Index: t3lib/class.t3lib_db.php
===================================================================
--- t3lib/class.t3lib_db.php	(Revision 6417)
+++ t3lib/class.t3lib_db.php	(Arbeitskopie)
@@ -1252,15 +1252,35 @@
 
 		$error = $this->sql_error();
 		if ($error) {
-			debug(
-				array(
-					'caller' => 't3lib_DB::' . $func,
-					'ERROR' => $error,
-					'lastBuiltQuery' => ($query ? $query : $this->debug_lastBuiltQuery),
-					'debug_backtrace' => t3lib_div::debug_trail(),
-				),
-				'SQL debug'
-			);
+				// Backend: Use flash messages to visualize the information
+			if (TYPO3_MODE === 'BE') {
+				$message = t3lib_div::view_array(
+					array(
+						'caller' => 't3lib_DB::' . $func,
+						'lastBuiltQuery' => ($query ? $query : $this->debug_lastBuiltQuery),
+						'debug_backtrace' => t3lib_div::debug_trail(),
+					)
+				);
+				$flashMessage = t3lib_div::makeInstance(
+					't3lib_FlashMessage',
+					$message,
+					'TYPO3 Database Error: ' . $error,
+					t3lib_FlashMessage::ERROR
+				);
+				t3lib_FlashMessageQueue::addMessage($flashMessage);
+				// Frontend: Output directly
+			} else {
+				debug(
+					array(
+						'caller' => 't3lib_DB::' . $func,
+						'ERROR' => $error,
+						'lastBuiltQuery' => ($query ? $query : $this->debug_lastBuiltQuery),
+						'debug_backtrace' => t3lib_div::debug_trail(),
+					),
+					'SQL debug'
+				);
+			}
+			
 		}
 	}