feat: 기이수성적 데이터 추가 시, batch insert 적용

src/main/java/com/example/gimmegonghakauth/dao/CompletedCoursesDao.java

@@ -7,6 +7,8 @@
 import org.springframework.stereotype.Repository;
 
 @Repository
-public interface CompletedCoursesDao extends JpaRepository<CompletedCoursesDomain, Long> {
+public interface CompletedCoursesDao
+    extends JpaRepository<CompletedCoursesDomain, Long>, CustomCompletedCoursesDao {
+
     List<CompletedCoursesDomain> findByUserDomain(UserDomain userDomain);
 }

src/main/java/com/example/gimmegonghakauth/dao/CustomCompletedCoursesDao.java

@@ -0,0 +1,11 @@
+package com.example.gimmegonghakauth.dao;
+
+import com.example.gimmegonghakauth.domain.CompletedCoursesDomain;
+import java.util.List;
+import org.springframework.transaction.annotation.Transactional;
+
+public interface CustomCompletedCoursesDao {
+
+    @Transactional
+    void saveAll(List<CompletedCoursesDomain> completedCourses);
+}

src/main/java/com/example/gimmegonghakauth/dao/CustomCompletedCoursesDaoImpl.java

@@ -0,0 +1,38 @@
+package com.example.gimmegonghakauth.dao;
+
+import com.example.gimmegonghakauth.domain.CompletedCoursesDomain;
+import java.sql.PreparedStatement;
+import java.sql.SQLException;
+import java.util.List;
+import lombok.RequiredArgsConstructor;
+import org.springframework.jdbc.core.BatchPreparedStatementSetter;
+import org.springframework.jdbc.core.JdbcTemplate;
+
+@RequiredArgsConstructor
+public class CustomCompletedCoursesDaoImpl implements CustomCompletedCoursesDao {
+
+    private final JdbcTemplate jdbcTemplate;
+
+    @Override
+    public void saveAll(List<CompletedCoursesDomain> completedCourses) {
+        String sql = "insert into completed_course (course_id, semester, user_id, year) values (?,?,?,?)";
+
+        jdbcTemplate.batchUpdate(
+            sql,
+            new BatchPreparedStatementSetter() {
+                @Override
+                public void setValues(PreparedStatement ps, int i) throws SQLException {
+                    CompletedCoursesDomain course = completedCourses.get(i);
+                    ps.setLong(1, course.getCoursesDomain().getCourseId());
+                    ps.setString(2, course.getSemester());
+                    ps.setLong(3, course.getUserDomain().getId());
+                    ps.setInt(4, course.getYear());
+                }
+
+                @Override
+                public int getBatchSize() {
+                    return completedCourses.size();
+                }
+            });
+    }
+}

src/main/java/com/example/gimmegonghakauth/service/CompletedCoursesService.java

@@ -7,6 +7,10 @@
 import com.example.gimmegonghakauth.domain.CoursesDomain;
 import com.example.gimmegonghakauth.domain.UserDomain;
 import com.example.gimmegonghakauth.exception.FileException;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+import lombok.extern.slf4j.Slf4j;
 import org.apache.commons.io.FilenameUtils;
 import org.apache.poi.hssf.usermodel.HSSFWorkbook;
 import org.apache.poi.ss.usermodel.DataFormatter;
@@ -19,11 +23,8 @@
 import org.springframework.transaction.annotation.Transactional;
 import org.springframework.web.multipart.MultipartFile;
 
-import java.io.IOException;
-import java.util.ArrayList;
-import java.util.List;
-
 @Service
+@Slf4j
 public class CompletedCoursesService {
 
     private final CompletedCoursesDao completedCoursesDao;
@@ -70,34 +71,34 @@ public List<CompletedCoursesDomain> getExcelList(UserDetails userDetails) {
 
     @Transactional
     public void extractData(Sheet worksheet, DataFormatter dataFormatter, UserDomain userDomain) {
+        List<CompletedCoursesDomain> completedCoursesList = new ArrayList<>();  // 저장할 엔티티 리스트 생성
 
         for (int i = FIRST_ROW; i < worksheet.getPhysicalNumberOfRows(); i++) { //데이터 추출
             Row row = worksheet.getRow(i);
 
             String yearAsString = dataFormatter.formatCellValue(row.getCell(1));
-            int year = Integer.parseInt(yearAsString)%100;  //년도
+            int year = Integer.parseInt(yearAsString) % 100;  //년도
 
             String semester = dataFormatter.formatCellValue(row.getCell(2)); //학기
 
             String courseIdAsString = dataFormatter.formatCellValue(row.getCell(3));
             Long courseId = courseIdToLong(courseIdAsString); //학수번호
 
-            CoursesDomain coursesDomain = coursesDao.findByCourseId(
-                courseId);// 학수번호를 기반으로 Courses 테이블 검색
+            CoursesDomain coursesDomain = coursesDao.findByCourseId(courseId);// 학수번호를 기반으로 Courses 테이블 검색
             if (coursesDomain == null) {
                 continue;
             }
-            CompletedCoursesDomain data = CompletedCoursesDomain.builder().userDomain(userDomain)
-                .coursesDomain(coursesDomain)
-                .year(year)
-                .semester(semester)
-                .build();
-
-            completedCoursesDao.save(data);
+            CompletedCoursesDomain data = CompletedCoursesDomain.builder()
+                                                                .userDomain(userDomain)
+                                                                .coursesDomain(coursesDomain)
+                                                                .year(year)
+                                                                .semester(semester)
+                                                                .build();
+            completedCoursesList.add(data);  // 엔티티를 리스트에 추가
         }
+        completedCoursesDao.saveAll(completedCoursesList);  // 한 번에 전체 엔티티 저장
     }
 
-
     //업로드 파일 검증
     private void validateExcelFile(MultipartFile file, String extension) throws FileException {
         if (file.isEmpty()) { // 파일이 비어있으면
@@ -152,6 +153,4 @@ private Long courseIdToLong(String courseIdAsString) {
         }
         return Long.parseLong(courseIdAsString);
     }
-
-
 }