db refactoring.

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');
+	}
+
+}