PostgreSQLPDOEngine.php
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PostgreSQLPDOEngine.php
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	<?php

	namespace Keruald\Database\Engines;

	use Keruald\Database\Exceptions\NotImplementedException;

	use PDO;
	use PDOException;
	use RuntimeException;

	class PostgreSQLPDOEngine extends PDOEngine {

	use WithPDOPostgreSQL;

	const string PDO_CLASS = PDO::class;

	public function __construct (
	string $host = 'localhost',
	string $username = 'root',
	string $password = '',
	string $database = ''
	) {
	// Checks extension requirement
	if (!class_exists(self::PDO_CLASS)) {
	throw new RuntimeException("This engine requires PDO extension.");
	}

	// Connects to PostgreSQL server
	$dsn = "pgsql:host=$host";
	if ($database !== "") {
	$dsn .= ";dbname=$database";
	}

	try {
	$this->db = new PDO($dsn, $username, $password);
	} catch (PDOException $ex) {
	$this->lastException = $ex;
	$this->onCantConnectToHost();

	return;
	}

	$this->db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
	}

	///
	/// Not implemented features
	///

	/**
	* @throws NotImplementedException
	*/
	public function escape (string $expression) : string {
	throw new NotImplementedException(<<<END
	This PDO engine does not support escape for literals.
	Placeholders are recommended instead for PDO operations.
	END);
	}

	}