init

app.py

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+from flask import Flask, render_template, request, redirect, url_for
+from flask_sqlalchemy import SQLAlchemy
+from sqlalchemy import select
+from sqlalchemy.orm import Mapped, mapped_column   
+from typing import Optional                        
+from pathlib import Path
+
+app = Flask(__name__)
+app.config.update(
+    SQLALCHEMY_DATABASE_URI='sqlite:///' + str(Path(__file__).with_name('database.db')),
+    SQLALCHEMY_TRACK_MODIFICATIONS=False,
+)
+
+db = SQLAlchemy(app)
+
+class Contact(db.Model):
+    __tablename__ = 'contacts'
+    id: Mapped[int] = mapped_column(db.Integer, primary_key=True, autoincrement=True)
+    name: Mapped[str] = mapped_column(db.String(255), nullable=False)
+    email: Mapped[Optional[str]] = mapped_column(db.String(255), nullable=True)
+    phone: Mapped[Optional[str]] = mapped_column(db.String(50), nullable=True)
+
+    def __repr__(self) -> str:
+        return f"<Contact id={self.id} name={self.name!r}>"
+
+# tworzymy tabelę przy starcie (w projekcie produkcyjnym użyj migracji)
+with app.app_context():
+    db.create_all()
+
+@app.get('/')
+def index():
+    rows = db.session.execute(select(Contact).order_by(Contact.id.desc())).scalars().all()
+    return render_template('index.html', contacts=rows)
+
+@app.get('/new')
+def new():
+    return render_template('form.html', contact=None)
+
+@app.post('/create')
+def create():
+    name = (request.form.get('name') or '').strip()
+    email = (request.form.get('email') or '').strip()
+    phone = (request.form.get('phone') or '').strip()
+    if not name:
+        return render_template('form.html', contact={'name': name, 'email': email, 'phone': phone}, error='Imię i nazwisko jest wymagane.')
+    c = Contact(name=name, email=email or None, phone=phone or None)
+    db.session.add(c)
+    db.session.commit()
+    return redirect(url_for('index'), code=303)
+
+@app.get('/edit/<int:cid>')
+def edit(cid: int):
+    row = db.session.get(Contact, cid)
+    if not row:
+        return ('Nie znaleziono kontaktu', 404)
+    return render_template('form.html', contact=row)
+
+@app.post('/update')
+def update():
+    try:
+        cid = int(request.form.get('id'))
+    except (TypeError, ValueError):
+        return ('Błędny identyfikator', 400)
+    row = db.session.get(Contact, cid)
+    if not row:
+        return ('Nie znaleziono kontaktu', 404)
+    name = (request.form.get('name') or '').strip()
+    email = (request.form.get('email') or '').strip()
+    phone = (request.form.get('phone') or '').strip()
+    if not name:
+        return render_template('form.html', contact={'id': cid, 'name': name, 'email': email, 'phone': phone}, error='Imię i nazwisko jest wymagane.')
+    row.name = name
+    row.email = email or None
+    row.phone = phone or None
+    db.session.commit()
+    return redirect(url_for('index'), code=303)
+
+@app.post('/delete')
+def delete():
+    try:
+        cid = int(request.form.get('id'))
+    except (TypeError, ValueError):
+        return ('Błędny identyfikator', 400)
+    row = db.session.get(Contact, cid)
+    if not row:
+        return ('Nie znaleziono kontaktu', 404)
+    db.session.delete(row)
+    db.session.commit()
+    return redirect(url_for('index'), code=303)
+
+if __name__ == '__main__':
+    app.run(debug=True)