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BE/app.py

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+from flask import Flask, jsonify, request
+from flask_cors import CORS
+import psycopg2
+from psycopg2.extras import RealDictCursor
+from datetime import datetime
+from contextlib import contextmanager
+
+app = Flask(__name__)
+CORS(app)
+
+# PostgreSQL 설정
+DB_CONFIG = {
+    'host': 'localhost',
+    'port': 5432,
+    'database': 'root',
+    'user': 'root',
+    'password': '1q2w3e'
+}
+
+@contextmanager
+def get_db_connection():
+    conn = psycopg2.connect(**DB_CONFIG)
+    try:
+        yield conn
+    finally:
+        conn.close()
+
+@app.route('/', methods=['GET'])
+def get_access_records():
+    try:
+        with get_db_connection() as conn:
+            cur = conn.cursor(cursor_factory=RealDictCursor)
+
+            page = request.args.get('page', 1, type=int)
+            per_page = request.args.get('per_page', 100, type=int)
+            offset = (page - 1) * per_page
+
+            cur.execute("""
+                SELECT 
+                    s.student_id as id,
+                    SUBSTRING(s.class FROM 1 FOR 1) as grade,
+                    SUBSTRING(s.class FROM 3) as "classNo",
+                    s.name,
+                    TO_CHAR(COALESCE(ar.exit_time, ar.entry_time), 'YYYY-MM-DD') as date,
+                    TO_CHAR(COALESCE(ar.exit_time, ar.entry_time), 'HH24:MI:SS') as time,
+                    CASE 
+                        WHEN ar.type = 'entry' THEN '입실'
+                        WHEN ar.type = 'exit' THEN '퇴실'
+                        ELSE ar.type
+                    END as records,
+                    COALESCE(CAST(ar.device_id AS TEXT), '알 수 없음') as device
+                FROM access_records ar
+                JOIN students s ON ar.student_id = s.student_id
+                ORDER BY COALESCE(ar.exit_time, ar.entry_time) DESC
+                LIMIT %s OFFSET %s
+            """, (per_page, offset))
+
+            records = cur.fetchall()
+            return jsonify(records)
+    except Exception as e:
+        print(f"DB 오류: {e}")
+        return jsonify({"error": str(e)}), 500
+
+@app.route('/register', methods=['POST'])
+def register_student():
+    try:
+        data = request.form
+        grade = data['grade']
+        classNo = data['classNo']
+        number = data['number']
+        name = data['name']
+        finger_id = data['fingerPrintId']
+
+        student_id = f"S{datetime.now().year}{grade}{classNo}{number}"
+        student_class = f"{grade}{classNo}"  # class 컬럼용
+
+        with get_db_connection() as conn:
+            cur = conn.cursor()
+            cur.execute("""
+                INSERT INTO students(student_id, name, class, fingerprint_id)
+                VALUES (%s, %s, %s, %s)
+            """, (student_id, name, student_class, finger_id))
+            conn.commit()
+
+        return jsonify({"success": True, "student_id": student_id})
+
+    except psycopg2.errors.UniqueViolation:
+        return jsonify({"success": False, "error": "이미 등록된 학생입니다."}), 400
+    except Exception as e:
+        print(f"DB 오류: {e}")
+        return jsonify({"success": False, "error": str(e)}), 500
+
+if __name__ == '__main__':
+    app.run(host='0.0.0.0', port=5000, debug=True)