使用 T-SQL 查询 XML 节点得到错误的结果集答案

【问题标题】：Querying XML nodes using T-SQL getting wrong result set使用 T-SQL 查询 XML 节点得到错误的结果集
【发布时间】：2022-01-18 04:16:31
【问题描述】：

我正在尝试从 XML 文件中提取记录，但我得到的记录不符合 WHERE 子句中的条件。

这是我的 T-SQL 代码：

DECLARE @StartLossDate date = '2018-12-15';
DECLARE @EndLossDate date = CONVERT(date,GETDATE());

SELECT @StartLossDate as StartLossDate, @EndLossDate as EndLossDate;

-- Get result set.
SELECT DISTINCT t.SysDate, t.PolicySysID, t.PolicyNo
    a.b.value('(LossDt)[1]','date') as LossDate
    , a.b.value('(ClaimNumber)[1]','varchar(max)') as ClaimNumber
    , d.e.value('(LossTypeCd)[1]','varchar(max)') as LossTypeCd
FROM #tempXMLRecords t
    CROSS APPLY t.xmlPlus.nodes('ISO/PassportSvcRs/Reports/Report/ReportData/ISO/PassportSvcRs/PassportInqRs/Match/Claim/Loss') as a(b)
    CROSS APPLY t.xmlPlus.nodes('ISO/PassportSvcRs/Reports/Report/ReportData/ISO/PassportSvcRs/PassportInqRs/Match/Claim/Payment') as d(e)
WHERE a.b.value('(LossDt)[1]','date') BETWEEN @StartLossDate AND @EndLossDate
AND d.e.value('(LossTypeCd)[1]','varchar(4)') = 'TOWL'
ORDER BY PolicySysID asc;

我得到的结果是：

上述 TOP 2 记录在 XML 中没有 TOWL 的 LossTypeCd。

任何帮助/指导将不胜感激。我想我对 CROSS APPLY 中的节点定义应该如何工作感到困惑。

这是我的 XML：

<ISO>
    <PassportSvcRs>
        <Reports>
          <Report>
            <ReportData>
              <ISO>
                <PassportSvcRs>
                  <PassportInqRs>
                    <Match>
                      <Claim>                       
                        <Loss>
                          <LossDt>2020-11-01</LossDt>
                          <ClaimNumber>7842198101J20110105</ClaimNumber>
                        </Loss>
                        <Payment>
                          <CoverageCd>TOWL</CoverageCd>
                          <LossTypeCd>TOWL</LossTypeCd>
                          <ClaimStatusCd>C</ClaimStatusCd>
                          <LossPaymentAmt>78</LossPaymentAmt>
                        </Payment>
                      </Claim>
                    </Match>
                    <Match>
                      <Claim>
                        <Loss>
                          <LossDt>2020-10-28</LossDt>
                          <ClaimNumber>7842198101J20102805</ClaimNumber>
                        </Loss>
                        <Payment>
                          <CoverageCd>TOWL</CoverageCd>
                          <LossTypeCd>TOWL</LossTypeCd>
                          <ClaimStatusCd>C</ClaimStatusCd>
                          <LossPaymentAmt>78</LossPaymentAmt>
                        </Payment>
                      </Claim>
                    </Match>
                    <Match>
                      <Claim>
                        <Loss>
                          <LossDt>2020-10-03</LossDt>
                          <ClaimNumber>7842198101J20100305</ClaimNumber>
                        </Loss>
                        <Payment>
                          <CoverageCd>TOWL</CoverageCd>
                          <LossTypeCd>TOWL</LossTypeCd>
                          <ClaimStatusCd>C</ClaimStatusCd>
                          <LossPaymentAmt>78</LossPaymentAmt>
                        </Payment>                      
                      </Claim>
                    </Match>
                    <Match>
                      <Claim>
                        <Loss>
                          <LossDt>2019-10-21</LossDt>
                          <ClaimNumber>66203023279998</ClaimNumber>
                        </Loss>
                        <Payment>
                          <CoverageCd>COLL</CoverageCd>
                          <LossTypeCd>COLL</LossTypeCd>
                          <ClaimStatusCd>C</ClaimStatusCd>
                          <LossPaymentAmt>3963</LossPaymentAmt>
                        </Payment>                      
                      </Claim>
                    </Match>
                    <Match>
                      <Claim>
                        <Loss>
                          <LossDt>2019-05-26</LossDt>
                          <ClaimNumber>PTX19035829</ClaimNumber>
                        </Loss>
                        <Payment>
                          <CoverageCd>COMP</CoverageCd>
                          <LossTypeCd>COMP</LossTypeCd>
                          <ClaimStatusCd>C</ClaimStatusCd>
                          <LossPaymentAmt>0</LossPaymentAmt>
                        </Payment>
                      </Claim>
                    </Match>
                    <Match>
                      <Claim>
                        <Loss>
                          <LossDt>2018-10-16</LossDt>
                          <ClaimNumber>0522909605</ClaimNumber>
                        </Loss>
                        <Payment>
                          <CoverageCd>COLL</CoverageCd>
                          <LossTypeCd>COLL</LossTypeCd>
                          <ClaimStatusCd>C</ClaimStatusCd>
                          <LossPaymentAmt>0</LossPaymentAmt>
                        </Payment>
                        <Payment>
                          <CoverageCd>UM</CoverageCd>
                          <LossTypeCd>UM</LossTypeCd>
                          <ClaimStatusCd>C</ClaimStatusCd>
                          <LossPaymentAmt>0</LossPaymentAmt>
                        </Payment>
                      </Claim>
                    </Match>
                    <Match>
                      <Claim>
                        <Loss>
                          <LossDt>2017-11-05</LossDt>
                          <ClaimNumber>0481373215</ClaimNumber>
                        </Loss>
                        <Payment>
                          <CoverageCd>TOWL</CoverageCd>
                          <LossTypeCd>TOWL</LossTypeCd>
                          <ClaimStatusCd>C</ClaimStatusCd>
                          <LossPaymentAmt>23</LossPaymentAmt>
                        </Payment>
                      </Claim>
                    </Match>
                    <Match>
                      <Claim>
                        <Loss>
                          <LossDt>2017-10-07</LossDt>
                          <ClaimNumber>0478275043</ClaimNumber>
                        </Loss>
                        <Payment>
                          <CoverageCd>COLL</CoverageCd>
                          <LossTypeCd>COLL</LossTypeCd>
                          <ClaimStatusCd>C</ClaimStatusCd>
                          <LossPaymentAmt>2866</LossPaymentAmt>
                        </Payment>
                        <Payment>
                          <CoverageCd>RENT</CoverageCd>
                          <LossTypeCd>RENT</LossTypeCd>
                          <ClaimStatusCd>W</ClaimStatusCd>
                          <LossPaymentAmt>0</LossPaymentAmt>
                        </Payment>
                      </Claim>
                    </Match>
                    <Match>
                      <Claim>
                        <Loss>
                          <LossDt>2017-06-09</LossDt>
                          <ClaimNumber>JM177514</ClaimNumber>
                        </Loss>
                        <Payment>
                          <CoverageCd>COLL</CoverageCd>
                          <LossTypeCd>COLL</LossTypeCd>
                          <ClaimStatusCd>C</ClaimStatusCd>
                          <LossPaymentAmt>2374</LossPaymentAmt>
                        </Payment>
                      </Claim>
                    </Match>
                    <Match>
                      <Claim>
                        <Loss>
                          <LossDt>2016-01-16</LossDt>
                          <ClaimNumber>7842382435D16011605</ClaimNumber>
                        </Loss>
                        <Payment>
                          <CoverageCd>COLL</CoverageCd>
                          <LossTypeCd>COLL</LossTypeCd>
                          <ClaimStatusCd>C</ClaimStatusCd>
                          <LossPaymentAmt>4175</LossPaymentAmt>
                        </Payment>
                        <Payment>
                          <CoverageCd>RENT</CoverageCd>
                          <LossTypeCd>RENT</LossTypeCd>
                          <ClaimStatusCd>C</ClaimStatusCd>
                          <LossPaymentAmt>0</LossPaymentAmt>
                        </Payment>
                      </Claim>
                    </Match>
                  </PassportInqRs>
                </PassportSvcRs>
              </ISO>
            </ReportData>
          </Report>
        </Reports>
    </PassportSvcRs>
</ISO>

谢谢。

【问题讨论】：

没有示例 XML，我们无法在此告诉您太多信息。提供minimal reproducible example。
我不相信该查询包含确保付款数据和损失数据属于同一索赔的逻辑。也许您需要先在 CROSS APPLY 中选择 Claim 节点，然后从选定的 Claims 中选择 Loss/LossDate、Loss/ClaimNumber 和 Payment/LossTypeCd。
@TN，谢谢。我会试试的。欣赏这个建议。如果您不介意看一下，我只是附上了 XML。谢谢。
提问时，您需要提供minimal reproducible example： (1) DDL 和样本数据填充，即 CREATE 表加上 INSERT T-SQL 语句。 (2) 你需要做什么，即逻辑和你的代码尝试在 T-SQL 中实现它。 (3) 期望的输出，基于上述#1 中的样本数据。 (4) 您的 SQL Server 版本 (SELECT @@version;)。全部在问题内，没有图片。
知道了。感谢@YitzhakKhabinsky。

标签： sql-server xml tsql

【解决方案1】：

我不认为该查询包含确保付款数据和损失数据属于同一索赔的逻辑。

查看新发布的 XML，我发现索赔可能包含多笔付款，但（显然）只有一笔损失。您可能需要一个交叉申请来选择索赔，然后第二次交叉申请来选择与每个索赔相关的付款。

以下精简查询似乎有效。

DECLARE @Xml XML = '...' -- See posted XML above
DECLARE @tempXMLRecords TABLE(xmlPlus XML)
INSERT @tempXMLRecords VALUES (@Xml)
SELECT
    c.value('(Loss/LossDt)[1]','date') as LossDate
    , c.value('(Loss/ClaimNumber)[1]','varchar(max)') as ClaimNumber
    , p.value('(LossTypeCd)[1]','varchar(max)') as LossTypeCd
FROM @tempXMLRecords t
CROSS APPLY t.xmlPlus.nodes('ISO/PassportSvcRs/Reports/Report/ReportData/ISO/PassportSvcRs/PassportInqRs/Match/Claim') as C(c)
CROSS APPLY c.nodes('./Payment') as P(p)
ORDER BY 1,2,3

【讨论】：

您的建议正是我所做的。非常感谢您的时间和帮助。
好答案。根据 OP 的要求，您可能希望在第一个 .nodes 中有一个谓词，例如 Match/Claim[Payment/LossTypeCd[text() = "TOWL"]]。您可以只用c.nodes('Payment') 稍微缩短第二个。将/text() 添加到.value 函数将提高它们的性能。

【解决方案2】：

请尝试以下解决方案。

它支持一次索赔的多次付款。

当它发生时，LossTypeCd 列将有多个声明。

如果您不需要，可以很容易地调整该列中只有一个声明。

SQL

DECLARE @tbl TABLE (ID INT IDENTITY PRIMARY KEY, xmlPlus XML);
INSERT INTO @tbl (xmlPlus) VALUES
(N'<?xml version="1.0"?>
<ISO>
    <PassportSvcRs>
        <Reports>
            <Report>
                <ReportData>
                    <ISO>
                        <PassportSvcRs>
                            <PassportInqRs>
                                <Match>
                                    <Claim>
                                        <Loss>
                                            <LossDt>2020-11-01</LossDt>
                                            <ClaimNumber>7842198101J20110105</ClaimNumber>
                                        </Loss>
                                        <Payment>
                                            <CoverageCd>TOWL</CoverageCd>
                                            <LossTypeCd>TOWL</LossTypeCd>
                                            <ClaimStatusCd>C</ClaimStatusCd>
                                            <LossPaymentAmt>78</LossPaymentAmt>
                                        </Payment>
                                    </Claim>
                                </Match>
                                <Match>
                                    <Claim>
                                        <Loss>
                                            <LossDt>2020-10-28</LossDt>
                                            <ClaimNumber>7842198101J20102805</ClaimNumber>
                                        </Loss>
                                        <Payment>
                                            <CoverageCd>TOWL</CoverageCd>
                                            <LossTypeCd>TOWL</LossTypeCd>
                                            <ClaimStatusCd>C</ClaimStatusCd>
                                            <LossPaymentAmt>78</LossPaymentAmt>
                                        </Payment>
                                    </Claim>
                                </Match>
                                <Match>
                                    <Claim>
                                        <Loss>
                                            <LossDt>2020-10-03</LossDt>
                                            <ClaimNumber>7842198101J20100305</ClaimNumber>
                                        </Loss>
                                        <Payment>
                                            <CoverageCd>TOWL</CoverageCd>
                                            <LossTypeCd>TOWL</LossTypeCd>
                                            <ClaimStatusCd>C</ClaimStatusCd>
                                            <LossPaymentAmt>78</LossPaymentAmt>
                                        </Payment>
                                    </Claim>
                                </Match>
                                <Match>
                                    <Claim>
                                        <Loss>
                                            <LossDt>2019-10-21</LossDt>
                                            <ClaimNumber>66203023279998</ClaimNumber>
                                        </Loss>
                                        <Payment>
                                            <CoverageCd>COLL</CoverageCd>
                                            <LossTypeCd>COLL</LossTypeCd>
                                            <ClaimStatusCd>C</ClaimStatusCd>
                                            <LossPaymentAmt>3963</LossPaymentAmt>
                                        </Payment>
                                    </Claim>
                                </Match>
                                <Match>
                                    <Claim>
                                        <Loss>
                                            <LossDt>2019-05-26</LossDt>
                                            <ClaimNumber>PTX19035829</ClaimNumber>
                                        </Loss>
                                        <Payment>
                                            <CoverageCd>COMP</CoverageCd>
                                            <LossTypeCd>COMP</LossTypeCd>
                                            <ClaimStatusCd>C</ClaimStatusCd>
                                            <LossPaymentAmt>0</LossPaymentAmt>
                                        </Payment>
                                    </Claim>
                                </Match>
                                <Match>
                                    <Claim>
                                        <Loss>
                                            <LossDt>2018-10-16</LossDt>
                                            <ClaimNumber>0522909605</ClaimNumber>
                                        </Loss>
                                        <Payment>
                                            <CoverageCd>COLL</CoverageCd>
                                            <LossTypeCd>COLL</LossTypeCd>
                                            <ClaimStatusCd>C</ClaimStatusCd>
                                            <LossPaymentAmt>0</LossPaymentAmt>
                                        </Payment>
                                        <Payment>
                                            <CoverageCd>UM</CoverageCd>
                                            <LossTypeCd>UM</LossTypeCd>
                                            <ClaimStatusCd>C</ClaimStatusCd>
                                            <LossPaymentAmt>0</LossPaymentAmt>
                                        </Payment>
                                    </Claim>
                                </Match>
                                <Match>
                                    <Claim>
                                        <Loss>
                                            <LossDt>2017-11-05</LossDt>
                                            <ClaimNumber>0481373215</ClaimNumber>
                                        </Loss>
                                        <Payment>
                                            <CoverageCd>TOWL</CoverageCd>
                                            <LossTypeCd>TOWL</LossTypeCd>
                                            <ClaimStatusCd>C</ClaimStatusCd>
                                            <LossPaymentAmt>23</LossPaymentAmt>
                                        </Payment>
                                    </Claim>
                                </Match>
                                <Match>
                                    <Claim>
                                        <Loss>
                                            <LossDt>2017-10-07</LossDt>
                                            <ClaimNumber>0478275043</ClaimNumber>
                                        </Loss>
                                        <Payment>
                                            <CoverageCd>COLL</CoverageCd>
                                            <LossTypeCd>COLL</LossTypeCd>
                                            <ClaimStatusCd>C</ClaimStatusCd>
                                            <LossPaymentAmt>2866</LossPaymentAmt>
                                        </Payment>
                                        <Payment>
                                            <CoverageCd>RENT</CoverageCd>
                                            <LossTypeCd>RENT</LossTypeCd>
                                            <ClaimStatusCd>W</ClaimStatusCd>
                                            <LossPaymentAmt>0</LossPaymentAmt>
                                        </Payment>
                                    </Claim>
                                </Match>
                                <Match>
                                    <Claim>
                                        <Loss>
                                            <LossDt>2017-06-09</LossDt>
                                            <ClaimNumber>JM177514</ClaimNumber>
                                        </Loss>
                                        <Payment>
                                            <CoverageCd>COLL</CoverageCd>
                                            <LossTypeCd>COLL</LossTypeCd>
                                            <ClaimStatusCd>C</ClaimStatusCd>
                                            <LossPaymentAmt>2374</LossPaymentAmt>
                                        </Payment>
                                    </Claim>
                                </Match>
                                <Match>
                                    <Claim>
                                        <Loss>
                                            <LossDt>2016-01-16</LossDt>
                                            <ClaimNumber>7842382435D16011605</ClaimNumber>
                                        </Loss>
                                        <Payment>
                                            <CoverageCd>COLL</CoverageCd>
                                            <LossTypeCd>COLL</LossTypeCd>
                                            <ClaimStatusCd>C</ClaimStatusCd>
                                            <LossPaymentAmt>4175</LossPaymentAmt>
                                        </Payment>
                                        <Payment>
                                            <CoverageCd>RENT</CoverageCd>
                                            <LossTypeCd>RENT</LossTypeCd>
                                            <ClaimStatusCd>C</ClaimStatusCd>
                                            <LossPaymentAmt>0</LossPaymentAmt>
                                        </Payment>
                                    </Claim>
                                </Match>
                            </PassportInqRs>
                        </PassportSvcRs>
                    </ISO>
                </ReportData>
            </Report>
        </Reports>
    </PassportSvcRs>
</ISO>');
-- DDL and sample data population, end

DECLARE @StartLossDate DATE = '2018-12-15'
    , @EndLossDate DATE = CAST(GETDATE() AS DATE);

SELECT ID
    , c.value('(Loss/LossDt/text())[1]', 'DATE') AS LossDate
    , c.value('(Loss/ClaimNumber/text())[1]', 'VARCHAR(100)') AS ClaimNumber
    , c.query('data(Payment/LossTypeCd)').value('.', 'VARCHAR(100)') AS LossTypeCd
FROM @tbl
    CROSS APPLY xmlplus.nodes('/ISO/PassportSvcRs/Reports/Report/ReportData/ISO/PassportSvcRs/PassportInqRs/Match/Claim') AS t(c)
WHERE c.value('(Loss/LossDt/text())[1]', 'DATE') BETWEEN @StartLossDate AND @EndLossDate
    AND c.exist('Payment/LossTypeCd[./text()="TOWL"]') = 1;

输出

+----+------------+---------------------+------------+
| ID |  LossDate  |     ClaimNumber     | LossTypeCd |
+----+------------+---------------------+------------+
|  1 | 2020-11-01 | 7842198101J20110105 | TOWL       |
|  1 | 2020-10-28 | 7842198101J20102805 | TOWL       |
|  1 | 2020-10-03 | 7842198101J20100305 | TOWL       |
+----+------------+---------------------+------------+

【讨论】：

感谢您花时间发帖。感谢您的帮助。
@Melinda，您的最低分母是 Payment/LossTypeCd 吗？我为此使用了 ClaimNumber。
@DaleK，我做到了。谢谢
正如@TN 所建议的，Claim 是我使用的。我必须在 XML 中上一层才能获得所有相关数据。我不确定为什么我的问题是-1。我猜它没用（？）。
我认为它在您添加示例数据之前被否决了，并且投反对票的人可能还没有回来并看到您对其进行了改进。