Data x Data Synchronization: A Simple Practice of Mysql 2 Mysql (Local windows) (Containing Several Solutions to Compile Errors)

This paper uses datax in windows environment and refers to it in Linux environment. Development tools and environmental parameters: Windows environment: IDEA, JDK 1.8, Maven 3.6.0, Python 2.7.16 Linux environment: MySQL 5.7.25 (deployed on tw ...

Posted on Fri, 16 Aug 2019 02:37:50 -0700 by shivangp

Aviator expression evaluation engine

Application Scenarios Requirements: User portfolio system functions formulate formulas, code calls calculation. Solution: Originally intended to use java to write a compiler, but the work is more difficult. Search the web for other solutions, Aviat ...

Posted on Thu, 15 Aug 2019 20:20:59 -0700 by simoesp

Grasp the Use of @ModelAttribute from the Principle Level (Core Principles Chapter) [Learn Spring MVC Together]

Every sentence We should be a man with a blueprint in his chest and a plan in his feet. Preface The annotation-based programming model provided by Spring MVC greatly simplifies the development of web applications, and we are all beneficiaries. For example, we use @RequestMapping, @ExceptionHandler annotations on the @RestController annotated ...

Posted on Thu, 15 Aug 2019 08:45:56 -0700 by bizshop

Grasp the Use of @ModelAttribute from the Principle Level [Learn Spring MVC Together]

Every sentence Everyone should think clearly about this question: Are you a grandfather or a god? Preface Last article Describes the core principles of @ModelAttribute. This article focuses on the use of scenarios, demonstrates the use of @ModelAttribute in different scenarios, and points for attention (of course, some related principles will ...

Posted on Thu, 15 Aug 2019 08:41:39 -0700 by wizzkid

Inheritance-modifier

1. Inheritance 1.1 Implementation of Inheritance (Emphasis) The Concept of Inheritance Inheritance is one of the three characteristics of object-oriented. It can make subclasses have attributes and methods of parent class. It can also be redef ...

Posted on Thu, 15 Aug 2019 04:25:52 -0700 by NFD

Introduction to the First Experience of RPC Framework

Introduction to the First Experience of RPC Framework Project address: https://github.com/shirukai/learn-demo-rpc.git RPC is called Remote Procedure Call. As its name implies, remote procedure call means remote procedure call. For an introduction ...

Posted on Thu, 15 Aug 2019 03:09:04 -0700 by walexman

Spark Core Custom Sort, Partition

Custom Sorting (Important) Simple data types can be sorted directly in spark, but some complex conditions can be achieved by using custom sorting import org.apache.spark.rdd.RDD import org.apache.spark.{SparkConf, SparkContext} //Custom Sorting obj ...

Posted on Thu, 15 Aug 2019 00:19:09 -0700 by EddieFoyJr

Validation introduced by SpringMVC

Data validation on the client side is not safe and effective for any application, which requires us to validate the validity of data on the server side when developing.SpringMVC has its own good support for data validation on the server side. It can validate the validity of data we submit to the server side according to our prior conventions. F ...

Posted on Wed, 14 Aug 2019 23:53:57 -0700 by PHPGuru_2700

SpringCloud Micro Service (05):Zuul component for routing gateway control

1. Introduction to Zuul components 1. Basic concepts Zuul Gateway mainly provides dynamic routing, monitoring, resilience, security control and other functions.In a distributed micro-service system, the system is split into multiple micro-service modules, which route user requests through the zuul gateway and forward to specific post-micro-ser ...

Posted on Wed, 14 Aug 2019 21:48:25 -0700 by abx_2112

Snowflake snowflake algorithm

Summary SnowFlake is an algorithm designed by Twitter to generate unique IDs in distributed systems. It can satisfy tens of thousands of requests for message ID allocation per second by Twitter. These message IDs are unique and have approximatel ...

Posted on Wed, 14 Aug 2019 00:01:07 -0700 by Joshua4550