连接数据库实现添加，删除，修改，AJAX异步，分页，查询等操作，

以下是boss.php页面

<a href="conn.php?&q=add">添加页面</a>

<script>

function go(su){

   if(confirm("您确定要删除吗？")){

      window.location.href='conn.php?id='+su+'&q=delete';

   }else{

      return false;

   }

}

function showsite(str,sd){
if (str=="")

    {

        document.getElementById(sd).innerHTML="";

        return;

    } 

    if (window.XMLHttpRequest)

    {

        

        xmlhttp=new XMLHttpRequest();

    }

    else

    {

        

        xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");

    }

    xmlhttp.onreadystatechange=function()

    {

        if (xmlhttp.readyState==4 && xmlhttp.status==200)

        {

            document.getElementById(sd).innerHTML=xmlhttp.responseText;

        }

    }

    xmlhttp.open("GET","conn.php?w="+str,true);

    xmlhttp.send();

}

</script>

<?php 

$k = isset($_GET['keywords']) ? $_GET['keywords'] : '';

$f = isset($_GET['urlname']) ? $_GET['urlname'] : '';

$c = isset($_GET['emailname']) ? $_GET['emailname'] : '';

?>

<form action="" method="GET">

网站名：<input type="text" name="keywords" size="8" value="<?php echo $k;?>" />

URL:<input type="text" name="urlname" size="8" value="<?php echo $f;?>">

EMAIL:<input type="text" name="emailname" size="8" value="<?php echo $c;?>">

<input type="submit" name="subname" value="搜索"/>

<input type="button" value="全部信息" onclick="window.location='boss.php'"/>

</form>

<?php 

$con = mysqli_connect('127.0.0.1','root','','mydb');

if(!$con){
die("数据库连接失败原因是".mysqli_error($con));

}

mysqli_set_charset($con, 'utf8');

$wherelist = array();

   //封装的查询条件;
if(!empty($k))
{
$wherelist[] = "`name` like '%".$k."%'" ;

}

if(!empty($f))
{
$wherelist[] = "`url` like '%".$f."%'";

    }
if(!empty($c))
{
$wherelist[] = "`email` like '%".$c."%'";
}
if(!empty($wherelist))
{
$where = " where ".implode(" and ", $wherelist);
}else{
$where = "where 1";
}
$page = isset($_GET['page'])?$_GET['page']:1;
$pagesize = 3;
$maxrows;
$maxpage;
$sql = "select * from `websites`";
$res = mysqli_query($con, $sql);
$maxrows = mysqli_num_rows($res);
$maxpage = ceil($maxrows/$pagesize);
if($page > $maxpage){
$page = $maxpage;
}
if($page<1){
$page = 1;
}
$limit = " limit ".($page-1)*$pagesize.",$pagesize";

$arr = "select * from `websites` {$where} order by id desc {$limit}";

//echo $arr;

$result = mysqli_query($con, $arr);

 

    

    echo "<table border='1'>

          <tr>

          <th>ID</th>

          <th>网站名</th>

          <th>url</th>
      <th>email</th>

          <th>alexa</th>

          <th>国家</th>
  <th>点击量</th>
  <th>操作 </th>

          </tr>";

      

    while ($row = mysqli_fetch_array($result)){

   

?>   <tr>

              <td> <?php echo $row['id']; ?></td>

              <td> <?php echo $row['name'];?> </td>

              <td> <?php echo $row['url'];?></td>

              <td> <?php echo $row['email']; ?></td>

              <td> <?php echo $row['alexa'];?> </td>

              <td> <?php echo $row['country'];?> </td>

              <td id='<?php echo $row['id'];?>'></td>

              <td><a href='conn.php?id=<?php echo $row['id'];?>&q=update' >

                                      修改</a>||<button type='button' onclick='go(<?php echo $row['id'];?>)'>

                                      删除</button>||<button type='button' onclick= "showsite(<?php echo $row['id'];?>,<?php echo $row['id'];?>)">点击量</button></td>

             </tr>

             

<?php 

  }

  echo "</table>";

  echo "<br><br>";

  echo "当前第{$page}页/共计{$maxpage}页，共计{$maxrows}条";

  echo "<a href='boss.php?page=1'>首页</a>";

  echo "<a href='boss.php?page=".($page-1)."'>上一页</a>";

  for($i=0;$i<$maxpage;$i++)

{

  echo "<a href='boss.php?page=".$i."'>$i </a>";

}

  echo "<a href='boss.php?page=".($page+1)."'>下一页</a>";

  echo "<a href='boss.php?page=$maxpage'>尾页</a>";

  
?>

以下是conn.pnp页面

<?php 

$con = mysqli_connect('127.0.0.1','root','','mydb');

if(!$con){
die("数据库连接失败原因是".mysqli_error($con));

}

       mysqli_set_charset($con, 'utf8');

       $yibu = isset($_GET['w'])?intval($_GET['w']):FALSE;

       //echo $yibu;

if($yibu){
$frr = "update `websites` set `hits`=hits+1 where id='".$yibu."'";
$yi = mysqli_query($con,$frr);
$grr = "select * from `websites` where id='".$yibu."'";
$ye = mysqli_query($con,$grr);
$en = mysqli
4000
_fetch_array($ye);
echo $en['hits'];
exit();

}

?>

<head>

<meta charset="utf8">

</head>

<body>

<?php 

       $id = isset($_GET['id'])?intval($_GET['id']):FALSE;

       $q = isset($_GET['q'])?$_GET['q']: FALSE;

     

       if($id && $q=='update')

{

$arr = "select * from `websites` where id='".$id."'";

$result = mysqli_query($con,$arr);

$row = mysqli_fetch_array($result);

$sub = isset($_POST['sub'])?$_POST['sub']:FALSE;

    if($sub)

     {

    $nn = $_POST['id'];

    $nb = $_POST['url'];

    $nc = $_POST['alexa'];

    $nd = $_POST['country'];

    if(!empty($_POST['name']))

      {

      $name = test_input($_POST['name']);

      if(!preg_match("/^[a-zA-Z ]*$/", $name)) 

       {

        exit("只允许字母或者空格<br><a href='javascript:history.go(-1)'>返回上一页</a>");

       }else {

        $na = $name;

       }

      }else {

      exit("名字是必须的<br><a href='javascript:history.go(-1)'>返回上一页</a>");

      }

    if(!empty($_POST['url']))

      {

      $url = test_input($_POST['url']);

      if(!preg_match("/\b(?:(?:https?|ftp):\/\/|www\.)[-a-z0-9+&@#\/%?=~_|!:,.;]*[-a-z0-9+&@#\/%=~_|]/i", $url))

       {

        exit("非法url格式<br><a href='javascript:history.go(-1)'>返回上一页</a>");

       }else{

        $nb = $url; 

        }

      }else {

      exit("URL是必须的<br><a href='javascript:history.go(-1)'>返回上一页</a>");

      }  

    if(!empty($_POST['email']))

      {

      $email = test_input($_POST['email']);

     if(!preg_match("/([\w\-]+\@[\w\-]+\.[\w\-]+)/", $email))

       {

      exit("非法邮箱格式<br><a href='javascript:history.go(-1)'>返回上一页</a>");

       

       }else{

     

      $emai = $email;

     

       }

      }else{

     

        exit("邮箱是必须的<br><a href='javascript:history.go(-1)'>返回上一页</a>");

      }

    $nf = "update `websites` SET `id`='$nn',`name`='$na',`url`='$nb',`email`='$emai', `alexa`='$nc',`country`='$nd' WHERE `id` ='$nn'";

    mysqli_query($con, $nf);

    echo "<script>alert('修改成功');location.href='boss.php'</script>";

    

    }

}elseif( $q=='add')

   {

     $row['name'] =  $row['url'] = $row['email'] = $row['alexa'] =$row['country'] = $row['id'] = "";

     $w = isset($_POST['sub'])?$_POST['sub']:FALSE;

     if($w){

     $nc = $_POST['alexa'];

     $nd = $_POST['country'];

     if(!empty($_POST['name']))

     {

      $name = test_input($_POST['name']);

      if(!preg_match("/^[a-zA-Z ]*$/", $name))

      {

      exit("只允许字母或者空格<br><a href='javascript:history.go(-1)'>返回上一页</a>");

      }else {

      $na = $name;

      }

     }else {

      exit("名字是必须的<br><a href='javascript:history.go(-1)'>返回上一页</a>");

     }

     if(!empty($_POST['email']))

     {

      $email = test_input($_POST['email']);

      if(!preg_match("/([\w\-]+\@[\w\-]+\.[\w\-]+)/", $email))

      {

      exit("非法邮箱格式<br><a href='javascript:history.go(-1)'>返回上一页</a>");
 

      }else{

      $emai = $email;

      }

     }else {

      exit("邮箱是必须的<br><a href='javascript:history.go(-1)'>返回上一页</a>");

     }

     if(!empty($_POST['url']))

     {

      $url = test_input($_POST['url']);

      if(!preg_match("/\b(?:(?:https?|ftp):\/\/|www\.)[-a-z0-9+&@#\/%?=~_|!:,.;]*[-a-z0-9+&@#\/%=~_|]/i", $url))

      {

      exit("非法url格式<br><a href='javascript:history.go(-1)'>返回上一页</a>");

      }else{

      $nb = $url;

      }

     }else {

      exit("URL是必须的<br><a href='javascript:history.go(-1)'>返回上一页</a>");

     }

 

     $nf = "INSERT INTO `websites`(`id`, `name`, `url`,`email`, `alexa`, `country`) VALUES ('','$na','$nb','$emai','$nc','$nd')";

     mysqli_query($con, $nf);

     echo "<script>alert('添加成功');location.href='boss.php'</script>";

   }

}elseif($id && $q=='delete')

   {

 

  $delete = "delete from `websites` where `id` = '".$id."'";

  mysqli_query($con, $delete);

  echo "<script>alert('删除成功');location.href='boss.php'</script>";

   }

   function test_input($data){

       $data = trim($data); 

       $data = stripslashes($data);

       $data = htmlspecialchars($data);

       return $data;

   }

 

 ?>

 

  <form action='' method='POST'>

         <input type='hidden' name='id'  value="<?php echo $row['id'];?>">

 网站名：<input type='text' name='name'  value="<?php echo $row['name'];?>"><br>

 URL地址：<input type='text' name='url'  value="<?php echo $row['url'];?>"><br>

 email:   <input type='text' name='email'  value="<?php echo $row['email'];?>"><br>

 alexa排名：<input type='text' name='alexa'  value="<?php echo $row['alexa'];?>"><br>

 国家：           <input type='text' name='country'  value="<?php echo $row['country'];?>">

          <input type='submit' name='sub'  value='提交'>

</form>

</body>