listen

postgresql notify not return anything when insert or update

由 佐手、 提交于 2019-12-12 01:29:46
问题 i'm newbie for postgresql, now i try to get notification from db when that table (my table name is foo2) have insert or update but not have anything return from db to my code with c# project This is my code // -------------- create table --------------- CREATE TABLE foo2 (id serial primary key, name varchar); // -------------- create function ------------ CREATE OR REPLACE FUNCTION nf() RETURNS TRIGGER AS $$ BEGIN PERFORM pg_notify('notifytest', format('INSERT %s %s', NEW.id, NEW.name));

What happens with a NOTIFY when no session has issued LISTEN in PostgreSQL?

由 久未见 提交于 2019-12-11 11:40:15
问题 PostgreSQL has a good listen/notify system. Documentation says: There is a queue that holds notifications that have been sent but not yet processed by all listening sessions. If this queue becomes full, transactions calling NOTIFY will fail at commit. But I can't find out what happening with events in a specified channel that doesn't have listeners. Will notification queue overflow or will PG drop these events from queue? 回答1: It could be more clear in the manual, but there is definitive

Python: Listen on two ports

由 ∥☆過路亽．° 提交于 2019-12-09 18:25:40
问题 import socket backlog = 1 #Number of queues sk_1 = socket.socket(socket.AF_INET, socket.SOCK_STREAM) sk_2 = socket.socket(socket.AF_INET, socket.SOCK_STREAM) local = {"port":1433} internet = {"port":9999} sk_1.bind (('', internet["port"])) sk_1.listen(backlog) sk_2.bind (('', local["port"])) sk_2.listen(backlog) Basically, I have this code. I am trying to listen on two ports: 1433 and 9999. But, this doesn't seems to work. How can I listen on two ports, within the same python script?? 回答1:

idea整合docker

由 ⅰ亾dé卋堺 提交于 2019-12-08 23:44:39
1.开启docker远程访问 [root@izwz9eftauv7x69f5jvi96z docker]# vim /usr/lib/systemd/system/docker.service #修改ExecStart这行 ExecStart=/usr/bin/dockerd -H tcp://0.0.0.0:2375 -H unix:///var/run/docker.sock #重新加载配置文件 [root@izwz9eftauv7x69f5jvi96z docker]# systemctl daemon-reload #重启服务 [root@izwz9eftauv7x69f5jvi96z docker]# systemctl restart docker.service #查看端口是否开启 [root@izwz9eftauv7x69f5jvi96z docker]# netstat -nlpt #直接curl看是否生效 [root@izwz9eftauv7x69f5jvi96z docker]# curl http://127.0.0.1:2375/info 如下图则表示正确 [root@localhost ~]# vim /usr/lib/systemd/system/docker.service [root@localhost ~]# systemctl daemon

cerebro的安装

由 可紊 提交于 2019-12-08 20:05:30
参考文章： ElasticSearch基础介绍：5:可视化工具之cerebro https://blog.csdn.net/liumiaocn/article/details/98517815 [root@LogServer bin]# docker run --name cerebro -d -p 9100:9000 lmenezes/cerebro:0.8.4 Unable to find image 'lmenezes/cerebro:0.8.4' locally Trying to pull repository docker.io/lmenezes/cerebro ... 0.8.4: Pulling from docker.io/lmenezes/cerebro Digest: sha256:6c3662f04634fc7ecd5c73cc6854e5f53649616b5bd1c2dfb40387226c372e8c Status: Downloaded newer image for docker.io/lmenezes/cerebro:0.8.4 08216893b816cc4efcded4077b26de45c69c264564e6cd4d8c62e4aa39fcce29 先检查Elasticsearch运行状态 1 [root@LogServer bin]#

How to create a UDP server in C?

由 丶灬走出姿态 提交于 2019-12-08 15:41:05
问题 I'm trying to write a UDP server in C (under Linux). I know that in the socket() function I must use SOCK_DGRAM and not SOCK_STREAM . if ( (list_s = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0 ) { fprintf(stderr, "ERROR"); } But now, when I try to run the program (no errors in compiling), it says that there is an error in listen() . Here is the call to it: if (listen(list_s, 5) < 0) { fprintf(stderr, "ERROR IN LISTEN"); exit(EXIT_FAILURE); } Can you figure out what the problem is? This is

Listen gem not forwarding events to guard

由 孤街醉人 提交于 2019-12-06 15:48:53
I can't get Guard to run any action. I'm using: Gentoo x64 ( 3.14.14 ) rbx-2.5.2 guard 2.11.1 listen 2.8.5 Guardfile is just catch-it-all from Understanding guard guard :rspec, cmd: "bundle exec rspec" do watch(/(.*)/) { |m| Guard::UI.puts "Unknown file: #{m[1]}"; nil } end And here is the output of $ LISTEN_GEM_DEBUGGING=2 bundle exec guard -d I, [2015-02-04T08:11:34.995518 #25370] INFO -- : Celluloid loglevel set to: 0 I, [2015-02-04T08:11:34.997566 #25370] INFO -- : Listen version: 2.8.5 08:11:35 - DEBUG - Notiffany: gntp not available (Please add "gem 'ruby_gntp'" to your Gemfile and run

Node.js listen to MongoDB change

由 感情迁移 提交于 2019-12-05 00:08:28
问题 Is there a way for Node.js to listen to a change in a particular data in a collection of MongoDB, and fire an event if a change happens? 回答1: I believe you are looking for a database trigger. Unfortunately, MongoDB has no support for them yet, so I don't think you can listen for changes directly from the database. You'll need to setup some sort of notification system (e.g. pub/sub) that alerts interested parties when a collection has changed. 回答2: Well, this is an old question, but I was

1

由 天大地大妈咪最大 提交于 2019-12-04 14:11:21
[root@node9 ~]# ss -ntl State Recv-Q Send-Q Local Address:Port Peer Address:Port LISTEN 0 100 127.0.0.1:25 : LISTEN 0 128 :111 : LISTEN 0 128 :80 : LISTEN 0 128 :22 : LISTEN 0 100 [::1]:25 [::]: LISTEN 0 128 [::]:111 [::]:* LISTEN 0 128 [::]:22 [::]:* 来源： https://www.cnblogs.com/yinx1n/p/11869759.html

Python: Listen on two ports

由 ぐ巨炮叔叔 提交于 2019-12-04 07:31:43
import socket backlog = 1 #Number of queues sk_1 = socket.socket(socket.AF_INET, socket.SOCK_STREAM) sk_2 = socket.socket(socket.AF_INET, socket.SOCK_STREAM) local = {"port":1433} internet = {"port":9999} sk_1.bind (('', internet["port"])) sk_1.listen(backlog) sk_2.bind (('', local["port"])) sk_2.listen(backlog) Basically, I have this code. I am trying to listen on two ports: 1433 and 9999. But, this doesn't seems to work. How can I listen on two ports, within the same python script?? The fancy-pants way to do this if you want to use Python std-lib would be to use SocketServer with the
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