Php Mysql 简明教程
PHP & MySQL - Connect Database Example
PHP 提供 mysqli 构造或 mysqli_connect() 函数来打开一个数据库连接。此函数采用六个参数，并且在成功时返回一个 MySQL 链接标识符，在失败时返回 FALSE。
PHP provides mysqli contruct or mysqli_connect() function to open a database connection. This function takes six parameters and returns a MySQL link identifier on success or FALSE on failure.
Syntax
$mysqli = new mysqli($host, $username, $passwd, $dbName, $port, $socket);Sr.No. |
Parameter & Description |
1 |
$host Optional − The host name running the database server. If not specified, then the default value will be localhost:3306. |
2 |
$username Optional − The username accessing the database. If not specified, then the default will be the name of the user that owns the server process. |
3 |
$passwd Optional − The password of the user accessing the database. If not specified, then the default will be an empty password. |
4 |
$dbName Optional − database name on which query is to be performed. |
5 |
$port Optional − the port number to attempt to connect to the MySQL server.. |
6 |
$socket Optional − socket or named pipe that should be used. |
你可以随时使用另一个 PHP 函数 close() 来断开 MySQL 数据库连接。
You can disconnect from the MySQL database anytime using another PHP function close().
Example
尝试以下示例以连接到 MySQL 服务器 −
Try the following example to connect to a MySQL server −
将以下示例复制粘贴为 mysql_example.php：
Copy and paste the following example as mysql_example.php −
<html>
<head>
<title>Connecting MySQL Server</title>
</head>
<body>
<?php
$dbhost = 'localhost';
$dbuser = 'root';
$dbpass = 'root@123';
$mysqli = new mysqli($dbhost, $dbuser, $dbpass);
if($mysqli->connect_errno ) {
printf("Connect failed: %s<br />", $mysqli->connect_error);
exit();
}
printf('Connected successfully.<br />');
$mysqli->close();
?>
</body>
</html>