<?php namespace Laravel\Database\Connectors; use PDO;

class Postgres extends Connector {

	/**
	 * Establish a PDO database connection.
	 * 建立 PDO 数据库连接。
	 * @param  array  $config
	 * @return PDO
	 */
	public function connect($config)
	{
		extract($config);

		$dsn = "pgsql:host={$host};dbname={$database}";

		// The developer has the freedom of specifying a port for the PostgresSQL
		// database or the default port (5432) will be used by PDO to create the
		// connection to the database for the developer.
        // 开发人员可以*地为 PostgresSQL 数据库指定端口，或者默认端口 (5432) 将被 PDO 用于为开发人员创建到数据库的连接。
		if (isset($config['port']))
		{
			$dsn .= ";port={$config['port']}";
		}

		$connection = new PDO($dsn, $username, $password, $this->options($config));

		// If a character set has been specified, we'll execute a query against
		// the database to set the correct character set. By default, this is
		// set to UTF-8 which should be fine for most scenarios.
        // 如果已指定字符集，我们将对数据库执行查询以设置正确的字符集。 默认情况下，它被设置为 UTF-8，这对于大多数情况应该没问题。
		if (isset($config['charset']))
		{
			$connection->prepare("SET NAMES '{$config['charset']}'")->execute();
		}

		return $connection;
	}

}

github地址： https://github.com/liu-shilong/laravel3-scr