学生信息管理系统（php+mysql）

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 "
$s[0]";
    echo "$s[1]";
    echo "$s[2]";
    echo "$s[3]";
    echo "$s[4]";
    echo "$s[5]";
    echo "$s[6]";
    echo "$s[7]";
    echo "$s[8]";
    echo "$s[9]";

}
    echo "
";
?>

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 "
$s[0]";
    echo "$s[1]";
    echo "$s[2]";
    echo "$s[3]";
    echo "$s[4]";


}
    echo "
";
?>
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 "
$s[0]";
    echo "$s[1]";
    echo "$s[2]";
    echo "$s[3]";
    echo "$s[4]";


}
    echo "
";
?>
/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 "
$s[0]";
    echo "$s[1]";
    echo "$s[2]";
    echo "$s[3]";
    echo "$s[4]";
    echo "$s[5]";

}
    echo "
";
?>

/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">&nbsp;
                input name="b" type="submit" value="添加">&nbsp;
                input name="b" type="submit" value="删除">&nbsp;
            /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 "alert('学号与原数据有异，无法修改!');location.href='xsb.php'";
    }
    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 "alert('修改成功!');location.href='xsb.php'";
            
        }  else {
            echo "alert('修改失败!');location.href='xsb.php'";
        }
    }
}

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 "alert('添加成功!');location.href='xsb.php'";
            
        }  else {
            echo "alert('添加失败!');location.href='xsb.php'";
        }
    }


if (@$_POST["b"] == '删除') {
    if ($num==null) {
        echo "alert('请输入要删除的学号!')";
    } 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 "alert('学号不存在，无法删除!')";
        else {
            $del_sql = "delete from student where sno='$num'";
            $del_result = mysqli_query($conn, $del_sql);
            if (mysqli_affected_rows($conn) != 0)
                echo "alert('删除学号为" . $num . "的学生成功！')";
        }
    }
}
?>

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 "alert('没有该课程信息！')";
?>
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">&nbsp;
                input name="b" type="submit" value="添加">&nbsp;
                input name="b" type="submit" value="删除">&nbsp;
            /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 "alert('课程编号与原数据有异，无法修改！');";
    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 "alert('修改成功！');";
        else
            echo "alert('信息未修改！');";
    }
}
//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 "alert('添加成功!');";
            
}
//单击【删除】按钮
if (@$_POST["b"]=='删除')
{
    if(!$KCH)
    {
    echo "alert('请输入要删除的课程号！');";
}
 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 "alert('课程编号不存在，无法删除！');";
        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 "alert('删除课程".$KCH."成功!');";
        }
}
}
?>

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 "
$s[0]";
    echo "$s[1]";
    echo "$s[2]";
    echo "$s[3]";
    echo "$s[4]";

}
    echo "
";
?>
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 "alert('选课成功!');";
            
}
?>
/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">&nbsp;
            /td>
        /tr>
    /table>
/form>
/body>
/html>
?php
$sno=@$_POST['sno'];
$cno=@$_POST['cno'];

if (@$_POST["b"]=='删除')
{
    if(!$cno)
    {
    echo "alert('请输入要删除的课程号！');";
}

                $del_sql="delete from sc where cno='$cno' and sno='$sno'";
                $del_result=  mysqli_query($conn,$del_sql)or die('删除失败!');
                if (mysqli_affected_rows($conn)!=0)
                    echo "alert('删除成功!');";
        }


?>
/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;
$result= mysqli_query($conn, $sql);
while($s=mysqli_fetch_array($result)){
    echo "
$s[0]";
    echo "$s[1]";
    echo "$s[2]";
    echo "$s[3]";
    echo "$s[4]";

}
    echo "
";
?>
/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