The database time is 14 hours slow, Mybatis said. I don't carry this pot!

Colleagues feedback a question: Mybatis was inserted into the database yesterday. Is it because there is a problem generating the code generated by Mybatis reverse engineering?As we all know, I am very interested in such bugs. My intuition tells me that it should not be the Bug of Mybatis, but probably the problem of time zone.Good. Today we ca ...

Posted on Fri, 26 Nov 2021 20:49:24 -0500 by doremi

Overview and usage of methods in Java

Java Procedure Overview of methods Java methods are collections of statements that together perform a function Method is an ordered set of steps to solve a class of problemsMethod is contained in a class or objectMethods are created in the program and referenced elsewhereMethods can have parameters or no parameters Advantages of the me ...

Posted on Fri, 26 Nov 2021 18:16:46 -0500 by TGixer

Database foundation

database Database refers to an organized and shareable data set stored in the computer for a long time. In short, a database is a place to store data. However, its storage method has specific rules. This makes it easy to process data. Database operations include creating and deleting databases. These operations are the basis of database manage ...

Posted on Fri, 26 Nov 2021 17:56:21 -0500 by BizBoy

Architect Essentials: Smart use of Canal for asynchronous, decoupled architecture

This paper describes how to use Canal to implement an asynchronous and decoupled architecture. Subsequent articles will be rewritten to analyze Canal principles and source code. Introduction to Canal Canal is the middleware used to get database changes. Fake yourself as a MySQL slave library, pull the master binlog and parse and process it. P ...

Posted on Fri, 26 Nov 2021 16:46:43 -0500 by badboy1245

[technical grass planting] I built a complete set of big data system with the money of one rougamo

How can a wool party not participate in the promotion of the Eleventh National Congress of the Communist Party of China. Then I plan to come to Tencent cloud to collect wool.Let me share how to use the money of a rougamo to build a big data platform on the cloud. After my repeated study, I found that it was too simple to collect wool. Finally, ...

Posted on Thu, 25 Nov 2021 14:40:34 -0500 by jmrothermel

Database (mysql) learning - (updated irregularly)

# database understanding MySQL DB Database, container for storing data DEMS Database management system, also known as database software or database products, is used to create or manage DB SQL Structured query language, the language used to communicate with the database, is not unique to a database software, but a common language for ...

Posted on Thu, 25 Nov 2021 13:15:57 -0500 by ataria

Numpy study notes

catalogue 1, Using Numpy to create a new two-dimensional matrix 2, Numerical operation: 3, Sort operation 1. Define a matrix 2,   np.sort() function 3. axis parameter 4. np.argsort() function   5. np.linspace() function 6. NP. Lexport() function 4, Array operation 1 np.arange() 2. Array. Shape() function 3 add dimension a ...

Posted on Wed, 24 Nov 2021 21:21:21 -0500 by manishsinha27

Database exercise (continued from last blog post)

        This database exercise is a part of hands-on operation after I summarized the database knowledge points released last time. The focus is to deepen the understanding of the database. In the face of the preparation of sentences, colleagues can criticize and correct more. 1. Create database tables. CREATE DATABASE sch ...

Posted on Wed, 24 Nov 2021 20:07:33 -0500 by c0le

SQL training camp -- Task02: SQL basic query and sorting

This note is the learning content of Alibaba cloud Tianchi Longzhu plan SQL training camp. The link is: https://tianchi.aliyun.com/specials/promotion/aicampsql preface This note is the learning content of Alibaba cloud Tianchi Longzhu plan SQL training camp. The link is: https://tianchi.aliyun.com/specials/promotion/aicampsql 1. Part ...

Posted on Wed, 24 Nov 2021 12:47:59 -0500 by enchance

MySQL Learning Notes (12) - SQL Trigger:

12. SQL triggers MySQL triggers, like stored procedures, are a program embedded in MySQL. Triggers are events that trigger an action, including INSERT, UPDATAE, and DELETE statements. If triggers are defined, they will be triggered when the database executes these statements to perform the appropriate actions. A trigger is a named database obj ...

Posted on Wed, 24 Nov 2021 12:26:07 -0500 by Frame