From 13eecb92ffe9cccb74af8114a76da8184c37e833 Mon Sep 17 00:00:00 2001
From: Sam Morris <sam@robots.org.uk>
Date: Mon, 14 Feb 2011 12:11:44 -0800
Subject: [PATCH] Bug 616981: Make whine.pl work with PostgreSQL 8.4+ by fixing
 sql_string_until r=mkanat, a=mkanat

---
 Bugzilla/DB/Pg.pm | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/Bugzilla/DB/Pg.pm b/Bugzilla/DB/Pg.pm
index 9c785e580a..123040f739 100644
--- a/Bugzilla/DB/Pg.pm
+++ b/Bugzilla/DB/Pg.pm
@@ -184,6 +184,18 @@ sub sql_string_concat {
     return '(CAST(' . join(' AS text) || CAST(', @params) . ' AS text))';
 }
 
+sub sql_string_until {
+    my ($self, $string, $substring) = @_;
+
+    # PostgreSQL does not permit a negative substring length; therefore we
+    # use CASE to only perform the SUBSTRING operation when $substring can
+    # be found withing $string.
+    return "CASE WHEN " . $self->sql_position($substring, $string)
+                        . " != 0 THEN SUBSTRING($string FROM 1 FOR "
+                        . $self->sql_position($substring, $string) . " - 1)"
+		        . " ELSE $string END";
+}
+
 # Tell us whether or not a particular sequence exists in the DB.
 sub bz_sequence_exists {
     my ($self, $seq_name) = @_;
-- 
2.47.2