R uses quantstrat packages to obtain data on stocks, bonds, funds, gold, crude oil, indices, foreign exchange, and the global economy

The R language makes it very easy to obtain economic data from securities (stocks, bonds, funds, futures (gold, crude oil, etc.), indices, foreign exchange, and the Federal Reserve.Let me elaborate. The quantstrat package has complete financial data yahoo provides a wide range of securities data, including stocks, bonds, funds, futures, option ...

Posted on Mon, 24 Feb 2020 12:04:36 -0500 by Jamz

New features interpretation | MySQL 8.0 new features - replica set

Author: Yang Taotao Introduction Previously, I introduced a "MySQL Innodb Cluster literacy chapter". MySQL Innodb Cluster = MySQL Shell + MySQL Router + MySQL Group Replication(MGR) MySQL Shell manages the aggregation suite of MGR operations. After MySQL 8.0.19 is released, this combination extends to MySQL Replication (master-slave ...

Posted on Mon, 24 Feb 2020 05:27:19 -0500 by apsomum

WHERE clause - filter data

Chapter 6 filtering data Article directory Chapter 6 filtering data 1. Use WHERE clause 2. WHERE clause operator 2.1 check single value 2.2. Mismatch check 2.3 range value inspection 2.4. Null value check 3, summary Simple record - MySQL must know must know - [English] Ben Forta Learn how to u ...

Posted on Sun, 23 Feb 2020 02:38:23 -0500 by fahhem

CTFHub Boolean blind note

CTFHub Boolean blind note The topic has been shown to be Boolean blind. It is found that it is not closed, but also filtered. It is also a basic problem, but it is found that the echo is not right: payload:?id=1 and 's'='p'Echo is query < success This problem is different from the common Boolean bl ...

Posted on Sat, 22 Feb 2020 22:57:42 -0500 by Toxinhead

MHA of MySQL high availability cluster

1, MHA introduction At present, MHA (Master High Availability) is a relatively mature solution in the aspect of MySQL high availability. It is developed by yoshimaton (now working for Facebook), a Japanese DeNA company. It is an excellent high availability software for failover and master-slave improvement in MySQL high availability environm ...

Posted on Sat, 22 Feb 2020 12:24:43 -0500 by dahwan

Redis5.x two persistence methods and master-slave replication configuration

Pay attention to the official account number: CoderBuff, reply to "redis" and get the complete version of Redis5.x tutorial PDF. Redis5.x tutorial directory Chapter I preparation Chapter II data types Chapter III orders Chapter IV configuration Chapter 5 Java client (I) Chapter VI affairs Chapter 7 distributed lock Chapter 8 Java cli ...

Posted on Sat, 22 Feb 2020 10:21:27 -0500 by illushinz

Two layer load balancing architecture based on Keepalived -- configure the second layer server as lnmp environment

Article directory I. Preface Experimental thought Experimental environment 2, Configure the second tier server as lnmp environment Test lnmp environment I. Preface Experimental thought In the previous article, two active and standby mode hosts are deployed to form the first layer of load bal ...

Posted on Sat, 22 Feb 2020 07:53:54 -0500 by .-INSANE-.

[Emlog optimization] cache file optimization speed up article publishing speed up cache speed

Today, the webmaster of preferred resources continues to share the optimization of the Emlog website. How to speed up the caching speed of the website and the publishing speed of the articles? The previous article talked about a very rough method, which is simple and effective, but this is not in lin ...

Posted on Sat, 22 Feb 2020 00:22:31 -0500 by accident

A simple addition, deletion, modification and query of sprigboot+jpa

Recently, I have taught myself some basic usage of springboot on mooc.com, and I have learned some relevant knowledge on the way to use it. Next, I will write down my learning achievements: This record is a simple addition, deletion, modification and query of mysql database using springboot+jpa. After a ...

Posted on Fri, 21 Feb 2020 05:03:10 -0500 by kyllerj

Microservice provider

After we have created the total project of a project, we need to write an api sub module, which is generally called an entity class. We need entity class data to call this sub module. First, we import a lombok in pom: <dependencies> <dependency> <groupId>org.proje ...

Posted on Fri, 21 Feb 2020 01:38:30 -0500 by bigbstanley