爲什麼PDO沒有連接到數據庫

-1

我對PDO相當陌生，早些時候我總是用mysql或mysqli，但我不知何故通過在線閱讀文章瞭解了PDO，最後我生成了這個commen腳本從數據庫連接。
這是我自己編寫的完整代碼。爲什麼PDO沒有連接到數據庫

<?php 
function connection() { 
    try { 
    $host = "localhost"; 
    $charset = "utf8"; 
    $user = "my_username"; 
    $pass = "my_pass"; 
    $db = "my_db_name"; 
    $dsn = "mysql:host=$host;dbname=$db;charset=$charset"; 

    $options = array(PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION, PDO::ATTR_EMULATE_PREPARES => false, PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC); 
    $conn = new PDO ($dsn, $user, $pass, $options); 

    } catch (PDOException $e) { 
     $output = "We are unable to connect from database"; 
     $file = "error_log.php"; 
     $err_msg = $e->getMessage() " This error occured on <?php echo date("d/m/y i:m:s A");?>"; 
     file_put_contents($file, $err_msg); 
     include 'inc/script-error.php'; 
    } 
     $output = "Connection with database was successfull."; 
     include 'inc/script-success.php'; 
} 
?>

現在首先這個腳本不能正常工作，我還想問一些問題
1.爲什麼我需要這個數據庫trycatch塊裝訂成function？
2.如何使用PDO執行order_by和group_by複雜查詢？

謝謝！

來源

2016-09-16 Jaky

http://stackoverflow.com/questions/13168120/mysql-pdo-connection-to-database –

檢查，如果你有PHP
Exec的安裝PDO擴展命令行：PHP -m
如果存在

下面一個例子與ORDER BY & GROUP BY搜索PDO_MYSQL：

 
    $db = new PDO($dsn, $user, $pass); 
    $stmt = $db->prepare("SELECT * FROM table_name WHERE conditions GROUP BY col_name ORDER BY col_name2 ASC;") ; 
    $stmt->execute(); 
    var_dump($stmt->fetchAll());

來源

2016-09-16 09:12:21 ahammar

感謝您的回答。 – Jaky

歡迎你，如果它能幫助你，請檢查它:) – ahammar

爲什麼PDO沒有連接到數據庫

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