Home >Backend Development >Python Tutorial >Not sure why I get a syntax error when trying to run a SQL UPDATE query using an f string
I am trying to run a basic sql query to update the value of schoolnum in a database named bartonhill, using an f string to put the value enter
import sqlite3 name = [input('enter your firstname: ')] conn = sqlite3.connect('revision.db') c = conn.cursor() # create table c.execute('''CREATE TABLE IF NOT EXISTS bartonHill ( firstName TEXT NOT NULL, lastName TEXT NOT NULL, schoolNum INTEGER NOT NULL PRIMARY KEY )''') conn.commit() c.execute("INSERT INTO bartonHill VALUES ('Ollie','Burgess','20314')") conn.commit() new_number = tuple[(int(input('enter your new school number')))] c.execute(f"UPDATE bartonHill set schoolNum = '{new_number}' WHERE firstName = '{name}'") conn.commit c.execute('SELECT lastName, schoolNum FROM bartonHill WHERE firstName = (?)',name) print(c.fetchall())
However, if I enter my name ollie (which exists in the database as firsname), running this code gives the error "sqlite3.operationalerror: near "ollie": syntax error"
I tried changing the data type of name and new_number but this only changed the error
There is still a lot to improve. I only made some small changes, you can improve it further. Tuples are always inserted. Changing the primary key is possible but not that easy, just google it. Requests a new value after initializing the value for the first time. Please also read the comments above carefully!
import sqlite3 conn = sqlite3.connect('revision.db') c = conn.cursor() # create table c.execute('''create table if not exists bartonhill ( id integer primary key autoincrement, schoolnum integer not null, firstname text not null, lastname text not null )''') conn.commit() c.execute("insert into bartonhill (schoolnum,firstname,lastname) values (?,?,?); ", (20314, 'ollie','burgess')) conn.commit() # ask for changes here firstname = input('enter your firstname: ') lastname = input('enter your lastname: ') new_number = int(input('enter your new school number: ')) c.execute("update bartonhill set schoolnum = ? where firstname = ?;", (new_number, firstname)) conn.commit c.execute("select * from bartonhill where firstname = ?;", (firstname,)) print(c.fetchall())
Output:
>>> enter your firstname: ollie >>> enter your lastname: burgess >>> enter your new school number: 20000 >>> [(1, 20000, 'ollie', 'burgess')]
or another option:
c.execute("select schoolnum, lastname from bartonhill where firstname = ?;", (firstname,)) print(c.fetchone())
Only gives you specific values:
(20000, 'Burgess')
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