Retrieve data from the database and display it to the page PHP+Mysql+Html (simple example)

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled document</title>
<style type="text/css">
table{
border: 1px solid black;
border-color:#F06;
padding:10px;
border-collapse:collapse;
}
table tr th{
border: 1px solid black;
border-color:#F06;
padding:10px;
border-collapse:collapse;
}
table tr td{
border: 1px solid black;
border-color:#F06;
padding:10px;
border-collapse:collapse;
}
</style>
</head>
<body>
<center>
<table>
<caption>List of results</caption>
<tr><th>Number</th><th>Name</th><th>Email</th><th>Results</th><th>Time</th></tr>
<?php
//header("Content-Type:text/html;charset=utf-8");//Set the page character encoding
// constant parameters
define("DB_HOST", 'localhost');
define("DB_USER", 'root');
define("DB_PWD",'123');
define("DB_NAME", 'school');
// The first step is to connect to the database
$conn = mysql_connect('localhost','root','123') or die('Database connection failed, error message:'.mysql_error());
// The second step is to select the specified database and set the character set
mysql_select_db(DB_NAME,$conn) or die('Database error, error message:'.mysql_error());
mysql_query('SET NAMES UTF8') or die('Character set setting error:'.mysql_error());
//Add data
// $query = "INSERT INTO grade(name,email,point,regdate)
// VALUES('nurse','[email protected]',67,NOW())";
// mysql_query($query) or die('New error:'.mysql_error());
// change the data
// $query = 'UPDATE grade SET point = 87 WHERE id = 7';
// @mysql_query($query) or die('Modification error:'.mysql_error());
//delete data
// $query = 'DELETE FROM grade WHERE id = 7';
// @mysql_query($query) or die('Delete error:'.mysql_error());
// Display Data
$query = 'SELECT * FROM grade';
$result = mysql_query($query) or die('SQL statement error:'.mysql_error());
// Convert the result set into an array and assign it to $row, if there is data, it is true
while(!!$row = mysql_fetch_array($result)){
echo"<tr><td>".$row["id"]."</td><td>".$row["name"]."</td><td>".$row["email"]."</td><td>".$row["point"]."</td><td>".$row["regdate"]."</td><tr>";
}
mysql_close($conn);
?>
</table>
<a href="#">返回</a>
</center>
</body>
</html>

Retrieve data from the database and display it to the page PHP+Mysql+Html (simple example)

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