Table of Contents
Correct answer
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

Not sure why I get a syntax error when trying to run a SQL UPDATE query using an f string

Feb 09, 2024 pm 10:24 PM

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())

Copy after login

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())
Copy after login

Output:

>>> enter your firstname: ollie
>>> enter your lastname: burgess
>>> enter your new school number: 20000
>>> [(1, 20000, 'ollie', 'burgess')]
Copy after login

or another option:

c.execute("select schoolnum, lastname from bartonhill where firstname = ?;", (firstname,))
print(c.fetchone())
Copy after login

Only gives you specific values:

(20000, 'Burgess')
Copy after login

The above is the detailed content of Not sure why I get a syntax error when trying to run a SQL UPDATE query using an f string. For more information, please follow other related articles on the PHP Chinese website!

Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

AI Hentai Generator

AI Hentai Generator

Generate AI Hentai for free.

Hot Article

R.E.P.O. Energy Crystals Explained and What They Do (Yellow Crystal)
4 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. Best Graphic Settings
4 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. How to Fix Audio if You Can't Hear Anyone
4 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
WWE 2K25: How To Unlock Everything In MyRise
1 months ago By 尊渡假赌尊渡假赌尊渡假赌

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

How to solve the permissions problem encountered when viewing Python version in Linux terminal? How to solve the permissions problem encountered when viewing Python version in Linux terminal? Apr 01, 2025 pm 05:09 PM

Solution to permission issues when viewing Python version in Linux terminal When you try to view Python version in Linux terminal, enter python...

How to efficiently copy the entire column of one DataFrame into another DataFrame with different structures in Python? How to efficiently copy the entire column of one DataFrame into another DataFrame with different structures in Python? Apr 01, 2025 pm 11:15 PM

When using Python's pandas library, how to copy whole columns between two DataFrames with different structures is a common problem. Suppose we have two Dats...

How to teach computer novice programming basics in project and problem-driven methods within 10 hours? How to teach computer novice programming basics in project and problem-driven methods within 10 hours? Apr 02, 2025 am 07:18 AM

How to teach computer novice programming basics within 10 hours? If you only have 10 hours to teach computer novice some programming knowledge, what would you choose to teach...

How to avoid being detected by the browser when using Fiddler Everywhere for man-in-the-middle reading? How to avoid being detected by the browser when using Fiddler Everywhere for man-in-the-middle reading? Apr 02, 2025 am 07:15 AM

How to avoid being detected when using FiddlerEverywhere for man-in-the-middle readings When you use FiddlerEverywhere...

How does Uvicorn continuously listen for HTTP requests without serving_forever()? How does Uvicorn continuously listen for HTTP requests without serving_forever()? Apr 01, 2025 pm 10:51 PM

How does Uvicorn continuously listen for HTTP requests? Uvicorn is a lightweight web server based on ASGI. One of its core functions is to listen for HTTP requests and proceed...

What are regular expressions? What are regular expressions? Mar 20, 2025 pm 06:25 PM

Regular expressions are powerful tools for pattern matching and text manipulation in programming, enhancing efficiency in text processing across various applications.

How to dynamically create an object through a string and call its methods in Python? How to dynamically create an object through a string and call its methods in Python? Apr 01, 2025 pm 11:18 PM

In Python, how to dynamically create an object through a string and call its methods? This is a common programming requirement, especially if it needs to be configured or run...

What are some popular Python libraries and their uses? What are some popular Python libraries and their uses? Mar 21, 2025 pm 06:46 PM

The article discusses popular Python libraries like NumPy, Pandas, Matplotlib, Scikit-learn, TensorFlow, Django, Flask, and Requests, detailing their uses in scientific computing, data analysis, visualization, machine learning, web development, and H

See all articles