Python SQLite3 Database Tutorial

This tutorial will show how to start using the built in database that Python provides. The library comes pre-installed with Python and is named SQLite3 . SQLite can be used to create a tables , databases, and run queries.

To learn more about SQLite and what it can do, check out their site . They provide very good documentation , here is the link to reference for this tutorial.

Step One :

First, the sqlite3 library must be imported. Then the database file must be created. Connection or connect allows the sending and receiving of data such as strings. The Cursor instance allows the connection to send and receive data.

import sqlite3

#Creating table
dataBase = sqlite3.connect('Test.db')

cur = dataBase.cursor()

Step Two:

Now that the table has been created, the data it contains must be given a label. Here the table will store the user data. Each user will be given a Name and Phone number. In SQLite tables, the values each label is going to store needs to be set.

Notice how the Name label is set to store a text value and the Phone is set to store a real value. Once the label are created, user data can then be added to the table

#Setting table labels
cur.execute('''CREATE TABLE user
             (Name text, Phone real)''')

# Insert  data
cur.execute("INSERT INTO user VALUES ('Joe',1234567)")

Final Step

Lastly, the connection to the database must be closed and the changes to the database must be Committed.

# Save (commit) the changes. ALWAYS COMMIT any changes
dataBase.commit()

#Closing connection
dataBase.close()

Testing Database

Lets check if the database file is running correctly. Here the execute method is used to check if the SQL table is storing the user’s Name “Joe“. If the table contains a user with a Name equal to Joe, it will print out that user’s info. The method fetchone() will be used because only one user will be returned

import sqlite3

#Creating table
dataBase = sqlite3.connect('Test.db')
cur = dataBase.cursor()

var = ('Joe',)
#Check if Name is being stored
cur.execute('SELECT * FROM user WHERE Name=?', var)
print (cur.fetchone())

Output:

('Joe', 1234567)

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