In this article, we are going to update all the values of a specific column of a given SQLite table using Python. In order to update all the columns of a particular table in SQL, we use the UPDATE query. The UPDATE statement in SQL is used to update the data of an existing table in the database. We can update single columns as well as multiple columns using the UPDATE statement as per our requirement.
Syntax:
UPDATE table_name
SET column_name=value;
We are going to create a table and then perform update operations in it.
Python3
# importing sqlite module import sqlite3 # create connection to the database my_database connection = sqlite3.connect('my_database.db') # create table named address of customers # with 4 columns id,name age and address connection.execute('''CREATE TABLE ship (ship_id INT, ship_name \ TEXT NOT NULL, ship_destination CHAR(50) NOT NULL); ''') print("Ship table created successfully") # close the connection connection.close() |
Output:
Ship table created successfully
Example 1:
Python program to insert records and perform update queries. Here we update all data in the ship_name column to manoji.
Python3
# import sqlite module database import sqlite3 # create connection to the database # my_database connection = sqlite3.connect('my_database.db') # insert query to insert values connection.execute("INSERT INTO ship VALUES (1, 'tata-hitachi','noida' )") connection.execute("INSERT INTO ship VALUES (2, 'tata-mumbai','mumbai' )") connection.execute("INSERT INTO ship VALUES (3, 'tata-express','hyderabad' )") # query to display all data in the table cursor = connection.execute("SELECT * from ship") print("before updation") # display row by row for row in cursor: print(row) # query to update all data in ship_name # column to manoji connection.execute("UPDATE ship set ship_name='manoji'") print("After updation") # display row by row cursor = connection.execute("SELECT * from ship") for row in cursor: print(row) # close the connection connection.close() |
Output:
Example 2:
In this program, we first insert data then update all data in ship_address to Delhi in the same table.
Python3
# import sqlite module database import sqlite3 # create connection to the database # my_database connection = sqlite3.connect('my_database.db') # insert query to insert values connection.execute("INSERT INTO ship VALUES (1, 'tata-hitachi','noida' )") connection.execute("INSERT INTO ship VALUES (2, 'tata-mumbai','mumbai' )") connection.execute("INSERT INTO ship VALUES (3, 'tata-express','hyderabad' )") # query to display all data in the table cursor = connection.execute("SELECT * from ship") print("before updation of ship address") # display row by row for row in cursor: print(row) # query to update all data in ship_address connection.execute("UPDATE ship set ship_destination='delhi'") print("After updation of ship address") # display row by row cursor = connection.execute("SELECT * from ship") for row in cursor: print(row) # close the connection connection.close() |
Output:
