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qt login interface is simple to make, which is a real nanny level!!! Engineering innovation practice in the second week: create a form, design the user login interface (including user name and password), and realize the user login function. When the user submits the login button, he is required to obtain the user name and password data in the ...

1, innodb core feature transaction 1. What is a transaction # What is a transaction Opening a transaction can contain multiple transactions sql Statement, so sql Statements either succeed or fail at the same time, which becomes the atomicity of the transaction # effect It ensures the security of data operation When you operate multiple ...

Sub database and sub table Sub database: the process of splitting a single database into multiple databases, scattering data in multiple databases. Split table: the process of splitting a single table into multiple tables, scattering data in multiple tables. Why do you want to separate databases and tables? Keywords: improve performance ...

At the beginning of this article, we will publish a series of articles to show you a go zero micro service example in detail. The whole series is divided into ten articles, and the directory structure is as follows: Environment construction (this paper) Service splitting User services Product service Order service Payment services ...

Written test question 66: latest login date of each person of Niuke (I) Detailed description: please write an sql statement to query the last login date of each user, and press user_id ascending sort Problem solving ideas Group by userid and take the maximum login time source code select user_id, max(date) from login group by user_id order ...

MySQL basic syntax 1, Mysql Foundation Classification of SQL: 1,DDL—Data definition language( Data Define Language): create(Create), alter(Modification), drop(Delete), TRUNCATE(Truncation), RENAME(Rename); 2,DML—Data manipulation language( Data Manipulation Language): select(Query), delete(Delete), update(Update), insert(New); 3,DCL—Data con ...

Python wechat ordering applet course video https://edu.csdn.net/course/detail/36074 Python practical quantitative transaction financial management system https://edu.csdn.net/course/detail/35475 How to troubleshoot and solve the MySQL deadlock problem in the production environment? This paper will simulate the real deadlock scenario for tro ...

Introduction to TiDB TiDB is an open-source distributed relational database independently designed and developed by PingCAP company. It is an integrated distributed database product that supports both online transaction processing and online analytical processing (HTAP). It has horizontal expansion or reduction, financial level high av ...

Note: mysql5.0 is used here 7.29 instantiate, install and deploy on two machines respectively. 106.13.145.174/3306 (Master) and 39.101.213.45/3306 (slave) 1. Install on two machines respectively, and install mysql-5.7.29 decompression version 1.1 upload the installation package to / usr/lcoal tar -zxvf mysql-5.7.29-linux-glibc2.12-x86 ...

0. Introduction The official java clients of elasticsearch include tranport client and rest high level client, but the operation of index addition, deletion, modification and query is not simple enough. Therefore, we introduce spring data elasticsearch to implement CRUD of index 1. Version correspondence Before introducing spring data, we sh ...