如何让Flask SQLAlchemy重用db连接？
如何让Flask SQLAlchemy重用db连接？
提问于 2012-05-16 15:22:59
我似乎无法让我的Flask应用程序关闭或重用数据库连接。我使用的是PostgreSQL 9.1.3
Flask==0.8
Flask-SQLAlchemy==0.16
psycopg2==2.4.5当我的测试套件运行时，打开的连接数一直攀升到20 (postgresql.conf中的max_connections设置)，然后我看到：
OperationalError: (OperationalError) FATAL: sorry, too many clients already
None None我已经将代码减少到只调用create_all和drop_all (但不发出任何sql，因为没有模型)的地步。
我在日志中看到正在检查的连接：
DEBUG:sqlalchemy.pool.QueuePool:Connection <connection object at 0x101c1dff0; dsn: 'dbname=cx_test host=localhost', closed: 0> checked out from pool
DEBUG:sqlalchemy.pool.QueuePool:Connection <connection object at 0x101c1dff0; dsn: 'dbname=cx_test host=localhost', closed: 0> being returned to pool
WARNING:root:impl <-------- That's the test running
DEBUG:sqlalchemy.pool.QueuePool:Connection <connection object at 0x101c1dff0; dsn: 'dbname=cx_test host=localhost', closed: 0> checked out from pool
DEBUG:sqlalchemy.pool.QueuePool:Connection <connection object at 0x101c1dff0; dsn: 'dbname=cx_test host=localhost', closed: 0> being returned to pool对于每个测试运行，连接的地址(“xyz处的连接对象”部分)是不同的。我怀疑这与问题有关，但我不确定如何进一步调查。
下面的代码在一个新的venv中重现这个问题：
from flask import Flask
from flask.ext.sqlalchemy import SQLAlchemy
from unittest import TestCase
import logging
logging.basicConfig(level=logging.DEBUG)
logging.getLogger('sqlalchemy.pool').setLevel(logging.DEBUG)
logging.getLogger('sqlalchemy.engine').setLevel(logging.DEBUG)
logging.getLogger('sqlalchemy.dialects').setLevel(logging.DEBUG)
logging.getLogger('sqlalchemy.orm').setLevel(logging.DEBUG)
db = SQLAlchemy()
def create_app(config=None):
app = Flask(__name__)
app.config.from_object(config)
db.init_app(app)
return app
class AppTestCase(TestCase):
SQLALCHEMY_DATABASE_URI = "postgresql://localhost/cx_test"
TESTING = True
def create_app(self):
return create_app(self)
def setUp(self):
self.app = self.create_app()
self.client = self.app.test_client()
self._ctx = self.app.test_request_context()
self._ctx.push()
db.create_all()
def tearDown(self):
db.session.remove()
db.drop_all()
self._ctx.pop()
class TestModel(AppTestCase):
def impl(self):
logging.warn("impl")
pass
def test_01(self):
self.impl()
def test_02(self):
self.impl()
def test_03(self):
self.impl()
def test_04(self):
self.impl()
def test_05(self):
self.impl()
def test_06(self):
self.impl()
def test_07(self):
self.impl()
def test_08(self):
self.impl()
def test_09(self):
self.impl()
def test_10(self):
self.impl()
def test_11(self):
self.impl()
def test_12(self):
self.impl()
def test_13(self):
self.impl()
def test_14(self):
self.impl()
def test_15(self):
self.impl()
def test_16(self):
self.impl()
def test_17(self):
self.impl()
def test_18(self):
self.impl()
def test_19(self):
self.impl()
if __name__ == "__main__":
import unittest
unittest.main()这是我第一次在flask中使用应用程序工厂，我部分地从Flask-SQLAlchemy docs复制了这段代码。Elseware那些文档提到，在错误的上下文中使用数据库会导致连接泄漏-也许我做的初始化是错误的？
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/10613812
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