查詢檢索的XML值在SQL

我在SQL表中的下列XML：查詢檢索的XML值在SQL

<SiteSurveyData> 
    <SurveyQuestionAnswers> 
    <QuestionGUID>61</QuestionGUID> 
    <Answer>XXXXXXX</Answer> 
    </SurveyQuestionAnswers> 
    <SurveyQuestionAnswers> 
    <QuestionGUID>62</QuestionGUID> 
    <Answer>XXX</Answer> 
    </SurveyQuestionAnswers> 
    <SurveyQuestionAnswers> 
    <QuestionGUID>64</QuestionGUID> 
    <Answer>Both</Answer> 
    </SurveyQuestionAnswers> 
    <SurveyQuestionAnswers> 
    <QuestionGUID>63</QuestionGUID> 
    <Answer>aal5snap</Answer> 
    </SurveyQuestionAnswers> 
    <SurveyQuestionAnswers> 
    <QuestionGUID>81</QuestionGUID> 
    <Answer>00</Answer> 
    </SurveyQuestionAnswers>

什麼我想查詢的是，我想在/應答的值，其中/ QuestionGUID = 61和62

我嘗試使用這樣的：

value('(/SiteSurveyData/SurveyQuestionAnswers/QuestionGUID)[1]'

，但它只是返回第一個QuestionGUID。
我如何編寫查詢以便它返回QuestionGUID 61和62的答案？

或者我只想爲QuestionGuid = 61得到答案。
它並不總是第一個元素，是否可以編寫查詢以便返回QuestionGuid = 61的值？

來源

2017-08-15 user2665372

您可能需要使用遊標。這是一個示例https://stackoverflow.com/questions/19034382/sql-2012-iterate-through-an-xml-list-better-alternative-to-a-while-loop – Si8

如果我只想要所有的與問題= 61返回？它不一定總是第一個。 – user2665372

DECLARE @t TABLE(id INT IDENTITY(1,1),x XML); 
INSERT INTO @t(x)VALUES('<SiteSurveyData> 
    <SurveyQuestionAnswers> 
    <QuestionGUID>61</QuestionGUID> 
    <Answer>XXXXXXX</Answer> 
    </SurveyQuestionAnswers> 
    <SurveyQuestionAnswers> 
    <QuestionGUID>62</QuestionGUID> 
    <Answer>XXX</Answer> 
    </SurveyQuestionAnswers> 
    <SurveyQuestionAnswers> 
    <QuestionGUID>64</QuestionGUID> 
    <Answer>Both</Answer> 
    </SurveyQuestionAnswers> 
    <SurveyQuestionAnswers> 
    <QuestionGUID>63</QuestionGUID> 
    <Answer>aal5snap</Answer> 
    </SurveyQuestionAnswers> 
    <SurveyQuestionAnswers> 
    <QuestionGUID>81</QuestionGUID> 
    <Answer>00</Answer> 
    </SurveyQuestionAnswers></SiteSurveyData>'); 

SELECT 
    n.v.value('./QuestionGUID[1]','NVARCHAR(256)') AS QuestionGUID, 
    n.v.value('./Answer[1]','NVARCHAR(256)') AS Answer 
FROM 
    @t AS t 
    CROSS APPLY t.x.nodes('SiteSurveyData/SurveyQuestionAnswers[QuestionGUID="61" or QuestionGUID="62"]') AS n(v)

結果是你想要的（兩列XXXXXXX和XXX爲答案）。這適用XPath表達式尋找SurveyQuestionAnswers與QuestionGUID孩子的61或62.

來源

2017-08-15 17:17:09

n從哪裏來？ n.v.value？ – user2665372

@ user2665372當您使用返回節點的函數交叉應用時，您需要分配一個表別名和列別名。這就是節點功能之後的'AS n（v）'。 'n'是tabe別名，'v'是列別名。然後，由於'v'列是一個節點，所以你需要使用'value'函數從中提取一個值。因此'n.v.value（...）'將值函數應用於列「n.v」中的節點。 –

查詢檢索的XML值在SQL

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