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app.py
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app.py
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#!/usr/bin/env python
import eventlet
eventlet.monkey_patch()
from eventlet import sleep
from itertools import islice
import os
import pyodbc
from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker
from toolz.curried import concat
import urllib
conn_str_mssql = "DRIVER={{{}}};SERVER={};DATABASE={};UID={};PWD={}".format(
os.environ["MSSQL_DRIVER"],
os.environ["MSSQL_HOST"],
os.environ["MSSQL_CATALOG"],
os.environ["MSSQL_USER"],
os.environ["MSSQL_PASS"],
)
cstr = "mssql+pyodbc:///?odbc_connect={}".format(
urllib.parse.quote_plus(conn_str_mssql)
)
cstr_psql = "postgresql+psycopg2://{}:{}@{}:{}/{}".format(
urllib.parse.quote_plus(os.environ["PSQL_USER"]),
urllib.parse.quote_plus(os.environ["PSQL_PASS"]),
urllib.parse.quote_plus(os.environ["PSQL_HOST"]),
urllib.parse.quote_plus(os.environ["PSQL_PORT"]),
urllib.parse.quote_plus(os.environ["PSQL_SCHEMA"]),
)
db_engine_mssql = create_engine(cstr)
db_engine_postgresql = create_engine(cstr_psql)
db_sessionmaker_mssql = sessionmaker(bind=db_engine_mssql)
db_sessionmaker_postgresql = sessionmaker(bind=db_engine_postgresql)
def _fetchall_with_sleep(result_proxy):
while True:
# recs = result_proxy.fetchmany(size=1000)
recs = result_proxy.fetchmany(1000)
if not recs:
break
yield recs
sleep()
def fetchall_with_sleep(result_proxy):
for x in concat(_fetchall_with_sleep(result_proxy)):
yield x
sleep()
sql_mssql = """
WITH x AS (SELECT n FROM (VALUES (0),(1),(2),(3),(4),(5),(6),(7),(8),(9)) v(n))
SELECT ones.n + 10*tens.n + 100*hundreds.n + 1000*thousands.n + 10000*tenthous.n + 100000*hunthous.n + 1000000*mil.n n
FROM x ones, x tens, x hundreds, x thousands, x tenthous, x hunthous, x mil
ORDER BY 1"""
def mssql_sqlalchemy(i, *args, **kwargs):
sess_mssql = None
try:
print("pre busy mssql")
sess_mssql = db_sessionmaker_mssql()
recs = sess_mssql.execute(sql_mssql)
print(", ".join(str(x[0]) for x in islice(fetchall_with_sleep(recs), 10)))
print("post busy mssql")
return f"{i}: mssql done"
finally:
if sess_mssql:
sess_mssql.close()
def mssql_pyodbc(i, *args, **kwargs):
cnxn = None
try:
print("pre busy mssql")
cnxn = pyodbc.connect(conn_str_mssql)
cursor = cnxn.cursor()
cursor.execute(sql_mssql)
print(", ".join(str(x[0]) for x in islice(fetchall_with_sleep(cursor), 10)))
print("post busy mssql")
return f"{i}: mssql done"
finally:
if cnxn:
cnxn.close()
def psql_sqlalchemy(i, *args, **kwargs):
sess_psql = None
try:
print("pre busy postgresql")
sess_psql = db_sessionmaker_postgresql()
recs = sess_psql.execute("SELECT * FROM generate_series(1,1000000)")
print(", ".join(str(x[0]) for x in islice(fetchall_with_sleep(recs), 10)))
print("post busy postgresql")
return f"{i}: psql done"
finally:
if sess_psql:
sess_psql.close()
if __name__ == "__main__":
pool = eventlet.GreenPool()
for data in pool.imap(mssql_pyodbc, range(1, 16)):
print(data)