python - 不要使用已删除的主键

Question

插入 id 1 和 2。删除 id 2。插入新行，它获得 id 2 而不是 3。我该如何更改它？我不想重复使用主键。

import sqlite3, os

os.remove('mydatabase.db')
conn = sqlite3.connect("mydatabase.db") # or use :memory: to put it in RAM
cursor = conn.cursor()

# create a table
cursor.execute("CREATE TABLE if not exists albums (id INTEGER PRIMARY KEY NOT NULL, title text, artist text, release_date text, publisher text, media_type text)")
cursor.execute("CREATE TABLE if not exists anti (id INTEGER, title text, artist text, release_date text, publisher text, media_type text)")
conn.commit()

cursor.execute("INSERT INTO albums VALUES (null, 'Glow', 'Andy Hunter', '7/24/2012', 'Xplore Records', 'MP3')")
cursor.execute("INSERT INTO albums VALUES (null, 'second', 'artist', '7/24/2012', 'Xplore Records', 'MP3')")
conn.commit()

cursor.execute("SELECT * FROM albums")
print(cursor.fetchall())

cursor.execute("INSERT INTO anti SELECT * FROM albums WHERE title='second'")
cursor.execute("DELETE FROM albums WHERE title='second'")
cursor.execute("INSERT INTO albums VALUES (null, 'third', 'artist', '7/24/2012', 'Xplore Records', 'MP3')")
conn.commit()

cursor.execute("SELECT * FROM albums")
print(cursor.fetchall())
cursor.execute("SELECT * FROM anti")
print(cursor.fetchall())

Answer 1

来自 https://www.sqlite.org/autoinc.html :

If the AUTOINCREMENT keyword appears after INTEGER PRIMARY KEY, that changes the automatic ROWID assignment algorithm to prevent the reuse of ROWIDs over the lifetime of the database. In other words, the purpose of AUTOINCREMENT is to prevent the reuse of ROWIDs from previously deleted rows.