PHP連接MySQL數(shù)據(jù)庫(kù)三種實(shí)現(xiàn)方法

$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());//診斷連接錯(cuò)誤
}
mysql_query("set names 'utf8'");//編碼轉(zhuǎn)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);

?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);//診斷連接錯(cuò)誤
}
$mysqli->query("set names 'utf8';");//編碼轉(zhuǎn)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();
?>

?php
$mysql_conf = array(
  'host'  => '127.0.0.1:3306', 
  'db'   => 'test', 
  'db_user' => 'root', 
  'db_pwd' => 'joshua317', 
  );
try {
  $pdo = new PDO("mysql:host=" . $mysql_conf['host'] . ";dbname=" . $mysql_conf['db'], $mysql_conf['db_user'], $mysql_conf['db_pwd']);//創(chuàng)建一個(gè)pdo對(duì)象
  $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);  // 設(shè)置sql語(yǔ)句查詢?nèi)绻霈F(xiàn)問(wèn)題 就會(huì)拋出異常
  //set_exception_handler("cus_exception_handler");
} catch (PDOException $e) {
  die("connect error:".$e->getMessage());
}
$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 關(guān)聯(lián)數(shù)組形式
  // PDO::FETCH_NUM 數(shù)字索引數(shù)組形式
  while ($row = $stmt->fetch(PDO::FETCH_ASSOC)) {
    var_dump($row);
  }
}