Quarkus learning IV - project development to deployment

• Write it at the front
  • Project background
  • Responsive and imperative choices
• Development related
  • Database configuration
  • reactive-panache Operating the database < Persistence 、 Check multiple tables >
  • How to use the self increment of the primary key and the default value of the field
• Deployment related ( Tencent cloud )
  • JDK-18
  • Maven-3.8.6
  • git
  • Project start
  • A firewall

Write it at the front

Project background

In writing graduation project , The original intention is to learn quarkus frame , By the way, learn a front-end framework ( Not yet front-end )

But the reality is :

The teacher said to show him the function in a week . I was stunned in an instant : The back-end frame is now learning , The front end won't . Review the html+css+js Started writing projects , Here we will mainly use quarkus And project deployment ( Not docker) Sort it out

• Project code
• Tencent cloud server trial 1 Months ,2022 year 8 The month expires

Responsive and imperative choices

1. master Branch : imperative
2. reactive_mode Branch : Response type

After the basic functions are developed with responsiveness , When the page click frequency is high

1. Front end error reporting : Provisional headers are shown
2. Back end error : io.vertx.core.impl.NoStackTraceThrowable

May use improper posture , But according to the code written on the official website, there are more or less quarkus Of reactive Unstable factors . Therefore, it is changed to imperative programming mode later . You have to hand in your homework , There is no time to waste …

Development related

Database configuration

Official documents

There is a little pit here ,reactive And imperative mode , The values of database configuration key value pairs are different

1. reactive: mysql://127.0.0.1:3306/test
2. imperative : jdbc:mysql://127.0.0.1:3306/test

reactive-panache Operating the database < Persistence 、 Check multiple tables >

Persistence example :

    @POST
    @Path("/create")
    @Blocking
    public Uni<BaseResponse<Long>> create(ChannelAccount channelAccount) {
        // You need to call flush after , In order to return to id,  pure persist It can be saved correctly but cannot return self incrementing id
        Uni<ChannelAccount> persist = channelAccount.persistAndFlush();
        return persist.onItem()
                .transform(account -> account.getId())
                .onItem()
                .transform(BaseResponse::success);
    }

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Multi table result set returns :

    @GET
    @Produces(MediaType.TEXT_HTML)
    @Blocking
    public Uni<TemplateInstance> store(@QueryParam("name") String name) {
        Uni<List<Store>> storeListUni = Store.findAll().list();
        List<Store> storeList = storeListUni.await().indefinitely();

        Uni<List<DeliveryStrategy>> strategyListUni = DeliveryStrategy.findAll().list();
        List<DeliveryStrategy> strategyList = strategyListUni.await().indefinitely();

        return Uni.createFrom()
                .item(() -> {
                    TemplateInstance instance = store.data("storeList", storeList)
                            .data("strategyList", strategyList)
                            .data("name", name);
                    return instance;
                });

    }

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How to use the self increment of the primary key and the default value of the field

public class ChannelAccount extends PanacheEntityBase {
    //`id` bigint(20) NOT NULL AUTO_INCREMENT,
    //PRIMARY KEY (`id`)
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    //`create_time` datetime DEFAULT CURRENT_TIMESTAMP COMMENT ' Creation time ',
    @Column(name = "create_time", insertable = false, updatable = false)
    private LocalDateTime createTime;

    //  `update_time` datetime DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT ' Update time ',
    @Column(name = "update_time", insertable = false, updatable = false)
    private LocalDateTime updateTime;

    }

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Deployment related ( Tencent cloud )

JDK-18

use wget Installation ;

step	function
1. download tar package	wget jdk Official tar.gz package
decompression	tar -zxvf tar.gz
Configure environment variables	vi /etc/profile
Configuration takes effect	source /etc/profile
test	java -version

export JAVA_HOME=/usr/java/jdk-18.0.1.1
export CLASSPATH=${JAVA_HOME}/lib:$CLASSPATH
export PATH=$PATH:${JAVA_HOME}/bin

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Maven-3.8.6

maven Same operation wget Command to install

step	function
download tar package	wget maven Official tar.gz package
decompression	tar -zxvf apache-maven-3.8.6-bin.tar.gz
Configure environment variables	modify /etc/profile file , Add environment variables
Configuration takes effect	source /etc/profile
View version	mvn -v

export MAVEN_HOME=/usr/maven/apache-maven-3.8.6
export PATH=$PATH:${MAVEN_HOME}/bin

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git

sudo apt-get install git

As a server , If you can pull the code , So we use https Agreement to use git Command the project clone

Project start

cd To the project directory

mvn quarkus:dev This belongs to the development mode , The effect of implementation is no effect , Because this external cannot be accessed , The right posture is :

1. mvn clean package -U -Dquarkus.package.type=uber-jar
2. nohup java -jar target/{project}.jar

---

• uber: It refers to packaging the project and its dependencies
• nobup: It refers to making the project run in the background , direct java -jar Once the interface is closed, the service disappears

A firewall

The port number will be exposed in the settings of ECS

At this time, you can correctly access the project on the Internet