PHP代写：CS353 Database System

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本题需要实现一个简易的基于网页的查询功能，包括连接数据库、数据库查询、处理用户输入、异常处理。

Requirement

Prior to beginning tis request, please download the studentsdb.sql, studentdb.pdf and the Index.php file from the course web site.
In this request, you are to complete the php script, Index.php, which will use the values input by the user. This script contains one push botton and one textbox in order to perform the interaction.
The web page should provide the following functions:

  1. Connect to the database
  2. Check if the database connection is successful
  3. Validation on user typing
  4. Search and display the query result of each student
  5. Error message if no student found

Analysis

本题需要实现一个简易的基于网页的查询功能，包括连接数据库、数据库查询、处理用户输入、异常处理。用户的交互部分已经由Index.php提供，我们需要做的是完善它的逻辑。
本题难点在于调试部分，建议一边实现一边调试，并在关键地方打印变量值来进行调试。

Tips

下面给出数据库连接部分代码，默认数据库为本地mysql，用户名为root，密码为123456

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<?php
...
$conn = mysql_connect("localhost", "root", "123456");
if (!$conn) {
  // connection failed
  echo "Could not connect to database: " . mysql_error();
}
// connection successful
...
mysql_close($conn)
?>