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<!--显示学生数据信息的页面-->
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<?php
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session_start();/*暂时保存我们输入的信息*/
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?>
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<!DOCTYPE html>
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<html>
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<body>
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<?php
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include("connect.php");/*连接数据库，这个数据库的前四个字母在下面的时候写成这样$conn就是连接数据库的意思*/
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//获取表单数据
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$name = $_POST['xm'];
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$sex = $_POST['xb'];
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$birthday = $_POST['cssj'];
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$kcs = $_POST['kcs'];
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//接下来就是分情况讨论
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//如果按下录入键
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if(isset($_POST['录入']))
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{
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//这里就是判断是否输入了姓名
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if(!strlen($name) )//加！表示没有输入姓名，strlen()是一个函数
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{
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//php语句，弹出一个窗口提示括号里的内容
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echo "<script>alert(\"姓名不能为空\");</script>";
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//这里的句子是弹出窗口后就停止运行下面的代码
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exit();
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}
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//sql语句，跟我们学的一样的写记得加引号
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$sql = "select xm from xs where xm = '$name'";
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//运行sql语句，用到了mysqli_query()函数
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$result = mysqli_query($conn,$sql);//括号里的第一个是连接数据库，后面一个是sql语句执行
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//if语句里面用到了一个函数，来判断运行结果是否为真
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if(mysqli_num_rows($result))
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{
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//这里跟上面一样的
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echo "<script>alert(\"学生已存在\");</script>";
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exit();
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}
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//sql语句
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$sql = "insert into xs(xm,xb,cssj,kcs) values('$name','$sex','$birthday','$kcs')";
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//运行
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$result = mysqli_query($conn,$sql);
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//判断结果
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if($result)
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{
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//输出结果
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echo "<script>alert(\"录入成功\")</script>";
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//此句再写一条sql语句进行执行，得到我们想要输出的结果
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$result = mysqli_query($conn,"select * from xs where xm = '$name'");
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//从结果中取一行作数字数组，就下面的输出要用到
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$row = mysqli_fetch_array($result);
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//输出表格头部
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echo "<table border <tr><th>姓名</th><th>性别</th><th>出生日期</th><th>已修课程数</th></tr>";
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//输出表格内容
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echo "<tr><th>".$row['xm']."</th>";
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echo "<th width= 40px>";
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if($row['xb']==1)echo"男";
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else echo"女";
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echo "</th>";
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echo "<th width =120px>".$row['cssj']."</th>";
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echo "<th width = 60px>".$row['kcs']."</th></tr>";
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echo "</table>";
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}
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else
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{
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//这是没录入成功不能输出内容就弹出窗口提示
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echo "<script>alert(\"录入失败\");</script>";
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exit();
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}
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}
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//下面一样的我就不写注释了
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//按下查询按钮
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if(isset($_POST['查询']))
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{
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//这里的句子你可以根据实际情况来分，我这个写的有点晕
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//就输入什么，查到什么
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//不输入的时候是否可以进行查询balabala的
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if(strlen($name))
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{
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}
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if(strlen($name))
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{
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$sql = "select xm from xs where xm = '$name'";
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$result = mysqli_query($conn,$sql);
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if(!mysqli_num_rows($result))
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{
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echo "<script>alert(\"学生不存在\");</script>";
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exit();
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}
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if(strlen($sex))
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{
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$sql = "select xb,xm from xs where xm = '$name' and xb = '$sex'";
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$result = mysqli_query($conn,$sql);
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if($resul)
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{
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$result = mysqli_query($conn,"select * from xs where xm = '$name' and xb ='$sex'");
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$row = mysqli_fetch_array($result);
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echo "<table border=1> <tr><th>姓名</th><th>性别</th><th>出生日期</th><th>已修课程数</th></tr>";
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echo "<tr><th>".$row['xm']."</th>";
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echo "<th width= 40px>";
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if($row['xb']==1)echo"男";
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else echo"女";
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echo "</th>";
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echo "<th width =120px>".$row['cssj']."</th>";
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echo "<th width = 60px>".$row['kcs']."</th></tr>";
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echo "</table>";
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}
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else{
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echo "<script>alert(\"不存在满足条件的同学\")</script>";
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exit();
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}
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}
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}
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else if(strlen($sex))
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{
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if(strlen($kcs))
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{
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$sql = "select xb,kcs from xs where xb = '$sex' and kcs = '$kcs'";
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$result = mysqli_query($conn,$sql);
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if(mysqli_num_rows($result))
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{
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//这里是输出多行内容的，用到了while()，记得表格的头部要写在while()外面，接下来的按照这种方法一直写就ok了
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$row = mysqli_fetch_array($result);
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echo "<table border=1> <tr><th>性别</th><th>已修课程数</th><th>出生日期</th><th>姓名</th></tr>";
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while($row = mysqli_fetch_array($result))
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{
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echo "<tr><th width= 40px>";
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if($row['xb']==1)echo"男";
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else echo"女";
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echo "</th>";
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echo "<th>".$row['kcs']."</th>";
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echo "<th width =120px>".$row['cssj']."</th>";
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echo "<th width = 70px>".$row['xm']."</th></tr>";
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}
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echo "</table>";
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}
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else
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{
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echo "<script>alert(\"无该性别和选修课程数的学生\")</script>";
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exit();
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}
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}
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else
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{
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$sql = "select * from xs where xb = '$sex'";
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$result = mysqli_query($conn,$sql);
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if(!mysqli_num_rows($result))
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{
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echo "<script>alert(\"无该性别的学生\")</script>";
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exit();
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}
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else{
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echo "<table border <tr><th>姓名</th><th>性别</th><th>出生日期</th><th>已修课程数</th></tr>";
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while($row = mysqli_fetch_array($result))
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{
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echo "<tr><th>".$row['xm']."</th>";
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echo "<th width= 40px>";
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if($row['xb']==1)echo"男";
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else echo"女";
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echo "</th>";
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echo "<th width =120px>".$row['cssj']."</th>";
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echo "<th width = 60px>".$row['kcs']."</th></tr>";
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}
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echo "</table>";
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}
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}
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}
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else if(strlen($kcs))
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{
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$sql = "select xm,xb,cssj,kcs from xs where kcs = '$kcs'";
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$result = mysqli_query($conn,$sql);
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if($result)
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{
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echo "<table border=1> <tr><th>姓名</th><th>性别</th><th>出生日期</th><th>已修课程数</th></tr>";
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while($row = mysqli_fetch_array($result))
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{
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echo "<tr><th>".$row['xm']."</th>";
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echo "<th width= 40px>";
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if($row['xb']==1)echo"男";
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else echo"女";
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echo "</th>";
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echo "<th width =120px>".$row['cssj']."</th>";
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echo "<th width = 60px>".$row['kcs']."</th></tr>";
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}
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echo "</table>";
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}
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else{
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echo "<script>alert(\"该已修课程数下无学生数据\")</script>";
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exit();
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}
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}
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else{
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$sql = "select * from xs";
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$result = mysqli_query($conn,$sql);
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if($result)
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{
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echo "<table border=1> <tr><th>姓名</th><th>性别</th><th>出生日期</th><th>已修课程数</th></tr>";
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while($row = mysqli_fetch_array($result))
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{
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echo "<tr><th>".$row['xm']."</th>";
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echo "<th width= 40px>";
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if($row['xb']==1)echo"男";
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else echo"女";
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echo "</th>";
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echo "<th width =120px>".$row['cssj']."</th>";
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echo "<th width = 60px>".$row['kcs']."</th></tr>";
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}
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echo "</table>";
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}
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else{
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echo "<script>alert(\"数据库中暂无学生信息，请开始录入\")</script>";
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exit();
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}
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}
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}
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if(isset($_POST['删除']))
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{
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if(!strlen($name))
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{
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echo "<script>alert(\"姓名不能为空\");</script>";
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exit();
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}
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$sql = "select xm from xs where xm = '$name'";
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$result = mysqli_query($conn,$sql);
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if(!mysqli_num_rows($result)){
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echo "<script>alert(\"学生不存在\");</script>";
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exit();
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}
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$sql = "delete from xs where xm = '$name'";
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$result = mysqli_query($conn,$sql);
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if($result)
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{
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echo "<script>alert(\"删除成功\")</script>";
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exit();
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}
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else{
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echo "<script>alert(\"删除失败\")</script>";
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exit();
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}
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}
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if(isset($_POST['更新']))
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{
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if(!strlen($name)||!strlen($sex)||!strlen($birthday)||!strlen($kcs))
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{
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echo "<script>alert(\"请重新填写，确保信息填写完整\");</script>";
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exit();
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}
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$sql = "select xm from xs where xm = '$name'";
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$result = mysqli_query($conn,$sql);
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if(!mysqli_num_rows($result)){
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echo "<script>alert(\"学生不存在\");</script>";
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exit();
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}
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$sql = "update xs set xb = '$sex',cssj = '$birthday',kcs = '$kcs' where xm = '$name'";
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$result = mysqli_query($conn,$sql);
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if($result)
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{
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echo "<script>alert(\"更新成功\")</script>";
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$result = mysqli_query($conn,"select * from xs where xm = '$name'");
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$row = mysqli_fetch_array($result);
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echo "<table border <tr><th>姓名</th><th>性别</th><th>出生日期</th><th>已修课程数</th></tr>";
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echo "<tr><th>".$row['xm']."</th>";
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echo "<th width= 40px>";
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if($row['xb']==1)echo"男";
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else echo"女";
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echo "</th>";
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echo "<th width =120px>".$row['cssj']."</th>";
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echo "<th width = 60px>".$row['kcs']."</th></tr>";
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echo "</table>";
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}
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else
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{
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echo "<script>alert(\"更新失败，请重试\")</script>";
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exit();
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}
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}
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//写完之后记得关闭连接数据库
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mysqli_close($conn);
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?>
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</body>
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</html>
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