从SQL Server 2016检索复杂的XML

Question

给定这些表：

DECLARE @Documents TABLE
(
    document_id int,
    document_file varchar(200),
    description varchar(200),
    pages int,
    write_barcode bit
)

DECLARE @Data TABLE
(
    id int,
    tax_id varchar(100),
    bo_lgl_name varchar(200),
    document_id int,
    keydata varchar(100),
    field_name varchar(100),
    value varchar(100)
)

填充此数据：

INSERT INTO @Data VALUES (1, '123456789', 'Fred Flintstone', 269, Null, 'LastName', 'Smith')
INSERT INTO @Data VALUES (1, '123456789', 'Fred Flintstone', 269, Null, 'FirstName', 'Joe')
INSERT INTO @Data VALUES (1, '123456789', 'Fred Flintstone', 6, Null, 'TaxID', '123456789')
INSERT INTO @Data VALUES (1, '123456789', 'Fred Flintstone', 6, Null, 'Address', 'New York')

INSERT INTO @Data VALUES (2, '666666666', 'Barney Rubble', 269, Null, 'LastName', 'Jones')
INSERT INTO @Data VALUES (2, '666666666', 'Barney Rubble', 269, Null, 'FirstName', 'Fred')
INSERT INTO @Data VALUES (2, '666666666', 'Barney Rubble', 6, Null, 'TaxID', '987654321')
INSERT INTO @Data VALUES (2, '666666666', 'Barney Rubble', 6, Null, 'Address', 'Los Angeles')

INSERT INTO @Documents VALUES  (269, '8802.pdf', Null, Null, Null)
INSERT INTO @Documents VALUES  (6, 'Doclist.xsl', Null, Null, Null)

我正在尝试检索此XML：

<Documents>
  <Batch BatchID="1" BatchName="Fred Flintstone">
    <DocCollection>
      <Document DocumentID="269" FileName="8802.pdf" KeyData="">
        <MergeFields>
          <MergeField FieldName="LastName" Value="Smith" />
          <MergeField FieldName="LastName" Value="Joe" />
          <MergeField FieldName="TaxID" Value="123456789" />
          <MergeField FieldName="Address" Value="New York" />
        </MergeFields>
      </Document>
      <Document DocumentID="6" FileName="Doclist.xsl" KeyData="">
        <MergeFields>
          <MergeField FieldName="LastName" Value="Smith" />
          <MergeField FieldName="LastName" Value="Joe" />
          <MergeField FieldName="TaxID" Value="123456789" />
          <MergeField FieldName="Address" Value="New York" />
        </MergeFields>
      </Document>
    </DocCollection>
  </Batch>
  <Batch BatchID="2" BatchName="Barney Rubble">
    <DocCollection>
      <Document DocumentID="269" FileName="8802.pdf" KeyData="">
        <MergeFields>
          <MergeField FieldName="LastName" Value="Smith" />
          <MergeField FieldName="LastName" Value="Joe" />
          <MergeField FieldName="TaxID" Value="123456789" />
          <MergeField FieldName="Address" Value="New York" />
        </MergeFields>
      </Document>
      <Document DocumentID="6" FileName="Doclist.xsl" KeyData="">
        <MergeFields>
          <MergeField FieldName="LastName" Value="Smith" />
          <MergeField FieldName="LastName" Value="Joe" />
          <MergeField FieldName="TaxID" Value="123456789" />
          <MergeField FieldName="Address" Value="New York" />
        </MergeFields>
      </Document>
    </DocCollection>
  </Batch>
</Documents>

到目前为止，这是我la脚而可悲的SQL尝试：

SELECT t.id AS '@BatchID', t.bo_lgl_name AS '@BatchName',
    (

        SELECT
            t.document_id AS '@DocumentID',
            d.description AS '@DocName',
            ISNULL(t.KeyData, '') AS '@KeyData',
            (
                SELECT
                    t.document_id AS '@FieldName',
                    d.description AS '@Value'
                FROM @Data t2
                INNER JOIN @Documents d2 ON t2.document_id = d1.document_id
                WHERE t2.id = t1.id AND t2.document_id = t1.document_id
                FOR XML PATH('MergeField')
            ) AS 'MergeField'
        FROM @Data t1
        INNER JOIN @Documents d1 ON t1.document_id = d.document_id
        WHERE t1.id = t.id
        FOR XML PATH('Document'), TYPE

    ) AS 'DocCollection'
FROM @Data t
INNER JOIN @Documents d ON t.document_id = d.document_id
WHERE value IS NOT NULL
ORDER BY t.id, t.document_id
FOR XML PATH('Batch'), ROOT('Documents')

这让我部分到达那里，但在将标签分组到每个标题下时开始崩溃。 不知道它是否在我的SQL或其他中的JOIN。 在此之前，我从未尝试过使用SQL和XML进行如此复杂的操作，因此这很愚蠢。

我究竟做错了什么？

谢谢

卡尔

Answer 1

这应该使您更接近：

SELECT t.id AS '@BatchID', t.bo_lgl_name AS '@BatchName',
    (

        SELECT  
            t1.document_id AS '@DocumentID',
            d.description AS '@DocName',
            d.document_file as '@FileName',
            isnull(t1.keydata,'') as '@KeyData',
            (
                SELECT
                    t2.field_name AS '@FieldName',
                    t2.value AS '@Value'
                FROM @Data t2

                WHERE  t2.document_id = d.document_id
                FOR XML PATH('MergeField') , TYPE
            ) AS 'MergeField'
        FROM (SELECT DISTINCT document_id,id,keydata FROM @DATA) t1
        inner join @Documents d
        on d.document_id=t1.document_id and t.id=t1.id
        order by d.document_id
        FOR XML PATH('Document'), TYPE
    ) AS 'DocCollection'
FROM (select distinct id,bo_lgl_name from @Data where value is not null)  t
FOR XML PATH('Batch'), ROOT('Documents')

我不确定您要如何获得建议的输出。 计程车“ 123456789”标记有文档6，但您用文档269列出了吗？