Programmer Help

Sets are composed of a set of disordered and unique (non-repeatable) items, which have the same limitation as our set of high school mathematics.Most of this data structure is used to store unique elements. aggregate Creating Collection Classes class Set { constructor() { this.items = {}; } Verify whether an element exists in a collecti ...

In industrial monitoring, it is necessary to record daily data. After a long time, the database is easy to burst. At this time, if allowed, the previous data can be cleared once, recording only a few months of data. delimiter $ DROP PROCEDURE if exists p_clearOldData; /* g_date_limit Time limits, such as 2019_08, delete tables before tha ...

Oracle can save Redo Log online log files to many different locations. The process of converting online log to archive log is called archiving, and the corresponding log is called archive log. The archive log can be used to restore the database, so it records various operations of the database. If we ne ...

Configuration of pom.xml <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>s ...

This article is roughly recorded. eudore-website acl, rbac, pbac authentication and ak, token, bear authentication are realized. Please see the complete details. Source code. Online demo User passwords are guest. Authentication design eudore-website uses ak, token and bearer to authenticated three kinds of comprehensive authentication. The pri ...

Campus Activity Platform Project (swing+mysql) After studying JAVASE in the school studio for some time, we completed the studio project. Project requirements: I. Blue Point Campus Activity Platform Basic needs: 1. With login and registration function 2. Administrator Audit activities (decid ...

Setting up pneumatic execution times (checking table records once a day) public class DayInterval implements ServletContextListener{ private static SimpleDateFormat simpleDateFormat=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); public static void showDayTime() { Timer dTimer = new Timer(); dTimer ...

I. Connecting to MySQL Server import pymysql # Connect to the database and call the Connect function (the Connect function returns an object of Connection) conn = pymysql.Connect(host='localhost', #Host ip port=3306, #port user='user', #User name ...

One-way many-to-one There are multiple configurations. @Entity @Table(name="t_product") public class Product { @Id @GeneratedValue private Long id; private String name; //To configure @ManyToOne @JoinColumn(name="dir_id")//Foreign key private ProductDir dir ; Note: ...

The title is as follows: The Employee table contains all employee information, and each employee has its corresponding Id, salary and departmental Id. +----+-------+--------+--------------+ | Id | Name | Salary | DepartmentId | +----+-------+--------+--------------+ | 1 | Joe | 70000 | 1 ...