From cad68137a7f461a9308a0b53ab1ac86482206a54 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Rodrigo=20Ram=C3=ADrez=20Norambuena?= <a@rodrigoramirez.com>
Date: Tue, 19 Sep 2017 07:22:50 -0300
Subject: [PATCH] res_config_pgsql: Fix removed support to previous for
 versions PostgreSQL 9.1

In PostgreSQL 9.1 the backslash are string literals and not the escape
of characters.

In previous issue ASTERISK_26057 was fixed the use of escape LIKE but the
support for old version of Postgresql than 9.1 was dropped. The sentence
before make was "ESCAPE '\'" but in version before than 9.1  need it to be
as follow "ESCAPE '\\'".

ASTERISK-27283

Change-Id: I96d9ee1ed7693ab17503cb36a9cd72847165f949
---
 res/res_config_pgsql.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/res/res_config_pgsql.c b/res/res_config_pgsql.c
index 536c9e1733..2310f39def 100644
--- a/res/res_config_pgsql.c
+++ b/res/res_config_pgsql.c
@@ -52,6 +52,7 @@ AST_THREADSTORAGE(semibuf_buf);
 static PGconn *pgsqlConn = NULL;
 static int version;
 #define has_schema_support	(version > 70300 ? 1 : 0)
+#define USE_BACKSLASH_AS_STRING	(version >= 90100 ? 1 : 0)
 
 #define MAX_DB_OPTION_SIZE 64
 
@@ -384,7 +385,7 @@ static struct columns *find_column(struct tables *t, const char *colname)
 }
 
 #define IS_SQL_LIKE_CLAUSE(x) ((x) && ast_ends_with(x, " LIKE"))
-static char *ESCAPE_CLAUSE = " ESCAPE '\\'";
+#define ESCAPE_CLAUSE (USE_BACKSLASH_AS_STRING ? " ESCAPE '\\'" : " ESCAPE '\\\\'")
 
 static struct ast_variable *realtime_pgsql(const char *database, const char *tablename, const struct ast_variable *fields)
 {
-- 
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