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Hello, I'm miniluo. For positions requiring distributed experience, interviewers always like to ask questions about distributed locks. Recently, I have the honor to participate in the company's interview, and I often ask about the knowledge of distributed locks. Most of the candidates' answers are more limited to using, and they have not though ...

01 Focusing on your "Ape Story" friends, you know that previous articles have advocated rejection of CRUD. What is CRUD?Today let's talk about how the Java sisters and apes interact with the old database man.   Product Xiao Wang Tiao said forcefully: Ape classmates, let's launch a pop-up product in the near future, you first achieve ...

Working environment, Alipay account is company, app application and secret key configuration are my own application, and the process is temporarily skipped. 1, Preparations appid, application private key, application public key, Alipay public key 2, Profile 'alipay'=>[ 'appId' => '20180300000000', 'gatewayU ...

mongoDB Replica Set Actual Warfare background Features of a mongoDB single server: - Risk of data loss - Single server cannot be highly available Features of the mongoDB replica set: -High Availability Architecture to Prevent Data Loss - Keep multiple replicas synchronized and consistent - The mongodb replica set switches automatically when ...

Business description: table A is the detailed statement of table B. now it is required that table B has millions of records. Insert the relevant records of table B in table A. Preparation: oracle database, database tool pl\sql, stored procedures written in the package. Implementation ideas: 3.1 get the total data volu ...

Citation dependency <!--seata--> <dependency> <groupId>com.alibaba.cloud</groupId> <artifactId>spring-cloud-starter-alibaba-seata</artifactId> <exclusions> <exclusion> <artifactId>seata-all</artifactId> <groupId>io.seata</groupId> &lt ...

Preface In the previous article, I briefly introduced Linq's entry-level usage. This article tries to explain some more in-depth usage methods. Unlike the previous article, I will first introduce the support methods in Linq, and then write them in the form of method chain and SQL like, guided by the actual requirements. Introduction to pre conc ...

/*   *Copyright (c)2017, School of computer and control engineering, Yantai University *All rights reservrd.            *Author: Li Xinhao *Completion time: December 14, 2017 *Version number: v1.0 *Problem Description: suppose three kinds of parentheses are allowed in an expression: parentheses, square brackets, and brac ...

The renderings are as follows: Click event is attached to the secondary list.   1. Layout file: A custom navigation RelativeLayout is added here. Remember to add "Android: theme" = "@ style / theme. Appcompat. Light. Noactionbar" When noting activity to remove the navigation. 1 <?xml version="1.0" encoding="utf-8"?> ...

Database operation: Create database: CREATE DATABASE database name; View database: # View all databases SHOW DATABASES; Create database: #Select a database / switch to xxx database USE database name; Create database: #Delete database DROP DATABASE database name; Table operation: Create table: # Multiple param ...