PHP 数据库连接 (Mysql Mysqli PDO)

1.PHP与Mysql扩展（本扩展自 PHP 5.5.0 起已废弃，并在将来会被移除），PHP原生的方式去连接数据库，是面向过程的

<?php
$mysql_conf = array(
    'host'    => '127.0.0.1:3306',
    'db'      => 'test',
    'db_user' => 'root',
    'db_pwd'  => 'root',
    );
$mysql_conn = @mysql_connect($mysql_conf['host'], $mysql_conf['db_user'], $mysql_conf['db_pwd']);
if (!$mysql_conn) {
    die("could not connect to the database:\n" . mysql_error());//诊断连接错误
}
mysql_query("set names 'utf8'");//编码转化
$select_db = mysql_select_db($mysql_conf['db']);
if (!$select_db) {
    die("could not connect to the db:\n" .  mysql_error());
}
$sql = "select * from user;";
$res = mysql_query($sql);
if (!$res) {
    die("could get the res:\n" . mysql_error());
}

while ($row = mysql_fetch_assoc($res)) {
    print_r($row);
}

mysql_close($mysql_conn);
?>

2.PHP与Mysqli扩展,面向过程、对象

<?php
$mysql_conf = array(
    'host'    => '127.0.0.1:3306',
    'db'      => 'test',
    'db_user' => 'root',
    'db_pwd'  => 'joshua317',
    );

$mysqli = @new mysqli($mysql_conf['host'], $mysql_conf['db_user'], $mysql_conf['db_pwd']);
if ($mysqli->connect_errno) {
    die("could not connect to the database:\n" . $mysqli->connect_error);//诊断连接错误
}
$mysqli->query("set names 'utf8';");//编码转化
$select_db = $mysqli->select_db($mysql_conf['db']);
if (!$select_db) {
    die("could not connect to the db:\n" .  $mysqli->error);
}$sql = "select uid from user where name = 'joshua';";
$res = $mysqli->query($sql);
if (!$res) {
    die("sql error:\n" . $mysqli->error);
}
 while ($row = $res->fetch_assoc()) {
        var_dump($row);
    }

$res->free();
$mysqli->close();
?>

3.PHP与PDO扩展,面向过程、对象

<?php
$mysql_conf = array(
    'host'    => '127.0.0.1:3306',
    'db'      => 'test',
    'db_user' => 'root',
    'db_pwd'  => 'joshua317',
    );
$pdo = new PDO("mysql:host=" . $mysql_conf['host'] . ";dbname=" . $mysql_conf['db'], $mysql_conf['db_user'], $mysql_conf['db_pwd']);//创建一个pdo对象
$pdo->exec("set names 'utf8'");
$sql = "select * from user where name = ?";
$stmt = $pdo->prepare($sql);
$stmt->bindValue(1, 'joshua', PDO::PARAM_STR);
$rs = $stmt->execute();
if ($rs) {
    // PDO::FETCH_ASSOC 关联数组形式
    // PDO::FETCH_NUM 数字索引数组形式
    while ($row = $stmt->fetch(PDO::FETCH_ASSOC)) {
        var_dump($row);
    }
}

$pdo = null;//关闭连接
?>