Psycopg2 Threadedconnectionpool

django-db-pool is unavailable in PyPM, because there aren't any builds for it in the package repositories. Is this a problem with psycopg2's C libraries running in the Cloud Function's environment? How do I fix google-cloud-functions psycopg2. App Engine は Cloud SQL インスタンスへのコネクタをサポートしています。次の例では、パッケージ PyMySQL を SQLAlchemy(MySQL の場合)と psycopg2(PostgresSQL の場合)で使用します。. This is not on by default because this is not a psycopg2 package. python-psycopg2 ya está en su versión más reciente. GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. When libtree is used in a threaded environment (usually in production), it's recommended to use a pool object. pool import ThreadedConnectionPool,SimpleConnectionPool,PersistentConnectionPool from constant. This module offers a few pure Python classes implementing simple connection pooling directly in the client application. pool) threadsafety (in module psycopg2) TIME (in module psycopg2. Hola a todos, Estoy todavía intentando instalar GNU health pero ahora en ubuntu lucid lynx y me gustaría preguntaros como habéis instalado tryton con todo lo necesario ya que me sigue dando errores de dependencias entre otros. Cloud SQL is a fully managed database service that makes it easy to set up, maintain, manage, and administer your relational databases on Google Cloud Platform. If decide not use pgbouncer I think pooler is required. Its main advantages are that it supports the full Python DB API 2. class psycopg2. 1 Votes 1422 Views. Creating new PostgreSQL connections can be an expensive operation. SimpleConnectionPool(minconn, maxconn, *args, **kwargs) A connection pool that can't be shared across different threads. pool – Connections pooling¶. By voting up you can indicate which examples are most useful and appropriate. from psycopg2. py <- Inicialización de la web app y varios componentes requeridos config. Столкнулся с ошибкой, которую не могу уже некоторое время побороть. I'm using psycopg2. python psycopg2 连接pg 建立连接池 摘要:# -*- coding: utf-8 -*-from psycopg2. pool import ThreadedConnectionPool,SimpleConnectionPool,PersistentConnectionPool from constant import pg_name, pg_user, pg_pw, pg_host, pg_port from public import gen_sql. callproc is used for quering DB. SQLALchemy - SQLALchemyされたスレッドとgevent-psycopg2正しく動作するようgevent-psycopg2 。 QueuePoolクラスはthreadingモジュールを内部的に使用してロックするので、 gevent-psycopg2がpsycopg2緑色にしても、猿のパッチが必要です。 例ではpsycopg2 接続プーリングの例がgeventます. Je suppose que vous savez gevent-psycopg2 module, ce qui rend psycopg greenlet de l'environnement. 我正在开发Flask API,我有以下代码使用Psycopg2建立连接池. index; modules | Psycopg 2. class psycopg2. Content and talk by Niels Zeilemaker (GoDataDriven): "Embarrassingly parallel database calls with Python" Abstract: Have you ever squeezed your SQL queries to…. ThreadedConnectionPool(minconn, maxconn, *args, **kwargs) 一个连接池与线程模块一起工作。 注意这个池类可以安全地应用在多线程应用程序中。. Mailing List [email protected] 7 64 bit, PythonXY with Spyder). Is is described in README in more details. Content and talk by Niels Zeilemaker (GoDataDriven): "Embarrassingly parallel database calls with Python" Abstract: Have you ever squeezed your SQL queries to…. class psycopg2. Bases: object Variant mapping and validation requires access to external data, specifically exon structures, transcript alignments, and protein accessions. Concurrrency issue with psycopg2. For multi-threaded operation, use a connection pool such as psycopg2. pool - Connections pooling¶. They are extracted from open source Python projects. Database helpers. Niels Zeilemaker (GoDataDriven): "Embarrassingly parallel database calls with Python" Abstract: Have you ever squeezed you SQL queries to the last millisecond,…. pool` -- Connections pooling =====. pool = ThreadedConnectionPool (1, 20, database = 'd2qn0biqr26ulk', user = 'ybpwrikucwedph',. from multiprocessing import Process. client import Client. PersistentConnectionPool(minconn, maxconn, *args, ** kwargs) A pool that assigns persistent connections to different. 有人可以解释一下如何在当前数据库中获取表?我正在使用postgresql-8. > > Why? > > This an honest question. Programming with Python and PostgreSQL 1. Retry decorator. The task is use own RAW database connection instead of SQLAlchemy plugin together with Flask + uWSGI. ''' import contextlib import doctest import json import os import pkgutil import random import time import click import flask import psycopg2 import sqlalchemy import subprocess import sys import threading import traceback import unittest import werkzeug. 我想我应该考虑在程序终止时关闭连接池,我该怎么做?@contextmanager def get_cursor(: global connection_pool if not cls. multiprocessing is a package that supports spawning processes using an API similar to the threading module. 4 psycopg2。最佳答案pg_class存储所有必需的信息。执行下面的查询将返回用户定义的表作为列表中的元组conn = psycopg2. Python Postgres psycopg2 ThreadedConnectionPool exhausted. SimpleConnectionPool(minconn, maxconn, *args, **kwargs) A connection pool that can't be shared across different threads. Psycopg2 is a DB API 2. Estoy usando Flask, psycopg2 y wtforms. OK, I Understand. Tienes que tener una version mas reciente de pip. pool import ThreadedConnectionPool,SimpleConnectionPool,Persist Sql server2012连接Sql server 2008时出现的问题:已成功与服务器建立连接,但在登陆过程中发生错误。. client import Client. 我已经在这里查看了几个"太多客户"的相关主题,但仍然无法解决我的问题,所以我必须再次问这个,对我来说具体情况. cursor() cursor. ThreadedConnectionPool(minconn, maxconn, *args, ** kwargs) A connection pool that works with the threading module. 我想我应该考虑在程序终止时关闭连接池,我该怎么做?@contextmanager def get_cursor(: global connection_pool if not cls. A connection pool that works with the threading module. pool - Connections pooling Creating new PostgreSQL connections can be an expensive operation. pool import ThreadedConnectionPool #ESB Call from suds import WebFault from suds. > > As performance matters, I am using a ThreadedConnectionPool from > > psycopg2. The following are code examples for showing how to use psycopg2. 10 server this morning, using the deb package. It requires either a connection or pool object from the psycopg2 package. org F-Secure Corporation PostgreSQL Conference East 2011 CC-BY. Interface (mode=None, cache=None) ¶. GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. Project description. It was designed for heavily multi-threaded applications. The module provides a cursor context handler wrapping the psycopg2 cursor. ThreadConnectionPool for DB connection pooling and only cursor. pypgwrap - efficient PostgreSQL database wrapper ----- The 'efficient' module provides a efficient wrapper over psycopg2 supporting a Python API for common sql functions, explicit and implicit transactions mechanism and connection pooling. py仔细阅读一番,就会发现其实逻辑很简单。 class ThreadedConnectionPool(AbstractConnectionPool): """A connection pool that works with the threading module. By continuing to use Pastebin, you agree to our use of cookies as described in the Cookies Policy. Gzip compression shortcuts. The cursor object uses the psycopg2 'DictCursor' by default (which returns rows as a pseudo python dictionary) however this can be overridden by providing a 'cursor_factory' parameter to the constructor. from psycopg2. Its main advantages are that it supports the full Python DB API 2. """ Psycopg2. La puedes actualizar con: pip install -U pip > >El 18/08/14 12:43, Àngel Àlvarez Serra escribió:. 3、kafka,具体可以参考我前面的文章二、启动相应程序启动Zooke. pypgwrap - efficient PostgreSQL database wrapper ----- The 'efficient' module provides a efficient wrapper over psycopg2 supporting a Python API for common sql functions, explicit and implicit transactions mechanism and connection pooling. These mean that you have a connection that is not doing any active work (so it just sits on some resources), but it keeps all the locks it obtained earlier for however long the transaction will keep on going. How to reuse database connection in Flask If you want to do it yourself though this is exactly the problem that psycopg2. pool, but I also want to have my SQL statements prepared. In general, prepared statements do not provide significant performance improvements in PostgreSQL. One other interesting feature of the driver is that if you use the PostgreSQL array data type, Psycopg2 will automatically convert a result containing that data type to a Python lis. Added the new psycopg2. from pysimplesoap. callproc is used for quering DB. ThreadedConnectionPool(minconn, maxconn, *args, **kwargs) 一个连接池与线程模块一起工作。 注意这个池类可以安全地应用在多线程应用程序中。. This is not on by default because this is not a psycopg2 package. Pool vs a connection pool such as ThreadedConnectionPool gives me. cursor() cursor. ThreadConnectionPool for DB connection pooling and only cursor. As performance matters, I am using a ThreadedConnectionPool from psycopg2. I have looked into several 'too many clients' related topic here but still can't solve my problem, so I have to ask this again, for me specific case. The actual pool implementation is psycop2g's built-in ThreadedConnectionPool, which handles thread safety for the pool instance, as well as simple dead connection testing when connections are returned. 我正在使用psycopg2. Returns cursor object, so you can chain it with fetch* methods, etc. org F-Secure Corporation PostgreSQL Conference East 2011 CC-BY. connection_poo. GoDataDriven PROUDLY PART OF THE XEBIA GROUP @gglanzani {nielszeilemaker,giovannilanzani}@godatadriven. from psycopg2. La estructura de la aplicación es algo como: __init__. Programming with Python and PostgreSQL 1. python psycopg2 连接pg 建立连接池的更多相关文章 高性能网络编程(一)----accept建立连接 编写服务器时,许多程序员习惯于使用高层次的组件. 5 documentation ThreadedConnectionPool (class in psycopg2. Making Flask Play Nice with Subdomains. में आवेदन पूलिंग के लिए एक वैकल्पिक का उपयोग कर पूल करने के लिए है PgBouncer। आप अभी भी एक TCP कनेक्शन की भूमि के ऊपर और सेटअप का एक छोटा सा है, लेकिन है बड़े. Click the linked icons to find out why. Je suppose que vous savez gevent-psycopg2 module, ce qui rend psycopg greenlet de l'environnement. class psycopg2. Basically, I am trying to load data in parallel using ThreadedConnectionPool. org F-Secure Corporation PostgreSQL Conference East 2011 CC-BY. Because of this, several web server processes will clobber each other's connections to postgresql. Honestly I would keep it as simple as possible. py仔细阅读一番,就会发现其实逻辑很简单。 class ThreadedConnectionPool(AbstractConnectionPool): """A connection pool that works with the threading module. In order to demonstrate the code in this blog post, we need a database. connection) – psycopg2 connection object • pool (psycopg2. __name__() 。 模块列表. e is my > observed behavior a bug or a feature? You should ask the author[s] of "psycopg2" about the supposed behavior. py <- Inicialización de la web app y varios componentes requeridos config. pool from huey_pg import PostgresHuey pool = psycopg2. You probably want to make sure your database is created with the utf-8 encoding. extras import RealDictCursor from psycopg2. This means that psycopg2 was shared among multiple processes. Concurrrency issue with psycopg2. dev0 documentation ThreadedConnectionPool (class in psycopg2. Summary: Gunicorn will fork its workers after the psycopg2 connection pool has started multiplying connections to postgresql. Столкнулся с ошибкой, которую не могу уже некоторое время побороть. if _sa_class is not None and isinstance (statement, _sa_class):. Is is described in README in more details. Transaction Handling with Psycopg2 06 Dec 2017. execute('select r. Its main advantages are that it supports the full Python DB API 2. Python psycopg2 模块, pool() 实例源码. Здравствуйте! Разбираюсь с контекстными вызовами. module:: psycopg2. A connection pool that works with the threading module. > The simple connection pool is not appropriate for concurrent programs: > you should use probably the ThreadedConnectionPool, after checking. index; modules | Psycopg 2. pool - Connections pooling¶. The actual pool implementation is psycop2g's built-in ThreadedConnectionPool, which handles thread safety for the pool instance, as well as simple dead connection testing when connections are returned. from pysimplesoap. pool import ThreadedConnectionPool,SimpleConnectionPool,PersistentConnectionPool from constant. import threading. Se instalaron de forma automática los siguientes paquetes y ya no son necesarios. At a bare minimum, there are only two things that need to be done in order to make Flask work with subdomains: set the SERVER_NAME config value to :. 中间件(例如OO(面向对象)层层封装过的开源组件),相比于服务器的运行效率而言,他们更关注程序开发的效率,追求更快的完成. Its main advantages are that it supports the full Python DB API 2. Creating new PostgreSQL connections can be an expensive operation. Psycopg2 is a DB API 2. This means that psycopg2 was shared among multiple processes. Psycopg is the most popular PostgreSQL database adapter for the Python programming language. _psycopg import OperationalError" will still fail, the correct import is "from psycopg2 import OperationalError" - _psycopg is an internal module. ThreadedConnectionPool (1, n, dsn = d) for d in dsns] connections = [p. • connection (psycopg2. ThreadedConnectionPool(minconn, maxconn, *args, **kwargs) A connection pool that works with the threading module. I have since started using ThreadedConnectionPool and switched to threads (with processes I keep getting psycopg2. >>> db = pypgwrap. extras from psycopg2. Cloud SQL is a fully managed database service that makes it easy to set up, maintain, manage, and administer your relational databases on Google Cloud Platform. 5 documentation ThreadedConnectionPool (class in psycopg2. Note This pool class can be safely used in multi-threaded applications. 问题:有时,在并发请求期间,过程调用结果混淆,代码正在查询procedure_1但是正在获取procedure_2的结果(反之亦然,另一个并发客户端). parse as urlparse import psycopg2 from psycopg2. lobject method) Thread safety ThreadedConnectionPool (class in psycopg2. pool import ThreadedConnectionPool from redis import StrictRedis from. The problem disappears if processes is set to 1 in uwsgi. Its main advantages are that it supports the full Python DB API 2. It implements Python objects in C that call libpq functions. 基本上,我设置了我的本地Postgres服务器,需要做成千上万的查询,所以我使用了Python psycopg2package. Python psycopg2 模块, pool() 实例源码. pool import ThreadedConnectionPool pool = ThreadedConnectionPool(5,100,"dbname=你的数据库名 user=用户名 password=密码 host=主机名 port=端口号") #创建连接池连接 conn= pool. The following are code examples for showing how to use psycopg2. Click the linked icons to find out why. Psycopg is the most popular PostgreSQL database adapter for the Python programming language. When libtree is used in a single-threaded environment (usually during development), it's enough to pass a standard connection object. Как я могу объединить соединения с помощью psycopg и gevent? В документах psycopg указано: «Соединения Psycopg не являются безопасными для зеленого потока и не могут использоваться одновременно разными зелеными потоками. 我已经在这里查看了几个“太多客户”的相关主题,但仍然无法解决我的问题,所以我必须再次问这个,对我来说具体情况. What's a Schema? A postgresql database has one or more schemas which, in turn, contain one or more postgresql objects (tables, procedures, types, etc). _psycopg import OperationalError" will still fail, the correct import is "from psycopg2 import OperationalError" - _psycopg is an internal module. py <- Inicialización de la web app y varios componentes requeridos config. Spark Streaming连接kafka测试 - 在上次使用了下kafka,在此测试下CentOS 7中Spark streaming连接kafka,并把数据传入postgresql中一、环境部署安装python3. pool import ThreadedConnectionPool pool = ThreadedConnectionPool(5,100,"dbname=你的数据库名 user=用户名 password=密码 host=主机名 port=端口号") #创建连接池连接 conn= pool. > The simple connection pool is not appropriate for concurrent programs: > you should use probably the ThreadedConnectionPool, after checking. Creating new PostgreSQL connections can be an expensive operation. extras import RealDictCursor from psycopg2. I'm using Flask, psycopg2 and uWSGI. ''' import contextlib import doctest import json import os import pkgutil import random import time import click import flask import psycopg2 import sqlalchemy import subprocess import sys import threading import traceback import unittest import werkzeug. connection) - psycopg2 connection object • pool (psycopg2. import threading. ThreadedConnectionPool 你可能需要使用 utf-8 编码来确定你的数据库是否已经创建。. Summary: Gunicorn will fork its workers after the psycopg2 connection pool has started multiplying connections to postgresql. ImproperlyConfigured taken from open source projects. Bases: object Variant mapping and validation requires access to external data, specifically exon structures, transcript alignments, and protein accessions. For multi-threaded operation, use a connection pool such as psycopg2. ThreadConnectionPool进行数据库连接池,只有cursor. module:: psycopg2. pool - Connections pooling¶. getconn for p in pools] pdb = ParallelConnection (connections). ThreadedConnectionPool(minConnection, maxConnection, *args, **kwargs) Psycopg2's PersistentConnectionPool. Psycopg - PostgreSQL database adapter for Python¶. Database transactions blog post. pool) threadsafety (in module psycopg2) TIME (in module psycopg2. 在openerp-server. callproc is used for quering DB. Se instalaron de forma automática los siguientes paquetes y ya no son necesarios. 0 compliant PostgreSQL driver that is actively developed. execute('select r. Bases: object Variant mapping and validation requires access to external data, specifically exon structures, transcript alignments, and protein accessions. A connection pool that works with the threading module. (The opposite conversion was already working. You probably want to make sure your database is created with the utf-8 encoding. >>> db = pypgwrap. # psycopg2 is free software: you can redistribute it and/or modify it # under the terms of the GNU Lesser General Public License as published # by the Free Software Foundation, either version 3 of the License, or. Clone via HTTPS Clone with Git or checkout with SVN using the repository’s web address. getconn for p in pools] pdb = ParallelConnection (connections). __name__() 。 模块列表. 4 psycopg2。最佳答案pg_class存储所有必需的信息。执行下面的查询将返回用户定义的表作为列表中的元组conn = psycopg2. ThreadConnectionPool for DB connection pooling and only cursor. dataproviders. Connection pooling is implemented by thinly wrapping a psycopg2 connection object with a pool-aware class. python psycopg2 连接pg 建立连接池 utf-8 -*-from psycopg2. Se instalaron de forma automática los siguientes paquetes y ya no son necesarios. Is this a problem with psycopg2's C libraries running in the Cloud Function's environment? How do I fix google-cloud-functions psycopg2. 有人可以解释一下如何在当前数据库中获取表?我正在使用postgresql-8. class psycopg2. $ pip install psycopg2-binary The binary package is a practical choice for development and testing but in production it is advised to use the package built from sources. I have since started using ThreadedConnectionPool and switched to threads (with processes I keep getting psycopg2. get_connection(). By continuing to use Pastebin, you agree to our use of cookies as described in the Cookies Policy. El 1 de mayo de 2012 15:46, Juan Antonio escribió:. from pysimplesoap. OK, I Understand. I have tried to use a key, but it didn't work so I would appreciate it if someone could point me in the right direction. @Lance: idle in transaction connections are one of the worst things you can have. How to reuse database connection in Flask If you want to do it yourself though this is exactly the problem that psycopg2. Is is described in README in more details. Databases are essential to most applications, however most database interaction is often overlooked by Python developers who use higher level libraries like Django or SQLAlchemy. To create and configure the queue table, call the create. from pysimplesoap. Database helpers. py仔细阅读一番,就会发现其实逻辑很简单。 class ThreadedConnectionPool(AbstractConnectionPool): """A connection pool that works with the threading module. SimpleConnectionPoolを利用してみます。. PoolError: trying to put unkeyed connection The strange thing is though that the psycopg2 documentation says that keying a connection is optional so I'm not sure why one is required for the code below. Connection pooling is implemented by thinly wrapping a psycopg2 connection object with a pool-aware class. import threading. $ pip install psycopg2-binary The binary package is a practical choice for development and testing but in production it is advised to use the package built from sources. class psycopg2. pool import ThreadedConnectionPool #ESB Call from suds import WebFault from suds. 有人可以解释一下如何在当前数据库中获取表?我正在使用postgresql-8. Psycopg2’s ThreadedConnectionPool It is also a subclass of the AbstractConnectionPool class and implements methods defined in it. pool – Connections pooling. This class used in the multithread application where a pool that assigns persistent connections to different threads. Project description. App Engine は Cloud SQL インスタンスへのコネクタをサポートしています。次の例では、パッケージ PyMySQL を SQLAlchemy(MySQL の場合)と psycopg2(PostgresSQL の場合)で使用します。. Multithreaded application for Tornado The documentation for a non-blocking web server Tornado beautifully described as it copes with a great load, and generally it is the crown of mankind creation in the field of non-blocking servers. ) 2009-01-20 Federico Di Gregorio * Fixed problem reported by Lawrence Oluyede where register_type() didn't work on connection and cursors suclasses. GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. 72k posts, ranked #3448. python psycopg2 连接pg 建立连接池 utf-8 -*-from psycopg2. class psycopg2. pool – Connections pooling. The cursor object uses the psycopg2 'DictCursor' by default (which returns rows as a pseudo python dictionary) however this can be overridden by providing a 'cursor_factory' parameter to the constructor. Other interesting features of the adapter are that if you are using the PostgreSQL array data type, Psycopg will automatically convert a result using that data type to a Python list. Je suppose que vous savez gevent-psycopg2 module, ce qui rend psycopg greenlet de l'environnement. client import Client. Here is an interactive session showing some of the basic commands:. Creating new PostgreSQL connections can be an expensive operation. context_managers import CursorContextManager from postgres. multiprocessing is a package that supports spawning processes using an API similar to the threading module. PersistentConnectionPool(minconn, maxconn, *args, ** kwargs) A pool that assigns persistent connections to different. Para las conexiones a la base de datos voy a usar PostgreSQL con psycopg2. pool - Connections pooling¶. org F-Secure Corporation PostgreSQL Conference East 2011 CC-BY. pool from huey_pg import PostgresHuey pool = psycopg2. 问题:有时,在并发请求期间,过程调用结果混淆,代码正在查询procedure_1但是正在获取procedure_2的结果(反之亦然,另一个并发客户端). 问题:有时,在并发请求期间,过程调用结果混淆,代码正在查询procedure_1但是正在获取procedure_2的结果(反之亦然,另一个并发客户端). from psycopg2 import connect from pq import PQ conn = connect(' dbname=example user=postgres ') pq = PQ(conn) 对于多线程操作,使用连接池,例如 psycopg2. A connection pool that works with the threading module. Creating new PostgreSQL connections can be an expensive operation. 鑑於安全性的理由,您不應使用標準 TCP 通訊端將 App Engine 應用程式連線至 Cloud SQL 執行個體。App Engine 支援透過連接器連接 Cloud SQL 執行個體。以下範例針對 SQLAlchemy (適用於 MySQL) 與 psycopg2 (適用於 PostgresSQL) 使用 PyMySQL 套件:. After that working, "from psycopg2. py仔细阅读一番,就会发现其实逻辑很简单。 class ThreadedConnectionPool(AbstractConnectionPool): """A connection pool that works with the threading module. context_managers import CursorContextManager from postgres. ThreadedConnectionPool(minconn, maxconn, *args, **kwargs) A connection pool that works with the threading module. Psycopg2’s ThreadedConnectionPool It is also a subclass of the AbstractConnectionPool class and implements methods defined in it. connection_poo. 有人可以解释一下如何在当前数据库中获取表?我正在使用postgresql-8. When gunicorn forks new process they will copy these connections. Following the instructions to create the database was fine but I ran into similar problems as reported above. Para melhor organizar o código, criei uma classe com os métodos. from pysimplesoap. By voting up you can indicate which examples are most useful and appropriate. Столкнулся с ошибкой, которую не могу уже некоторое время побороть. Programming with Python and PostgreSQL Peter Eisentraut [email protected] 标签: psycopg2. Other interesting features of the adapter are that if you are using the PostgreSQL array data type, Psycopg will automatically convert a result using that data type to a Python list. 0' # A Helper # ===== # Heroku gives us an URL, psycopg2 wants a DSN. Как я могу объединить соединения с помощью psycopg и gevent? В документах psycopg указано: «Соединения Psycopg не являются безопасными для зеленого потока и не могут использоваться одновременно разными зелеными потоками. threads can share the module and the connection. pool import ThreadedConnectionPool pool = ThreadedConnectionPool(5,100,"dbname=你的数据库名 user=用户名 password=密码 host=主机名 port=端口号") #创建连接池连接 conn= pool. This week, we'll use subdomains to identify the tenant. Creating new PostgreSQL connections can be an expensive operation. 为了搞清楚线程池实现的细节,方便理清其中的原理,然后打开psycopg2 的源代码中pool. from pysimplesoap. Well, I benchmarked my webapp without prepared statements, and then with. class psycopg2. which is incredibly detailed and looks as though I have misunderstood what multiprocessing. import threading. index; modules | Psycopg 2. # psycopg2 is free software: you can redistribute it and/or modify it # under the terms of the GNU Lesser General Public License as published # by the Free Software Foundation, either version 3 of the License, or. Because of this, several web server processes will clobber each other's connections to postgresql. Database helpers. You can vote up the examples you like or vote down the ones you don't like. Как я могу объединить соединения с помощью psycopg и gevent? В документах psycopg указано: «Соединения Psycopg не являются безопасными для зеленого потока и не могут использоваться одновременно разными зелеными потоками. OperationalError: server closed the connection unexpectedly, probably because of the way the fork is done), and everything works reliably again. OK, I Understand. Well, I benchmarked my webapp without prepared statements, and then with. But that's because pgBouncer has to have some connection in the pool. They are extracted from open source Python projects. org F-Secure Corporation PostgreSQL Conference East 2011 CC-BY. pool) threadsafety (in module psycopg2) TIME (in module psycopg2. By continuing to use Pastebin, you agree to our use of cookies as described in the Cookies Policy. this allows "import psycopg2" to work. cursors import SimpleTupleCursor, SimpleNamedTupleCursor from postgres. You can vote up the examples you like or vote down the exmaples you don't like. 我正在使用psycopg2. 7 64 bit, PythonXY with Spyder). Is is described in README in more details. Introduction¶. import settings. Creating new PostgreSQL connections can be an expensive operation. pool import ThreadedConnectionPool,SimpleConnectionPool,PersistentConnectionPool from constant.