在SQL Server 2005中解析QueryString [英] Parse QueryString in SQL Server 2005

问题描述

在SQL Server中是否有一种简单的方法来解析QueryString参数(例如foo = bar& temp = baz)?

Is there a simple way to parse QueryString parameters (e.g. foo=bar&temp=baz) in SQL Server?

最后，我需要一个带有名称/值对的表".

What I need in the end is a "table" with the name/value pairs.

| foo  | bar |
| temp | baz |

虽然在上面的示例中这很简单，但是如果字符串开始包含转义字符(例如％3D)，则变得更加困难，而在涉及UTF-8时，则变得更加困难.

While it would be simple in the above example it becomes harder if the strings start to contain escaped characters (e.g. %3D) and even tougher when UTF-8 is involved.

任何现有的解决方案?用于SQL Server的URLDecode的实现将是人间天堂.

Any existing solutions? An implementation of URLDecode for SQL Server would be heaven on earth.

推荐答案

因此，要解析查询字符串，只需在函数中使用CTE.这是代码.

So to parse the query string, just use a CTE in a function. Here is the code.

CREATE FUNCTION dbo.SplitQueryString (@s varchar(8000))
RETURNS table
AS
RETURN (
    WITH splitter_cte AS (
      SELECT CHARINDEX('&', @s) as pos, 0 as lastPos
      UNION ALL
      SELECT CHARINDEX('&', @s, pos + 1), pos
      FROM splitter_cte
      WHERE pos > 0
      ),
    pair_cte AS (
    SELECT chunk,
           CHARINDEX('=', chunk) as pos
    FROM (
        SELECT SUBSTRING(@s, lastPos + 1,
                         case when pos = 0 then 80000
                         else pos - lastPos -1 end) as chunk
        FROM splitter_cte) as t1
  )
    SELECT substring(chunk, 0, pos) as keyName,
           substring(chunk, pos+1, 8000) as keyValue
    FROM pair_cte
)
GO

declare @queryString varchar(2048)
set @queryString = 'foo=bar&temp=baz&key=value';
SELECT *
  FROM dbo.SplitQueryString(@queryString)
OPTION(MAXRECURSION 0);

运行时会产生以下输出.

when run produces the following output.

keyName  keyValue
-------  --------
foo      bar
temp     baz
key      value
(3 row(s) affected)

我相信这完全可以满足您的要求.

I believe that this will do exactly what you are asking.

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