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‎PersonDB.sql

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DROP DATABASE IF EXISTS PersonDB;
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CREATE DATABASE IF NOT EXISTS PersonDB
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CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci;
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USE PersonDB;
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DROP TABLE IF EXISTS PersonList;
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CREATE TABLE IF NOT EXISTS PersonList(
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id INT PRIMARY KEY AUTO_INCREMENT,
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lastname VARCHAR(24) NOT NULL,
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firstname VARCHAR(24) NOT NULL,
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UNIQUE (firstname,lastname),
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gender CHAR(1) NOT NULL DEFAULT 'm',
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h INT NOT NULL DEFAULT 160,
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age INT NOT NULL DEFAULT 24,
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CONSTRAINT chk_gender CHECK (gender IN ('m', 'f')),
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CONSTRAINT chk_age CHECK (age>=17 AND age<=70),
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CONSTRAINT chk_h CHECK(h>=155 AND h<=220)
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) ENGINE=InnoDB;
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INSERT INTO PersonList(firstname, lastname, gender, age, h) VALUES
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('Biagio Rosario', 'Greco', 'm', 40, 171),
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('Vincenzo', 'Ravaglioli', 'm', 34, 165),
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('Torquato', 'Camilleri', 'm', 21, 162),
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('Alberico', 'Vianello', 'm', 19, 176),
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('Arnaldo', 'Bianchi', 'm', 45, 164),
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('Antonio', 'Oliva', 'm', 43, 179),
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('Beatrice', 'Petrella', 'f', 52, 170),
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('Adelasia', 'Solari', 'f', 31, 179),
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('Marta', 'Bignardi', 'f', 39, 160),
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('Daria', 'Battimelli', 'f', 41, 165),
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('Fiamma', 'Scala', 'f', 21, 168),
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('Donatella', 'Rossi', 'f', 37, 196),
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('Daria', 'Tuzzolino', 'f', 52, 174),
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('Matilda', 'Catapano', 'f', 19, 199),
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('Edoardo', 'Tognazzi', 'm', 54, 184),
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('Stefano', 'Da Re', 'm', 22, 192),
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('Gemma', 'Cortese', 'f', 34, 184),
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('Bruno', 'Fusani', 'm', 34, 174),
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('Liana', 'Surian', 'f', 54, 191),
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('Amalia', 'Baresi', 'f', 42, 183),
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('Patrizio', 'Saraceno', 'm', 53, 163);

‎flaskstart.bat

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@echo off
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REM file: flaskstart.bat
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cd %~dp0
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CLS
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REM *** Envairoment VAR SETTING ***
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REM app is file: 'webapp.py'. this file contains routing
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set FLASK_APP=webapp
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REM development mode (print PIN for edit with python on browser)
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set FLASK_ENV=development
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REM Host address setting
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set FLASK_RUN_HOST=localhost
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REM PORT setting
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set FLASK_RUN_PORT=8000
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REM Start web page (with Vivaldi Browser) after lauch this file
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"C:\Program Files\Vivaldi\Application\vivaldi.exe" "http://%FLASK_RUN_HOST%:%FLASK_RUN_PORT%"
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CLS
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REM start FLASK
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flask run --port=%FLASK_RUN_PORT%
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REM in alternative try to run
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REM python "%FLASK_APP%.py"

‎mysql_config.json

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{
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"host": "localhost",
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"port": 3306,
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"user": "root",
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"password": "",
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"db": "PersonDB"
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}

‎templates/mainView.html

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{# Main View Page #}
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<!doctype html>
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<html lang="it">
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<head>
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<meta charset="utf-8" />
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<meta name="viewport" content="width=device-width, shrink-to-fit=no, user-scalable=yes, initial-scale=1.0, maximum-scale=4.0, minimum-scale=0.5" />
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<link
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type="image/png"
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rel="icon"
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href="https://emojipedia-us.s3.dualstack.us-west-1.amazonaws.com/thumbs/60/joypixels/291/rocket_1f680.png"
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/>
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<title>{{titolo}}</title>
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<link
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rel="stylesheet"
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href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css"
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integrity="sha384-0evHe/X+R7YkIZDRvuzKMRqM+OrBnVFBL6DOitfPri4tjfHxaWutUpFmBp4vmVor"
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crossorigin="anonymous"
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/>
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{% block headOfPage %}
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{% endblock headOfPage %}
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</head>
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<body>
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{% block bodyOfPage %}
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{% endblock bodyOfPage %}
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</body>
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</html>

‎templates/showQuery.html

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{# Show Query #}
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{% extends 'mainView.html' %}
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{% block headOfPage %}
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<script async>
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const deletePerson = async (id) => {
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const affected = (confirm(`Delete {{sql_fields[0]}}: ${id}?`))
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? await fetch(
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`./api/${id}`, {
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method: 'DELETE'
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}
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).then(
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response => response.json()
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).then(
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j => parseInt(j.affected_rows)
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)
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: 0;
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if(affected === 0)
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alert('Problema Eliminazione');
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else
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location.reload();
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}
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</script>
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{% endblock headOfPage %}
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{% block bodyOfPage %}
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<table class="table table-striped">
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<thead class="table-dark">
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<tr>
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<td>&#x1f6e0;</td>
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{% for cell in sql_fields[1:] %}
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<th scope="col">{{ cell }}</th>
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{% endfor %}
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</tr>
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</thead class="table-warring">
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<form>
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<tr>
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<td>
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<input type="submit" value="&#x2714;" class="btn btn-outline-success" />
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</td>
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{% for cell in sql_fields[1:] %}
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<th scope="col">
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<input
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type="text"
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name="{{cell}}"
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required
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class="form-control"
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placeholder="insert {{cell}}"
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/>
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</th>
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{% endfor %}
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</tr>
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</form>
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<thead>
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<tbody>
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{% for row in sql_tab %}
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<tr>
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<th>
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<input
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type="button"
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onclick="javascript:deletePerson({{row[0]}})"
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class="btn btn-outline-danger"
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value="&#x274c;"
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/>
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</th>
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{% for cell in row[1:] %}
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<td>{{ cell }}</td>
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{% endfor %}
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</tr>
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{% endfor %}
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</tbody>
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</table>
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{% endblock bodyOfPage %}

‎webapp.py

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from flask import Flask, render_template, request
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from flask_mysqldb import MySQL
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import json
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app = Flask(__name__)
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'''
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Load from json file the configuration for MySQL R-DBMS data
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'''
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for prop, val in json.load(open('mysql_config.json')).items():
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app.config[f'''MYSQL_{prop.upper()}'''] = val
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mysql = MySQL(app)
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'''
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execute the query and return Result-Set
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'''
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def findPersons(fields):
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_q = f'''
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SELECT
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{', '.join(fields)}
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FROM
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PersonList
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WHERE
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1
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ORDER BY
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h ASC;
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'''
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_cur = mysql.connection.cursor()
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_num_rows = _cur.execute(_q)
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_rs = _cur.fetchall()
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_cur.close()
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return _rs
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'''
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NB: the temlate files must be into ./templates dir
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'''
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@app.route('/')
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def home():
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fields = (
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'id',
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'firstname',
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'lastname',
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'gender',
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'h',
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'age'
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)
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return render_template(
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'showQuery.html',
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titolo='Show Person List',
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sql_tab=findPersons(fields),
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sql_fields=fields
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)
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@app.route('/api/<int:id>', methods=['DELETE','GET'])
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def deletePerson(id):
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#_id = request.values.get('id', default=-1, type=int)
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_q = f'''DELETE FROM PersonList WHERE id={id};'''
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_cur = mysql.connection.cursor()
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_affected_rows = _cur.execute(_q)
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mysql.connection.commit()
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_cur.close()
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return app.response_class(
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status=200,
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mimetype='application/json',
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response = json.dumps( { 'affected_rows' : _affected_rows } )
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)
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if __name__ == '__main__':
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app.run(debug=True)
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'''
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app.run(
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debug=True,
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host='localhost'
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port=8000
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)
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'''

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