db refactoring.

laravel/db/query/compiler/factory.php

@@ -0,0 +1,35 @@
+<?php namespace Laravel\DB\Query\Compiler;
+
+use Laravel\DB\Connection;
+use Laravel\DB\Query\Compiler;
+
+class Factory {
+
+	/**
+	 * Create a new query compiler for a given connection.
+	 *
+	 * Using driver-based compilers allows us to provide the proper syntax to different database
+	 * systems using a common API. A core set of functions is provided through the base Compiler
+	 * class, which can be extended and overridden for various database systems.
+	 *
+	 * @param  Connection  $connection
+	 * @return Compiler
+	 */
+	public static function make(Connection $connection)
+	{
+		$compiler = (isset($connection->config['compiler'])) ? $connection->config['compiler'] : $connection->driver();
+
+		switch ($compiler)
+		{
+			case 'mysql':
+				return new MySQL;
+
+			case 'pgsql':
+				return new Postgres;
+
+			default:
+				return new Compiler;
+		}
+	}
+
+}

laravel/db/query/compiler/mysql.php

@@ -0,0 +1,14 @@
+<?php namespace Laravel\DB\Query\Compiler;
+
+use Laravel\DB\Query\Compiler;
+
+class MySQL extends Compiler {
+
+	/**
+	 * Get the keyword identifier wrapper for the connection.
+	 *
+	 * @return string
+	 */
+	public function wrapper() { return '`'; }
+
+}

laravel/db/query/compiler/postgres.php

@@ -0,0 +1,19 @@
+<?php namespace Laravel\DB\Query\Compiler;
+
+use Laravel\DB\Query\Compiler;
+
+class Postgres extends Compiler {
+
+	/**
+	 * Compile a SQL INSERT statment that returns an auto-incrementing ID from a Query instance.
+	 *
+	 * @param  Query   $query
+	 * @param  array   $values
+	 * @return string
+	 */
+	public function insert_get_id(Query $query, $values)
+	{
+		return $this->insert($query, $values).' RETURNING '.$this->wrap('id');
+	}
+
+}