MySQLi 连接

面向对象的风格

连接到服务器

$conn = new mysqli("localhost","my_user","my_password");

设置默认数据库： $conn->select_db("my_db");

连接到数据库

$conn = new mysqli("localhost","my_user","my_password","my_db");

程序风格

连接到服务器

$conn = mysqli_connect("localhost","my_user","my_password");

设置默认数据库： mysqli_select_db($conn, "my_db");

连接到数据库

$conn = mysqli_connect("localhost","my_user","my_password","my_db");

验证数据库连接

面向对象的风格

if ($conn->connect_errno > 0) {
    trigger_error($db->connect_error);
} // else: successfully connected

程序风格

if (!$conn) {
   trigger_error(mysqli_connect_error());
} // else: successfully connected