为什么我的 SQLite 自动增量查询不起作用？

Question

总的来说，我是 SQLite 和 SQL 的新手，最近我一直在尝试使用自动增量功能，我在代码中做错了，因为自动增量根本不填充列（只是 returns “None”）。

import sqlite3

make_table = "CREATE TABLE IF NOT EXISTS products (product_ID INTEGER PRIMARY KEY AUTOINCREMENT, name varchar(50), price int);"
c.execute(make_table)

insert_apple = "INSERT INTO products (name, price) VALUES ('apple', 2);"
c.execute(insert_apple)
insert_orange = "INSERT INTO products (name, price) VALUES ('orange', 2);"
c.execute(insert_orange)
insert_banana = "INSERT INTO products (name, price) VALUES ('banana', 3);"
c.execute(insert_banana)

select_products = "SELECT * FROM products;"
c.execute(select_products)
print(c.fetchall())

我已经查看了一般使用AUTOINCREMENT的方法，但错误不断重复，我找不到我的错误，也没有找到任何相同问题的问题。我看到有人提到 ROWID，但 none 的解释感觉足够透彻，并解释了如何使用它。

如有任何帮助，我们将不胜感激。

编辑：我刚刚尝试使用与此相同的技术制作一个假人并且它起作用了，所以它一定是上面代码中某处的错字。

这是有效的假人的完整代码：

import sqlite3

try:
    connection = sqlite3.connect('SQLite_Python.db')
    c = connection.cursor()
    print("Database created and Successfully Connected to SQLite")

    create_table = "CREATE TABLE IF NOT EXISTS users (id INTEGER PRIMARY KEY AUTOINCREMENT, name varchar(50), age INTEGER);"
    insert_data1 = "INSERT INTO users (name, age) VALUES ('John', 25);"
    insert_data2 = "INSERT INTO users (name, age) VALUES ('Jessica', 27);"
    c.execute(create_table)
    c.execute(insert_data2)
    c.execute(insert_data1)

except sqlite3.Error as error:
    print("Error while connecting to sqlite", error)

select_data = "SELECT * FROM users;"
c.execute(select_data)
print(c.fetchall())

所以我猜这是一个打字错误，如果结果是这样，我将关闭此 post

Answer 1

这对我有用：

import sqlite3

con = sqlite3.connect('test')

with con:

    c = con.cursor()

    make_table = "CREATE TABLE IF NOT EXISTS products (product_ID INTEGER PRIMARY KEY AUTOINCREMENT, name varchar(50), price int);"
    c.execute(make_table)

    insert_apple = "INSERT INTO products (name, price) VALUES ('apple', 2);"
    c.execute(insert_apple)
    insert_orange = "INSERT INTO products (name, price) VALUES ('orange', 2);"
    c.execute(insert_orange)
    insert_banana = "INSERT INTO products (name, price) VALUES ('banana', 3);"
    c.execute(insert_banana)

    select_products = "SELECT * FROM products;"
    c.execute(select_products)
    print(c.fetchall())

结果：

[(1, 'apple', 2), (2, 'orange', 2), (3, 'banana', 3)]

为什么我的 SQLite 自动增量查询不起作用？

Why is my SQLite Autoincrement query not working?

python

sqlite