当文本变长时，MySQL替换函数不起作用

我有一个表（实际上是由WordPress生成的）。我想使用

replace

函数替换一些文本，但它不起作用

字段中的文本：

这段文字完全是从字段中复制的，我试着这样做：

UPDATE wp_posts
  SET post_content =
  REPLACE(
    post_content,
    'the above text',
    'some new text'
  )
  WHERE ID = 1;

没有行受影响，但是当我减少文本时，让我们说我为

做了什么，如您所见

Ans查看是否有任何结果。
否我使用
选择
没有得到任何结果。我现在该怎么办？正如我所说，这就是你问题的原因。。根据mysql版本的不同，您可以使用其他方法REG_REPLACE。。。。尽量减少更改，以便更好地找到您的模式。在大多数情况下，这种大规模的替换需要大量的实验和多次测试，所以尝试创建一个具有代表性的示例，并尝试找到一个好的替换策略我有mysql 5.7我不明白它在myside上不起作用的确切原因是什么，我尝试将fiddle上的版本更改为5.7，它正在工作，但是当我输入查询时，它就不起作用了。hgas与版本替换无关，只会找到确切的单词当select显示nothing时，列中没有这样的数据。
Set @a = 'a<!-- wp:blocks/amazon-product {"url":"https://www.amazon.com/OutdoorMaster-OTG-Ski-Goggles-Protection/dp/B01HLV5HR6","category":"1","headline":"OutdoorMaster OTG Ski Goggles - Over Glasses Ski/Snowboard Goggles for Men, Women \u0026 Youth - 100% UV Protection (Black Frame + VLT 10% Grey Lens with REVO Silver)","price":"$17.99","review":"",","checkPrice":"Buy Now on Amazon","isUrlPresent":true,"cacheDate":"2020-04-05T07:27:27.875Z"} /-->"a'

✓
SELECT REPLACE (@a,'<!-- wp:blocks/amazon-product {"url":"https://www.amazon.com/OutdoorMaster-OTG-Ski-Goggles-Protection/dp/B01HLV5HR6","category":"1","headline":"OutdoorMaster OTG Ski Goggles - Over Glasses Ski/Snowboard Goggles for Men, Women \u0026 Youth - 100% UV Protection (Black Frame + VLT 10% Grey Lens with REVO Silver)","price":"$17.99","review":"",","checkPrice":"Buy Now on Amazon","isUrlPresent":true,"cacheDate":"2020-04-05T07:27:27.875Z"} /-->','test')

| REPLACE (@a,'<!-- wp:blocks/amazon-product {"url":"https://www.amazon.com/OutdoorMaster-OTG-Ski-Goggles-Protection/dp/B01HLV5HR6","category":"1","headline":"OutdoorMaster OTG Ski Goggles - Over Glasses Ski/Snowboard Goggles for Men, Women \u0026 Youth - 1 |
| :-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| atest"a                                                                                                                                                                                                                                                         |
SELECT post_content FROM wp_posts WHERE post_content LIKE '%your text%';