PHP implements MySQL database connection

php implements MySQL database connection

1. Connect through the "mysql_connect()" function;

$mysql_server='localhost';
$mysql_username='用户名';
$mysql_password='用户密码';
$mysql_database='数据库名';//建立数据库连接
$conn=mysql_connect($mysql_server,$mysql_username,$mysql_password) or die('数据库连接失败！');

2. Use "mysqli_connect ()" or "new mysqli()" to connect, these two methods are the same, just different styles;

The first method is process-oriented

$mysql_server_name = 'localhost'; //改成自己的mysql数据库服务器

$mysql_username = 'root'; //改成自己的mysql数据库用户名

$mysql_password = 'password'; //改成自己的mysql数据库密码

$mysql_database = 'test'; //改成自己的mysql数据库名

$conn=mysqli_connect($mysql_server_name,$mysql_username,$mysql_password,$mysql_database); //连接数据库

//连接数据库错误提示

if (mysqli_connect_errno($conn)) { 

    die("连接 MySQL 失败: " . mysqli_connect_error()); 

}

The second method Object-oriented

//连接数据库方式1

$conn = new mysqli('localhost', 'root', 'password', 'test');

//连接数据库方式2

// $conn = new mysqli();

// $conn -> connect('localhost', 'root', 'password', 'test');

//check connection (检查PHP是否连接上MYSQL)

if ($conn -> connect_errno) {

    printf("Connect failed: %s\n", $conn->connect_error);

    exit();

}

3. Connect based on PDO.

$db = new PDO('mysql:host=localhost;dbname=test', 'root', 'password');

try {

    foreach ($db->query('select * from db_table') as $row){

    print_r($row);

    }

    $db = null; //关闭数据库

} catch (PDOException $e) {

    echo $e->getMessage();

}

Recommended tutorial: "PHP Tutorial"

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