Programmer Think

Technical contents involved: vue, SpringBoot, leaflet, Linux, MySQL Only a few big head technologies are listed, and other technologies such as html, js, mybatis.... I won't explain them one by one Main content of this issue: an example of environment construction and running through Required tools jdk, maven, idea, vsCode, MySQL, ...

For 3.2 Data query - SELECT (single table query, join query, nested query, set query, multi table query) Learning notes; 0. Preface This article is a note on the database query SELECT part edited by Mr. Wang Shan in introduction to database system, which adopts SQL Sever database.All examples in this article will have screenshots of the resul ...

1, Rsync data mirroring backup tool 1.1Rsync overview rsync is a data image backup tool under Linux system Using the fast incremental backup tool Remote Sync, you can synchronize remotely, support local replication, or synchronize with other SSH and rsync hosts Official website: https://rsync.samba.org/(https://rsync.samba.org/ ) 1.2R ...

I'm almost finished. I've sorted out some nodes JS + MySQL notes. fs module fs common methods const fs = require('fs') // read file // fs.readFile(path[, options], callback) // options: indicates the encoding format to read the file (optional). If not selected, it is output as a Buffer object // Callback: after reading the file, get the r ...

The original content of GreatSQL community cannot be used without authorization. Please contact Xiaobian and indicate the source for reprint.In order to experience GreatSQL for community users, we also provide Docker images. This article describes in detail how to deploy GreatSQL in Docker and build an MGR cluster.The operating environment invo ...

Filter data This chapter will teach you how to specify search criteria using the WHERE clause of a SELECT statement. Use WHERE clause Databases generally contain a large amount of data and rarely need to retrieve all rows in the table. Usually, only part of the table data will be extracted according to the requirements. To retrieve only the ...

Game Item Management System @email: lovefyj616@foxmail.com This management system can store the same kind of items, support the operation of selling, using, removing, purchasing, etc. In addition, it introduces the attributes of personal life value, manpower value, gold coin, attacking power to show the excellent data binding operation ...

Operating environment: Development tools: IDEA /Eclipse Database: mysql5 seven Application service: Tomcat7/Tomcat8 Using framework: Spring + spring MVC + mybatis Project introduction Nowadays, great changes have taken place in our computer-based lifestyle. The rapid development of the Internet makes everyone pay attention to the value of th ...

1. DataX template Method 1: DataX configuration file template python bin/datax.py -r mysqlreader -w hdfswriter Method 2: Official Documents https://github.com/alibaba/DataX/blob/master/README.md 2. Synchronize Mysql data to HDFS cases 2.1 TableMode of mysqlreader Use attributes such as table, column, and where to declare the data t ...

In work, we delete data or database by mistake. Do we have to run away? I don't think so. Programmers must learn to save themselves and retrieve the data unconsciously. In MySQL database, we know that binlog logs record all our operations on the database, so binlog logs are a sharp tool for us to save ourselves. Today, taking MySQL databa ...