first commit

CRUDManager.py

@@ -0,0 +1,36 @@
+from DbSetup import engine, session, databaseUrl
+import pandas as pd
+from sqlalchemy import desc, select
+from Tables import Toots
+
+class CRUDManager():
+
+    def saveToDatabase(self, dataframe, table:str, useIndex=False):
+        try:
+            dataframe.to_sql(table, engine, index=useIndex, if_exists="append")
+        except:
+            print(f'Could not save data to {table}!')
+
+    def loadFromDatabase(self, table:str, indexColumn=None):
+        return pd.read_sql_table(table, databaseUrl, index_col=indexColumn)
+
+    def getLastToot(self):
+        stmt = select(Toots.tootId).order_by(desc('datetime'))
+        return session.scalars(stmt).first()
+
+    def calculateAggregates(self, column, aggregate='Count'):
+        if (aggregate=='Count'):
+            addGroup = f', {column} '
+        else:
+            addGroup = ''
+        query = f'''SELECT DATE(datetime) as date {addGroup}, {aggregate}({column}) as {column}{aggregate}
+                    FROM Toots
+                    GROUP BY DATE(datetime)''' \
+                    + addGroup \
+                    + '''HAVING datetime >= DATE("now","-1 day")
+                    AND datetime < DATE("now")'''
+        return pd.read_sql(
+            query,
+            databaseUrl,
+            parse_dates=["datetime"]
+            )