关于php：如何提高PDO连接的效率？

How do I make my PDO connection more efficient?

好吧，我想我应该先说下面的代码片段是我的最终目标。我希望能够在应用程序的任何地方运行这样的一行，并让它处理PDO连接和执行：

Database::query('QUERY');

为此，我在后台运行以下两个文件。

php：处理pdo连接。

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class Connection {

/**
* The PDO connection.
*
* @var PDO
*/
protected $pdo = NULL;

/**
* The type of database we're connection to.
*
* @var string
*/
protected $type = '';

/**
* The name of the connected database.
*
* @var string
*/
protected $database = '';

/**
* The database connection details.
*
* @var array
*/
protected $config = array();

/**
* Create the connection instance.
*
*/
public function __construct()
{
// Import the configuration information from database.php
$this->config = Config::load('database');

// Pull the database type
$this->type = $this->config['database'];

// Pull the database name
if(isset($this->config[$this->type]['database']))
{
$this->database = $this->config[$this->type]['database'];
}

// Check to see if a connection has been made or not
if($this->pdo==NULL)
{
// Create the connection
$this->pdo = $this->createConnection();
}
}

/**
* Query the database.
*
* @param string $query
* @return array
*/
public function query($query)
{
// Check to see if we have a connection
if($this->pdo!=NULL)
{
// Execute the raw query
$query = $this->pdo->query($query);

return $query;
}

return false;
}

/**
* Execute a query on the database.
*
* @param string $query
* @return int
*/
public function exec($query)
{
// Check to see if we have a connection
if($this->pdo!=NULL)
{
// Execute the raw query
$execution = $this->pdo->exec($query);

return $execution;
}

return false;
}

/**
* Execute a query and return the last inserted Id
*
* @param string $query
* @return int
*/
public function execLastId($query)
{
// Check to see if we have a connection
if($this->pdo!=NULL)
{
// Execute the query and return the Id
if($this->exec($query))
{
return $this->pdo->lastInsertId();
}
}

return false;
}

/**
* Prepare and execute against the database.
*
* @param string $query
* @param array $params
* @return array
*/
public function prepare($query, $params)
{
// Check to see if we have a connection
if($this->pdo!=NULL)
{
// Prepare the query
$query = $this->pdo->prepare($query);

// Execute the query
$query->execute($params);

return $query->fetchAll();
}

return false;
}

/**
* Create a new PDO connection.
*
* @return PDO
*/
protected function createConnection()
{
// See if we can attempt to make a connection
if(isset($this->config[$this->type]))
{
$hasDSN = false;

// Decide what DSN to use
if($this->type=='mysql')
{
$hasDSN = true;

$dsn = $this->getMySQLDSN();
}

// If a DSN has been found, make the connection
if($hasDSN)
{
$username = $this->config[$this->type]['username'];
$password = $this->config[$this->type]['password'];

return new PDO($dsn, $username, $password);
}
}

return NULL;
}

/**
* Get the MySQL DSN.
*
* @return string
*/
protected function getMySQLDSN()
{
return 'mysql:host='.$this->config['mysql']['hostname'].';dbname='.$this->database;
}

}

database.php:位于连接之间的中间。

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class Database {

/**
* Run a raw query on the database.
*
* @param string $query
* @return array
*/
public static function query($query)
{
// Create the connection
$conn = new Connection;

// Return the query
return $conn->query($query);
}

/**
* Execute a query on the database.
*
* @param string $query
* @return int
*/
public static function exec($query)
{
// Create the connection
$conn = new Connection;

// Return the query
return $conn->exec($query);
}

/**
* Execute a query and return the last inserted Id
*
* @param string $query
* @return int
*/
public static function execLastId($query)
{
// Create the connection
$conn = new Connection;

// Return the query
return $conn->execLastId($query);
}

/**
* Prepare and then execute a query.
*
* @param string $query
* @param array $params
* @return array
*/
public static function prepare($query, array $params)
{
// Create the connection
$conn = new Connection;

// Return the query
return $conn->prepare($query, $params);
}
}

我的问题是：这有效率吗？有更简单的方法吗？我很感谢你的指导。我喜欢把自己想象成一个初学者，但我确实缺乏确保应用程序高效和减轻自身重量的经验。