu where sid=?'); 
      
    
      
 
       $n=10; 
      
    
      
 
       $stmt->bind_param('i',$n); 
      
    
      
 
       $stmt->execute(); 
      
    
      
 
       $stmt->bind_result($id,$name,$sgender,$sscore); 
      
    
      
 
       $stmt->fetch(); 
      
    
      
 
       echo $id,$name,$sgender,$sscore; 
      
    
      
 
       $stmt->free_result(); 
      
    
      
 
       $stmt->close(); 
      
    
      
 
       $m->close(); 
      
   
     

来自为知笔记(Wiz)