add ResultSet#exec to ensure the query is performed. By default generates a move_next.

src/db/result_set.cr

@@ -15,6 +15,12 @@ module DB
       @statement.close
     end
 
+    # :nodoc:
+    # Ensures it executes the query
+    def exec
+      move_next
+    end
+
     abstract def move_next : Bool
 
     # TODO def empty? : Bool, handle internally with move_next (?)

src/db/statement.cr

@@ -7,7 +7,9 @@ module DB
     end
 
     def exec(*args)
-      execute(*args).close
+      query(*args) do |rs|
+        rs.exec
+      end
     end
 
     def scalar(*args)