From bb572f307243566cd088a94a8f603f0112b84980 Mon Sep 17 00:00:00 2001
From: mrutsy <mrutsy@zhs.one>
Date: Tue, 8 Apr 2025 09:17:16 +0000
Subject: [PATCH] =?UTF-8?q?=D0=94=D0=BE=D0=B1=D0=B0=D0=B2=D0=B8=D1=82?=
 =?UTF-8?q?=D1=8C=20app.py?=
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Случайно добавляет, изменяет или удаляет строку в базе данных.
---
 app.py | 121 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 121 insertions(+)
 create mode 100644 app.py

diff --git a/app.py b/app.py
new file mode 100644
index 0000000..5949dbd
--- /dev/null
+++ b/app.py
@@ -0,0 +1,121 @@
+import os
+import time
+import random
+import string
+import logging
+import psycopg2
+
+logging.basicConfig(level=logging.INFO, format='%(asctime)s - %(levelname)s - %(message)s')
+
+class Database:
+    def __init__(
+            self,
+            host=os.getenv('DB_HOST', 'localhost'),
+            port=os.getenv('DB_PORT', ''),
+            user=os.getenv('DB_USER', ''),
+            password=os.getenv('DB_PASSWORD', ''),
+            database=os.getenv('DB_DATABASE', ''),
+    ):
+        self.host = host
+        self.port = port
+        self.user = user
+        self.password = password
+        self.database = database
+        self.connection = None
+
+    def _open(self):
+        if self.connection is None:
+            try:
+                logging.debug("Пытаюсь установить соединение с базой данных.")
+                self.connection = psycopg2.connect(
+                    host=self.host,
+                    port=self.port,
+                    user=self.user,
+                    password=self.password,
+                    database=self.database,
+                    connect_timeout=5
+                )
+                logging.info(f"Соединение с базой данными {self.database} - установлено.")
+            except (Exception, psycopg2.Error) as e:
+                logging.error(f"Ошибка при подключении к базе данных: {e}")
+
+    def close(self):
+        if self.connection is not None:
+            self.connection.close()
+            logging.debug("Соединение с базой данных закрыто.")
+
+    def execute_query(self, query, params=None):
+        self._open()
+        try:
+            with self.connection.cursor() as cursor:
+                cursor.execute(query, params)
+                if query.strip().upper().startswith("SELECT"):
+                    result = cursor.fetchall()
+                    logging.debug(f"Выполнен запрос: {query} | Возвращено {len(result)} строк")
+                    return result
+                else:
+                    self.connection.commit()
+                    logging.debug(f"Выполнен запрос: {query}")
+        except Exception as e:
+            logging.error(f"Ошибка выполнения запроса:\n{e}")
+
+
+    def create_table(self, table_name, columns):
+        columns_with_types = ', '.join([f"{col} {typ}" for col, typ in columns.items()])
+        create_table_query = f"CREATE TABLE IF NOT EXISTS {table_name} ({columns_with_types});"
+        self.execute_query(create_table_query)
+
+    def insert_row(self, table_name, **kwargs):
+        columns = ', '.join(kwargs.keys())
+        placeholders = ', '.join(['%s'] * len(kwargs))
+        insert_query = f"INSERT INTO {table_name} ({columns}) VALUES ({placeholders});"
+        self.execute_query(insert_query, list(kwargs.values()))
+
+    def update_row(self, table_name, set_values, condition):
+        set_clause = ', '.join([f"{col} = %s" for col in set_values.keys()])
+        update_query = f"UPDATE {table_name} SET {set_clause} WHERE {condition};"
+        self.execute_query(update_query, list(set_values.values()))
+
+    def delete_row(self, table_name, condition):
+        delete_query = f"DELETE FROM {table_name} WHERE {condition};"
+        self.execute_query(delete_query)
+
+
+if __name__ == '__main__':
+    db = Database()
+    db.create_table(
+        'rows',
+        {
+            'id': 'SERIAL PRIMARY KEY',
+            'text': 'VARCHAR(255) NOT NULL',
+        }
+    )
+
+    for _ in range(5):
+        random_string = ''.join(random.choices(string.ascii_letters + string.digits, k=16))
+        db.insert_row('rows', text=random_string)
+        logging.info(f'Создана новая строка: {random_string}')
+
+    while True:
+        all_rows = db.execute_query('SELECT * FROM rows;')
+        random_string = ''.join(random.choices(string.ascii_letters + string.digits, k=16))
+
+        if all_rows:
+            action = random.choice(['insert', 'update', 'delete'])
+            random_row = random.choice(all_rows)
+
+            if action == 'insert':
+                db.insert_row('rows', text=random_string)
+                logging.info(f'Вставлена строка: {random_string}')
+
+            elif action == 'update':
+                db.update_row('rows', {'text': random_string}, f'id = {random_row[0]}')
+                logging.info(f'Обновлена строка с id {random_row[0]}: новый текст - {random_string}')
+
+            elif action == 'delete':
+                db.delete_row('rows', f'id = {random_row[0]}')
+                logging.info(f'Удалена строка с id {random_row[0]}')
+        else:
+            logging.warning("Нет строк для обработки.")
+
+        time.sleep(60)
\ No newline at end of file