PHP MYSQL登陆和模糊查询

表单代码：

<form action="logincheck.php"method="post">

         Yonghu:<inputtype="text" name="username" />

   <br />

   Mima:<input type="password" name="password" />

   <br />

   <input type="submit" name="submit" value="登陆" ahref="logincheck.php" />

   &nbsp;&nbsp;&nbsp;&nbsp;

   <a href="register.php">zhuce:</a>

</form>

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"<script>alert(‘请输入用户名或密码！‘); history.go(-1);</script>";

                   }

                   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"<script>alert(‘用户名或密码不正确！‘);history.go(-1);</script>";

                            }

                   }

         }

         else

         {

                   echo"<script>alert(‘Submit Failed!‘);history.go(-1);</script>";

         }

?>

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;

<table width="600"border="1">

 <tr>

   <td bgcolor="#99CCFF"align="center">Name</td>

   <td bgcolor="#99CCFF" align="center">ISBN</td>

   <td bgcolor="#99CCFF"align="center">Store</td>

   <td bgcolor="#99CCFF"align="center">Do</td>

 </tr>

 <?php do { ?>

   <tr>

     <td><?php echo $row_rsbooks[‘Name‘]; ?></td>

     <td><?php echo $row_rsbooks[‘ISBN‘]; ?></td>

     <td><?php echo $row_rsbooks[‘Store‘]; ?></td>

     <td><fontcolor="#110BAA">rent</font></td>

   </tr>

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

</table>

<?php

 $rsbooks->close(); 

 $mysqli->close();

?>

数据库表的内容如下：

查询：

结果：