data.csv

10000000001;Daniel Hilbrand;1
10000000002;Korbinian Gabler;2
10000000003;Felix Schaidnagel;3
10000000004;Simon Vogler;4

KartenLeserText.py

from urllib.request import pathname2url
import os.path
import sqlite3 
import csv

db = r'karten.db'
con = sqlite3.connect(db)
cur = con.cursor()

def CheckDatabase():
    global cur
    cur.execute("SELECT count(name) FROM sqlite_master WHERE type='table' AND name='karten'")
    if cur.fetchone()[0] == 0 :
        cur.execute("CREATE TABLE karten (id int, name text, azubi_nr int)")
        con.commit()

def ImportData():
    with open('data.csv', newline='') as csvfile:
        spamreader = csv.reader(csvfile, delimiter=';', quotechar='|')
        for row in spamreader:
            cur.execute("SELECT count(id) FROM karten WHERE id=" + row[0])
            if cur.fetchone()[0] == 0 :
                cur.execute("INSERT INTO karten VALUES (?, ?, ?)", (row[0], row[1], row[2]))
            else:
                cur.execute("UPDATE karten SET name='" + row[1] + "', azubi_nr=" + row[2] + " WHERE id=" + row[0])
        
            # Ausgabe für eingelesene Daten
            print('--'.join(row))
            con.commit()

CheckDatabase()
ImportData()

while True:
    if not os.path.isfile("test.txt"):
        continue

    file = open('test.txt',mode='r')
    karten_nr = file.read()
    file.close()

    os.remove('test.txt')

    cur.execute("SELECT * FROM karten WHERE id=" + str(karten_nr))
    karte = cur.fetchone()

    # Text für Bildschirm zusammenbauen
    ausgabe = "Hallo " + str(karte[1]) + " (" + str(karte[2]) + ")"

    # Text ausgeben
    print(ausgabe)

con.close()

test.txt

10000000003