Nodejs Road-MongoDB&MySQL

MongoDB 1.1 Overview MongoDB is a database based on distributed file storage. Written in C++ language. The aim is to provide a scalable and high performance data storage solution for WEB applications. MongoDB is a product between relational database and non-relational database, which has the most abundant functions and resembles relational ...

Posted on Mon, 22 Jul 2019 05:51:24 -0700 by bznutz

Centos installs Confluence with docker

1. Download the official image docker pull atlassian/confluence-server:6.15.7-alpine 2. Create and run containers docker run -m 1024M --memory-swap -1 -host --net=host --name wiki -d -p 8090:8090 -p 8000:8000 atlassian/confluence-server:6.15.7-alpine 3. Enter Initialization Interface Access address: http://Server IP:8090/setup/setupstart. ...

Posted on Mon, 22 Jul 2019 03:35:36 -0700 by HavokDelta6

Excel Catalyst Open Source Wave 50 - Interconnection between Excel and PowerBIDeskTop Part 4

The last part of PowerBI function sharing is about how to export metadata of data model. The author defines it as data dictionary of model. The corresponding function of this article comes from: Wave 6 - Derived Powerbi Desktop Model Data Dictionary https://www.jianshu.com/p/bc26a8dcdfce Relational databases have data dictionaries, analytical d ...

Posted on Sun, 21 Jul 2019 21:55:33 -0700 by mrphobos

Oracle Learning Notes 4: pl/sql

1. What is pl/sql? sql: Structured Query Language pl/sql: (Procedure Language & Structured Query Language) is an extension of SQL language and stored procedure language. It can implement simple logic programming like Java language. 2. Advantages of pl/sql? From bloggers https://www.cnblogs.com/huyong/archive/2011/05/16/2047329.html See ...

Posted on Sun, 21 Jul 2019 20:41:56 -0700 by EGNJohn

Singleton pattern - the simplest design pattern?

First, in the front In the system development and design, there are always several situations, such as: (1) creating destroyed objects frequently; (2) creating objects consumes a lot of resources, but often uses objects (such as tool class objects, frequently accessing database or file objects, data sources, session factories, etc.); and (3) on ...

Posted on Sun, 21 Jul 2019 06:53:39 -0700 by msielski

[Knowledge Base]-Advanced Data Query of Database_MySQL: Reduplication, Combination Query, Connection Query, Virtual Table

Brief Book Author: seay Origin of the article: Advanced Data Query of Relational Database SQL: Reduplication, Composite Query, Connection Query, Virtual Table Recalling: [Knowledge Base]-Basic Data Query of Database_MySQL: Subquery, Group Query, Fuzzy Query   Learn [has been tested and verified] 1. Deduplication (DISTINCT) Composite queri ...

Posted on Sun, 21 Jul 2019 00:54:37 -0700 by Chris_Evans

Day61 (Routing System, Function View, Django ORM Preliminary)

1.1 Pseudo-static Pseudo-static is relative to static files, such as https://www.cnblogs.com/hesujian/p/11165818.html We call it pseudo-static, because it's not actually html static pages, it's just masquerading as html static pages. The benefits of pseudo-static: 1. Beautiful (the traditional question mark splicing looks messy) 2. Seo (Se ...

Posted on Sun, 21 Jul 2019 00:48:36 -0700 by dahwan

Operating MySql in python

Operating MySql in Python Articles Catalogue Operating MySql in Python Create database tables ** Database insertion operation** ** Database query operation** ** Database Update Operation** ** Database deletion operation** Create database tables In Python programs, execute() can be used to cr ...

Posted on Sat, 20 Jul 2019 23:27:09 -0700 by surfinglight

Problems and Solutions of redis Distributed Locks

Problems and Solutions of redis Distributed LocksDistributed LockIn distributed environment, in order to ensure normal access to business data and prevent duplicate requests, distributed locks are used to block subsequent requests. Let's start with a piece of problematic business code: Copy code public void doSomething(String userId){ User ...

Posted on Sat, 20 Jul 2019 21:37:59 -0700 by freeak08

Mongodb Performance Pressure Measurement

Background In recent days, we have done a thorough benchmark stress test on all the basic components. At present, all of our open source basic components have not been tested for performance. Often, some developers ask how much our RDS and MongoDB cluster can resist. At this time, I can't reply, because I don't know, although one of them can r ...

Posted on Sat, 20 Jul 2019 08:26:14 -0700 by phpn00bf4life