When you are working with databases and storing data, there are times when records become obsolete and need deleting. For instance, a student may leave and his/her record would no longer need to be stored on file. This function shows you how to delete a record in Python and SQlite
import sqlite3 #The code below will delete Nick's record entirely from the database def deleting(): conn=sqlite3.connect('test.db') conn.execute("DELETE from STUDENT where ID = 3;") conn.commit() print("Total number of rows deleted :", conn.total_changes) cursor = conn.execute("SELECT id, name, comment, points from STUDENT") for row in cursor: print("ID = ", row[0]) print("NAME = ", row[1]) print("COMMENTS = ", row[2]) print("POINTS = ", row[3], "\n") print("====Your request to delete has been completed=====") conn.close() def update_database(): conn = sqlite3.connect('test.db') conn.execute("UPDATE STUDENT set POINTS = 99000.00 where ID = 4") conn.commit print("Total number of rows updated :", conn.total_changes) cursor = conn.execute("SELECT id, name, comment, points from STUDENT") for row in cursor: print ("ID = ", row[0]) print ("NAME = ", row[1]) print ("COMMENT = ", row[2]) print ("POINTS = ", row[3], "\n") print("===Request complete===") conn.close() def create_table(): conn = sqlite3.connect('test.db') print("Opened database") conn.execute('''CREATE TABLE STUDENT (ID INT PRIMARY KEY NOT NULL, NAME TEXT NOT NULL, AGE INT NOT NULL, COMMENT CHAR(50), POINTS REAL);''') print("A database table has been created now") conn.close() def add_records(): conn=sqlite3.connect('test.db') conn.execute("INSERT INTO STUDENT (ID,NAME,AGE,COMMENT,POINTS) \ VALUES (1, 'Jonathan', 14, 'One of our top students!', 20000.00 )"); conn.execute("INSERT INTO STUDENT (ID,NAME,AGE,COMMENT,POINTS) \ VALUES (2, 'Ruth', 15, 'An all rounder - wonderful!', 15000.00 )"); conn.execute("INSERT INTO STUDENT (ID,NAME,AGE,COMMENT,POINTS) \ VALUES (3, 'Nick', 14, 'Lacks drive and motivation. Rude.', 2.00 )"); conn.execute("INSERT INTO STUDENT (ID,NAME,AGE,COMMENT,POINTS) \ VALUES (4, 'Pigachee', 15, 'No.1 at everything.Simply Amazing!', 65000.00 )"); conn.commit() print("Records have been created") conn.close() def fetch_display(): conn = sqlite3.connect('test.db') cursor = conn.execute("SELECT id, name, comment, points from STUDENT") for row in cursor: print ("ID=" ,row[0]) print ("NAME = ", row[1]) print ("COMMENT = ", row[2]) print ("POINTS = ", row[3], "\n") print ("Operation has been completed as per your request") conn.close() deleting()