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init: Flask CRUD app v1.0.0 — same design as Lucee, PG params, CREATE IF NOT EXISTS

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naeel
2026-07-20 10:46:20 +04:00
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.gitignore
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__pycache__/
*.pyc
*.pyo
.venv/
venv/
.env
*.egg-info/
dist/
*.log
.DS_Store
.idea/
.vscode/
app.py
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"""
app.py — Flask CRUD-интерфейс для PostgreSQL.
Переменные окружения (из json_env):
- PGHOST, PGPORT, PGDATABASE, PGUSER, PGPASSWORD — подключение к БД
- TABLE_NAME — имя таблицы (по умолчанию crud_items)
При старте: CREATE TABLE IF NOT EXISTS (БЕЗ DROP).
"""
import os
import psycopg2
import psycopg2.extras
from flask import Flask, render_template, request, redirect, url_for, g
VERSION = "1.0.0"
TABLE_NAME = os.environ.get("TABLE_NAME", "crud_items")
app = Flask(__name__)
def get_db():
"""Ленивое подключение к PostgreSQL. Один коннект на запрос."""
if "db" not in g:
g.db = psycopg2.connect(
host=os.environ.get("PGHOST", "127.0.0.1"),
port=os.environ.get("PGPORT", "5432"),
dbname=os.environ.get("PGDATABASE", "postgres"),
user=os.environ.get("PGUSER", "postgres"),
password=os.environ.get("PGPASSWORD", ""),
)
g.db.autocommit = True
return g.db
def init_db():
"""CREATE TABLE IF NOT EXISTS — никогда не дропает существующую таблицу."""
db = get_db()
cur = db.cursor()
cur.execute(
f"""
CREATE TABLE IF NOT EXISTS {TABLE_NAME} (
id SERIAL PRIMARY KEY,
value TEXT NOT NULL DEFAULT ''
)
"""
)
cur.close()
@app.teardown_appcontext
def close_db(exc):
db = g.pop("db", None)
if db is not None:
db.close()
@app.route("/", methods=["GET", "POST"])
def index():
db = get_db()
cur = db.cursor(cursor_factory=psycopg2.extras.RealDictCursor)
# --- Обработка POST (create / update / delete) — POST-redirect-GET ---
if request.method == "POST":
action = request.form.get("action", "")
if action == "create":
cur.execute(
f"INSERT INTO {TABLE_NAME} (value) VALUES (%s)",
(request.form.get("value", ""),),
)
elif action == "update":
cur.execute(
f"UPDATE {TABLE_NAME} SET value = %s WHERE id = %s",
(request.form.get("value", ""), int(request.form.get("id", 0))),
)
elif action == "delete":
cur.execute(
f"DELETE FROM {TABLE_NAME} WHERE id = %s",
(int(request.form.get("id", 0)),),
)
cur.close()
return redirect(url_for("index"))
# --- GET: список + форма редактирования ---
edit_row = {}
edit_id = request.args.get("edit")
if edit_id:
cur.execute(
f"SELECT id, value FROM {TABLE_NAME} WHERE id = %s",
(int(edit_id),),
)
row = cur.fetchone()
if row:
edit_row = dict(row)
# Список всех записей
cur.execute(f"SELECT id, value FROM {TABLE_NAME} ORDER BY id")
rows = cur.fetchall()
cur.close()
return render_template(
"index.html",
table_name=TABLE_NAME,
rows=rows,
edit_row=edit_row,
version=VERSION,
)
if __name__ == "__main__":
init_db()
app.run(host="0.0.0.0", port=int(os.environ.get("PORT", 5000)), debug=False)
requirements.txt
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Flask>=3.0
psycopg2-binary>=2.9
gunicorn>=21.2
static/favicon.svg
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static/logo.svg
Executable
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static/style.css
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:root {
--brand-primary: #2563eb;
--brand-primary-dark: #1d4ed8;
--brand-gray: #d1d5db;
--brand-grey-light: #f3f4f6;
--brand-destructive: #ef4444;
--brand-success: #22c55e;
--text-primary: #1a1a1a;
--text-muted: #6b7280;
--bg-card: #ffffff;
--radius: 12px;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
font-family: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
font-size: 14px;
color: var(--text-primary);
background: var(--brand-grey-light);
min-height: 100vh;
padding: 40px 16px;
}
.container { max-width: 720px; margin: 0 auto; }
/* Header */
.header {
display: flex; align-items: center; gap: 12px;
margin-bottom: 24px;
}
.header img { height: 36px; }
.header h1 { font-size: 20px; font-weight: 600; color: #001C34; }
/* Card */
.card {
background: var(--bg-card);
border-radius: var(--radius);
border: 1px solid var(--brand-gray);
box-shadow: 0 1px 2px rgba(0,0,0,0.05);
overflow: hidden;
margin-bottom: 20px;
}
.card-header {
background: var(--brand-grey-light);
padding: 12px 16px;
font-weight: 600;
font-size: 16px;
}
.card-body { padding: 16px; }
/* Table */
table { width: 100%; border-collapse: collapse; }
th {
background: var(--brand-grey-light);
text-transform: uppercase;
font-size: 12px;
font-weight: 600;
color: var(--text-muted);
padding: 8px 12px;
text-align: left;
border-right: 1px solid var(--brand-gray);
}
th:last-child { border-right: none; text-align: center; width: 60px; }
td {
padding: 8px 12px;
border-bottom: 1px solid var(--brand-gray);
border-right: 1px solid var(--brand-gray);
}
td:last-child { border-right: none; text-align: center; width: 60px; }
tr:hover { background: rgba(243,244,246,0.5); }
tr:last-child td { border-bottom: none; }
/* Buttons */
.btn {
display: inline-flex; align-items: center; gap: 4px;
height: 32px; padding: 0 12px;
border: 1px solid var(--brand-gray);
border-radius: 6px;
background: var(--bg-card);
font-size: 14px; font-family: inherit;
cursor: pointer; white-space: nowrap;
text-decoration: none;
color: var(--text-primary);
}
.btn:hover { background: var(--brand-grey-light); }
.btn-primary {
background: var(--brand-primary); color: #fff; border-color: var(--brand-primary);
}
.btn-primary:hover { background: var(--brand-primary-dark); }
.btn-sm { height: 28px; padding: 0 8px; font-size: 13px; }
/* Form */
.form-grid {
display: grid;
grid-template-columns: 1fr;
gap: 12px;
}
.form-row {
display: flex; gap: 8px; align-items: flex-end;
}
.form-row input { flex: 1; }
input[type="text"] {
height: 36px; padding: 0 12px;
border: 1px solid var(--brand-gray);
border-radius: 6px; font-size: 14px; font-family: inherit;
}
input[type="text"]:focus { outline: none; border-color: var(--brand-primary); box-shadow: 0 0 0 2px rgba(37,99,235,0.15); }
/* Footer */
.footer { text-align: center; padding: 16px; color: #9ca3af; font-size: 12px; }
/* Empty state */
.empty-cell { color: var(--text-muted); padding: 24px; text-align: center; }
templates/index.html
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<!---
index.html — CRUD-интерфейс для таблицы в PostgreSQL (Flask + Jinja2).
Логика:
1. Если POST-запрос с action — выполняем create/update/delete
и редиректим на GET (POST-redirect-GET паттерн)
2. Если GET-запрос с ?edit=ID — загружаем запись для редактирования
3. Всегда показываем список всех записей + форму добавления/редактирования
Безопасность:
- Параметризованные запросы (%s) в app.py → защита от SQL-инъекций
- redirect после POST → защита от повторной отправки формы
- Jinja2 автоэкранирование → XSS-защита
Переменные (из app.py):
- table_name — имя таблицы
- rows — список записей [(id, value), ...]
- edit_row — запись для редактирования {} или None
- version — версия приложения
--->
<!DOCTYPE html>
<html lang="ru">
<head>
<meta charset="UTF-8" />
<title>CRUD Flask Example — {{ table_name }}</title>
<link rel="icon" type="image/svg+xml" href="{{ url_for('static', filename='favicon.svg') }}" />
<link rel="stylesheet" href="{{ url_for('static', filename='style.css') }}" />
</head>
<body>
<div class="container">
<div class="header">
<img src="{{ url_for('static', filename='logo.svg') }}" alt="Nubes" />
<h1>CRUD Flask Example</h1>
</div>
<div class="card">
<div class="card-header">Записи</div>
<div class="card-body" style="padding: 0;">
<table>
<thead>
<tr>
<th>ID</th>
<th>VALUE</th>
<th style="text-align:center;"></th>
<th style="text-align:center;"></th>
</tr>
</thead>
<tbody>
{% for row in rows %}
<tr>
<td>{{ row.id }}</td>
<td>{{ row.value }}</td>
<td style="text-align:center;">
<a href="?edit={{ row.id }}" class="btn btn-sm">✏️</a>
</td>
<td style="text-align:center;">
<form method="post" style="display:inline">
<input type="hidden" name="action" value="delete" />
<input type="hidden" name="id" value="{{ row.id }}" />
<button type="submit" class="btn btn-sm" onclick="return confirm('Удалить {{ row.id }}?')">🗑️</button>
</form>
</td>
</tr>
{% endfor %}
</tbody>
</table>
{% if not rows %}
<div class="empty-cell">Нет записей. Создайте первую.</div>
{% endif %}
</div>
</div>
<div class="card">
{% if edit_row %}
<div class="card-header">Редактировать #{{ edit_row.id }}</div>
<div class="card-body">
<form method="post" class="form-grid">
<input type="hidden" name="action" value="update" />
<input type="hidden" name="id" value="{{ edit_row.id }}" />
<div class="form-row">
<input type="text" name="value" value="{{ edit_row.value }}" required placeholder="Значение" />
<button type="submit" class="btn btn-primary">Сохранить</button>
<a href="/" class="btn">Отмена</a>
</div>
</form>
</div>
{% else %}
<div class="card-header">Добавить</div>
<div class="card-body">
<form method="post" class="form-grid">
<input type="hidden" name="action" value="create" />
<div class="form-row">
<input type="text" name="value" placeholder="Значение" required />
<button type="submit" class="btn btn-primary">Добавить</button>
</div>
</form>
</div>
{% endif %}
</div>
</div>
<div class="footer">
v{{ version }} &mdash; {{ table_name }}
</div>
</body>
</html>