From 83e5074461898046c33112249788883ea2547493 Mon Sep 17 00:00:00 2001
From: Kevin Locke <kevin@kevinlocke.name>
Date: Wed, 3 Jun 2015 01:12:12 -0600
Subject: [PATCH] Add support for sql_mode variable

This appears as both "SELECT @@SESSION.sql_mode" checked from wp-db.php
in Wordpress core during startup and as "SHOW VARIABLES LIKE 'sql_mode'"
in several extensions (all-in-one-seo-pack, flash-album-gallery, and
nextgen-gallery on my system).  Support both by returning the empty
string, which reports the default MySQL behavior (and avoids attempts to
change the mode, since all current code expects this).

Signed-off-by: Kevin Locke <kevin@kevinlocke.name>
---
 pg4wp/driver_pgsql.php         | 4 ++++
 pg4wp/driver_pgsql_install.php | 9 ++++++++-
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/pg4wp/driver_pgsql.php b/pg4wp/driver_pgsql.php
index 637bbbd..c4dd3fb 100644
--- a/pg4wp/driver_pgsql.php
+++ b/pg4wp/driver_pgsql.php
@@ -270,6 +270,10 @@
 			// MySQL 'IF' conversion - Note : NULLIF doesn't need to be corrected
 			$pattern = '/ (?<!NULL)IF[ ]*\(([^,]+),([^,]+),([^\)]+)\)/';
 			$sql = preg_replace( $pattern, ' CASE WHEN $1 THEN $2 ELSE $3 END', $sql);
+
+			// Act like MySQL default configuration, where sql_mode is ""
+			$pattern = '/@@SESSION.sql_mode/';
+			$sql = preg_replace( $pattern, "''", $sql);
 			
 			$sql = str_replace('GROUP BY '.$wpdb->prefix.'posts.ID', '' , $sql);
 			$sql = str_replace("!= ''", '<> 0', $sql);
diff --git a/pg4wp/driver_pgsql_install.php b/pg4wp/driver_pgsql_install.php
index 3216aa2..7c0e437 100644
--- a/pg4wp/driver_pgsql_install.php
+++ b/pg4wp/driver_pgsql_install.php
@@ -41,8 +41,15 @@
 		// Emulate SHOW commands
 		if( 0 === strpos( $sql, 'SHOW') || 0 === strpos( $sql, 'show'))
 		{
+			// SHOW VARIABLES LIKE emulation for sql_mode
+			// Used by nextgen-gallery plugin
+			if( 0 === strpos( $sql, "SHOW VARIABLES LIKE 'sql_mode'"))
+			{
+				// Act like MySQL default configuration, where sql_mode is ""
+				$sql = 'SELECT \'sql_mode\' AS "Variable_name", \'\' AS "Value";';
+			}
 			// SHOW COLUMNS emulation
-			if( preg_match('/SHOW\s+(FULL\s+)?COLUMNS\s+(?:FROM\s+|IN\s+)`?(\w+)`?(?:\s+LIKE\s+(.+)|\s+WHERE\s+(.+))?/i', $sql, $matches))
+			elseif( preg_match('/SHOW\s+(FULL\s+)?COLUMNS\s+(?:FROM\s+|IN\s+)`?(\w+)`?(?:\s+LIKE\s+(.+)|\s+WHERE\s+(.+))?/i', $sql, $matches))
 			{
 				$logto = 'SHOWCOLUMN';
 				$full = $matches[1];