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HomeBackend DevelopmentPHP Tutorial一个简单的自动发送邮件系统(二)_php基础

这里介绍php和mysql结合起来实用。

    基本上,可以说php是介于后台数据库和前台浏览器的一个中间层,在他们之间传递命令。这种方式大大提高了交互的可能性,可以方便使用在投票系统,其他动态用户输入和个性化网站中。

    要想实现这种交互,首先必需实现和mysql数据库连接,可以使用这个命令实现:
    语法:int mysql_connect(string hostname, string username, string password);  

    ·hostname - 运行数据库服务器所在的主机名称。
    ·username - 连接到数据库服务器的用户名称。
    ·Password - 用户密码。the password set to connect to the MySQL database.  
     如果连接成功,函数返回一个正整数,如果失败返回一个负数。

     所有的命令,和往常一样,必需放置在"" 和 "?>"之间。

     让我们继续我们的工程,让我们假设用MySQL建立了以下的数据表:

----------------------------    

mysql> CREATE TABLE information (
    -> name VARCHAR (25),
    -> email VARCHAR (25),    
    -> choice VARCHAR (8) );

----------------------------    

    现在让我们假设我们要吧用户的信息插入到这个数据库中,我们可以通过修改email.php3脚本来实现,修改如下:

----------------------------    


/* 这个脚本将使用从moreinfo.html文件中传递过来的变量。 */

/* 声明一些相关的变量 */

$hostname = "devshed";
$username = "myusername";
$password = "mypassword";
$dbName = "mydbname";

/* 使用MySQL建立的数据表存取信息  */
$userstable = "information";

/* 网站管理员的邮件地址*/
$adminaddress = "administration@buycorn.com";

/* 与数据库连接*/
MYSQL_CONNECT($hostname,$username,$password) OR DIE("Unable to connect to database");

@mysql_select_db("$dbName") or die("Unable to select database");  

PRINT "

";
PRINT "Hello, $name.";
PRINT "

";
PRINT "Thank you for your interest.

";
PRINT "We will send information to $email, and have noted that you like $preference";
PRINT "


";

/* 发送有关邮件*/
mail("$email", "Your request for information",
"$namenThank you for your interest!n
We sell fresh corn daily over the Internet!
Place your order  at http://www.buycorn.com,
and receive a free package of $preference!");

mail("$adminaddress",
"Visitor request for info.",
"$name requested for information.n

The email address is $email. n The visitor prefers $preference.");

/* 将数据插入数据表中*/
$query = "INSERT INTO $userstable VALUES('$name','$email', '$preference')";
$result = MYSQL_QUERY($query);

PRINT "Your information has also been inserted into our database, for future reference.";

/* 关闭与数据库的连接*/
MYSQL_CLOSE();
?>

----------------------------    

一些注意的地方:

1、在脚本一开始声明的变量是为了函数MYSQL_CONNECT() 。我们也可以直接在函数中将这些值给出,可是,考虑工程的可发展性,这些值应该放在一个独立的文件中,用(#include)调入。
2、语法: int mysql_select_db(string database_name, int link_identifier);
·database_name  必需是在服务器上的数据库名。
·link_identifier(可选的) 是指明连接,基于此向数据库服务器发出请求。
·返回值为true/false
3、语法: int mysql_query(string query, int link_identifier);
·query  发送向mysql服务器的sql命令。
·link_identifier(可选择)  指明连接,基于此向数据库服务器发送sql命令。
·返回值为整数,正数表示成功了,负数表示失败。
4、语法: int mysql_close(int link_identifier);  
·link_indentifier  与上面相同
·返回值为整数,正数表示成功了,负数表示失败。

在下一篇文章中,我将给大家讲解如何从mysql中输出数据。 
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