[FU-339] 상품 중복등록 방지를 위한 제약조건 추가 (#85)

* feat: Product 테이블 unique 제약조건 추가

product title, member_id를 결합해 제약조건으로 설정하였음

* feat: DataIntegrityViolationException 예외 처리

제약 조건을 위반(상품 제목 중복 등록 등)했을 경우 예외 처리하기 위함

src/main/java/com/foru/freebe/errors/handler/GlobalExceptionHandler.java

@@ -40,12 +40,16 @@ public ResponseEntity<Object> handleIllegalArgument(IllegalArgumentException e)
         return handleExceptionInternal(errorCode, e.getMessage());
     }
 
-    @ExceptionHandler(DataIntegrityViolationException.class)
+    @ExceptionHandler(DataTruncation.class)
     public ResponseEntity<Object> handleDataTruncation(DataTruncation e) {
         ErrorCode errorCode = CommonErrorCode.INVALID_PARAMETER;
-        String message = e.getMessage();
+        return handleExceptionInternal(errorCode, e.getMessage());
+    }
 
-        return handleExceptionInternal(errorCode, message);
+    @ExceptionHandler(DataIntegrityViolationException.class)
+    public ResponseEntity<Object> handleDataIntegrityViolation(DataIntegrityViolationException e) {
+        ErrorCode errorCode = CommonErrorCode.INTERNAL_SERVER_ERROR;
+        return handleExceptionInternal(errorCode, e.getMessage());
     }
 
     // 메서드 인자의 유효성 검사가 실패했을 때 발생

src/main/java/com/foru/freebe/product/entity/Product.java

@@ -21,6 +21,8 @@
 import jakarta.persistence.Id;
 import jakarta.persistence.JoinColumn;
 import jakarta.persistence.ManyToOne;
+import jakarta.persistence.Table;
+import jakarta.persistence.UniqueConstraint;
 import jakarta.validation.constraints.NotBlank;
 import jakarta.validation.constraints.NotNull;
 import lombok.AccessLevel;
@@ -31,6 +33,11 @@
 @Entity
 @Getter
 @NoArgsConstructor(access = AccessLevel.PROTECTED)
+@Table(
+    uniqueConstraints = @UniqueConstraint(
+        name = "unique_title",
+        columnNames = {"title", "member_id"})
+)
 public class Product extends BaseEntity {
     @Id
     @GeneratedValue(strategy = GenerationType.IDENTITY)