我正在嘗試執行基本的sql 查詢來更新名為bartonhill 的資料庫中schoolnum 的值，使用f 字串將值放入
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，如果我輸入我的名字 ollie（作為 firsname 存在於資料庫中），則執行此程式碼會出現錯誤「 sqlite3.operationalerror：near「ollie」：語法錯誤」
我嘗試更改 name 和 new_number 的資料類型，但這只更改了錯誤
還有很多需要改進的地方。我只做了一些小改動，你可以進一步改進。始終插入元組。更改主鍵是可能的，但不是那麼容易，谷歌一下。首次初始化值後請求新值。也請仔細閱讀上面的評論！
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())輸出：
>>> enter your firstname: ollie >>> enter your lastname: burgess >>> enter your new school number: 20000 >>> [(1, 20000, 'ollie', 'burgess')]
或另一個選擇：
c.execute("select schoolnum, lastname from bartonhill where firstname = ?;", (firstname,))
print(c.fetchone())僅給您特定值：
(20000, 'Burgess')
以上是不知道為什麼在嘗試使用 f 字串執行 SQL UPDATE 查詢時會出現語法錯誤的詳細內容。更多資訊請關注PHP中文網其他相關文章！
