update:完善数据库和Kafka相关结构

dao/db/example.py

@@ -0,0 +1,23 @@
+from dao.db.util import get_connet
+
+def exmaple_query():
+    with get_connet() as conn:
+        cursor = conn.cursor()
+        cursor.execute("select * from user")
+        for row in cursor.fetchall():
+            print(row)
+        cursor.close()
+
+def exmaple_insert():
+    with get_connet() as conn:
+        with conn.cursor() as cursor:
+            cursor.execute("insert into user(name, age) values('test', 18)")
+            conn.commit()
+            cursor.close()
+
+def exmaple_update():
+    with get_connet() as conn:
+        with conn.cursor() as cursor:
+            cursor.execute("update user set age=19 where name='test'")
+            conn.commit()
+            cursor.close()

dao/db/util.py

@@ -0,0 +1,15 @@
+from conf.util import get_config_object
+import pymysql
+
+conf = get_config_object()
+
+
+
+host = conf.get('database', 'host')
+port = conf.getint('database', 'port')
+user = conf.get('database', 'user')
+password = conf.get('database', 'password')
+database = conf.get('database', 'database')
+
+def get_connet() -> pymysql.Connection:
+    return pymysql.connect(host=host, port=port, user=user, password=password, database=database, charset='utf8')