php搭建简单的留言板

一,mysql数据库配置,

使用phpmyadmin新建一个数据库,message,新建一个text的表,并增加两个字段:context varchar(30),date datetime;

增加一个message用户,并设密码123456;

给message用户赋予权限,在phpmyadmin里面,运行sql:

GRANT ALL PRIVILEGES ON `message` . * TO 'message'@'localhost' WITH GRANT OPTION ;

至此,数据库配置结束.

二,html

新建2个htm文档,分别为index.htm(主界面),leave_success.htm(留言成功提示);

index.htm代码如下:

<!DOCTYPE HTML>
<html>
<head>
    <meta http-equiv="content-type" content="text/html" />
    <meta name="author" content="" />

    <title>Messages</title>
</head>

<body>
    <a href="watch_message.php">Watch Messages</a>
    <p>
    Please Submit your message!
    </p>
    <form action="leave_message.php" method="post">
        <p><textarea name="text_area" rows="10" cols="30"></textarea>
        <p><input type="submit" value="Submit" /></p>
    </form>
</body>
</html>

View Code

leave_success.htm代码如下:

<!DOCTYPE HTML>
<html>
<head>
    <meta http-equiv="content-type" content="text/html" />
    <meta name="author" content="" />

    <title>Leave_success</title>
</head>

<body>

<p>Leave message ok!</p>
<a href='index.htm'>Back</a>

</body>
</html>

View Code

新建connect.php(连接数据库),watch_message.php(查看留言),leave_message.php(留言主页面)
connect.php:

<?php
try{
    $dsn='mysql:host=localhost;dbname=message';
    $username='message';
    $password='123456';
    $dbh = new PDO($dsn,$username,$password);
//    $pdo->setAttribute(PDO::ATTR_AUTOCOMMIT,FALSE);

}catch(Exception $e){
    die("Unable to connect:".$e->getMessage());
}
?>

View Code

watch_message.php:

<p>Message_list</p>
<a href='index.htm'>Back</a><hr>
<?php
require_once "connect.php";
try{
    $sql = "SELECT COUNT(*) FROM text";
    $res = $dbh->query($sql);
    $res ->execute();
    $result_num = $res->fetchColumn();
    
    
    $rowsperpage = 3;
    $totalpages = ceil($result_num / $rowsperpage);
    
    if(isset($_GET['currentpage']) && is_numeric($_GET['currentpage'])){
        $currentpage = (int) $_GET['currentpage'];
    }else{
        $currentpage = 1;
    }
    
    if ($currentpage > $totalpages){
        $currentpage = $totalpages;
    }
    if ($currentpage < 1){
        $currentpage = 1;
    }
    $offset = ($currentpage - 1) * $rowsperpage;
    
    $sql = "SELECT context,date FROM text LIMIT $offset,$rowsperpage";
    foreach($dbh->query($sql) as $row){
        echo "<p>",$row['date'],"</p><p>",$row['context'],"</p>";
    }
    if ($currentpage > 1){
        echo " <a href='{$_SERVER['PHP_SELF']}?currentpage=1'><<</a> ";
        $prevpage = $currentpage - 1;
        echo " <a href='{$_SERVER['PHP_SELF']}?currentpage=$prevpage'><</a> ";
    }
    if ($currentpage != $totalpages){
        $nextpage = $currentpage + 1;
        echo " <a href='{$_SERVER['PHP_SELF']}?currentpage=$nextpage'>></a> ";
        echo " <a href='{$_SERVER['PHP_SELF']}?currentpage=$totalpages'>>></a> ";
    }
    //$sth = $dbh->prepare($sql);
    //$sth ->execute();    
    $res = null;
    $dbh = null;
}catch(PDOException $e){
    print "Error!:".$e->getmessage()."<br/>";
    die();
}
?>

View Code

leave_message.php:

<?php

$message_text=htmlspecialchars($_POST['text_area']);
if($message_text==''){
    Header("Location: index.htm");   
}else{
    $today = date("Y-m-d H:i:s",time()); ;
    require_once "connect.php";
    try{
        $dbh->exec("INSERT INTO text(context,date) values('$message_text','$today')");
        $dbh = null;
        Header("Location: leave_success.htm");
    }catch(PDOException $e){
        print "Error!:".$e->getmessage()."<br/>";
        die();
    }
}
?>