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java

A collection of 2344 posts

java

Five data types of Redis

Five data types of RedisRedis is an open source (BSD licensed), in-memory data structure storage system, which can be used as a database, cache and consumer Information middleware MQ. It supports multiple types of data structures, such as strings, hashes, lists (lists), sets, sorted sets and range queries, bitmaps, hyperloglogs

programmer

Meituan learning method + interview experience! One year of Java development, and a low degree of education successfully got 30 KOffer!

​Personal backgroundAs the title indicates, my personal background is very simple. I have 1 and a half years of Java development experience, ordinary education, and 2 bachelor degrees. After graduation, I have been in Crud. The repeated work in the company every day does not help me to improve my

MyBatis entry series (3)-MyBatis global configuration file detailed 2

7. Object Factory (objectFactory)Official description : Every time MyBatis creates a new instance of the result object, it will use an ObjectFactory instance to complete the instantiation work. What the default object factory needs to do is to instantiate the target class, either through the default no-parameter construction method, or

java

SQL statement optimization log

An introduction to SQL statement optimization1. SQL statement optimization explanation1 For specific requirements, use a better SQL strategy or index strategy to achieve shorter results presentation time,The process of improving operational efficiency is SQL optimization.2 SQL optimization is included in database-level optimization. What we usually call SQL optimization

java interview questions

68 Redis+168 MySQL high-frequency compulsory interview questions (don’t regret it if you don’t brush)

When it comes to Redis and MySQL, they are the two pits that many programmers (yuan) friends must step in when they are interviewing. So, what are the interviewers' favorite questions about Redis and MySQL? Don’t panic if you don’t know, I’ve sorted out these “68 Redis+

algorithm

Are Java interviews just memorizing answers?

To be honest, it will not work if you don't memorize it. You must understand these questions! Because there are too many words, only interview questions are given in categories, and the answer to each question is at the end of the article1. 32 MySQL interview questions1: Do you understand

database

Ali on the second side: How to solve the MySQL deadlock problem?

Hello everyone, I am the wolf king, a programmer who loves to play There is a high probability that we will encounter deadlock when using MySQL, which is really a very headache. This article will give a corresponding introduction to deadlock, analyze and discuss common deadlock cases, and give some

There are big factories in Wuhan all around, oh, let’s get an offer!

Written in front:While actively preparing for the big factory, we should also pay attention to some of the actual interview situation and difficulty of the big factory, and feel the atmosphere of the big factory. The series of articles are continuously updated. Partners with good interview questions can also

programmer

Too complete, I am stupid! A summary of the Java interview questions with 500,000 words!

​How to write the project experience?​It is normal to have one or two project experiences on the resume, but very few can really show the project experience well to the interviewer. For the project experience, you can consider writing from the following points: ​1. A feeling about the overall

ant classroom 6th actual combat project video notes

Based on Vue+SpringCloudAlibaba Microservice E-commerce Project Actual Combat-Building Member Service-010: Quickly Integrate WeChat Joint Login Based on the Strategy Model

010: Quickly integrate WeChat joint login based on the strategy model1 Integrated WeChat joint login effect demonstration2 Principles of WeChat Joint Login to Obtain User Information3 Generate WeChat oatuh2.0 authorization link address4 Obtain user's basic information according to openid5 Quickly integrate WeChat joint login based on the strategy model6

javaee-mvc

SpringMVC-the initial use of JdbcTemplate

Article DirectoryJdbcTemplate functionA simple introductionRecord the errors encountered in the middleUse JdbcTemplate by configuring BeanUse of the Update methodInquireMultiple result querySingle result queryAggregate queries (simple classes where the result is a number)summary:JdbcTemplate functionHe is the part of the database encapsulated in MVC, and it is also a tool.

java understanding

On June 3rd, Xindehui Java Internship Interview Summary

Zhuhai Xindehui Beijing Area In the online video interview notified that day, the mobile phone WeChat video call was used, and the mobile phone was fixed in a place where the computer screen can be photographed. There was no interview environment at the time, but I went anyway. . .written examinationbasisWhat

dachang interview questions

It’s hard to explain AQS, but the interviewer asked me to talk about the application scenarios, so I had to talk about CountDownLatch again~~~

Article DirectoryPrefaceCountdownLatch source code explanationCountDownLatch constructorcountDown() icon, source code explanationawait() icon, source code explanationto sum upCSDN exclusive benefits are coming! ! !At last PrefaceThe bloggers have been wandering in the Niuke Mianjing area all the year round, summarizing the high-frequency exam questions from big companies such as Byte, Ali, Baidu, Tencent,

development

Technical dry goods | How to implement IM SDK full text retrieval of chat messages on Electron

Guide reads : On the IM client demand scenario, full-text search based on local data (Full-text search) plays an important role. This article specifically talks about how NetEase Yunxin implements full-text retrieval. Article｜Li Ning, Senior Front-end Development Engineer, NetEase Yunxin The so-called full-text search is a technique to find the

database

Database learning record 01

Database learning recordsThe location and status of the databaseDatabase typeIntroduction to DatabaseSQL is a standard computer language used to access and process databases . SQL (Structured Query Language: Structured Query Language) is used to manage relational database management systems (RDBMS). The scope of SQL includes data insertion, query, update, and deletion,

database

SAP Tips Use EXPORT/IMPORT to save special data

Click on the blue word to follow us 01 Preface In a specific program, multiple variables, structures, and internal tables may need to be stored. Later, you need to read the previously stored data again. There is no need for data retrieval for the stored data, as long as it

java

Grain Mall Order Process

Grain Mall Order ProcessThe premise is that there is no login Redis before joining (this is the shopping cart of the previously logged-in user) add to Shopping Cart Click the shopping cart to check out (Note the redis at this time:) A key of the unlogged user is temporarily stored

database

It took me 5 months to get through 300 pages of Ali P8 pure hand-printing, and to understand Redis deeply, and successfully joined Ant

PrefaceRedis is an open source log-based, Key-Value database written in ANSIC language, supporting the network, memory-based or persistent, and provides APIs in multiple languages. From March 15, 2010, the development of Redis is hosted by VMware. Since May 2013, the development of Redis has been sponsored by Pivotal. Redis supports

wechat development

(7) Official account development-custom menu

Official Account Development-Passive Message ReplyA custom menu is an essential function for official account development. The interaction between official account users and the background is basically completed in the menu. A custom menu allows the menu under the official account to have more menu events and menu functions. This column

java

SpringBoot integration Flowable workflow-2 (code integration)

Article Directory1 Introduction2. Code add dependencies3. Create a database3.1 SQL provided by Flowable3.2 The application automatically creates a database (recommended)4. Code section4.1 Several commonly used Service classes4.2 Process definition related code4.2.1 Release process definition4.2.2 Query process definition4.2.3 Get process

code audit

JNDI injection of Java code audit series

JNDI injection of Java code audit series0x01 PrefaceWhen mining or exploiting Java deserialization vulnerabilities, concepts such as RMI, JNDI, and JRMP are often encountered. Among them, RMI is a Java remote method invocation mechanism based on serialization. As a common deserialization entry, it is inextricably related to deserialization vulnerabilities. In

java

Automatically refresh Redis via MySQL

In the server-side development process, a relational database such as MySQL is generally used as the final storage engine. In fact, Redis can also be used as a key-value pair database, but in some practical scenarios, especially the relational structure is not suitable for use. Redis directly acts as a

java

Confession of a programmer

Hello everyone, today I will introduce to you an original author: Su San talks about technology. Su San works for a well-known Internet company, engaged in development, architecture and part of the management work. Have some research on the source code of open source frameworks such as spring, springboot, springcloud,

java

Alibaba wins offer rating P7, the latest and most comprehensive Alibaba 68 advanced interview questions in 2020

PrefaceWhen I recently got together and chatted with a few friends on May Day, I found out that the new wave of recruitment peak season may be about to begin. The new beginning of 2021 is not very good. The recruitment is still under great pressure. As a developer, have

java

Network programming study notes (crazy god sauce)

network programming1.1 ConceptMake a call-connect-answer the call and call: TCP Send a text message-send it and wait for it to complete the transportation-the receiving is called: UDP What is a computer network : computer network refers toGeographic locationDifferent multiple computers with independent functions and their peripheral devices, throughCommunication lineConnect inNetwork