Dislocker/temp/csv_test.py

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2024-07-07 15:02:11 +09:00
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)