Add example in readme.

README.md

@@ -120,6 +120,31 @@ with Flow(...) as flow:
     close_ssh_tunnel.run(tunnel=tunnel, upstream_tasks=[mysql_closed])
 ```
 
+**Use SQL transactions and dry running**
+
+```python
+from lolafect.connections import connect_to_mysql, close_mysql_connection
+from lolafect.utils import begin_sql_transaction, end_sql_transaction
+
+with Flow(...) as flow:
+    connection = connect_to_mysql(
+        mysql_credentials={...}, # You probably want to get this from TEST_LOLACONFIG.DW_CREDENTIALS
+    )
+    transaction_started = begin_sql_transaction(connection)
+    task_result = some_task_that_needs_mysql(
+        connection=connection,
+        upstream_task=[transaction_started]
+    )
+    transaction_finished = end_sql_transaction(
+        connection, 
+        dry_run=False, # True means rollback, False means commit changes
+        upstream_tasks=[task_result]
+    )
+    
+    close_mysql_connection(connection=connection, upstream_tasks=[transaction_finished])
+
+```
+
 ### Use Great Expectations
 
 **Run a Great Expectations validation on a MySQL query**