1. Classification of database languages
DDL: Database Definition Language
Used to create, modify, and delete data structures within a database, such as:
1: Create and delete databases (CREATE DATABASE || DROP DATABASE);
2: Create, modify, rename, delete tables (CREATE TABLE | ALTER TABLE | RENAME TABLE | DROP TABLE, TRUNCATE TABLE);
3: Create a ...
Posted by timmerk on Tue, 11 Feb 2020 20:46:07 -0800
Summary of this section
This section mainly realizes the final function of the software and some summary of the project.
About the function of software
The function of the software is to pop up a dialog box, tell the user some information about the software, and use the JDialog of swing to comp ...
Posted by opalelement on Tue, 11 Feb 2020 09:50:28 -0800
In today's web development, the authentication of security rights has always played an important role, so Spring has also produced its own security module, but this is a relatively heavy framework, configuration is quite cumbersome. Later, shiro, a lightweight security framework, emerged. The ...
Posted by spaze on Tue, 11 Feb 2020 05:32:51 -0800
Core: success or failureAtomicity
Both succeed or fail
The data integrity before and after the transaction should be consistent, 1000
Principle: ACID1. Atomicity
Either they succeed or they fail;
Data integrity before and after transactions should be consiste ...
Posted by nawal on Tue, 11 Feb 2020 02:41:44 -0800
Using spring boot + mybatis + RabbitMQ + redis to simulate the second kill function of the mall
First, we need to install RabbitMQ. Before installing RabbitMQ, we need to install Erlang, because RabbitMQ is based on Erlang. For specific steps, click the following link:
After installation, RabbitMQ i ...
Posted by newjsguy on Tue, 11 Feb 2020 01:49:52 -0800
1. Summary of Previous Situation
This is a tree traversal implementation. To focus on how queues are implemented, follow these articles:Data structure (3) Handwritten queues2. Basic concepts of trees
Chain lists, stacks, and queues are one-to-one linear structures, one-to-many linear structures - trees. ...
Posted by amrigo on Mon, 10 Feb 2020 21:47:25 -0800
Can be manipulated with shell scripts mysqldata base , mysql-e parameter can be used to perform various sql operations (create, delete, add, delete, change, check).
The sql statement of mysql-hhostname-Pport-uusername-ppassword-e related MySQL allows you to manipulate mysql's methods in a shell without running MySQL at ...
Posted by n14charlie on Mon, 10 Feb 2020 08:26:27 -0800
In Web application development, security has always been a very important aspect. In the huge spring ecosystem, the authority verification framework is also very perfect. Among them, spring security is very easy to use. Today, I'd like to record a spring security related problem encountered in development.
When using ...
Posted by V-Man on Mon, 10 Feb 2020 08:07:01 -0800
Made by two couples
1. Basic environment preparation
Step 1: download the installation package
# wget -P /app/tools/ https://mirrors.tuna.tsinghua.edu.cn/apache/tomcat/tomcat-8/v8.5.50/bin/apache-tomcat-8.5.50.tar.gz
# wget -P /app/tools/ http://188.8.131.52/jd ...
Posted by deejay on Mon, 10 Feb 2020 05:59:16 -0800
Chapter 4 MyBatis mapping file
4.1 introduction to mybatis mapping file
The real power of MyBatis lies in its mapping statement and its magic. Because of its extraordinary power, the XML file of mapper is relatively simple. If you compare it with JDBC code with the same function, you will immediate ...
Posted by wtg21.org on Mon, 10 Feb 2020 04:20:58 -0800