介绍
本系统是较为简单的一个可以完成学生信息、学生成绩的增删改查，按照班级学科查询学生成绩，查看所有表单，简单的完成学生选课与删除，查询考课名单等功能。
本系统为本人的期末大作业，所以有很多有待修改的bug以及很多有待优化的功能。
界面与其代码
1.主界面（index.php）
<html>
<head>
<title>学生信息管理系统</title>
</head>
<body>
<style type="text/css">
body{
background:url("bg.png") no-repeat;
background-size: 100%;
}
div{
font-size: 30px;
font-weight: bold;
color: #000000;
margin-bottom: 15px;
}
</style>
<div style="text-align: center;color: #000000;" >学生信息管理系统</div>
<div style="text-align: center;color: #000000;">
<a href="bd.php" target="test">表单</a>
<a href="cjcx.php" target="test">学生成绩查询</a>
<a href="xsb.php" target="test">学生表管理</a>
<a href="kcb.php" target="test">课程表管理</a>
<a href="xk.php" target="test">选课系统</a>
<a href="bk.php" target="test">补考名单</a>
<tr>
<td align="center" valign="middle">
<iframe src="" height="800px" width="1200px" name="test" id="test" scrolling="yes" frameborder="0"></iframe>
</td>
</tr>
</div>
</body>
</html>
2.表单界面（bd.php）
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>补考</title>
<style type="text/css">
table{margin:0 auto;}
td{text-align:center;}
</style>
</head>
<body>
<h1 style="text-align: center;color: #000000;">学生表</h1>
<table width="100%" border="1" cellpadding="0" cellspacing="0" height="21" bordercolor="#cccccc" style="border-collapse">
<tr backgorundcolor="#ffffff">
<td width="10%" ><p align="center">学号</td>
<td width="10%" ><p align="center">姓名</td>
<td width="10%" ><p align="center">性别</td>
<td width="10%" ><p align="center">年龄</td>
<td width="10%" ><p align="center">身份证</td>
<td width="10%" ><p align="center">专业编号</td>
<td width="10%" ><p align="center">班级</td>
<td width="10%" ><p align="center">联系方式</td>
<td width="10%" ><p align="center">家庭住址</td>
<td width="10%" ><p align="center">备注</td>
<tr>
<?php
$conn=mysqli_connect("localhost", "root", "123456", "stumanage");
mysqli_set_charset($conn, "set names 'utf8'");
$sql ="select * from student";
$result= mysqli_query($conn, $sql);
while($s=mysqli_fetch_array($result)){
echo "<tr><td height=24>$s[0]</td>";
echo "<td height=24 >$s[1]</td>";
echo "<td height=24 >$s[2]</td>";
echo "<td height=24 >$s[3]</td>";
echo "<td height=24 >$s[4]</td>";
echo "<td height=24 >$s[5]</td>";
echo "<td height=24 >$s[6]</td>";
echo "<td height=24 >$s[7]</td>";
echo "<td height=24 >$s[8]</td>";
echo "<td height=24 >$s[9]</td>";
}
echo "</tr>";
?>
<table width="100%" border="1" cellpadding="0" cellspacing="0" height="21" bordercolor="#cccccc" style="border-collapse">
<h1 style="text-align: center;color: #000000;">课程表</h1>
<tr backgorundcolor="#ffffff">
<td width="10%" ><p align="center">学号</td>
<td width="10%" ><p align="center">姓名</td>
<td width="10%" ><p align="center">课程编号</td>
<td width="10%" ><p align="center">课程名</td>
<td width="10%" ><p align="center">分数</td>
<tr>
<?php
$conn=mysqli_connect("localhost", "root", "123456", "stumanage");
mysqli_set_charset($conn, "set names 'utf8'");
$sql ="select * from course";
$result= mysqli_query($conn, $sql);
while($s=mysqli_fetch_array($result)){
echo "<tr><td height=24>$s[0]</td>";
echo "<td height=24 >$s[1]</td>";
echo "<td height=24 >$s[2]</td>";
echo "<td height=24 >$s[3]</td>";
echo "<td height=24 >$s[4]</td>";
}
echo "</tr>";
?>
<table width="100%" border="1" cellpadding="0" cellspacing="0" height="21" bordercolor="#cccccc" style="border-collapse">
<h1 style="text-align: center;color: #000000;">选课表</h1>
<tr backgorundcolor="#ffffff">
<td width="10%" ><p align="center">课程编号</td>
<td width="10%" ><p align="center">课程名</td>
<td width="10%" ><p align="center">主编</td>
<td width="10%" ><p align="center">出版社</td>
<td width="10%" ><p align="center">成绩</td>
<tr>
<?php
$conn=mysqli_connect("localhost", "root", "123456", "stumanage");
mysqli_set_charset($conn, "set names 'utf8'");
$sql ="select student.sno,sname,course.cno,cname,degree from student,sc,course where student.sno=sc.sno and sc.cno =course.cno order by sno";
$result= mysqli_query($conn, $sql);
while($s=mysqli_fetch_array($result)){
echo "<tr><td height=24>$s[0]</td>";
echo "<td height=24 >$s[1]</td>";
echo "<td height=24 >$s[2]</td>";
echo "<td height=24 >$s[3]</td>";
echo "<td height=24 >$s[4]</td>";
}
echo "</tr>";
?>
</body>
</html>
3.学生成绩查询（cjcx.php）
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>成绩查询</title>
<style type="text/css">
table{margin:0 auto;}
td{text-align:center;}
</style>
</head>
<body>
<h1 style="text-align: center;color: #000000;">成绩查询</h1>
<form name="frm1" method="post" >
<table align="center" >
<tr>
<td width="100"><span>学生班级:</span></td>
<td>
<input name="sclass" id="sclass" type="text">
</td>
<td width="100"><span>课程编号:</span></td>
<td>
<input name="cno" id="cno" type="text">
<input type="submit" name="test" value="查找">
</td>
</tr>
</table>
</form>
<br>
<table width="100%" border="1" cellpadding="0" cellspacing="0" height="21" bordercolor="#cccccc" style="border-collapse">
<tr backgorundcolor="#ffffff">
<td width="15%" ><p align="center">班级</td>
<td width="15%" ><p align="center">学号</td>
<td width="20%" ><p align="center">姓名</td>
<td width="15%" ><p align="center">课程号</td>
<td width="20%" ><p align="center">课程名</td>
<td width="15%" ><p align="center">分数</td>
<tr>
<?php
$sno = @$_POST['sno'];
$sclass = @$_POST['sclass'];
$cno = @$_POST['cno'];
$conn=mysqli_connect("localhost", "root", "123456", "stumanage");
mysqli_set_charset($conn, "set names 'utf8'");
$sql ="select sclass,student.sno,sname,course.cno,cname,degree from student,sc,course where student.sclass='$sclass' and student.sno=sc.sno and sc.cno='$cno'and sc.cno =course.cno";
$result= mysqli_query($conn, $sql);
while($s=mysqli_fetch_array($result)){
echo "<tr><td height=24>$s[0]</td>";
echo "<td height=24 >$s[1]</td>";
echo "<td height=24 >$s[2]</td>";
echo "<td height=24 >$s[3]</td>";
echo "<td height=24 >$s[4]</td>";
echo "<td height=24 >$s[5]</td>";
}
echo "</tr>";
?>
</body>
</html>
4.学生表管理（xsb.php）
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>学生信息更新</title>
<style type="text/css">
table{margin:0 auto;}
td{text-align:center;}
</style>
</head>
<body>
<h1 style="text-align: center;color: #000000;">学生表管理</h1>
<form name="frm1" method="post" >
<table align="center" >
<tr>
<td width="100"><span>根据学号查询:</span></td>
<td>
<input name="sno" id="sno" type="text">
<input type="submit" name="test" value="查找">
</td>
</tr>
</table>
</form>
<br>
<?php
$conn = mysqli_connect("localhost", "root", "123456", "stumanage");
mysqli_set_charset($conn, "set names 'utf8'");
session_start();
$number = @$_POST['sno'];
$_SESSION['number']=$number;
$sql = "select * from student where sno='$number'";
$result = mysqli_query($conn, $sql);
$row = @mysqli_fetch_array($result);
?>
<form name="frm2" method="post" enctype="multipart/form-data">
<table border="1" align="center">
<tr>
<td><span>学号：</span></td>
<td>
<input name="sno" type="text" value="<?php echo $row['sno']; ?>">
<input name="h_sno" type="hidden" value="<?php echo $row['sno']; ?>">
</td>
</tr>
<tr>
<td><span>姓名：</span></td>
<td><input name="sname" type="text" value="<?php echo $row['sname']; ?>"></td>
</tr>
<tr>
<td><span>性别：</span></td>
<td><input name="ssex" type="text" value="<?php echo $row['ssex']; ?>"></td>
</tr>
<tr>
<td><span>年龄：</span></td>
<td><input name="sage" type="text" value="<?php echo $row['sage']; ?>"></td>
</tr>
<tr>
<td><span>身份证号：</span></td>
<td><input name="sid" type="text" value="<?php echo $row['sid']; ?>"></td>
</tr>
<tr>
<td><span>专业编号：</span></td>
<td><input name="sspeciality" type="text" value="<?php echo $row['sspeciality']; ?>"></td>
</tr>
<tr>
<td><span>班级编号：</span></td>
<td><input name="sclass" type="text" value="<?php echo $row['sclass']; ?>"></td>
</tr>
<tr>
<td><span>联系方式：</span></td>
<td><input name="sphone" type="text" value="<?php echo $row['sphone']; ?>"></td>
</tr>
<tr>
<td><span>家庭住址：</span></td>
<td><input name="saddress" type="text" value="<?php echo $row['saddress']; ?>"></td>
</tr>
<tr>
<td><span>备注：</span></td>
<td><input name="sremarks" type="text" value="<?php echo $row['sremarks']; ?>"></td>
</tr>
<td align="center" colspan="2">
<input name="b" type="submit" value="修改">
<input name="b" type="submit" value="添加">
<input name="b" type="submit" value="删除">
</td>
</tr>
</table>
</form>
</body>
</html>
<?php
$num = @$_POST['sno'];
$XH=@$_POST['sno'];
$name = @$_POST['sname'];
$XB = @$_POST['ssex'];
$NL = @$_POST['sage'];
$SFZH = @$_POST['sid'];
$ZYBH = @$_POST['sspeciality'];
$BJBH = @$_POST['sclass'];
$LXFS = @$_POST['sphone'];
$JTZZ = @$_POST['saddress'];
$BZ = @$_POST['sremarks'];
if (@$_POST["b"] == '修改')
{
if ($num!=$XH){
echo "<script>alert('学号与原数据有异，无法修改!');location.href='xsb.php'</script>";
}
else {
$update_sql="update student set sname='$name',ssex='$XB',sage='$NL',sid='$SFZH',sspeciality='$ZYBH',sclass='$BJBH',sphone='$LXFS',saddress='$JTZZ',sremarks='$BZ' where sno='$XH'";
$update_result= mysqli_query($conn,$update_sql);
if (mysqli_affected_rows($conn) != 0){
echo "<script>alert('修改成功!');location.href='xsb.php'</script>";
} else {
echo "<script>alert('修改失败!');location.href='xsb.php'</script>";
}
}
}
if (@$_POST["b"] == '添加') {
$insert_sql = "insert into student(sno,sname,ssex,sage,sid,sspeciality,sclass,sphone,saddress,sremarks) values('$XH','$name','$XB','$NL','$SFZH','$ZYBH','$BJBH','$LXFS','$JTZZ','$BZ')";
$insert_result = mysqli_query($conn, $insert_sql);
if (mysqli_affected_rows($conn) != 0){
echo "<script>alert('添加成功!');location.href='xsb.php'</script>";
} else {
echo "<script>alert('添加失败!');location.href='xsb.php'</script>";
}
}
if (@$_POST["b"] == '删除') {
if ($num==null) {
echo "<script>alert('请输入要删除的学号!')</script>";
} else {
$de_sql = "select sno from student where sno='$num'";
$de_result = mysqli_query($conn, $de_sql);
$de_row = mysqli_fetch_array($de_result);
if (!$de_row)
echo "<script>alert('学号不存在，无法删除!')</script>";
else {
$del_sql = "delete from student where sno='$num'";
$del_result = mysqli_query($conn, $del_sql);
if (mysqli_affected_rows($conn) != 0)
echo "<script>alert('删除学号为" . $num . "的学生成功！')</script>";
}
}
}
?>
5.课程表管理（kcb.php）
<html>
<head>
<meta charset="UTF-8">
<title>课程信息更新</title>
<style type="text/css">
table{margin:0 auto;}
td{text-align:center;}
</style>
</head>
<body>
<h1 style="text-align: center;color: #000000;">课程表管理</h1>
<form name="frm1" method="post">
<table align="center">
<tr>
<td width="120"><span>根据课程号查询:</span></td>
<td>
<input name="cno" id="cno" type="text">
<input type="submit" name="test" value="查找">
</td>
</tr>
</table>
</form>
<?php
$conn= mysqli_connect("localhost","root","123456","stumanage");
mysqli_set_charset($conn,"utf8");
$KCH=@$_POST['cno'];
$sql="select * from course where cno='$KCH'";
$result= mysqli_query($conn,$sql);
$row=@mysqli_fetch_array($result);
if (($cno!=NULL)&&(!$row))
echo "<script>alert('没有该课程信息！')</script>";
?>
<form name="frm2" method="post">
<table border="1" align="center">
<tr>
<td><span>课程编号:</span></td>
<td>
<input name="cno" type="text" value="<?php echo $row['cno'];?>">
<input name="h_cno" type="hidden" value="<?php echo $row['h_cno'];?>">
</td>
</tr>
<tr>
<td><span>课程名:</span></td>
<td><input name="cname" type="text" value="<?php echo $row['cname'];?>"></td>
</tr>
<tr>
<td><span>主编:</span></td>
<td><input name="ceditor" type="text" value="<?php echo $row['ceditor'];?>"></td>
</tr>
<tr>
<td><span>出版社:</span></td>
<td><input name="cpublish" type="text" value="<?php echo $row['cpublish'];?>"></td>
</tr>
<tr>
<td><span>学分:</span></td>
<td><input name="ccredit" type="text" value="<?php echo $row['ccredit'];?>"></td>
</tr>
<tr>
<td align="center" colspan="2">
<input name="b" type="submit" value="修改">
<input name="b" type="submit" value="添加">
<input name="b" type="submit" value="删除">
</td>
</tr>
</table>
</form>
</body>
</html>
<?php
$KCH=@$_POST['cno'];
$h_KCH=@$_POST['cno'];
$KCM=@$_POST['cname'];
$ZB=@$_POST['ceditor'];
$CBS=@$_POST['cpublish'];
$XF=@$_POST['ccredit'];
if (@$_POST["b"]=='修改')
{
if($KCH!=$h_KCH)
echo "<script>alert('课程编号与原数据有异，无法修改！');</script>";
else {
$update_sql="update course set cname='$KCM',ceditor='$ZB',cpublish='$CBS',ccredit='$XF' where cno='$KCH'";
$update_result= mysqli_query($conn,$update_sql);
if (mysqli_affected_rows($conn)!=0)
echo "<script>alert('修改成功！');</script>";
else
echo "<script>alert('信息未修改！');</script>";
}
}
//单击【添加】按钮
if (@$_POST["b"]=='添加')
{
$insert_sql="insert into course(cno,cname,ceditor,cpublish,ccredit) values('$KCH','$KCM','$ZB','$CBS','$XF')";
$insert_result= mysqli_query($conn,$insert_sql)or die('添加失败!');
if(mysqli_affected_rows($conn)!=0)
echo "<script>alert('添加成功!');</script>";
}
//单击【删除】按钮
if (@$_POST["b"]=='删除')
{
if(!$KCH)
{
echo "<script>alert('请输入要删除的课程号！');</script>";
}
else {
$d_sql="select cno from course where cno='$KCH'";
$d_result= mysqli_query($conn,$d_sql);
$d_row= mysqli_fetch_array($d_result);
if (!$d_row)
echo "<script>alert('课程编号不存在，无法删除！');</script>";
else {
$del_sql="delete from course where cno='$KCH'";
$del_result= mysqli_query($conn,$del_sql)or die('删除失败!');
if (mysqli_affected_rows($conn)!=0)
echo "<script>alert('删除课程".$KCH."成功!');</script>";
}
}
}
?>
6.选课系统（xk.php）
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>补考</title>
<style type="text/css">
table{margin:0 auto;}
td{text-align:center;}
</style>
</head>
<body>
<h1 style="text-align: center;color: #000000;">选课表</h1>
<table width="100%" border="1" cellpadding="0" cellspacing="0" height="21" bordercolor="#cccccc" style="border-collapse">
<tr backgorundcolor="#ffffff">
<td width="20%" ><p align="center">课程编号</td>
<td width="20%" ><p align="center">课程名</td>
<td width="20%" ><p align="center">老师</td>
<td width="20%" ><p align="center">教学用书出版社</td>
<td width="20%" ><p align="center">学分</td>
</tr>
<?php
$conn=mysqli_connect("localhost", "root", "123456", "stumanage");
mysqli_set_charset($conn, "set names 'utf8'");
$sql ="select * from course";
$result= mysqli_query($conn, $sql);
while($s=mysqli_fetch_array($result)){
echo "<tr><td height=24>$s[0]</td>";
echo "<td height=24 >$s[1]</td>";
echo "<td height=24 >$s[2]</td>";
echo "<td height=24 >$s[3]</td>";
echo "<td height=24 >$s[4]</td>";
}
echo "</tr>";
?>
<form name="frm1" method="post" >
<table align="center" >
<h2><p style="text-align: center;color: #000000;">选课</h2></p>
<tr>
<td width="100"><span>选课学生学号:</span></td>
<td>
<input name="sno" id="sno" type="text">
</td>
<td width="100"><span>所选课编号:</span></td>
<td>
<input name="cno" id="cno" type="text">
<input type="submit" name="test" value="选课">
</td>
</tr>
</table>
<?php
$sno = @$_POST['sno'];
$cno = @$_POST['cno'];
if (@$_POST["test"]=='选课')
{
$insert_sql="insert into sc(sno,cno) values('$sno','$cno')";
$insert_result= mysqli_query($conn,$insert_sql)or die('添加失败!');
if(mysqli_affected_rows($conn)!=0)
echo "<script>alert('选课成功!');</script>";
}
?>
</form>
<h3 style="text-align: center;color: #000000;">修改选课</h3>
<form name="frm1" method="post">
<table align="center">
<tr>
<td width="100"><span>学号:</span></td>
<td>
<input name="sno" id="sno" type="text">
</td>
<td width="100"><span>选错课程号:</span></td>
<td>
<input name="cno" id="cno" type="text">
<input type="submit" name="test" value="查找">
</td>
</tr>
</table>
</form>
<?php
$conn= mysqli_connect("localhost","root","123456","stumanage");
mysqli_set_charset($conn,"utf8");
$cno=@$_POST['cno'];
$sno=@$_POST['sno'];
$sql="select * from sc where cno='$cno'AND sno='$sno'";
$result= mysqli_query($conn,$sql);
$row=@mysqli_fetch_array($result);
?>
<form name="frm2" method="post">
<table border="1" align="center">
<tr>
<td><span>学号:</span></td>
<td>
<input name="sno" type="text" value="<?php echo $row[0];?>">
</td>
</tr>
<tr>
<td><span>课程号:</span></td>
<td><input name="cno" type="text" value="<?php echo $row[1];?>"></td>
</tr>
<tr>
<td align="center" colspan="2">
<input name="b" type="submit" value="删除">
</td>
</tr>
</table>
</form>
</body>
</html>
<?php
$sno=@$_POST['sno'];
$cno=@$_POST['cno'];
if (@$_POST["b"]=='删除')
{
if(!$cno)
{
echo "<script>alert('请输入要删除的课程号！');</script>";
}
$del_sql="delete from sc where cno='$cno' and sno='$sno'";
$del_result= mysqli_query($conn,$del_sql)or die('删除失败!');
if (mysqli_affected_rows($conn)!=0)
echo "<script>alert('删除成功!');</script>";
}
?>
</body>
</html>
7.补考名单（bk.php）
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>补考</title>
<style type="text/css">
table{margin:0 auto;}
td{text-align:center;}
</style>
</head>
<body>
<h1 style="text-align: center;color: #000000;">以下学生需要补考</h1>
<table width="100%" border="1" cellpadding="0" cellspacing="0" height="21" bordercolor="#cccccc" style="border-collapse">
<tr backgorundcolor="#ffffff">
<td width="20%" ><p align="center">学号</td>
<td width="20%" ><p align="center">姓名</td>
<td width="20%" ><p align="center">课程号</td>
<td width="20%" ><p align="center">课程名</td>
<td width="20%" ><p align="center">分数</td>
<tr>
<?php
$conn=mysqli_connect("localhost", "root", "123456", "stumanage");
mysqli_set_charset($conn, "set names 'utf8'");
$sql ="select sc.sno,sname,sc.cno,cname,degree from student,sc,course where sc.degree<60 and student.sno=sc.sno and sc.cno =course.cno order by sno";
$result= mysqli_query($conn, $sql);
while($s=mysqli_fetch_array($result)){
echo "<tr><td height=24>$s[0]</td>";
echo "<td height=24 >$s[1]</td>";
echo "<td height=24 >$s[2]</td>";
echo "<td height=24 >$s[3]</td>";
echo "<td height=24 >$s[4]</td>";
}
echo "</tr>";
?>
</body>
</html>
数据库部分
学生表（student）
字段名称 数据类型 长度 是否为空
学号 （sno） char 10 N
姓名（ sname） varchar 8 N
性别（ssex） varchar 8 N
年龄（sage） varchar 8 N
身份证号（sid） varchar 8 N
专业编号（sspeciality） varchar 60 N
课程编号（sclass） varchar 8 N
联系方式（sphone） varchar 12 N
家庭住址（saddress） varchar 60 N
备注（sremarks） Varchar 60 N
课程表（course）
字段名称 数据类型 长度 是否为空
课程编号（cno） varchar 8 N
课程名称（cname） varchar 60 N
主编（ceditor） varchar 20 N
出版社（cpublish） varchar 20 N
学分（ccredut） decimal (4,1) N
选课表（sc）
字段名称 数据类型 长度 是否为空
学号（sno） char 10 N
课程编号（cno） varchar 8 N
分数（degree） decimal (4,1) N