PHPMYSQL实现登陆和模糊查询两大功能_php技巧

后台处理代码：

<?php

     if(isset($_POST["submit"])&& $_POST["submit"] == "登陆")

     {

          $user= $_POST["username"];

          $psw= $_POST["password"];

          if($user== "" || $psw == "")

          {

              echo"";

          }

          else

          {

              $link= mysqli_connect('localhost', 'sa', '123456','account');//链接数据库

              mysqli_select_db($link,"account");

              mysqli_query($link,'setname utf8');

              $sql= "selectuser from zhanghu where user = '$_POST[username]'";

              $result=mysqli_query($link,$sql)or die("Failed".mysql_error());

              if($num=mysqli_num_rows($result))

              {

                   $row= mysqli_fetch_array($result);    //将数据以索引方式储存在数组中

                   echo"welcome ";

                   echo$row[0];

              }

              else

              {

                   echo"";

              }

          }

     }

     else

     {

          echo"";

     }

 

?>

Account数据库内容：

二、PHPMYSQL实现模糊查询

查询数据库（只给PHP的代码）：

<?php

     $mysqli=newmysqli();             

     $mysqli->connect("localhost","sa", "123456");

     if(mysqli_connect_errno()) {

          printf("Failllllll:%s\n", mysqli_connect_error());

          exit();

     }

     $mysqli->select_db("booklib");  

     $mysqli->query("SETNAMES utf8");   

     $rsbooks= $mysqli->query("select * from books where Name like'%$_POST[bookname]%'");

  $row_rsbooks = $rsbooks->fetch_assoc();

  $totalRows_rsbooks = $rsbooks->num_rows;    

?> Totel

<?php echo $totalRows_rsbooks ?>books;



 <?php do { ?>

  

  <?php } while ($row_rsbooks = $rsbooks->fetch_assoc()); ?>



 


  
Name

  
ISBN

  
Store

  
Do

 


   
<?php echo $row_rsbooks['Name']; ?>

   
<?php echo $row_rsbooks['ISBN']; ?>

   
<?php echo $row_rsbooks['Store']; ?>

   
rent

  

<?php

 $rsbooks->close(); 

 $mysqli->close();

?>

数据库表的内容如下：

查询：

结果：

以上就是本文的全部内容，希望对大家学习php程序设计有所帮助。