如何在 SQL Server 中提取子字符串 [英] How to extract substring in SQL Server

问题描述

我有一个字段类似于 okbogkbogkbokgbokgobkgobkofkgbokfgbo&name=fokdofkd&okfaos

我想从数据中提取name = value.

如何以有效的方式使用 SQL Server 2008 做到这一点?谢谢

How can I do that using SQL Server 2008 in efficient way? thank you

推荐答案

试试这个

;
With MyTable as
(
    SELECT 'okbogkbogkbokgbokgobkgobkofkgbokfgbo&name=fokdofkd&okfaos' FullString
    UNION 
    SELECT 'fkgbokfgbo&name=fokdofkd&okfaos' FullString
    UNION 
    SELECT 'okbogkbogkbokgbok' FullString
),
PatternIndex as
(
    Select 
        FullString + '&' FullString, 
        CharIndex ('&name=', FullString) + 1 LocationOfEqualSign, 
        CharIndex ('&', FullString, CharIndex ('&name=', FullString)+1) as NextBreak
    from MyTable
),
SplitNameValue AS
(
    Select 
        FullString, 
        CASE 
            WHEN NextBreak <> 0 THEN 
            SubString (FullString, LocationOfEqualSign, NextBreak-LocationOfEqualSign) 
            ELSE '' END
        as NameValuePair
    From PatternIndex
)
SELECT * 
FROM SplitNameValue

退货

FullString                                                NameValuePair
--------------------------------------------------------- ---------------------------------------------------------
fkgbokfgbo&name=fokdofkd&okfaos                           name=fokdofkd
okbogkbogkbokgbok                                         
okbogkbogkbokgbokgobkgobkofkgbokfgbo&name=fokdofkd&okfaos name=fokdofkd

(3 row(s) affected)

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