NSLog data-bytes instead of data-self when traceExecution=YES.

src/FMDatabase.m

@@ -626,7 +626,12 @@ - (FMResultSet *)executeQuery:(NSString *)sql withArgumentsInArray:(NSArray*)arr
             }
             
             if (_traceExecution) {
-                NSLog(@"obj: %@", obj);
+                if ([obj isKindOfClass:[NSData class]]) {
+                    NSLog(@"data: %d byte", [(NSData*)obj length]);
+                }
+                else {
+                    NSLog(@"obj: %@", obj);
+                }
             }
             
             idx++;
@@ -811,7 +816,12 @@ - (BOOL)executeUpdate:(NSString*)sql error:(NSError**)outErr withArgumentsInArra
             }
             
             if (_traceExecution) {
-                NSLog(@"obj: %@", obj);
+                if ([obj isKindOfClass:[NSData class]]) {
+                    NSLog(@"data: %d byte", [(NSData*)obj length]);
+                }
+                else {
+                    NSLog(@"obj: %@", obj);
+                }
             }
             
             idx++;