fix: 오ㅠ수정

EduManager/src/main/java/controller/lecture/ViewLectureController.java

@@ -53,6 +53,8 @@ public String execute(HttpServletRequest request, HttpServletResponse response)
         boolean isConflict = lectureManager. isLectureConflict(stuId, lectureId); // 인스턴스를 통해 호출
         request.setAttribute("isConflict", isConflict);
 
+        int availableSeats = lectureManager.getAvailableSeatsByLectureId(lectureId);
+        request.setAttribute("availableSeats", availableSeats);
 
         // 로그인한 사용자 ID를 request에 저장
         request.setAttribute("userId", MemberSessionUtils.getLoginMemberId(request.getSession()));

EduManager/src/main/java/controller/studyGroup/ViewStudyGroupController.java

@@ -68,6 +68,9 @@ public String execute(HttpServletRequest request, HttpServletResponse response)
         System.out.println("요청 상태: "+ requestStatus);
         request.setAttribute("requestStatus", requestStatus);
 
+        int studyAvailableSeats = manager.getAvailableSeatsByStudyGroupId(groupId);
+        request.setAttribute("studyAvailableSeats",studyAvailableSeats);
+
         // 강의 상세 페이지로 이동
         return "/study/study_overview.jsp";
     }

EduManager/src/main/java/model/dao/lecture/LectureDao.java

@@ -627,5 +627,25 @@ public List<LocalDate> findMonthSchedule(int lectureId, int month, int year) {
       return null;
    }
 
+   public int getAvailableSeatsByLectureId(long lectureId) {
+       String sql = "SELECT (l.CAPACITY - COUNT(le.ENROLLMENTID)) AS AVAILABLE_SEATS " +
+                    "FROM LECTURE l " +
+                    "LEFT JOIN LECTUREENROLLMENT le ON l.LECTUREID = le.LECTUREID " +
+                    "WHERE l.LECTUREID = ? " +
+                    "GROUP BY l.CAPACITY";
+       jdbcUtil.setSqlAndParameters(sql, new Object[] { lectureId }); // SQL과 파라미터 설정
+       try {
+           ResultSet rs = jdbcUtil.executeQuery(); // 쿼리 실행
+           if (rs.next()) {
+               return rs.getInt("AVAILABLE_SEATS"); // 잔여 좌석 수 반환
+           }
+       } catch (Exception e) {
+           e.printStackTrace();
+       } finally {
+           jdbcUtil.close(); // 자원 해제
+       }
+       return -1; // 강의가 없거나 에러 발생 시 -1 반환
+   }
+
 }
 

EduManager/src/main/java/model/dao/studygroup/StudyGroupDao.java

@@ -741,4 +741,27 @@ WHEN EXISTS (
             jdbcUtil.close(); // 리소스 해제
         }
     }
+
+
+    public int getAvailableSeatsByStudyGroupId(long studyGroupId) {
+        String sql = "SELECT (sg.capacity - COUNT(sga.studygroupapplicationid)) AS available_seats " +
+                "FROM studygroup sg " +
+                "LEFT JOIN studygroupapplication sga " +
+                "ON sg.studygroupid = sga.studygroupid AND sga.status = '수락' " +
+                "WHERE sg.studygroupid = ? " +
+                "GROUP BY sg.capacity";
+        jdbcUtil.setSqlAndParameters(sql, new Object[] { studyGroupId }); // SQL과 파라미터 설정
+        try {
+            ResultSet rs = jdbcUtil.executeQuery(); // 쿼리 실행
+            if (rs.next()) {
+                return rs.getInt("available_seats"); // 잔여 좌석 수 반환
+            }
+        } catch (Exception e) {
+            e.printStackTrace();
+        } finally {
+            jdbcUtil.close(); // 자원 해제
+        }
+        return -1; // 스터디 그룹이 없거나 에러 발생 시 -1 반환
+    }
+
 }

EduManager/src/main/java/model/domain/lecture/LectureAvailability.java

@@ -0,0 +1,53 @@
+package model.domain.lecture;
+
+public class LectureAvailability {
+    private long lectureId; // 강의 ID
+    private String name;    // 강의 이름
+    private int availableSeats; // 잔여 좌석 수
+
+    // 기본 생성자
+    public LectureAvailability() {
+    }
+
+    // 매개변수 있는 생성자
+    public LectureAvailability(long lectureId, String name, int availableSeats) {
+        this.lectureId = lectureId;
+        this.name = name;
+        this.availableSeats = availableSeats;
+    }
+
+    // Getter 및 Setter
+    public long getLectureId() {
+        return lectureId;
+    }
+
+    public void setLectureId(long lectureId) {
+        this.lectureId = lectureId;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public int getAvailableSeats() {
+        return availableSeats;
+    }
+
+    public void setAvailableSeats(int availableSeats) {
+        this.availableSeats = availableSeats;
+    }
+
+    // toString 메서드 (디버깅 및 로깅 용도)
+    @Override
+    public String toString() {
+        return "LectureAvailability{" +
+                "lectureId=" + lectureId +
+                ", name='" + name + '\'' +
+                ", availableSeats=" + availableSeats +
+                '}';
+    }
+}

EduManager/src/main/java/model/domain/studyGroup/StudyGroupAvailability.java

@@ -0,0 +1,53 @@
+package model.domain.studyGroup;
+
+public class StudyGroupAvailability {
+    private long studyGroupId; // 강의 ID
+    private String name;    // 강의 이름
+    private int availableSeats; // 잔여 좌석 수
+
+    // 기본 생성자
+    public StudyGroupAvailability() {
+    }
+
+    // 매개변수 있는 생성자
+    public StudyGroupAvailability(long studyGroupId, String name, int availableSeats) {
+        this.studyGroupId = studyGroupId;
+        this.name = name;
+        this.availableSeats = availableSeats;
+    }
+
+    // Getter 및 Setter
+    public long getStudyGroupId() {
+        return studyGroupId;
+    }
+
+    public void setStudyGroupId(long studyGroupId) {
+        this.studyGroupId = studyGroupId;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public int getAvailableSeats() {
+        return availableSeats;
+    }
+
+    public void setAvailableSeats(int availableSeats) {
+        this.availableSeats = availableSeats;
+    }
+
+    // toString 메서드 (디버깅 및 로깅 용도)
+    @Override
+    public String toString() {
+        return "LectureAvailability{" +
+                "lectureId=" + studyGroupId +
+                ", name='" + name + '\'' +
+                ", availableSeats=" + availableSeats +
+                '}';
+    }
+}