php查询操作实现投票功能_php技巧

      
  
 <?php include ("DBDA.class.php"); $db=new DBDA(); //从调研题目表中找出题目代号和名称 $sql="select * from diaoyantimu limit 0,1"; $arr=$db->query($sql); $tmmc=$arr[0][1]; $tmdh=$arr[0][0]; echo "
{$tmmc}:
"; //从调研选项表中输出选项内容： $sqlxx="select * from diaoyanxuanxiang where timudaihao='{$tmdh}'"; $arrxx=$db->query($sqlxx); echo "
"; foreach ($arrxx as $v) { echo "
{$v[1]}

"; } ?>    
 
 <?php //计算总人数： $sqlzs="select sum(numbers) from diaoyanxuanxiang where timudaihao='{$tmdh}'"; $zrs=$db->query($sqlzs); foreach ($arrxx as $v) { $name=$v[1]; $number=$v[2]; if($zrs[0][0]==0) { $bfb = 0; } else { $bfb = ($number/$zrs[0][0])*100; } $bfb=round($bfb,2); echo "
 {$name}  
 
 
 
 {$number}  {$bfb}%  
 
 "; } ?>  
   

<?php $arr=$_POST["xx"]; include ("../DBDA.class.php"); $db=new DBDA(); foreach($arr as $v) { $sql = "update diaoyanxuanxiang set numbers = numbers+1 where ids = '{$v}'"; $db->Query($sql,1);//1代表$sql的类型 } header ("location:TouPiao.php"); ?>

<?php //执行一个sql语句，返回相应的结果 class DBDA { public $host="localhost";//数据库服务器地址 public $uid="root";//数据库用户名 public $password="";//数据库密码 //执行SQL语句的方法 //参数里面：$sql代表要执行的sql语句；$type是sql语句的类型，0代表查询，1代表其他(增删改)；$db代表要操作的数据库 function Query($sql,$type=0,$db="mydb") { //造连接对象 $dbconnect=new MySQLi($this->host,$this->uid,$this->password,$db); //判断连接是否出错 !mysqli_connect_error() or die("连接失败！"); //执行sql语句 $result=$dbconnect->query($sql); //判断SQL语句类型 if($type==0) { //如果是查询语句返回结果集的二维数组 return $result->fetch_all(); } else { //如果是其他语句，返回true或false return $result; } } }

     
  
 <?php include ("../DBDA.class.php"); $db=new DBDA(); //从调研题目表中找出题目代号和名称 $sql="select * from diaoyantimu limit 0,1"; $arr=$db->query($sql); $tmmc=$arr[0][1]; $tmdh=$arr[0][0]; echo "
{$tmmc}:
"; //从调研选项表中输出选项内容： $sqlxx="select * from diaoyanxuanxiang where timudaihao='{$tmdh}'"; $arrxx=$db->query($sqlxx); echo "
"; foreach ($arrxx as $v) { echo "
{$v[1]}

"; } ?>     

<?php $arr=$_POST["xx"]; include ("../DBDA.class.php"); $db=new DBDA(); foreach($arr as $v) { $sql = "update diaoyanxuanxiang set numbers = numbers+1 where ids = '{$v}'"; $db->Query($sql,1);//1代表$sql的类型 } header ("location:TouPiao.php"); ?>

     
  <?php include ("../DBDA.class.php"); $db=new DBDA(); //从调研题目表中找出题目代号和名称 $sql="select * from diaoyantimu limit 0,1"; $arr=$db->query($sql); $tmmc=$arr[0][1]; echo "
{$tmmc}:
"; //从调研选项表中输出选项内容： $sqlxx="select * from diaoyanxuanxiang where timudaihao='{$arr[0][0]}'"; $arrxx=$db->query($sqlxx); //计算总人数： $sqlzs="select sum(numbers) from diaoyanxuanxiang where timudaihao='{$arr[0][0]}'"; $zrs=$db->query($sqlzs); foreach ($arrxx as $v) { $name=$v[1];//调研项目名称 $number=$v[2];//选择该项的人数 //判断总人数是否为0 if($zrs[0][0]==0) { $bfb = 0; } else { $bfb = ($number/$zrs[0][0])*100;//求百分比 } $bfb=round($bfb,2); //取小数点后两位 echo "
 {$name}  
 
 
 
 {$number}  {$bfb}%
 

"; } ?>