One financial APP system every day [Android end + front end + back end]

Yesterday, a fan friend also wanted to learn how to develop Web, applet and Android. He asked if he could learn it in college? What I learned in school is really limited: In many colleges and universities, some professors are academic, and they have not done much development work. In class, they just follow the book, and their knowledge point ...

Posted by skali on Thu, 04 Aug 2022 21:47:07 +0300

A simpler way to use Spring

Some of the most basic methods of storing and reading Bean objects have been described before, but they are not used in Spring at all. So this blog will introduce a simpler method of storing and reading Bean objects. The core of what you want to do is to use annotations. Let's take a look below. Catalog ?? Store Bean Objects ?? ...

Posted by The14thGOD on Thu, 04 Aug 2022 21:30:46 +0300

MySQL - slow query log analysis

Article catalogue MySQL - slow query log analysis 1. Start and set slow query log2. Data preparation3. Slow query log analysis tool: mysqldumpslow4. Delete slow query log5,show profile MySQL - slow query log analysis MySQL's slow query log is a kind of log record provided by mysql. It is used to record the statements whose response ...

Posted by razvypp on Tue, 02 Aug 2022 21:39:47 +0300

LRU and LFU algorithm (page replacement algorithm)

Differences between LRU and LFU Both LRU and LFU are page replacement algorithms for memory management. LRU: Least Recently Used (longest time) elimination algorithm. LRU is the page that has not been used for the longest time. LFU: Least Frequently Used. LFU is the least used page in a period of time. example Assume that th ...

Posted by latinofever on Mon, 01 Aug 2022 21:07:12 +0300

Kotlin - delay initialization and sealing classes

1, lateinit delay initialization keyword Many syntax features in Kotlin, such as variable immutability, variable non nullability, and so on, are designed to ensure program safety as much as possible. For example, there are many global variable instances in your class. In order to ensure that they can meet Kotlin's null pointer check sta ...

Posted by Cut on Sun, 31 Jul 2022 22:28:16 +0300

SpringBoot integration springcloud Alibaba Seata details

SpringCloud Alibab-Seata Introduction: Seata is an open source distributed transaction solution, which is committed to providing high-performance and easy-to-use distributed transaction services under the microservice architecture. Seata will provide users with AT, TCC, SAGA and XA transaction modes to create a one-stop distributed soluti ...

Posted by kporter.porter on Sun, 31 Jul 2022 21:07:19 +0300

Quickly master MyBatis framework

Article catalogue 1, Foreword 1.1 database and table1.2 entity class1.3 MyBatisX plug-in1.4 SQL log view configuration 2, Multi table query 2.1 one to one2.2 one to many 3, Dynamic SQL usage 3.1 < if > label3.2 < trim > label3.3 < where > label3.4 < set > label3.5 < foreach > label 1, Forewor ...

Posted by mithras on Sat, 30 Jul 2022 21:38:10 +0300

Springboot Alipay sandbox payment - complete and detailed steps

1. Enter Alipay development platform sandbox environment Sandbox environment - Alipay Document Center 1.1. Enter personal sandbox environment Click to enter the sandbox environment and log in with Alipay Sandbox management interface is shown in the figure appid, Alipay gateway, custom key, etc Here is the account number and password of ...

Posted by Mike-2003 on Sat, 30 Jul 2022 21:14:49 +0300

Basic syntax of MySQL DDL and DML and DQL

preface SQL statement, namely structured query language, is a programming language for special purposes. It is a database query and programming language, which is used to access data, query, update and manage relational database systems. It is also an extension of database files. The SQL statements specified in the SQL standard are divided in ...

Posted by Noctagon on Sat, 30 Jul 2022 09:58:45 +0300

Using Baidu map open source code to realize positioning and real-time path tracking

First demonstrate the effect: (the video can't be played, and the pictures make up the number) Ideas and steps of real-time path: Idea: if you need to realize real-time tracking on the map, you first need to realize the positioning function. On the basis of realizing the positioning function, you need to draw the walking track on the map, ...

Posted by realnsleo on Tue, 24 May 2022 20:03:34 +0300