dataprep4

rowers/dataprep.py

@@ -32,7 +32,6 @@ if settings.DEBUG or user=='':
     # database_url = 'sqlite:///db.sqlite3'
     database_url = 'sqlite:///'+database_name
 
-engine = create_engine(database_url, echo=False)
 
 from scipy.signal import savgol_filter
 
@@ -85,6 +84,7 @@ def rdata(file,rower=rrower()):
     return res
 
 def delete_strokedata(id):
+    engine = create_engine(database_url, echo=False)
     query = sa.text('DELETE FROM strokedata * WHERE workoutid={id};'.format(
         id=id,
     ))
@@ -94,6 +94,7 @@ def delete_strokedata(id):
         except:
             print "Database Locked"
     conn.close()
+    engine.dispose()
 
 def testdata(time,distance,pace,spm):
     t1 = np.issubdtype(time,np.number)
@@ -151,11 +152,14 @@ def getrowdata(id=0):
 
 def prepmultipledata(ids,verbose=False):
     query = sa.text('SELECT DISTINCT workoutid FROM strokedata')
+    engine = create_engine(database_url, echo=False)
+
     with engine.connect() as conn, conn.begin():
         res = conn.execute(query)
         res = list(itertools.chain.from_iterable(res.fetchall()))
     conn.close()
-        
+    engine.dispose()
+    
     res = list(set(ids)-set(res))
     for id in res:
         rowdata,row = getrowdata(id=id)
@@ -170,6 +174,8 @@ def read_cols_df_sql(ids,columns):
     columns = [x for x in columns if x != 'None']
     columns = list(set(columns))
     cls = ''
+    engine = create_engine(database_url, echo=False)
+
     for column in columns:
         cls += column+', '
     cls = cls[:-2]
@@ -189,12 +195,17 @@ def read_cols_df_sql(ids,columns):
         ))
         
     df = pd.read_sql_query(query,engine)
+    engine.dispose()
     return df
         
 
 def read_df_sql(id):
+    engine = create_engine(database_url, echo=False)
+
     df = pd.read_sql_query(sa.text('SELECT * FROM strokedata WHERE workoutid={id}'.format(
         id=id)), engine)
+
+    engine.dispose()
     return df
 
 
@@ -353,8 +364,9 @@ def dataprep(rowdatadf,id=0,bands=False,barchart=False,otwpower=False):
     # write data if id given
     if id != 0:
         data['workoutid'] = id
+        engine = create_engine(database_url, echo=False)
         with engine.connect() as conn, conn.begin():
             data.to_sql('strokedata',engine,if_exists='append',index=False)
         conn.close()
-            
+        engine.dispose()    
     return data

rowers/models.py

@@ -31,7 +31,6 @@ database_url = 'mysql://{user}:{password}@{host}:{port}/{database_name}'.format(
 if settings.DEBUG or user=='':	    
     database_url = 'sqlite:///db.sqlite3'
 
-engine = create_engine(database_url, echo=False)
 
 # Create your models here.
 class Team(models.Model):
@@ -149,13 +148,15 @@ def auto_delete_strokedata_on_delete(sender, instance, **kwargs):
         query = sa.text('DELETE FROM strokedata WHERE workoutid={id};'.format(
             id=instance.id,
             ))
+        engine = create_engine(database_url, echo=False)
         with engine.connect() as conn, conn.begin():
             try:
                 result = conn.execute(query)
             except:
                 print "Database Locked"
         conn.close()
-                
+        engine.dispose()
+        
 class StrokeData(models.Model):
     class Meta:
         db_table = 'strokedata'