如何用PHP代码实现MySQL数据库的增删改查

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推荐于2017-10-06 · 知道合伙人互联网行家

龙氏风采
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<?php
$con = mysql_connect("localhost:3306","root","");

if (!$con) {
die('Could not connect: ' . mysql_error());
}

mysql_select_db("test", $con);

$result = mysql_query("SELECT * FROM user");

echo "<table border='1'>
<tr>
<th>Username</th>
<th>Password</th>
</tr>";

while($row = mysql_fetch_array($result)) {
echo "<tr>";
echo "<td>" . $row['username'] . "</td>";
echo "<td>" . $row['password'] . "</td>";
echo "</tr>";
}
echo "</table>";

mysql_close($con);

?>

从服务器中获取用户所有信息（SQL SELECT语句）并以表格形式出现
<?php
$con = mysql_connect("localhost","root","");
if (!$con) {
die('Could not connect: ' . mysql_error());
}

mysql_select_db("test", $con);

mysql_query("DELETE FROM user WHERE username = '$_POST[username]'");

mysql_close($con);
?>

删除该用户所有信息delete.php
<?php
$con = mysql_connect("localhost:3306","root","");

if (!$con) {
die('Could not connect: ' . mysql_error());
}

mysql_select_db("test", $con);

$sql = "INSERT INTO user (username,password)
VALUES
('$_POST[username]','$_POST[password]')";

if (!mysql_query($sql,$con)) {
die('Error: ' . mysql_error());
}

echo "1 record added";

mysql_close($con);

?>

注册一个新用户insert.php
<?php

$con = mysql_connect("localhost","root","");
if (!$con) {
die('Could not connect: ' . mysql_error());
}

mysql_select_db("test", $con);

mysql_query("UPDATE user SET password = '$_POST[password]' WHERE username = '$_POST[username]'");

mysql_close($con);
?>

修改一个用户密码update.php
<html>
<head>
<title>FORM</title>
</head>
<body>
<br />
<h1>Insert:</h1>
<form action="insert.php" method="post">
username:<input type="name" name="username"/>
<br />
password:<input type="password" name="password"/>
<input type="submit" value="submit"/>
</form>
<br /><hr /><br />
<h1>Delete</h1>
<form action="delete.php" method="post">
username:<input type="name" name="username" />
<br />
Are you sure?<input type="submit" value="sure" />
</form>
<br /><hr /><br />
<h1>Update</h1>
<form action="update.php" method="post">
username:<input type="name" name="username"/>
<br />
You want to change your password into:<input type="password" name="password"/>
<input type="submit" value="submit"/>
</form>
<br /><hr /><br />
</body>
</html>

以上三个功能的提交源Operate.html