Update readme

Author: methane

README.rst

@@ -12,17 +12,69 @@ This package contains a fork of PyMySQL supporting Tornado.
 Example
 -------
 
-Simple
+example
 ~~~~~~~
 
-.. include:: example.py
-    :code: python
+::
 
-pool
-~~~~~
+    #!/usr/bin/env python
+    from __future__ import print_function
+
+    from tornado import ioloop, gen
+    import tornado_mysql
+
+    @gen.coroutine
+    def main():
+        conn = yield tornado_mysql.connect(host='127.0.0.1', port=3306, user='root', passwd='', db='mysql')
+        cur = conn.cursor()
+        yield cur.execute("SELECT Host,User FROM user")
+        print(cur.description)
+        for row in cur:
+           print(row)
+        cur.close()
+        conn.close()
+
+    ioloop.IOLoop.current().run_sync(main)
+
+example_pool
+~~~~~~~~~~~~
+
+::
+
+    #!/usr/bin/env python
+    from __future__ import print_function
+
+    from tornado import ioloop, gen
+    from tornado_mysql import pools
+
+
+    pools.DEBUG = True
+
+
+    POOL = pools.Pool(
+        dict(host='127.0.0.1', port=3306, user='root', passwd='', db='mysql'),
+        max_idle_connections=1,
+        max_recycle_sec=3)
+
+
+    @gen.coroutine
+    def worker(n):
+        for i in range(10):
+            t = 1
+            print(n, "sleeping", t, "seconds")
+            cur = yield POOL.execute("SELECT SLEEP(%s)", (t,))
+            print(n, cur.fetchall())
+
+
+    @gen.coroutine
+    def main():
+        workers = [worker(i) for i in range(10)]
+        yield workers
+
+
+    ioloop.IOLoop.current().run_sync(main)
+    print(POOL._opened_conns)
 
-.. include:: example_pool.py
-    :code: python
 
 Requirements
 -------------

example_pool.py

@@ -1,6 +1,5 @@
 #!/usr/bin/env python
 from __future__ import print_function
-import random
 
 from tornado import ioloop, gen
 from tornado_mysql import pools