Programmer Think

catalogue 1, System introduction 1. Development environment 2. Technical selection 3. System functions 4. Database files 5. System screenshot 2, System display 1. Log in to the system 2. System home page 3. New pets​ 4. Modify pets 3, Partial code AdminDaoImpl PetDaoImpl pet-add.jsp pet-add-do.jsp pet-update.jsp pet-update-d ...

1, Jenkins+Docker+SpringCloud continuous integration process Text flow Developers submit their code to the Gitlab code warehouse every day. Jenkins pulls the project source code from Gitlab, compiles it and makes it into a jar package, then builds it into a Docker image, and uploads the image to the private warehouse of Harbor. ...

Focus on WeChat official account [white letter], enter whitek's knowledge sharing planet. 🌍 preface Last Friday, I interviewed the third side of byte and deeply felt the importance of database knowledge. I also realized that I was weak in my usual study of database. Even after having some internship experience, I still don't have much know ...

1. PrefaceIn SQL development, multi table associated query is a skill that cannot be bypassed. The same query results are written in different ways, and their operation efficiency is also very different.In the actual development, I have seen (it seems to have written ~) many long and smelly query SQL. It is common to check the data for more tha ...

What is a transaction 1. What is a transaction Transaction refers to a set of sql statements, in which there are multiple sql statements It may be insert, update, select or delete. We hope that these multiple sql statements can succeed or fail. The execution of these sql statements is consistent and executed as a whole. 2. When do y ...

preface 🦁 entity+Dao Model - very important Dao-Table name Dao-Add, delete, modify and query a table - it will be simplified into an interface later entity-Corresponding to the entity table in the database (table name, attribute, method) 🐅IDEA Bring your own Database JDBC Foundation (1) JDBC principle JDBC (Java Database Conne ...

Install MySQL 5.0 on Windows 10 at the same time 7 and MySQL 8 versions 1, Download two versions of MySQL Enter the official website to download: https://www.mysql.com/ Click Downloads Slide down to find MySQL Community Server Directly enter the MySQL 8 version, and then download the compressed package version Click the previous version in ...

explain field description Adding explain in front of the sql statement to be executed can simulate the execution process of the statement by the optimizer. Example description: explain select * from sys_user; explain will return one or more pieces of data. The meaning of each column is explained below: 1. id execution order. This is a relat ...

Comparison operator= <=> <> != < <= > >= The comparison operator is used to compare the operands on the left and right of the expression. If the comparison result is true, it will return 1, if the comparison result is false, it will return 0, and in other cases, it will return NULL.Comparison operators are often us ...

ELK log analysis 1, ELK introduction ELK platform is a complete set of centralized log processing solution, which combines ElasticSearch, Logstash and Kiabana, three open-source tools to meet the more powerful user requirements for log query, sorting and statistics. Elastic search: it is a distributed storage and retrieval engine based on L ...