本文使用的软件版本如下：PHP版本 5.5.12；MYSQL版本 5.6.17；Apache 2.4.9 用的wampserver
一、PHPMYSQL实现登陆
一共含有两个文件：login.php和logincheck.php;
表单代码：
<form action="logincheck.php"method="post">
Yonghu:<inputtype="text" />
<br />
Mima:<input type="password" />
<br />
<input type="submit" value="登陆" ahref="logincheck.php" />
<a href="https://www.jb51.net/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; <tableborder="1"> <tr> <td bgcolor="#99CCFF"align="center">Name</td> <td bgcolor="#99CCFF">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：
