Apply (modified) patch by Mwmaps

https://www.mediawiki.org/wiki/Extension_talk:Maps#Creating_maps_layers_table_..._Database.php:_Could_not_open_file._41933

ProfessionalWiki#30

Maps.hooks.php

@@ -98,22 +98,20 @@ public static function onCanonicalNamespaces( array &$list ) {
 	 *
 	 * @since 3.0
 	 *
-	 * @global type $wgDBtype
 	 * @param DatabaseUpdater $updater
 	 *
 	 * @return true 
 	 */
 	public static function onLoadExtensionSchemaUpdates( DatabaseUpdater $updater ) {
-		global $wgDBtype;
-
-		switch( $wgDBtype ) {
+		switch( $GLOBALS['wgDBtype'] ) {
 			case 'mysql':
 			case 'sqlite':
-				$sqlPath = dirname( __FILE__ ) . '/schema/MapsLayers.sql';
-			break;
-			/** @ToDo: Support for Postgree SQL and others **/
+				$updater->addExtensionTable( 'maps_layers', __DIR__ . '/schema/MapsLayers.sql' );
+				break;
+			case 'postgres':
+				$updater->addExtensionTable( 'maps_layers', __DIR__ . '/schema/MapsLayers-postgres.sql' );
+				break;
 		}
-		$updater->addExtensionTable( 'maps_layers', $sqlPath );
 
 		return true;
 	}

schema/MapsLayers-postgres.sql

@@ -0,0 +1,10 @@
+BEGIN;
+
+CREATE TABLE maps_layers (
+ layer_page_id INTEGER NOT NULL REFERENCES page(page_id) ON DELETE CASCADE,
+ layer_name    VARCHAR(64) DEFAULT NULL,
+ layer_type    VARCHAR(32) NOT NULL,
+ layer_data    TEXT NOT NULL
+) /*$wgDBTableOptions*/;
+
+COMMIT;