sqlite3 错误唯一约束失败：tablename.id

Question

我让这个 sqlite3 代码在程序主体中完美运行，我认为就是这样，但后来我编写了更多代码，因此它将每月执行一次（在每月的第一天(这就是它坏掉的原因。

我已经搜索了半天并查看了唯一键等等，但似乎问题是表名抛出了一个 UNIQUE 约束错误，这很奇怪，因为表存在，并且只有 1 个具有该名称的表。所有其他代码都应该可以正常工作。我试图将 INSERT INTO 更改为 INSERT 或 IGNORE INTO 并且 for 循环运行，但没有插入任何内容。我仔细检查了一下，桌子是空的。

def get_symbols_at_month_start() -> None:
"""Function inserts a list of symbols to trade every month into the currentMonthStocks table in database.db.
This is called once at the start of the month, deletes the current symbols and adds the new ones.
:return: None."""

print('running get symbols function')
# curl for marketsmith stocks:
url = "https://marketsmith.investors.com/mstool/api/tool/list-table"

payload = "{...}"
headers = {...}

response = requests.request("POST", url, headers=headers, data=payload)
symbols = response.json()['content']['allInstrumentRows']
this_months_symbols = []
for symbol in symbols:
    this_months_symbols.append(symbol['Symbol'])

# DATABASE
try:
    conn = sqlite3.connect('database.db')
    c = conn.cursor()
    print("Database Connected")

    # c.execute("""CREATE TABLE currentMonthStocks (
    #             id INT PRIMARY KEY,
    #             symbol TEXT,
    #             month INT)""")
    # print("DB created successfully")

    time_now = datetime.datetime.now()  # get current time for the int conversion below
    this_month_int = time_now.month  # get the current month and set it to an int
    db_row_id = 1  # set the first row number

    for i in range(len(this_months_symbols)):
        c.execute("""INSERT INTO currentMonthStocks
                   (id, symbol, month)
                   VALUES (?, ?, ?)""", (db_row_id, this_months_symbols[i], this_month_int))
        db_row_id += 1
        print("one more entry")
    print("symbols successfully populated into db")

    conn.commit()  # commits the current transaction.
    # c.close()  # closes the connection to the db.

except sqlite3.Error as e:
    print("sqlite3 error", e)

finally:
    if conn:
        conn.close()
        print("Database Closed")

# set the timing of the get_symbols_at_month_start() code
today = datetime.datetime.now()
nextMonth = (today.replace(day=1) + datetime.timedelta(days=32)).replace(day=1)  # get first day of next month
diffMins = ((nextMonth - today).total_seconds()) / 60.0  # get difference in minutes

scheduler = BackgroundScheduler()
# scheduler.add_job(func=get_symbols_at_month_start, trigger='interval', minutes=diffMins)
scheduler.add_job(func=get_symbols_at_month_start, trigger='interval', seconds=8)
scheduler.start()

Answer 1

上面提到了正确的答案，我需要在输入新行之前删除所有行。这个问题比它需要的要严重得多，因为我用来查看条目的应用程序 SQLite 的 DB Browser 有某种内部错误，我不得不重新启动计算机，然后结果证明我基本上正确地编写了代码。这最终成为正确的工作代码：

        if c.execute("""SELECT EXISTS(SELECT 1 FROM currentMonthStocks WHERE id=1 LIMIT 2);"""):
        # for i in range(len(this_months_symbols)):
        c.execute("""DELETE FROM currentMonthStocks""")
        print("delete all rows successful")

    time_now = datetime.datetime.now()  # get current time for the int conversion below
    this_month_int = time_now.month  # get the current month and set it to an int
    db_row_id = 1  # set the first row number

    for i in range(len(this_months_symbols)):
        c.execute("""INSERT INTO currentMonthStocks
                   (id, symbol, month)
                   VALUES (?, ?, ?)""", (db_row_id, this_months_symbols[i], this_month_int))
        db_row_id += 1
        print("one more entry")
    print("symbols successfully populated into db")