问题描述
我有一个MS SQL DB,这是一个问题的边缘案例,如果有一个简单的方法可以做到这一点,我会感到惊讶。与类型varchar(255)的字段。它包含一个十六进制字符串,当你使用ascii解码器对它进行解码时,它实际上是一个Guid。我知道这听起来真的很奇怪,但这里有一个例子:
该字段的内容:38353334373838622D393030302D343732392D383436622D383161336634396339663931
它实际上代表了什么:8534788b-9000-4729-846b-81a3f49c9f91
我需要一种解码方法,只需将字段的内容更改为实际它代表的guid。我需要在T-SQL中这样做,我不能使用.Net(如果可以的话,这非常简单)。
$ b
UPDATE :有些人已经用可能在一次性语句中工作的方式做出了回应,我需要一种将它放入UPDATE语句的方法。
例如:UPDATE MyTable SET MyField = MyFunction(MyField)其中MyFunction是此问题的正确答案。 这个会给你你想要的东西.8534788b-9000-4729-846b-81a3f49c9f91
select CONVERT( varchar(36),
0x38353334373838622D393030302D343732392D383436622D383161336634396339663931)
您需要将该值转换为varbinary,然后转换回varchar
这里是使用动态SQL的一种方式
declare @v varchar(100)
select @v ='0x'+'38353334373838622D393030302D343732392D383436622D383161336634396339663931'
$ b $ exec('SELECT CONVERT(varchar(36),'+ @v +')')
This is such an edge-case of a question, I'd be surprised if there is an easy way to do this.
I have a MS SQL DB with a field of type varchar(255). It contains a hex string which is actually a Guid when you decode it using an ascii decoder. I know that sounds REALLY weird but here's an example:
The contents of the field: "38353334373838622D393030302D343732392D383436622D383161336634396339663931"
What it actually represents: "8534788b-9000-4729-846b-81a3f49c9f91"
I need a way to decode this, and just change the contents of the field to the actual guid it represents. I need to do this in T-SQL, I cannot use .Net (which if I could, that is remarkably simple).
UPDATE: Some people have responded with ways that may work in one-off statements, I need a way to put this into an UPDATE statement.
For example: UPDATE MyTable SET MyField = MyFunction(MyField)
Where MyFunction is the correct answer to this question.
this will give you what you want..8534788b-9000-4729-846b-81a3f49c9f91
select CONVERT(varchar(36),
0x38353334373838622D393030302D343732392D383436622D383161336634396339663931)
you need to convert the value to varbinary and then convert back to varchar
here is one way using dynamic SQL
declare @v varchar(100)
select @v = '0x' + '38353334373838622D393030302D343732392D383436622D383161336634396339663931'
exec ( 'SELECT CONVERT(varchar(36),' + @v + ')')
这篇关于varchar()中的十六进制字符实际上是ascii。需要解码它的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!