Asyncpg INSERT query for timestamp returns ERROR syntax error at or near "18"

Question

您好，我在尝试添加时间戳时遇到错误。我不断收到错误 asyncpg.exceptions.PostgresSyntaxError: syntax error at or near "18"，这一行 end_date = duration + dt.datetime.now(bst) # timestamp 似乎是罪魁祸首，但我不确定为什么会这样。

这是我正在处理的内容：

    if time is not None:
        conn = await asyncpg.connect(DATABASE_URL)
        async with conn.transaction():
            await conn.fetch(f"SELECT time FROM blacklist WHERE username={member.id}")
        
            duration = find_date(time)
            bst = pytz.timezone('Europe/London')
            end_date = duration + dt.datetime.now(bst) # timestamp
            fmt_date = end_date.strftime("%#d %b %Y, at %I:%M%p")
            await conn.fetch(f"UPDATE blacklist SET time={end_date} WHERE username={member.id}")
        
            await member.add_roles(restricted, reason=f'Restricted role added by {author.name}')
            await member.remove_roles(members)
            
            await conn.close()

            msg = f"{member} has been restricted until {fmt_date}."
            embed = discord.Embed(title="Restricted", description=msg, colour=author.color)
            await ctx.send(embed=embed)
            return

Answer 1

你在处理SQL查询时不传递f-strings中的参数，asyncpg中查询参数的语法是$n，我也看到了您正在使用 Connection.fetch 方法，但您只是在更新 table，我建议您使用 Connection.execute

您的代码已修复：

end_date = # Should be a datetime.datetime instance
await conn.execute("""
    UPDATE blacklist 
    SET time =  
    WHERE username = 
""", end_date, member.id)

删除时区感知

end_date = # `datetime.datetime` instance
naive = end_date.replace(tzinfo=None)
await conn.execute("""
    UPDATE blacklist 
    SET time =  
    WHERE username = 
""", naive, member.id)

参考文献：

Connection.execute

PS：不要每次要用就新建一个连接，正常的做法是有一个长期的数据库连接

Asyncpg INSERT query for timestamp returns ERROR syntax error at or near "18"

Asyncpg INSERT query for timestamp returns ERROR syntax error at or near "18"

python

postgresql

asyncpg

discord.py

参考文献：