Generate and save PDFs with Student Information from user input using Python and SQLite

Part 1 : User selection of Path to save PDF file

import tkinter as tk
from tkinter import filedialog
from tkinter.filedialog import asksaveasfile
from reportlab.pdfgen import canvas
my_w = tk.Tk()
my_w.geometry("400x300")  # Size of the window 
my_w.title('www.plus2net.com')
my_font1=('times', 18, 'bold')
l1 = tk.Label(my_w,text='Save File',width=30,font=my_font1)  
l1.grid(row=1,column=1)
b1 = tk.Button(my_w, text='Save', 
   width=20,command = lambda:save_file())
b1.grid(row=2,column=1) 
def save_file():
    file = filedialog.asksaveasfilename(
        filetypes=[("pdf file", ".pdf")],
    defaultextension=".pdf")
    save_pdf(file) # create and save the pdf in given path

def save_pdf(my_path): # save the pdf file in given path
    c = canvas.Canvas(my_path,bottomup=0)
    c.drawString(200,200,"Hello World") # write text in page 
    c.showPage() # saves current page
    c.save() # stores the file and close  the canvas
    my_w.destroy() #Close the window
my_w.mainloop()  # Keep the window open

• Importing Libraries: The script imports `tkinter` for the GUI, `filedialog` for the save dialog, and `canvas` from `reportlab` to generate PDFs.
• GUI Setup: The window (`my_w`) contains a label and a "Save" button. The button calls the `save_file()` function when clicked.
• save_file() Function: Opens a save dialog, where the user can choose the filename and location. It then calls `save_pdf()` to create the PDF.
• save_pdf() Function: Uses `canvas` to generate a PDF file with the "Hello World" text and saves it to the specified location. The window then closes.

Part II : Taking user input to PDF document

• Entry Widget:

  e1 = tk.Entry(my_w, width=3, bg='lightyellow')

  This widget allows the user to input the student ID directly into the GUI.
• Using Input in PDF Generation:

  c.drawString(200, 200, "Hello World " + e1.get())

  The entered student ID is retrieved using e1.get() and is combined with the text "Hello World". This text is then printed on the PDF at the specified coordinates.

import tkinter as tk
from tkinter import filedialog
from tkinter.filedialog import asksaveasfile
from reportlab.pdfgen import canvas
my_w = tk.Tk()
my_w.geometry("400x300")  # Size of the window 
my_w.title('www.plus2net.com')
my_font1=('times', 18, 'bold')
l1 = tk.Label(my_w,text='Save File',width=30,font=my_font1)  
l1.grid(row=1,column=1,columnspan=2)
e1=tk.Entry(my_w,width=3,bg='lightyellow')
e1.grid(row=2,column=1)
b1 = tk.Button(my_w, text='Save', 
   width=20,command = lambda:save_file())
b1.grid(row=2,column=2) 
def save_file():
    file = filedialog.asksaveasfilename(
        filetypes=[("pdf file", ".pdf")],
    defaultextension=".pdf")
    save_pdf(file)

def save_pdf(my_path):

    c = canvas.Canvas(my_path,bottomup=0)
    c.drawString(200,200,"Hello World " + e1.get()) # write text in page 
    c.showPage() # saves current page
    c.save() # stores the file and close  the canvas
    my_w.destroy() #Close the window
my_w.mainloop()  # Keep the window open

Part III: Using user input to collect data from database and use the same for pdf generation

• User Input: The user enters a student ID into a `tk.Entry` widget (`e1`). This ID is used to query the database for the student's details.
• Database Connection: A connection to the SQLite database (`my_db.db`) is established using SQLAlchemy.
• Retrieving Data: The `save_pdf()` function queries the database for the student details using the provided ID. The result is stored in `data_row`.
• Generating PDF: The `reportlab` library's `canvas` is used to create a PDF. The student's name and class are written to the PDF at specified positions.
• Saving the File: The PDF is saved to the path specified by the user in the save dialog, and the application window closes after saving.

import tkinter as tk
from tkinter import filedialog
from tkinter.filedialog import asksaveasfile
from reportlab.pdfgen import canvas
from reportlab.lib.units import inch
from sqlalchemy import create_engine,text
my_conn = create_engine("sqlite:///E:\\testing\\sqlite\\my_db.db")
my_conn=my_conn.connect() 

my_w = tk.Tk()
my_w.geometry("400x300")  # Size of the window 
my_w.title('www.plus2net.com')
my_font1=('times', 18, 'bold')
l1 = tk.Label(my_w,text='Save File',width=30,font=my_font1)  
l1.grid(row=1,column=1,columnspan=2)
e1=tk.Entry(my_w,width=6,bg='lightyellow',font=16)
e1.grid(row=2,column=1)
b1 = tk.Button(my_w, text='Save', 
   width=20,command = lambda:save_file())
b1.grid(row=2,column=2) 
def save_file():
    file = filedialog.asksaveasfilename(
        filetypes=[("pdf file", ".pdf")],
    defaultextension=".pdf")
    save_pdf(file)

def save_pdf(my_path):

    c = canvas.Canvas(my_path,bottomup=0)

    r_set=my_conn.execute(text("SELECT * from student where id= "+ e1.get()))
    data_row=r_set.fetchone()
    #print(data_row[1])
    c.drawRightString(2*inch,2*inch,'Name:')
    c.drawRightString(4*inch,2*inch,data_row[1])
    c.drawRightString(2*inch,2.3*inch,'Class:')
    c.drawRightString(4*inch,2.3*inch,data_row[2])
	
    c.showPage() # saves current page
    c.save() # stores the file and close  the canvas
    my_w.destroy() #Close the window
my_w.mainloop()  # Keep the window open

Subhendu Mohapatra

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