SQL using Python and SQLite | Set 2

# code for update operation
import sqlite3

# database name to be passed as parameter
conn = sqlite3.connect('mydatabase.db')

# update the student record
conn.execute("UPDATE Student SET name = 'Sam' where unix='B113059'")
conn.commit()

print "Total number of rows updated :", conn.total_changes

cursor = conn.execute("SELECT * FROM Student")
for row in cursor:
   print row,

conn.close()

# code for delete operation
import sqlite3

# database name to be passed as parameter
conn = sqlite3.connect('mydatabase.db')

# delete student record from database
conn.execute("DELETE from Student where unix='B113058'")
conn.commit()
print "Total number of rows deleted :", conn.total_changes

cursor = conn.execute("SELECT * FROM Student")
for row in cursor:
   print row,

conn.close()

# code for executing query using input data
import sqlite3

# creates a database in RAM
con = sqlite3.connect(":memory:")
cur = con.cursor()
cur.execute("create table person (name, age, id)")

print ("Enter 5 students names:")
who = [raw_input() for i in range(5)]
print ("Enter their ages respectively:")
age = [int(raw_input()) for i in range(5)]
print ("Enter their ids respectively:")
p_id = [int(raw_input()) for i in range(5)]
n = len(who)

for i in range(n):

    # This is the q-mark style:
    cur.execute("insert into person values (?, ?, ?)", (who[i], age[i], p_id[i]))

    # And this is the named style:
    cur.execute("select * from person")

    # Fetches all entries from table
    print cur.fetchall()

# graph visualization using matplotlib library
import matplotlib.pyplot as plt

def graph_data(p_id,age):

    # plotting the points    
    plt.plot(p_id, age, color='yellow', linestyle='dashed', linewidth = 3,
    marker='*', markerfacecolor='blue', markersize=12)

    # naming the x axis
    plt.xlabel('Persons Id')

    # naming the y axis
    plt.ylabel('Ages')

    # plt.plot(p_id,age)
    plt.show()

print ("Enter 5 students names:")
who = [raw_input() for i in range(5)]
print ("Enter their ages respectively:")
age = [int(raw_input()) for i in range(5)]
print ("Enter their ids respectively:")
p_id = [int(raw_input()) for i in range(5)]

# calling graph function
graph_data(p_id,age)