Question

final class MySQL {
 private $connection;

 public function __construct($hostname, $username, $password, $database) {
  if (!$this->connection = mysql_connect($hostname, $username, $password)) {
        exit('Error: Could not make a database connection using ' . $username . '@' . $hostname);
     }

     if (!mysql_select_db($database, $this->connection)) {
        exit('Error: Could not connect to database ' . $database);
     }

  mysql_query("SET NAMES 'utf8'", $this->connection);
  mysql_query("SET CHARACTER SET utf8", $this->connection);
  mysql_query("SET CHARACTER_SET_CONNECTION=utf8", $this->connection);
  mysql_query("SET SQL_MODE = ''", $this->connection);
   }

错误：无法连接到数据库......

Answer 1

让MySQL告诉您有关错误的更多信息，请参阅http://docs.php.net/mysql_error

define('DEBUGOUTPUT', 1);

final class MySQL {
  private $connection;

  public function __construct($hostname, $username, $password, $database) {
    if (!$this->connection = mysql_connect($hostname, $username, $password)) {
      if ( defined('DEBUGOUTPUT') && DEBUGOUTPUT ) {
        echo __METHOD__, ': ', mysql_error(), "\n";
      }
      exit('Error: Could not make a database connection using ' . $username . '@' . $hostname);
    }

但正如前面所提到的：不要建立另一个（抱歉是直率）糟糕的MySQL类。使用现有的（一个更好的）类/库，获得经验，然后 - 如果你仍然想要并且承诺 - 再次尝试建立一个非常好的。

php中的mysql数据库连接问题

1 个答案: