问题内容
我正在尝试运行基本的 sql 查询来更新名为 bartonhill 的数据库中 schoolnum 的值，使用 f 字符串将值放入
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())
但是，如果我输入我的名字 ollie（作为 firsname 存在于数据库中），则运行此代码会出现错误“ sqlite3.operationalerror：near“ollie”：语法错误”
我尝试更改 name 和 new_number 的数据类型，但这仅更改了错误
正确答案
还有很多需要改进的地方。我只做了一些小改动，你可以进一步改进。始终插入元组。更改主键是可能的，但不是那么容易，谷歌一下。首次初始化值后请求新值。也请仔细阅读上面的评论！
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())
输出：
>>> enter your firstname: ollie >>> enter your lastname: burgess >>> enter your new school number: 20000 >>> [(1, 20000, 'ollie', 'burgess')]
或另一个选择：
c.execute("select schoolnum, lastname from bartonhill where firstname = ?;", (firstname,))
print(c.fetchone())
仅给您特定值：
(20000, 'Burgess')
