diff --git a/dislocker.py b/dislocker.py
index e11da35..0181355 100644
--- a/dislocker.py
+++ b/dislocker.py
@@ -2,6 +2,7 @@ import json
 import discord
 import os
 import psycopg2
+from psycopg2 import sql
 import hashlib
 import string
 import random
@@ -198,23 +199,24 @@ class Bot(discord.Client):
 
     def report_export(self, **kwargs):
         try:
+            cursor = dislocker.db.cursor()
             csv_file_path = self.export_dir_path + "pc_usage_history.csv"
             main_table = "pc_usage_history"
             related_table = "club_member"
-            cursor = dislocker.db.cursor()
+        
             # メインテーブルの列情報を取得（user_idを除く）
-            cursor.execute(psycopg2.sql.SQL("SELECT * FROM {} LIMIT 0").format(psycopg2.sql.Identifier(main_table)))
+            cursor.execute(sql.SQL("SELECT * FROM {} LIMIT 0").format(sql.Identifier(main_table)))
             main_columns = [desc[0] for desc in cursor.description if desc[0] != 'member_id']
             
             # クエリを作成（列名を明確に指定）
-            query = psycopg2.sql.SQL("""
+            query = sql.SQL("""
                 SELECT {main_columns}, {related_table}.name
                 FROM {main_table}
                 LEFT JOIN {related_table} ON {main_table}.member_id = {related_table}.id
             """).format(
-                main_columns=psycopg2.sql.SQL(', ').join([psycopg2.sql.SQL("{}.{}").format(psycopg2.sql.Identifier(main_table), psycopg2.sql.Identifier(col)) for col in main_columns]),
-                main_table=psycopg2.sql.Identifier(main_table),
-                related_table=psycopg2.sql.Identifier(related_table)
+                main_columns=sql.SQL(', ').join([sql.SQL("{}.{}").format(sql.Identifier(main_table), sql.Identifier(col)) for col in main_columns]),
+                main_table=sql.Identifier(main_table),
+                related_table=sql.Identifier(related_table)
             )
             
             cursor.execute(query)
@@ -230,9 +232,9 @@ class Bot(discord.Client):
                 
                 for row in rows:
                     # nameを2番目に移動
-                    formatted_row = [format_datetime(row[0])] + [row[-1]] + [format_datetime(field) if field is not None else '' for field in row[1:-1]]
+                    formatted_row = [self.format_datetime(row[0])] + [row[-1]] + [self.format_datetime(field) if field is not None else '' for field in row[1:-1]]
                     csvwriter.writerow(formatted_row)
-            
+
             print(f"テーブル '{main_table}' の内容を '{csv_file_path}' に出力しました。")
             result = {"result": "ok", "file_path": csv_file_path}