Question

我有一个查询，我在sql中使用XML.modify将新节点插入到我的xml doc中

但是，我打印这个XML，我看到我的XML文档已更新，但没有任何内容保存在我的数据库中

我是否需要更新脚本才能使更改生效？（数据库中的列是text类型，但我将其转换为XML

Answer 1

您可以按照以下方式修改列：

from pynput import keyboard
import pyaudio
import wave

CHUNK = 8192
FORMAT = pyaudio.paInt16
CHANNELS = 2
RATE = 44100
WAVE_OUTPUT_FILENAME = "output.wav"

class MyListener(keyboard.Listener):
    def __enter__(self):
        self.p = pyaudio.PyAudio()
        self.stream = self.p.open(format=FORMAT,
                             channels=CHANNELS,
                             rate=RATE,
                             input=True,
                             frames_per_buffer=CHUNK,
                             stream_callback = self.callback)
        self.start()
        return self
    def __init__(self):
        super(MyListener, self).__init__(on_press=self.on_press, on_release=self.on_release)
        self.key_pressed = False
        self.complete_tag = False
        self.frames = []

    def on_press(self, key):
        if key == keyboard.Key.space:
            self.key_pressed = True

    def on_release(self, key):
        if key == keyboard.Key.space:
            self.key_pressed = False
            self.complete = True
        if key == keyboard.Key.esc:
            return False

    def callback(self,in_data, frame_count, time_info, status):
        callback_flag = pyaudio.paContinue
        if self.key_pressed:
            self.frames.append(in_data)
        if self.complete_tag:
            callback_flag = pyaudio.paComplete
        return in_data, callback_flag

    def __exit__(self, exc_type, exc_value, traceback):
        self.stream.stop_stream()
        self.stream.close()
        self.p.terminate()
        self.stop()
        wf = wave.open(WAVE_OUTPUT_FILENAME, 'wb')
        wf.setnchannels(CHANNELS)
        wf.setsampwidth(self.p.get_sample_size(FORMAT))
        wf.setframerate(RATE)
        wf.writeframes(b''.join(self.frames))
        wf.close()

with MyListener() as listener:
        listener.join()

但是如果您将文档复制到变量，则必须按如下方式更新：

create table #t( id int, doc xml)
insert into #t(id,doc) values (1,'<a><b/></a>')

update #t set doc.modify( 'delete /a/b' ) where id = 1 

select doc from #t

将XML节点保存回我的表中

1 个答案: