add mysql flow example

examples/task_library/mysql/mysql_flow.py

@@ -0,0 +1,38 @@
+from prefect.tasks.mysql.mysql import MySQLFetch, MySQLExecute
+from prefect import Flow, task
+
+EXAMPLE_TABLE = 'user'
+HOST = 'localhost'
+PORT = 3306
+DB_NAME = 'ext'
+USER = 'admin'
+PASSWORD = 'admin'
+
+
+mysql_fetch = MySQLFetch(
+    host=HOST, port=PORT, db_name=DB_NAME, user=USER, password=PASSWORD
+)
+
+mysql_exec = MySQLExecute(
+    host=HOST, port=PORT, db_name=DB_NAME, user=USER, password=PASSWORD
+)
+
+
+@task
+def print_results(x):
+    print(x)
+
+
+with Flow('MySQL Example') as flow:
+    # fetch 3 results
+    fetch_results = mysql_fetch(
+        query=f'SELECT * FROM {EXAMPLE_TABLE}', fetch='many', fetch_count=3
+    )
+    print_results(fetch_results)
+
+    # execute a query that returns 3 results
+    exec_results = mysql_exec(query=f'SELECT * FROM {EXAMPLE_TABLE} LIMIT 3')
+    print_results(exec_results)
+
+
+flow.run()