Add auditing support and custom JPA naming strategy

Introduce auditing fields to track entity changes with `AuditFields` and enable auditing in `Application`. Add a custom JPA naming strategy for quoted snake_case formatting. Update `Member` entity and database schema to include audit fields.

Author: Ahn-JoonHun

spring-boot/src/main/java/com/mpc/springboot/Application.java

@@ -2,7 +2,9 @@
 
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.data.jpa.repository.config.EnableJpaAuditing;
 
+@EnableJpaAuditing
 @SpringBootApplication
 public class Application {
 

spring-boot/src/main/java/com/mpc/springboot/config/audit/SecurityAuditorAware.java

@@ -0,0 +1,15 @@
+package com.mpc.springboot.config.audit;
+
+import org.springframework.data.domain.AuditorAware;
+import org.springframework.stereotype.Component;
+
+import java.util.Optional;
+
+@Component
+public class SecurityAuditorAware implements AuditorAware<String> {
+
+    @Override
+    public Optional<String> getCurrentAuditor() {
+        return Optional.of("test-member");
+    }
+}

spring-boot/src/main/java/com/mpc/springboot/config/persistence/jpa/QuotedCamelCaseToUnderScoresNamingStrategy.java

@@ -0,0 +1,26 @@
+package com.mpc.springboot.config.persistence.jpa;
+
+import org.hibernate.boot.model.naming.CamelCaseToUnderscoresNamingStrategy;
+import org.hibernate.boot.model.naming.Identifier;
+import org.hibernate.engine.jdbc.env.spi.JdbcEnvironment;
+
+public class QuotedCamelCaseToUnderScoresNamingStrategy extends CamelCaseToUnderscoresNamingStrategy {
+
+    @Override
+    public Identifier toPhysicalColumnName(Identifier name, JdbcEnvironment jdbcEnvironment) {
+        if (name == null) {
+            return null;
+        }
+        Identifier snakeCaseIdentifier = super.toPhysicalColumnName(name, jdbcEnvironment);
+        return Identifier.toIdentifier("`" + snakeCaseIdentifier.getText() + "`", snakeCaseIdentifier.isQuoted());
+    }
+
+    @Override
+    public Identifier toPhysicalTableName(Identifier name, JdbcEnvironment jdbcEnvironment) {
+        if (name == null) {
+            return null;
+        }
+        Identifier snakeCaseIdentifier = super.toPhysicalTableName(name, jdbcEnvironment);
+        return Identifier.toIdentifier("`" + snakeCaseIdentifier.getText() + "`", snakeCaseIdentifier.isQuoted());
+    }
+}

spring-boot/src/main/java/com/mpc/springboot/member/application/service/MemberService.java

@@ -1,5 +1,7 @@
 package com.mpc.springboot.member.application.service;
 
+import jakarta.transaction.Transactional;
+
 import org.springframework.stereotype.Service;
 import com.mpc.springboot.member.domain.entity.Member;
 import com.mpc.springboot.member.domain.exception.MemberNotFoundException;
@@ -18,6 +20,7 @@ public Member getMemberBy(MemberCode code) {
                 .orElseThrow(MemberNotFoundException::new);
     }
 
+    @Transactional
     public Member createMember(Member member) {
         return memberRepository.save(member);
     }

spring-boot/src/main/java/com/mpc/springboot/member/domain/entity/Member.java

@@ -2,13 +2,16 @@
 
 import jakarta.persistence.*;
 
+import org.springframework.data.jpa.domain.support.AuditingEntityListener;
 import com.mpc.springboot.member.domain.vo.MemberCode;
 import com.mpc.springboot.member.domain.mapping.MemberCodeConverter;
 import com.mpc.springboot.member.domain.vo.MemberName;
+import com.mpc.springboot.shared.domain.AuditFields;
 import lombok.*;
 
 @Getter
-@NoArgsConstructor
+@EntityListeners(AuditingEntityListener.class)
+@NoArgsConstructor(access = AccessLevel.PROTECTED)
 @Entity
 public class Member {
 
@@ -22,10 +25,8 @@ public class Member {
     @Embedded
     private MemberName name;
 
-    public Member(MemberCode code, MemberName name) {
-        this.code = code;
-        this.name = name;
-    }
+    @Embedded
+    private AuditFields auditFields = new AuditFields();
 }
 
 

spring-boot/src/main/java/com/mpc/springboot/member/infrastructure/persistence/jpa/repository/MemberJpaRepository.java

@@ -3,10 +3,12 @@
 import java.util.Optional;
 
 import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
 import com.mpc.springboot.member.domain.entity.Member;
 import com.mpc.springboot.member.domain.vo.MemberCode;
 
-public interface MemberJpaRepository extends JpaRepository<Member, Long> {
+@Repository
+public interface MemberJpaRepository extends JpaRepository<Member, Integer> {
 
     Optional<Member> findByCode(MemberCode code);
 }

spring-boot/src/main/java/com/mpc/springboot/shared/domain/AuditFields.java

@@ -0,0 +1,34 @@
+package com.mpc.springboot.shared.domain;
+
+import jakarta.persistence.Column;
+import jakarta.persistence.Embeddable;
+
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import org.springframework.data.annotation.CreatedBy;
+import org.springframework.data.annotation.LastModifiedBy;
+import org.springframework.data.annotation.CreatedDate;
+import org.springframework.data.annotation.LastModifiedDate;
+
+
+import java.time.LocalDateTime;
+
+@Getter
+@NoArgsConstructor
+@Embeddable
+public class AuditFields {
+
+    @CreatedBy
+    @Column(updatable = false)
+    private String createdBy;
+
+    @CreatedDate
+    @Column(updatable = false)
+    private LocalDateTime createdDateTime;
+
+    @LastModifiedBy
+    private String lastModifiedBy;
+
+    @LastModifiedDate
+    private LocalDateTime lastModifiedDateTime;
+}

spring-boot/src/main/resources/application.yml

@@ -9,6 +9,8 @@ spring:
     database: mysql
     hibernate:
       ddl-auto: validate
+      naming:
+        physical-strategy: com.mpc.springboot.config.persistence.jpa.QuotedCamelCaseToUnderScoresNamingStrategy
     show-sql: true
     properties:
       hibernate.format_sql: true

spring-boot/src/main/resources/db/migration/V3__add_audit_fields.sql

@@ -0,0 +1,4 @@
+alter table member add column created_by varchar(320);
+alter table member add column last_modified_by varchar(320);
+alter table member add column created_date_time timestamp;
+alter table member add column last_modified_date_time timestamp;