postgresql

校友录小程序开发随笔一:背景与技术方案的选择

╄→尐↘猪︶ㄣ 提交于 2020-12-14 01:12:17
一 业务背景介绍 小女子毕业于湖南长沙某985二梯队大学,在深圳某厂工作,鉴于本校在深圳校友众多(大概4w+), 急切需要一个校友交流的平台,传统的网站形式以及没落且无人问津,故打算开发 一个小程序+公众号的社交平台,供木讷的工科师兄师弟师姐师妹交流,初步计划的模块有资讯,交友,互助,捐赠,个人中心,代言母校,聚会活动,校友供需,后续会陆续来落实。 二 前端技术方案选型 原生 :对性能特别苛刻 or 追求稳定 or 要用最新功能,请记住任何时刻原生都是最稳定性能最好的选择!!!! KBone :kbone 是一个致力于微信小程序和 Web 端同构的解决方案,微信小程序的底层模型和 Web 端不同,我们想直接把 Web 端的代码挪到小程序环境内执行是不可能的。kbone 的诞生就是为了解决这个问题,它实现了一个适配器,在适配层里模拟出了浏览器环境,让 Web 端的代码可以不做什么改动便可运行在小程序里。 MPVue :是美团点评开源的一个使用 Vue.js 开发小程序的前端框架。框架基于 Vue.js 核心,mpvue 修改了 Vue.js 的 runtime 和 compiler 实现,使其可以运行在小程序环境中,从而为小程序开发引入了整套 Vue.js 开发体验。 WePY :腾讯团队开源的一款类vue语法规范的小程序框架,借鉴了Vue的语法风格和功能特性,支持了Vue的诸多特征

03-Debezium的载体Kafka Connect

三世轮回 提交于 2020-12-13 10:52:50
什么是Kafka Connect 正如前面的文章所说,Debezium提供的各种Connector都是Kafka Connect的插件,运行于Kafka Connect的服务上。 首先我们要知道,Kafka的特性,例如,topic的分区、I/O结合操作系统的页缓存(page cache)等,这些令Kafka具备了高吞吐量、低延时及高可用等优点。 由于Kafka的优点,当需要实现 CDC(Changed Data Capture) 时,即捕获 数据源 的变动并同步至 目标数据源 ,我们可以使用Kafka作为 数据源 和 目标数据源 之间的数据通道。 而作为开发人员只想专注于开发与数据源交互的代码,至于怎样开发Producer程序把捕获的数据发布到Kafka、怎样保证捕获数据的服务高可用,他们不希望多花精力考虑。这时,可以使用Kafka Connect把上下游的数据源与Kafka串联起来,而与数据源交互的业务代码则以Connector的形式运行在Kafka Connect上。 如上图所示,从 捕获数据源变动情况 的Connector被称为 Source Connector ,它们负责与数据源交互,把捕获到的记录放到一个集合里面(不一定是queue),然后,Kafka Connect会调用 Connector 对应的 Task 的 poll 方法从集合中获取记录,并发送至Kafka。

Postgresql remote access no pg_hba.conf entry for host

放肆的年华 提交于 2020-12-13 04:46:04
问题 I'm trying to get remote access to postgresql, installed on a server with IP A.A.A.A. There are two servers which one them has IP A.A.A.A, where postgresql has been installed on; and the other one has IP B.B.B.B. I've edited /etc/postgresql/10/main/pg_hba.conf and added the following lines host my_db db_user B.B.B.B/32 md5 host my_db db_user A.A.A.A/32 md5 I've also edited /etc/postgresql/10/main/postgresql.conf and set listen_addresses to '*' , like this: #-----------------------------------

could not connect to postgresql server django lightsail

て烟熏妆下的殇ゞ 提交于 2020-12-13 04:43:46
问题 I keep running into the problem of not being able to connect to the database: django.db.utils.OperationalError: could not connect to server: No such file or directory Is the server running locally and accepting connections on Unix domain socket "/opt/bitnami/postgresql/.s.PGSQL.5432/.s.PGSQL.5432"? its my list of databases: List of databases Name | Owner | Encoding | Collate | Ctype | Access privileges ------------+----------+----------+-------------+-------------+-----------------------

postgres: uncommitted xmin from before xid cutoff needs to be frozen

邮差的信 提交于 2020-12-13 03:46:36
问题 PostgreSQL 9.6. The server have recently recovered from a sudden power off. When run select command in pgadmin for table Current , it shows invalid page in block 6455316 of relation base/16384/31656 . Then we tried to solve the problem using vacum full "Current" . But it shows ERROR: uncommitted xmin 491792044 from before xid cutoff 492223244 needs to be frozen . If reindex the table directly, it shows: WARNING: invalid page in block 6455316 of relation base/16384/31656; zeroing out page

Django and PostgreSQL sequence for primary key autoincrement

别说谁变了你拦得住时间么 提交于 2020-12-13 03:46:29
问题 I have the following table and sequence in my postgresql-8.4 database: CREATE TABLE complexobjectpy ( id integer NOT NULL, the_geom geometry, semcat integer, CONSTRAINT complexobjectpy_pkey PRIMARY KEY (id), CONSTRAINT enforce_dims_the_geom CHECK (st_ndims(the_geom) = 2), CONSTRAINT enforce_srid_the_geom CHECK (st_srid(the_geom) = 900913) ) WITH ( OIDS=FALSE ); ALTER TABLE complexobjectpy OWNER TO tss; CREATE SEQUENCE seq_complexobjectpy INCREMENT 1 MINVALUE 1 MAXVALUE 9223372036854775807

postgres: uncommitted xmin from before xid cutoff needs to be frozen

坚强是说给别人听的谎言 提交于 2020-12-13 03:44:45
问题 PostgreSQL 9.6. The server have recently recovered from a sudden power off. When run select command in pgadmin for table Current , it shows invalid page in block 6455316 of relation base/16384/31656 . Then we tried to solve the problem using vacum full "Current" . But it shows ERROR: uncommitted xmin 491792044 from before xid cutoff 492223244 needs to be frozen . If reindex the table directly, it shows: WARNING: invalid page in block 6455316 of relation base/16384/31656; zeroing out page

Merge multiple rows into one with more than one row value in a column

亡梦爱人 提交于 2020-12-13 03:27:37
问题 I'm currently building a query to retrieve some data from my db, I need to access some information with a common id in just one row. With this query: select missions_answer.response_id as "response", crm_player."document" as "document", missions_question.label as "label", missions_answertext.body as "bill #", missions_answerselectmultiple.body as "product", missions_answerinteger.body as "answer" from missions_answer left join missions_question on missions_answer.question_id = missions

Merge multiple rows into one with more than one row value in a column

此生再无相见时 提交于 2020-12-13 03:27:35
问题 I'm currently building a query to retrieve some data from my db, I need to access some information with a common id in just one row. With this query: select missions_answer.response_id as "response", crm_player."document" as "document", missions_question.label as "label", missions_answertext.body as "bill #", missions_answerselectmultiple.body as "product", missions_answerinteger.body as "answer" from missions_answer left join missions_question on missions_answer.question_id = missions

chown: /var/lib/postgresql/data/postgresql.conf: Read-only file system

末鹿安然 提交于 2020-12-13 03:17:46
问题 I solved a permission issue when mounting /var/lib/postgresql/data by following this answer with initContainers . Now I'm trying to mount postgresql.conf as a volume, and I'm running into a similar permissioning issue that throws chown: /var/lib/postgresql/data/postgresql.conf: Read-only file system . What could I be missing? I've tried a bunch of different variations with little luck. apiVersion: apps/v1beta1 kind: StatefulSet metadata: name: postgres labels: app: postgres spec: serviceName: