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HomeBackend DevelopmentPython TutorialNot sure why I get a syntax error when trying to run a SQL UPDATE query using an f string

不知道为什么在尝试使用 f 字符串运行 SQL UPDATE 查询时出现语法错误

Question content

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


Correct answer


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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