我有两个用于查询数据库的函数。假设有两个单独的查询，如何并行运行它们以查询同一个数据库，并在继续执行其余代码之前等待两个结果返回？
def query1(param1, param2):
result = None
logging.info("Connecting to database...")
try:
conn = connect(host=host, port=port, database=db)
curs = conn.cursor()
curs.execute(query)
result = curs
curs.close()
conn.close()
except Exception as e:
logging.error("Unable to access database %s" % str(e))
return result
def query2(param1, param2):
result = None
logging.info("Connecting to database...")
try:
conn = connect(host=host, port=port, database=db)
curs = conn.cursor()
curs.execute(query)
result = curs
curs.close()
conn.close()
except Exception as e:
logging.error("Unable to access database %s" % str(e))
return result
最佳答案
这是一个多线程代码，可以完成您要完成的任务:
from threading import Thread, Lock
class DatabaseWorker(Thread):
__lock = Lock()
def __init__(self, db, query, result_queue):
Thread.__init__(self)
self.db = db
self.query = query
self.result_queue = result_queue
def run(self):
result = None
logging.info("Connecting to database...")
try:
conn = connect(host=host, port=port, database=self.db)
curs = conn.cursor()
curs.execute(self.query)
result = curs
curs.close()
conn.close()
except Exception as e:
logging.error("Unable to access database %s" % str(e))
self.result_queue.append(result)
delay = 1
result_queue = []
worker1 = DatabaseWorker("db1", "select something from sometable",
result_queue)
worker2 = DatabaseWorker("db1", "select something from othertable",
result_queue)
worker1.start()
worker2.start()
# Wait for the job to be done
while len(result_queue) < 2:
sleep(delay)
job_done = True
worker1.join()
worker2.join()
关于python - 如何使用python并行查询数据库，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/37975904/