csv出力のテスト

temp/csv_test.py

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+import psycopg2
+import csv
+from psycopg2 import sql
+from datetime import datetime
+
+def format_datetime(value):
+    if isinstance(value, datetime):
+        return value.strftime('%Y-%m-%d %H:%M:%S')
+    return value
+
+def export_table_to_csv(host, port, database, user, password, main_table, related_table, related_column, csv_file_path):
+    try:
+        # データベースに接続
+        conn = psycopg2.connect(
+            host=host,
+            port=port,
+            database=database,
+            user=user,
+            password=password
+        )
+        
+        cur = conn.cursor()
+        
+        # メインテーブルの列情報を取得（user_idを除く）
+        cur.execute(sql.SQL("SELECT * FROM {} LIMIT 0").format(sql.Identifier(main_table)))
+        main_columns = [desc[0] for desc in cur.description if desc[0] != 'member_id']
+        
+        # クエリを作成（列名を明確に指定）
+        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=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)
+        )
+        
+        cur.execute(query)
+        
+        # 列名を再構成（nameを2番目に配置）
+        column_names = [main_columns[0], 'name'] + main_columns[1:]
+        
+        rows = cur.fetchall()
+        
+        with open(csv_file_path, 'w', newline='', encoding='utf-8-sig') as csvfile:
+            csvwriter = csv.writer(csvfile)
+            csvwriter.writerow(column_names)
+            
+            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]]
+                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。")
+        
+    except (Exception, psycopg2.Error) as error:
+        print("エラーが発生しました:", error)
+    
+    finally:
+        if conn:
+            cur.close()
+            conn.close()
+            print("データベース接続を閉じました。")
+
+# 使用例
+host = "192.168.1.220"
+port = "12245"
+database = "dislocker"
+user = "suti7"
+password = "Testing1234"
+main_table = "pc_usage_history"
+related_table = "club_member"
+related_column = "name"  # 例: 登録者の名前を表示したい場合
+csv_file_path = "output.csv"
+
+export_table_to_csv(host, port, database, user, password, main_table, related_table, related_column, csv_file_path)