refactor[switch-db]: postgre에서 mysql 변경

Author: DooHyoJeong

backend/build.gradle

@@ -34,7 +34,7 @@ dependencies {
     compileOnly 'org.projectlombok:lombok'
     developmentOnly 'org.springframework.boot:spring-boot-devtools'
     runtimeOnly 'com.h2database:h2'
-    runtimeOnly 'org.postgresql:postgresql'
+    runtimeOnly 'com.mysql:mysql-connector-j'
     annotationProcessor 'org.projectlombok:lombok'
     testImplementation 'org.springframework.boot:spring-boot-starter-test'
     testImplementation 'org.springframework.security:spring-security-test'

backend/docker-compose.yml

@@ -1,18 +1,32 @@
 version: '3.8'
 
 services:
-  postgres:
-    image: postgres:latest
-    container_name: postgres
-    restart: always
+  mysql:
+    image: mysql:8.4
+    container_name: mysql
+    restart: unless-stopped
     environment:
-      POSTGRES_DB: ${DB_NAME}
-      POSTGRES_USER: ${DB_USER}
-      POSTGRES_PASSWORD: ${DB_PASS}
+      MYSQL_DATABASE: ${DB_NAME}
+      MYSQL_USER: ${DB_USER}
+      MYSQL_PASSWORD: ${DB_PASS}
+      # 새 변수: 루트 계정 비번 (필수)
+      MYSQL_ROOT_PASSWORD: ${DB_ROOT_PASS}
+      TZ: Asia/Seoul
     ports:
-      - "${DB_PORT}:${DB_PORT}"
+      # 호스트 포트는 원하는 값으로, 컨테이너는 3306 고정
+      - "${DB_PORT:-3306}:3306"
     volumes:
-      - postgres-data:/var/lib/postgresql/data
+      - mysql-data:/var/lib/mysql
+    command: >
+      --character-set-server=utf8mb4
+      --collation-server=utf8mb4_0900_ai_ci
+      --default-time-zone=Asia/Seoul
+      --skip-log-bin
+    healthcheck:
+      test: ["CMD", "mysqladmin", "ping", "-h", "127.0.0.1", "-p${DB_ROOT_PASS}"]
+      interval: 10s
+      timeout: 5s
+      retries: 10
 
 volumes:
-  postgres-data:
+  mysql-data:

backend/src/main/resources/application-dev.yml

@@ -1,6 +1,6 @@
 spring:
   datasource:
-    url: jdbc:h2:./db_dev;MODE=PostgreSQL
+    url: jdbc:h2:./db_dev;MODE=MySQL
     username: sa
     password:
     driver-class-name: org.h2.Driver

backend/src/main/resources/application-prod.yml

@@ -1,14 +1,31 @@
 spring:
   datasource:
-    url: jdbc:postgresql://${DB_HOST}:${DB_PORT}/${DB_NAME}
-    driver-class-name: org.postgresql.Driver
+    url: jdbc:mysql://${DB_HOST:localhost}:${DB_PORT:3306}/${DB_NAME}?useUnicode=true&characterEncoding=utf8&serverTimezone=Asia/Seoul
+    driver-class-name: com.mysql.cj.jdbc.Driver
     username: ${DB_USER}
     password: ${DB_PASS}
+    hikari:
+      maximum-pool-size: 20          # 트래픽에 맞춰 조정
+      minimum-idle: 5
+      idle-timeout: 30000
+      connection-timeout: 30000
+      max-lifetime: 1800000          # MySQL wait_timeout(기본 28800)보다 짧게
   jpa:
+    open-in-view: false              # 프로덕션 권장
     hibernate:
-      ddl-auto: validate
-  thymeleaf:
-    cache: true
+      ddl-auto: validate             # 운영 DB는 보통 validate (또는 none)
+    properties:
+      hibernate:
+        dialect: org.hibernate.dialect.MySQL8Dialect  # 부트가 자동 감지하지만 명시해도 OK
+        format_sql: false
+  sql:
+    init:
+      mode: never                    # 운영에서 스키마 자동 실행 금지
+server:
+  tomcat:
+    threads:
+      max: 200
 logging:
   level:
-    root: INFO
+    root: INFO
+    org.hibernate.SQL: WARN

backend/src/main/resources/application-test.yml

@@ -1,6 +1,6 @@
 spring:
   datasource:
-    url: jdbc:h2:mem:db_test;MODE=PostgreSQL
+    url: jdbc:h2:mem:db_test;MODE=MySQL
     username: sa
     password:
     driver-class-name: org.h2.Driver

backend/src/main/resources/application.yml

@@ -4,12 +4,12 @@ spring:
   application:
     name: back
   profiles:
-    active: dev
+    active: prod
   output:
     ansi:
       enabled: always
   datasource:
-    url: jdbc:h2:./db_dev;MODE=PostgreSQL
+    url: jdbc:h2:./db_dev;MODE=MySQL
     username: sa
     password:
     driver-class-name: org.h2.Driver