Question

单个单元格将包含如下字符串：

[{"Code":"C015","Index":0,"Message":"blah blah blah","FailSeverity":2},{"Code":"W012","Index":0,"Message":"blah blah blah","FailSeverity":1}]

我有兴趣从上面的单个字符串中提取所有代码。 I.E.我想要＆＃34; C015＆＃34;和＆＃34; W012＆＃34;从上面的例子中没有别的。

我已经看过Substring（）函数，但我不太清楚如何在这种情况下实现它，或者我完全理解它是一个函数。

Answer 1

对于这样的事情，我认为你想要使用一个基于理货的字符串分割器功能。在这种情况下，我使用Jeff Moden的DelimitedSplit8K

DECLARE @String VARCHAR(8000) = '[{"Code":"C015","Index":0,"Message":"blah blah blah","FailSeverity":2},{"Code":"W012","Index":0,"Message":"blah blah blah","FailSeverity":1}]';

WITH 
    cte_GetCodes AS (
    SELECT 
        CodeValue = CASE WHEN LAG(dsk.Item, 2) OVER (ORDER BY dsk.ItemNumber) = 'Code' THEN dsk.Item END 
    FROM
        dbo.DelimitedSplit8K(@String, '"') dsk
    )
SELECT 
    *
FROM
    cte_GetCodes gc
WHERE 
    gc.CodeValue IS NOT NULL;

结果...

CodeValue
----------
C015
W012

子串SQL选择

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