PHP PDO連接

Question

我想在PHP中使用PDO創建數據庫連接的連接類

這是我的代碼：

<?php
class DatabaseConnection {

private $dbname     = "db_01";
private $host       = "localhost";
private $user       = "xxx";
private $password   = "xxxxxx";
private $port       = 5432;

private $DBH;

public function __construct() {
    try {
        $this->DBH  = new PDO("pgsql:host=$this->host;port=$this->port;dbname=$this->dbname;user=$this->user;password=$this->password");
    } catch(PDOException $e) {
        echo    $e->getMessage();  
    }

}
public function disconnect() {
    $this->DBH  = null; 
}
}
?>

對於PDO中的查詢，我必須使用$ DBH-> query（'SELECT * from user'）;

但是，如果我在其他課程中使用我的連接課程，該怎么辦？

例

<?php
include "DatabaseConnection.php";
class User {
    private $connection;

    public function getUser() {
        $this->connection = new DatabaseConnection();
        $STH = $this->connection->query('SELECT * from User');
    }
}
?>

但這是行不通的。

有誰能幫助我？ 謝謝 ：）

更新 ：

按照約拿的建議，

<?php

class DatabaseConnection extends PDO {

private $dbname     = "db_01";
private $host       = "localhost";
private $user       = "xxx";
private $password   = "xxxxxxxxx";
private $port       = 5432;

public function __construct() {
    try {
        parent::__construct("pgsql:host=$this->host;port=$this->port;dbname=$this->dbname;user=$this->user;password=$this->password");
    } catch(PDOException $e) {
        echo    $e->getMessage();  
    }

}
public function disconnect() {
    $this = null;   
}
}
?>

我在瀏覽器中收到消息“連接已重置”，怎么了？

Answer 1

那行不通。 您要么需要創建一種在PDO中調用query的方法：

class DatabaseConnection {
    // ...
    public function query($sql) {
        return $this->DBH->query($sql);
    }
    // ...
}

或擴展PDO。

class DatabaseConnection extends PDO {
    // ...
}

更新：另一方面，包裝PDO類根本沒有意義。 為什么不直接創建PDO對象呢？

Answer 2

class User {
  private $connection;

  public function __construct ($connection) {
    $this->connection = $connection;
  }

  public function getUser() {
    $STH = $this->connection->query('SELECT * from User');
  }
}