postgresql

How to store a store opening hours in an SQL database?

由 戏子无情 提交于 2020-12-08 05:11:58
问题 I am developing an app for stores (in fact, restaurants) and need to design the PostgreSQL data structure for it. For instance, the restaurant might have opening hours Mon-Fri from 7:30 to 17:00 and from 20:30 to 1:00 the following day. The data to be stored for each weekday would be something like ['Monday', true, 450, 1050, 1230, 1500 ] , being true === "it does open on Mondays", 450, opening time is 450 minutes past midnight (see here), i.e. at 7:30h, closes at 17:30h, reopens at 20:30h,

开源软件联盟PostgreSQL分会投稿指南

由 纵然是瞬间 提交于 2020-12-07 20:09:27
投稿要求 稿件内容： 与PostgreSQL数据库/开源软件紧密相关的新闻舆论、热点资讯、技术文章、软文等文章。要求稿件论点中立，论述详实，能够对读者粘性提高有积极作用。文章体裁不限，字数不限。 投稿格式： 文字投稿建议采用word格式。 视频投稿建议采用MP4格式，分辨率：1080X1920 注意事项： 来稿请注明作者署名（真实姓名、笔名）、详情地址、邮编、联系电话、E-mail地址等，以便联系。其次，作者可提供作者简介，以便宣传推广。最后，我们保留对稿件的增删权。 投稿方式 请使用电子邮件方式投递稿件。 2. 编译的稿件，请注明出处并附带原文。 3. 请按稿件内容投递到相关编辑信箱（sunxiangbin@postgresqlchina.com），或：partner@postgresqlchina.com 稿件著作权 投稿人保证向我方所投之稿件，尚未在任何媒体上发表。 投稿人向我方所投之作品不得同时向第三方投送，即不允许一稿多投。 投稿人委托我方声明，未经我方允许，任何网站、媒体、组织不得转载、摘编其作品。 稿费结算 原创稿件的稿酬标准为30—100元人民币/千字，翻译稿件的稿酬标准为20—50元人民币/千字。特稿特酬，优稿优酬。 我们采用线上汇款的方式支付稿费，请在稿件中注明真实姓名（或者笔名），邮箱地址，微信账号/支付宝账号，出稿成功我们将会有工作人员与你取得联系。汇款方式

Sequelize how to structure the chat part of the app?

由 六月ゝ 毕业季﹏ 提交于 2020-12-07 16:41:02
问题 I currently have an app where users can log in and make posts. Next to each post, there is button that if pressed, the current user can send a message to the user who created the post. I have a posts model and a user model. Each user can post as many posts as they want, but each post only belongs to one user. const User = db.define( "User", { id: { type: Sequelize.INTEGER, primaryKey: true, autoIncrement: true, }, name: { type: Sequelize.STRING, }, email: { type: Sequelize.STRING, }, password

Sequelize how to structure the chat part of the app?

由 流过昼夜 提交于 2020-12-07 16:39:09
问题 I currently have an app where users can log in and make posts. Next to each post, there is button that if pressed, the current user can send a message to the user who created the post. I have a posts model and a user model. Each user can post as many posts as they want, but each post only belongs to one user. const User = db.define( "User", { id: { type: Sequelize.INTEGER, primaryKey: true, autoIncrement: true, }, name: { type: Sequelize.STRING, }, email: { type: Sequelize.STRING, }, password

Trying to use “\i [filename]” in psql, getting “invalid argument”

由 落花浮王杯 提交于 2020-12-07 08:33:07
问题 Using Windows 10, Postgres 11. I have a file C:\Users\myname\some path\query.sql containing a typical SELECT query: select a.id,m.toagentid,m.maxstart from agent a left join mostrecentfromtopair m on a.id=m.fromagentid When I'm in the psql terminal, and I try to run this query as follows: \i "C:\Users\myname\some path\query.sql" then I get this error: \i: Invalid argument How should I be running this .SQL file? 回答1: You can use single quotes and slashes: \i 'C:/Users/myname/some path/query

python-django框架

由 我与影子孤独终老i 提交于 2020-12-07 03:50:23
django 概述 python有许多不同的WEB框架，django是最具有代表性的一位，许多成功的网站和APP都基于django django是一个开源的web应用框架，由python编写 django采用了MVC的软件设计模式，既模型M，视图V，和控制器C MVC框架和MTV框架 MVC （Model View Controller）是软件工程中的一种软件架构模式；把软件分为了三个基本部分：模型（Model） 视图（View）和 控制器（controller）具有耦合度低，重用性高，生命周期成本低等优点。 Django框架的设计模式借鉴了MVC框架的思想，也是分成三部分，来降低各个部分之间的耦合性。 Django框架的不同之处在于它拆分的三部分为：Model（模型）、Template（模板）和View（视图），也就是MTV框架。 Django的MTV模式 Model(模型)：负责业务对象与数据库的对象(ORM) Template(模版)：负责如何把页面展示给用户 View(视图)：负责业务逻辑，并在适当的时候调用Model和Template 此外，Django还有一个urls分发器，它的作用是将一个个URL的页面请求分发给不同的view处理，view再调用相应的Model和Template Django框架图示 前端状态码的返回 1xx 请求接受了需进一步处理 2xx 成功

JOIN Multiple Table based on timestamp and another condition

由 佐手、 提交于 2020-12-07 00:30:50
问题 I want to join 3 tables which Table A have date and time in different field that need to be combined first so it can be compared on Table B using field timestamp. Table A userid | date_in | check_in --------+------------+---------- 145 | 2017-01-23 | 08:56:05 254 | 2017-01-24 | 08:56:54 202 | 2017-01-25 | 08:53:26 15 | 2017-01-26 | 08:47:40 Table B userid | checktime | sn --------+---------------------+--------------- 145 | 2017-01-23 08:56:05 | 0345135200184 254 | 2017-01-24 08:56:54 |

JOIN Multiple Table based on timestamp and another condition

由 冷暖自知 提交于 2020-12-07 00:30:37
问题 I want to join 3 tables which Table A have date and time in different field that need to be combined first so it can be compared on Table B using field timestamp. Table A userid | date_in | check_in --------+------------+---------- 145 | 2017-01-23 | 08:56:05 254 | 2017-01-24 | 08:56:54 202 | 2017-01-25 | 08:53:26 15 | 2017-01-26 | 08:47:40 Table B userid | checktime | sn --------+---------------------+--------------- 145 | 2017-01-23 08:56:05 | 0345135200184 254 | 2017-01-24 08:56:54 |

Entity Framework Core postgresql Array Type Mapping not working

由 夙愿已清 提交于 2020-12-06 12:37:48
问题 I have a strange problem, maybe it is something that I'm missing out, but I have the following LINQ Lambda query: var ss = ctx.ShipZones.SelectMany( z => ctx.ShipDecks, (z, d) => new { Zone = z.ZIndex, Deck = d.DIndex, Value = ctx.Tags .AsExpandable() .Include(s => s.TagSettings.Device.System) .Where(s => s.TagSettings.TagTypeId == 171 && s.TagSettings.Device.System.Id == z.Id && s.TagSettings.Device.ControlArea.Contains(d.Id) ) .Average(s => s.Value) } ).ToList(); According to this article,

postgresql 高可用 etcd + patroni 之三 switchover

由 心已入冬 提交于 2020-12-06 05:34:33
os: centos 7.4 postgresql: 9.6.9 etcd: 3.2.18 patroni: 1.4.4 patroni + etcd 是在一个postgrsql 开源大会上 亚信的一个哥们讲解的高可用方案。 依然是基于 postgreql stream replication。 ip规划 192.168.56.101 node1 master 192.168.56.102 node2 slave 192.168.56.103 node3 slave 手动 switchover 切换前的状态 $ patronictl -c /usr/patroni/conf/patroni_postgresql.yml list pg96 +---------+----------+----------------+--------+---------+-----------+ | Cluster | Member | Host | Role | State | Lag in MB | +---------+----------+----------------+--------+---------+-----------+ | pg96 | pg96_101 | 192.168.56.101 | | running | 0.0 | | pg96 | pg96_102 | 192
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