Tag:field

  • “Free and open source” business data addition, deletion, modification and query of crudapi background management system of front-end spa project based on Vue and Quasar (7)

    Time:2021-10-27

    Actual business data of front-end spa project based on Vue and Quasar (7) review Through the previous articleTable of actual combat relationship of front-end spa project based on Vue and Quasar (6)The metadata design function is fully realized. This paper mainly introduces the crud addition, deletion, modification and query function of business data. brief introduction […]

  • 6.3 installation and basic use of docker compose

    Time:2021-10-27

    https://docs.docker.com/compose/install/#install-compose Create and start the container Docker compose will be found in the current directory by defaultdocker-compose.ymlfile docker-compose up With the – D parameter, it can be executed in the background, so as not to output log all the time, resulting in failure to exit Start service docker-compose  start Out of Service docker-compose stop Stop […]

  • Thread synchronization technology summary

    Time:2021-10-27

    Note: sort out some synchronization technologies for future review. At present, the technology is still learning, and the new knowledge of synchronization will be added to this article. Single machine multithreading: synchronized1. Interpretation: (1) JVM level synchronization technology, bytecode implementation. When there is a problem in code execution (such as throwing an exception), the JVM […]

  • Golang reflection

    Time:2021-10-24

    reflex How to dynamically obtain the type or value information of an object? Passing is reflection Reflection refers to the ability of a program to access, detect and modify its own state or behavior during runtime. The simple understanding is to dynamically obtain what the object has (fields), what it can do (Methods), and even […]

  • Talk about flynk’s timecharacteristic

    Time:2021-10-24

    order This paper mainly studies the timecharacteristic of Flink TimeCharacteristic flink-streaming-java_2.11-1.7.0-sources.jar!/org/apache/flink/streaming/api/TimeCharacteristic.java /** * The time characteristic defines how the system determines time for time-dependent * order and operations that depend on time (such as time windows). */ @PublicEvolving public enum TimeCharacteristic { /** * Processing time for operators means that the operator uses the system […]

  • Indexing principle and slow query optimization

    Time:2021-10-24

    introduce This blog will introduce the following knowledge: Index introduction Indexing principle Data structure of index (binary tree — > balanced binary tree — > b tree — > b + tree) Clustered index and secondary index MySQL index management Syntax for creating and deleting indexes Test after index creation (change in query speed) How […]

  • Read the optimistic lock, pessimistic lock and mvcc in the database

    Time:2021-10-23

    preface In the actual use of the database, we often encounter situations where we don’t want the data to be written or read at the same time. For example, in the second kill scenario, two requests read that there is still one inventory in the system at the same time, and then update the inventory […]

  • Set a date? Hospital. Net core system? Wire up CPU double up error

    Time:2021-10-23

    One (via smart)/ h2> 1. Fault/ h3> There are programs added Wx and added in the next periodCPU + cable ▼The higher the height, the higher the height, the lower the height, the lower the height, the lower the height, and the lower the height, the lower the height, the lower the height, the lower […]

  • Mybatis extension — General mapper and dynamic resultmap

    Time:2021-10-21

    preface The JPA used by the company in the past is very convenient. For new projects, I choose to use mybatis. SQL is written in XML files. Although the basic methods are generated by tools, once a field is added to the data, it is really uncomfortable to modify these methods. Moreover, I feel really […]

  • Detailed explanation of form schema definition

    Time:2021-10-21

    Author: Wang Xi background The previous issue shared the implementation principle of form designer based on formalily. JSON schema is the language for communication between form designer and form rendering component. In order to better understand the core of form designer, this issue will explain the detailed format of form schema and quick start practice […]

  • MySql-Day-01

    Time:2021-10-20

    MySql Be able to understand the concept of database Can install MySQL database Be able to start, shut down and log in to MySQL Be able to operate the database with SQL statements Ability to manipulate table structures using SQL statements SQL statements can be used to add, modify and delete data Ability to add […]

  • Nearly 8000 words of spring / springboot common annotation summary! Arrange!

    Time:2021-10-20

    @[toc] 0. Preface Hello, I’m brother! This is my 221 high-quality original articles. If you need to reprint, please indicate the address at the beginning of the text, crab! This article has been included in my 89K star Java open source project javaguide:https://github.com/Snailclimb/JavaGuide It is no exaggeration to say that the common spring / springboot […]