Python - Delete Data Row In SQLite

Submitted by razormist on Tuesday, October 1, 2019 - 19:14.

In this tutorial we will create a Delete Data Row In SQLite using Python. This code will delete a data in the SQLite database when user click the delete button. The code use tkinter module to create a layout and widgets that can call a specific python functions. When a function is called it will launch a script the dynamically delete a data from the SQLite using SQL DELETE query. We will be using Python programming language because it is widely used as an advance-level programming language for a general technique to the developer. Beginners find Python a clean syntax and indentation structure based, and it is easy to learn because of its less semi colon problem.

Getting started:

First you will have to download & install the Python IDLE's, here's the link for the Integrated Development And Learning Environment for Python https://www.python.org/downloads/.

Installing SQLite Browser

After you installed Python, we will now then install the SQLite, here's the link for the DB Browser for SQLite http://sqlitebrowser.org/.

Importing Modules

After setting up the installation and the database, run the IDLE and click file and then new file. After that a new window will appear containing a black file this will be the text editor for the python. Then copy code that I provided below and paste it inside the IDLE text editor.

from tkinter import*
import tkinter.ttk as ttk
import tkinter.messagebox as tkMessageBox
import connection

Setting up the Main Frame

After importing the modules, we will now then create the main frame for the application. To do that just copy the code below and paste it inside the IDLE text editor.

root = Tk()
root.title("Python - Delete Data Row In SQLite")
screen_width = root.winfo_screenwidth()
screen_height = root.winfo_screenheight()
width = 700
height = 300
x = (screen_width/2) - (width/2)
y = (screen_height/2) - (height/2)
root.geometry('%dx%d+%d+%d' % (width, height, x, y))
root.resizable(0, 0)

Creating the Database Connection

Then after setting up the design we will now create the database function. To do that just simply copy the code below and paste it inside the IDLE text editor, then save it as connection.py.

import sqlite3
 
def Database():
    global conn, cursor
    conn = sqlite3.connect('db_member.db')
    cursor = conn.cursor()
    cursor.execute("CREATE TABLE IF NOT EXISTS `member` (mem_id INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, firstname TEXT, lastname TEXT, address TEXT)")

Designing the Layout

After creating the Main Frame we will now add some layout to the application. Just kindly copy the code below and paste it inside the IDLE text editor.

#==================================FRAME==============================================
Top = Frame(root, width=700, height=50, bd=8, relief="raise")
Top.pack(side=TOP)
Button_Group=Frame(root, width=700, height=50)
Button_Group.pack(side=TOP)
Buttons = Frame(Button_Group, width=250, height=50)
Buttons.pack(side=LEFT)
Buttons1 = Frame(Button_Group, width=450, height=50)
Buttons1.pack(side=RIGHT)
Body = Frame(root, width=700, height=300, bd=8, relief="raise")
Body.pack(side=BOTTOM)
 
 
#==================================LABEL WIDGET=======================================
txt_title = Label(Top, width=300, font=('arial', 24), text = "Python - Delete Data Row In SQLite")
txt_title.pack()
 
#==================================BUTTONS WIDGET=====================================
btn_delete = Button(Buttons, width=15, text="Delete", command=Delete)
btn_delete.pack(side=LEFT)
 
 
#==================================LIST WIDGET========================================
scrollbary = Scrollbar(Body, orient=VERTICAL)
scrollbarx = Scrollbar(Body, orient=HORIZONTAL)
tree = ttk.Treeview(Body, columns=("MemberID", "Firstname", "Lastname", "Address"), selectmode="extended", height=500, yscrollcommand=scrollbary.set, xscrollcommand=scrollbarx.set)
scrollbary.config(command=tree.yview)
scrollbary.pack(side=RIGHT, fill=Y)
scrollbarx.config(command=tree.xview)
scrollbarx.pack(side=BOTTOM, fill=X)
tree.heading('MemberID', text="MemberID", anchor=W)
tree.heading('Firstname', text="Firstname", anchor=W)
tree.heading('Lastname', text="Lastname", anchor=W)
tree.heading('Address', text="Address", anchor=W)
tree.column('#0', stretch=NO, minwidth=0, width=0)
tree.column('#1', stretch=NO, minwidth=0, width=0)
tree.column('#2', stretch=NO, minwidth=0, width=150)
tree.column('#3', stretch=NO, minwidth=0, width=200)
tree.column('#4', stretch=NO, minwidth=0, width=200)
tree.pack()

Creating the Main Function

This is where the code that contains the main funcitions. This code will delete a data in SQLite database when the button is clicked. To do that just copy and write these blocks of code.

#==================================METHODS============================================
def DisplayData():
    tree.delete(*tree.get_children())
    connection.Database()
    connection.cursor.execute("SELECT * FROM `member` ORDER BY `lastname` ASC")
    fetch = connection.cursor.fetchall()
    for data in fetch:
        tree.insert('', 'end', values=(data[0], data[1], data[2], data[3]))
    connection.cursor.close()
    connection.conn.close()
 
def Delete():
    if tree.selection():
        result = tkMessageBox.askquestion('Python - Delete Data Row In SQLite', 'Are you sure you want to delete this record?', icon="warning")
        if result == 'yes':
            curItem = tree.focus()
            contents =(tree.item(curItem))
            selecteditem = contents['values']
            tree.delete(curItem)
            connection.Database()
            connection.cursor.execute("DELETE FROM `member` WHERE `mem_id` = %d" % selecteditem[0])
            connection.conn.commit()
            connection.cursor.close()
            connection.conn.close()
        else:
            DisplayData()

Initializing the Application

After finishing the function save the application as index.py. This function will run the code and check if the main application is initialized properly. To do that copy the code below and paste it inside the IDLE text editor.

#==================================INITIALIZATION=====================================
DisplayData()
if __name__ == '__main__':
    root.mainloop()

There you have it we just created a Delete Data Row In SQLite using Python. I hope that this simple tutorial help you for what you are looking for. For more updates and tutorials just kindly visit this site. Enjoy Coding!!

Add new comment

391 views