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‎python-flask-mysql-csv-report/app.py

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from flask import Flask
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app = Flask(__name__)

‎python-flask-mysql-csv-report/db.py

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from app import app
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from flaskext.mysql import MySQL
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mysql = MySQL()
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# MySQL configurations
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app.config['MYSQL_DATABASE_USER'] = 'root'
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app.config['MYSQL_DATABASE_PASSWORD'] = 'root'
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app.config['MYSQL_DATABASE_DB'] = 'roytuts'
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app.config['MYSQL_DATABASE_HOST'] = 'localhost'
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mysql.init_app(app)

‎python-flask-mysql-csv-report/employee.sql

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-- --------------------------------------------------------
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-- Host: 127.0.0.1
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-- Server version: 8.0.17 - MySQL Community Server - GPL
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-- Server OS: Win64
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-- HeidiSQL Version: 10.2.0.5599
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-- --------------------------------------------------------
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/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;
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/*!40101 SET NAMES utf8 */;
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/*!50503 SET NAMES utf8mb4 */;
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/*!40014 SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0 */;
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/*!40101 SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='NO_AUTO_VALUE_ON_ZERO' */;
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-- Dumping database structure for roytuts
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DROP DATABASE IF EXISTS `roytuts`;
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CREATE DATABASE IF NOT EXISTS `roytuts` /*!40100 DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci */ /*!80016 DEFAULT ENCRYPTION='N' */;
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USE `roytuts`;
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-- Dumping structure for table roytuts.employee
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DROP TABLE IF EXISTS `employee`;
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CREATE TABLE IF NOT EXISTS `employee` (
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`emp_id` int(10) unsigned NOT NULL AUTO_INCREMENT,
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`emp_first_name` varchar(30) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NOT NULL,
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`emp_last_name` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NOT NULL,
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`emp_mgr_id` int(11) DEFAULT NULL,
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`emp_designation` varchar(30) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci DEFAULT NULL,
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PRIMARY KEY (`emp_id`)
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) ENGINE=InnoDB AUTO_INCREMENT=7975 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
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-- Dumping data for table roytuts.employee: ~16 rows (approximately)
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/*!40000 ALTER TABLE `employee` DISABLE KEYS */;
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INSERT INTO `employee` (`emp_id`, `emp_first_name`, `emp_last_name`, `emp_mgr_id`, `emp_designation`) VALUES
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(7369, 'SMITH', 'JHON', 7902, 'CLERK'),
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(7499, 'ALLEN', 'BORDER', 7698, 'SALESMAN'),
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(7521, 'WARD', 'SPACE', 7698, 'SALESMAN'),
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(7654, 'MARTIN', 'FOWLER', 7698, 'SALESMAN'),
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(7698, 'BLAKE', 'RAY', NULL, 'MANAGER'),
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(7782, 'CLARK', 'MICHAEL', NULL, 'MANAGER'),
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(7788, 'SCOTT', 'TIGER', 7566, 'ANALYST'),
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(7839, 'KING', 'ROY', NULL, 'VICE PRESIDENT'),
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(7844, 'TURNER', 'RICK', 7698, 'SALESMAN'),
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(7876, 'ADAMS', 'EVE', 7788, 'CLERK'),
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(7900, 'JAMES', 'BOND', 7698, 'CLERK'),
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(7902, 'FORD', 'LAMBDA', 7566, 'ANALYST'),
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(7934, 'MILLER', 'JOHN', 7782, 'CLERK'),
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(7954, 'FRANK', 'JOHN', 7782, 'MANAGER'),
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(7964, 'MARTIN', 'HIKMAN', NULL, 'CLERK'),
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(7974, 'APRIL', 'HICKMAN', 7782, 'SALESMAN');
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/*!40000 ALTER TABLE `employee` ENABLE KEYS */;
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/*!40101 SET SQL_MODE=IFNULL(@OLD_SQL_MODE, '') */;
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/*!40014 SET FOREIGN_KEY_CHECKS=IF(@OLD_FOREIGN_KEY_CHECKS IS NULL, 1, @OLD_FOREIGN_KEY_CHECKS) */;
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/*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */;

‎python-flask-mysql-csv-report/employee_report.csv

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"Emp Id, Emp First Name, Emp Last Name, Emp Designation"
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"7369,SMITH,JHON,CLERK"
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"7499,ALLEN,BORDER,SALESMAN"
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"7521,WARD,SPACE,SALESMAN"
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"7654,MARTIN,FOWLER,SALESMAN"
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"7698,BLAKE,RAY,MANAGER"
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"7782,CLARK,MICHAEL,MANAGER"
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"7788,SCOTT,TIGER,ANALYST"
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"7839,KING,ROY,VICE PRESIDENT"
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"7844,TURNER,RICK,SALESMAN"
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"7876,ADAMS,EVE,CLERK"
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"7900,JAMES,BOND,CLERK"
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"7902,FORD,LAMBDA,ANALYST"
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"7934,MILLER,JOHN,CLERK"
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"7954,FRANK,JOHN,MANAGER"
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"7964,MARTIN,HIKMAN,CLERK"
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"7974,APRIL,HICKMAN,SALESMAN"

‎python-flask-mysql-csv-report/main.py

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import io
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import csv
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import pymysql
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from app import app
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from db import mysql
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from flask import Flask, Response, render_template
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@app.route('/')
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def download():
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return render_template('download.html')
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@app.route('/download/report/csv')
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def download_report():
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conn = None
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cursor = None
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try:
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conn = mysql.connect()
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cursor = conn.cursor(pymysql.cursors.DictCursor)
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cursor.execute("SELECT emp_id, emp_first_name, emp_last_name, emp_designation FROM employee")
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result = cursor.fetchall()
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output = io.StringIO()
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writer = csv.writer(output)
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line = ['Emp Id, Emp First Name, Emp Last Name, Emp Designation']
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writer.writerow(line)
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for row in result:
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line = [str(row['emp_id']) + ',' + row['emp_first_name'] + ',' + row['emp_last_name'] + ',' + row['emp_designation']]
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writer.writerow(line)
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output.seek(0)
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return Response(output, mimetype="text/csv", headers={"Content-Disposition":"attachment;filename=employee_report.csv"})
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except Exception as e:
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print(e)
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finally:
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cursor.close()
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conn.close()
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if __name__ == "__main__":
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app.run()

‎python-flask-mysql-csv-report/readme.rst

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You can go through the tutorial https://www.roytuts.com/generate-csv-report-from-mysql-database-using-python-flask/

‎python-flask-mysql-csv-report/templates/download.html

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<!doctype html>
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<title>Python Flask File Generate CSV Report from MySQL</title>
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<h2>Generate CSV Report from MySQL</h2>
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<p>
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<a href="{{ url_for('.download_report') }}">Generate CSV Report</a>
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</p>

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