add docker compose (#8)

* add docker compose

* add docker compose

python/util/db_conn.py

@@ -0,0 +1,44 @@
+import logging
+import time
+from util import config
+import pandas as pd
+
+class Postgre(object):
+    def __init__(self, env, dbnm):
+        self.config = config.init(env)
+        self.conn = None
+        self.dbnm = dbnm
+        self.__open__()
+
+    def __open__(self):
+        import psycopg2
+        try:
+            if self.conn:self.__close__()
+            del self.conn
+        except Exception as e:
+            pass
+
+        try:
+            self.conn = psycopg2.connect(f"dbname={self.dbnm} user={self.config.get('pgdb_usr')} password={self.config.get('pgdb_pwd')} host={self.config.get('pgdb_host')} port={self.config.get('pgdb_port')}")
+        except Exception as e:
+            logging.error("Fail to connect %s "%self.config.get("pgdb_host") + str(e))
+
+
+    def __close__(self):
+        try:
+            self.conn.close()
+        except Exception as e:
+             logging.error("Fail to close %s "%self.config.get("pgdb_host") + str(e))
+
+
+    def select(self, sql):
+        for _ in range(10):
+            try:
+                return pd.read_sql(sql, self.conn)
+            except Exception as e:
+                logging.error(f"Fail to exec {sql}l  "+str(e))
+                self.__open__()
+                time.sleep(1)
+
+        return pd.DataFrame()
+