Question

import sqlite3 as sql
import os 

db_folder = "D:/Python/databases/accounts.sqlite"
db = sql.connect(db_folder)
im = sql.Cursor()

im.execute("""CREATE TABLE IF NOT EXISTS 'accounts' (              
          id    TEXT  DEFAULT 'account' UNIQUE             
          pw    TEXT  DEFAULT 'password
          email TEXT UNIQUE 
)
""")

datas = [
  ("eren.arc1","1236"),
  ("ern.arc"),
  (none,none,"erenarici@gmail.com")
]

if not os.path.exists(db_folder):
    for data in datas : 
        im.execute("""INSERT INTO 'accounts' VALUES (?,?,?)""",datas)
    db.commit()

我运行了这段代码，我收到了这个错误：

File "databases/db4.py", line 6, in <module>
im = sql.Cursor()
TypeError: function takes exactly 1 argument (0 given)

有什么问题？我没有经常在光标函数中看到参数。注意：我使用了cursor()但是我接受了sqlite3没有得到游标属性错误。然后我将其更改为Cursor()。

Answer 1

执行：

import sqlite3 as sql
import os 

sqlite_file = "db.sqlite"
conn = sql.connect(sqlite_file)
c = conn.cursor()

c.execute("""CREATE TABLE IF NOT EXISTS accounts (
          id TEXT DEFAULT 'account' UNIQUE,
          pw TEXT DEFAULT 'password',
          email TEXT UNIQUE);""")

items = [
  ("id1", "pw1", "user1@gmail.com"),
  ("id2", "pw2", "user2@gmail.com"),
  ("id3", "pw3", "user3@gmail.com")
]

for item in items: 
    c.execute("""INSERT INTO accounts VALUES (?,?,?);""", item)

c.execute("""INSERT INTO accounts(id, email) VALUES ('id4', 'user4@gmail.com');""")
c.execute("""INSERT INTO accounts(email) VALUES ('account@gmail.com');""")

for row in c.execute('SELECT * FROM accounts'):
    print(row)

conn.commit()
conn.close()

输出：

('id1', 'pw1', 'user1@gmail.com')
('id2', 'pw2', 'user2@gmail.com')
('id3', 'pw3', 'user3@gmail.com')
('id4', 'password', 'user4@gmail.com')
('account', 'password', 'account@gmail.com')

如果您尊重每个字段的顺序，您可以检查item元组的长度以在循环中执行插入：

for item in items: 
    if len(item) == 3:
        c.execute("""INSERT INTO accounts VALUES (?,?,?);""", item)
    elif len(item) == 2:
        c.execute("""INSERT INTO accounts(pw, email) VALUES (?,?);""", item)
    elif len(item) == 1:
        c.execute("""INSERT INTO accounts(email) VALUES (?);""", item)

但是(none, none, 'email')在这里没有意义，使用关键字NULL插入NULL数据（如果python是None而不是none）。

sqlite python游标函数错误

1 个答案: