Entity 만들기

저번 시간에는 컨트롤러와 서버가 통신하는데 사용되는 객체인 DTO를 생성했다면
이번시간에는 DB랑 Repository가 통신할때 사용되는 객체인 Entity를 생성한다.

저번에 생성했던 blog.dto 안에 entity 라는 package를 생성하고,

또 그 안에 New> Kotlin> entities.kt 생성한다.

생성하면 default는

package com.example.study.blog.dto.entity

이것만 작성돼있다.

class Wordcount(
	val word: String,
    val cnt: Int = 0
)

클래스를 생성하고 이것이 Entitiy라는것을 알려주기위해 Class 위에 @Ent정도 까지 치고 나오는 자동완성기능을 선택한다.

선택하고나면, import랑 @Entity가 자동으로 입력된다.

추가로 word가 키값이였기 때문에 word 앞에 @id를 입력하고 나온 persistence를 선택한다.

그러면 @Id와 import persistence.Id가 추가된다.

이렇게 생서앻두고 이 어플리케이션을 구동을 하면 Wordcount라는 테이블이 생성 될 것이다.

메인 kt파일로 돌아와서 실행

로그 기록을 보면 기존에 있을 wordcount를 drop(삭제)하고 새로운 wordcount 라는 테이블을 생성했다.
DBeaver를 통해 확인해보면
저번에 연결한 DB/study/table안에 wordcount라는 테이블이 생성된것을 확인할 수 있고, Columns 안에 작성했던 cnt Int와, word varchar가 생성됐다.

실행로그.

"C:\Program Files\Java\jdk-20\bin\java.exe" "-javaagent:C:\Program Files\JetBrains\IntelliJ IDEA Community Edition 2023.3.5\lib\idea_rt.jar=58979:C:\Program Files\JetBrains\IntelliJ IDEA Community Edition 2023.3.5\bin" -Dfile.encoding=UTF-8 -Dsun.stdout.encoding=UTF-8 -Dsun.stderr.encoding=UTF-8 -classpath 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com.example.study.StudyApplicationKt

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::                (v3.2.4)

[13:35:44.592][INFO ][com.example.study.StudyApplicationKt.logStarting:line50] - Starting StudyApplicationKt using Java 20 with PID 21368 (C:\Users\SmileB\Desktop\kakaopay\SpringKotlinAPI\study\build\classes\kotlin\main started by SmileB in C:\Users\SmileB\Desktop\kakaopay\SpringKotlinAPI)
[13:35:44.596][INFO ][com.example.study.StudyApplicationKt.logStartupProfileInfo:line654] - No active profile set, falling back to 1 default profile: "default"
[13:35:44.735][INFO ][org.springframework.boot.devtools.env.DevToolsPropertyDefaultsPostProcessor.logTo:line252] - Devtools property defaults active! Set 'spring.devtools.add-properties' to 'false' to disable
[13:35:44.735][INFO ][org.springframework.boot.devtools.env.DevToolsPropertyDefaultsPostProcessor.logTo:line252] - For additional web related logging consider setting the 'logging.level.web' property to 'DEBUG'
[13:35:46.270][INFO ][org.springframework.data.repository.config.RepositoryConfigurationDelegate.registerRepositoriesIn:line139] - Bootstrapping Spring Data JPA repositories in DEFAULT mode.
[13:35:46.304][INFO ][org.springframework.data.repository.config.RepositoryConfigurationDelegate.registerRepositoriesIn:line208] - Finished Spring Data repository scanning in 21 ms. Found 0 JPA repository interfaces.
[13:35:47.583][INFO ][org.springframework.boot.web.embedded.tomcat.TomcatWebServer.initialize:line109] - Tomcat initialized with port 9999 (http)
[13:35:47.613][INFO ][org.apache.catalina.core.StandardService.log:line173] - Starting service [Tomcat]
[13:35:47.614][INFO ][org.apache.catalina.core.StandardEngine.log:line173] - Starting Servlet engine: [Apache Tomcat/10.1.19]
[13:35:47.718][INFO ][org.apache.catalina.core.ContainerBase.[Tomcat].[localhost].[/].log:line173] - Initializing Spring embedded WebApplicationContext
[13:35:47.720][INFO ][org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.prepareWebApplicationContext:line296] - Root WebApplicationContext: initialization completed in 2983 ms
[13:35:48.171][INFO ][org.hibernate.jpa.internal.util.LogHelper.logPersistenceUnitInformation:line31] - HHH000204: Processing PersistenceUnitInfo [name: default]
[13:35:48.347][INFO ][org.hibernate.Version.logVersion:line44] - HHH000412: Hibernate ORM core version 6.4.4.Final
[13:35:48.451][INFO ][org.hibernate.cache.internal.RegionFactoryInitiator.initiateService:line50] - HHH000026: Second-level cache disabled
[13:35:48.918][INFO ][org.springframework.orm.jpa.persistenceunit.SpringPersistenceUnitInfo.addTransformer:line87] - No LoadTimeWeaver setup: ignoring JPA class transformer
[13:35:48.976][INFO ][com.zaxxer.hikari.HikariDataSource.getConnection:line110] - HikariPool-1 - Starting...
[13:35:49.209][INFO ][com.zaxxer.hikari.pool.HikariPool.checkFailFast:line565] - HikariPool-1 - Added connection org.mariadb.jdbc.Connection@5cd52106
[13:35:49.211][INFO ][com.zaxxer.hikari.HikariDataSource.getConnection:line123] - HikariPool-1 - Start completed.
[13:35:49.336][DEBUG][org.hibernate.type.descriptor.sql.spi.DdlTypeRegistry.addDescriptor:line64] - addDescriptor(12, org.hibernate.type.descriptor.sql.internal.CapacityDependentDdlType@4aaece9f) replaced previous registration(org.hibernate.type.descriptor.sql.internal.CapacityDependentDdlType@1c52c571)
[13:35:49.337][DEBUG][org.hibernate.type.descriptor.sql.spi.DdlTypeRegistry.addDescriptor:line64] - addDescriptor(-9, org.hibernate.type.descriptor.sql.internal.CapacityDependentDdlType@51b36a1c) replaced previous registration(org.hibernate.type.descriptor.sql.internal.CapacityDependentDdlType@78c667e)
[13:35:49.337][DEBUG][org.hibernate.type.descriptor.sql.spi.DdlTypeRegistry.addDescriptor:line64] - addDescriptor(-3, org.hibernate.type.descriptor.sql.internal.CapacityDependentDdlType@3b6a9a26) replaced previous registration(org.hibernate.type.descriptor.sql.internal.CapacityDependentDdlType@3199b977)
[13:35:49.337][DEBUG][org.hibernate.type.descriptor.sql.spi.DdlTypeRegistry.addDescriptor:line64] - addDescriptor(4003, org.hibernate.type.descriptor.sql.internal.DdlTypeImpl@7b30d6d2) replaced previous registration(org.hibernate.type.descriptor.sql.internal.DdlTypeImpl@1f6bf05c)
[13:35:49.337][DEBUG][org.hibernate.type.descriptor.sql.spi.DdlTypeRegistry.addDescriptor:line64] - addDescriptor(4001, org.hibernate.type.descriptor.sql.internal.DdlTypeImpl@703ff23d) replaced previous registration(org.hibernate.type.descriptor.sql.internal.DdlTypeImpl@c91af4c)
[13:35:49.337][DEBUG][org.hibernate.type.descriptor.sql.spi.DdlTypeRegistry.addDescriptor:line64] - addDescriptor(4002, org.hibernate.type.descriptor.sql.internal.DdlTypeImpl@71ea7e4a) replaced previous registration(org.hibernate.type.descriptor.sql.internal.DdlTypeImpl@31c3893b)
[13:35:49.338][DEBUG][org.hibernate.type.descriptor.sql.spi.DdlTypeRegistry.addDescriptor:line64] - addDescriptor(2004, org.hibernate.type.descriptor.sql.internal.CapacityDependentDdlType@3ee22b24) replaced previous registration(org.hibernate.type.descriptor.sql.internal.DdlTypeImpl@3f08087b)
[13:35:49.338][DEBUG][org.hibernate.type.descriptor.sql.spi.DdlTypeRegistry.addDescriptor:line64] - addDescriptor(2005, org.hibernate.type.descriptor.sql.internal.CapacityDependentDdlType@1d3239fe) replaced previous registration(org.hibernate.type.descriptor.sql.internal.DdlTypeImpl@3015e132)
[13:35:49.338][DEBUG][org.hibernate.type.descriptor.sql.spi.DdlTypeRegistry.addDescriptor:line64] - addDescriptor(2011, org.hibernate.type.descriptor.sql.internal.CapacityDependentDdlType@1f81471f) replaced previous registration(org.hibernate.type.descriptor.sql.internal.DdlTypeImpl@60b5cf44)
[13:35:50.461][INFO ][org.hibernate.engine.transaction.jta.platform.internal.JtaPlatformInitiator.initiateService:line58] - HHH000489: No JTA platform available (set 'hibernate.transaction.jta.platform' to enable JTA platform integration)
[13:35:50.482][DEBUG][org.hibernate.SQL.logStatement:line135] - 
    drop table if exists wordcount
[13:35:50.589][DEBUG][org.hibernate.SQL.logStatement:line135] - 
    create table wordcount (
        cnt integer not null,
        word varchar(255) not null,
        primary key (word)
    ) engine=InnoDB
[13:35:50.629][INFO ][org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.buildNativeEntityManagerFactory:line437] - Initialized JPA EntityManagerFactory for persistence unit 'default'
[13:35:51.654][INFO ][org.springframework.boot.devtools.autoconfigure.OptionalLiveReloadServer.startServer:line59] - LiveReload server is running on port 35729
[13:35:51.720][INFO ][org.springframework.boot.web.embedded.tomcat.TomcatWebServer.start:line241] - Tomcat started on port 9999 (http) with context path ''
[13:35:51.736][INFO ][com.example.study.StudyApplicationKt.logStarted:line56] - Started StudyApplicationKt in 7.95 seconds (process running for 9.089)