From: Greg Sabino Mullane <greg@users.mediawiki.org>
Date: Mon, 20 Jul 2009 02:20:15 +0000 (+0000)
Subject: Add standardSelectDistinct() function to help fork queries based on whether the order... 
X-Git-Tag: 1.31.0-rc.0~40812
X-Git-Url: http://git.cyclocoop.org/%22%20.%20generer_url_ecrire%28%22auteur_infos%22%2C%20%22id_auteur=%24id%22%29%20.%20%22?a=commitdiff_plain;h=e8da51a5740e17a85278e225bc6428e55842b5a4;p=lhc%2Fweb%2Fwiklou.git

Add standardSelectDistinct() function to help fork queries based on whether the order by items must appear in the select distinct list. See bug 18078.
---

diff --git a/includes/db/Database.php b/includes/db/Database.php
index b05a6a99bf..c505161521 100644
--- a/includes/db/Database.php
+++ b/includes/db/Database.php
@@ -192,6 +192,14 @@ abstract class DatabaseBase {
 		return true;
 	}
 
+	/**
+	 * Returns true if this database requires that SELECT DISTINCT queries require that all 
+       ORDER BY expressions occur in the SELECT list per the SQL92 standard
+	 */
+	function standardSelectDistinct() {
+		return true;
+	}
+
 	/**
 	 * Returns true if this database can do a native search on IP columns
 	 * e.g. this works as expected: .. WHERE rc_ip = '127.42.12.102/32';
diff --git a/includes/db/DatabaseMysql.php b/includes/db/DatabaseMysql.php
index 31de6309c7..e985854353 100644
--- a/includes/db/DatabaseMysql.php
+++ b/includes/db/DatabaseMysql.php
@@ -289,6 +289,10 @@ class DatabaseMysql extends DatabaseBase {
 		return '[http://www.mysql.com/ MySQL]';
 	}
 
+	function standardSelectDistinct() {
+		return false;
+	}
+
 	/**
 	 * @return String: Database type for use in messages
 	*/