Added structure which can be cloned for multiple test cases.

server/modules/routing/readwritesplit/test/test_transaction_routing1.sql

@@ -0,0 +1,21 @@
+USE test; 
+SET autocommit = 0; 
+SET @a= -1; 
+SET @b = -2; 
+START TRANSACTION; 
+CREATE TABLE IF NOT EXISTS myCity (a int, b char(20)); 
+INSERT INTO myCity VALUES (1, 'Milan'); 
+INSERT INTO myCity VALUES (2, 'London'); 
+COMMIT;
+-- Now there are two values
+START TRANSACTION; 
+DELETE FROM myCity; 
+-- Now there are zero values
+SET @a = (SELECT COUNT(1) FROM myCity); -- implicit COMMIT for DELETE operation
+ROLLBACK; -- nothing to roll back 
+START TRANSACTION; 
+SET @b = (SELECT COUNT(*) FROM myCity); -- implicit COMMIT for empty trx
+START TRANSACTION; 
+DROP TABLE myCity; 
+SELECT (@a+@b) AS res; -- counts 0+0 ans sets the result to 'res'
+COMMIT;