python - 值错误 : operation parameter must be str

我正在尝试使用 python 函数将一些数据库字段更新到 SQLite DB。我不断收到以下错误:

ValueError: 操作参数必须是 str

下面是我的代码。我很想知道如何更新 sqlite 数据库中的多个列。

def updateEventData():
    ID = input('Enter ID of row you\'d like to update: ')
    eventname = input('\nPlease enter event name: ')
    startdate = input('\nPlease enter event start date: (DD/MM/YYYY): ')
    enddate = input('\nPlease enter event end date: (DD/MM/YYYY): ')
    venue = input('\nPlease enter event venue: ')

    # Sql update
    sql = """
    UPDATE event_details
    SET name, startdate, enddate, venue, (?, ?, ?, ?)
    WHERE ROWID = ?
    """, (eventname, startdate, enddate, venue, ID)
    c.execute(sql)
    conn.commit()

最佳答案

您需要单独传递 sql 和参数，而不是作为包含 sql 和参数的元组:

sql = """
UPDATE event_details
SET name, startdate, enddate, venue, (?, ?, ?, ?)
WHERE ROWID = ?
"""
c.execute(sql, (eventname, startdate, enddate, venue, ID))
#         ^^^  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
#     separated argument, not as a single argument
conn.commit()

见 DB API 2 documentation, Cursor.execute(operation, parameter)

关于python - 值错误 : operation parameter must be str，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/41807577/