T-SQL 基於值與 XML 路徑組合

Question

我陷入了無法解決的問題。 我有一些模擬數據來模擬：

DECLARE @tbl TABLE (orderReference VARCHAR(50), shipmentReference VARCHAR(50), additionalComments VARCHAR(200))
DECLARE @finalXML XML

INSERT INTO @tbl
VALUES 
('1234567890', 'shipmentRef1', 'Some additional text'),
('1234567890', 'shipmentRef2', 'Some additional text for shipment ref 2'),
('0987654321', 'shipmentRef999', 'Some additional text for shipment ref 999')

1 個包含 3 列的表格（orderReference、shipmentReference 和 additionalComments）：

訂單參考	出貨參考	補充評論
1234567890	裝運編號 1	一些額外的文字
1234567890	裝運編號 2	一些額外的文本參考 2
0987654321	裝運編號999	裝運編號 999 的一些附加文本

使用此表，我正在創建一個新的 XML 變量來構建我將要使用的消息：

SET @finalXML = (
    SELECT
    "description" = 'This is on top level',
    "transportbookings" = (
        SELECT
            "Order_reference" = i.orderReference,
            "shipments" = (
                    SELECT  
                    "reference" = i.shipmentReference
                FOR XML PATH('shipment'), TYPE
            )
            FROM @tbl i
        FOR XML PATH('transportbooking'), TYPE
    
    )   
    FOR XML PATH ('import'), TYPE
)

此時它正在創建一個 XML，如下所示：

<import>
  <description>This is on top level</description>
  <transportbookings>
    <transportbooking>
      <Order_reference>0987654321</Order_reference>
      <shipments>
        <shipment>
          <reference>shipmentRef999</reference>
        </shipment>
      </shipments>
    </transportbooking>
    <transportbooking>
      <Order_reference>1234567890</Order_reference>
      <shipments>
        <shipment>
          <reference>shipmentRef1</reference>
        </shipment>
      </shipments>
    </transportbooking>
    <transportbooking>
      <Order_reference>1234567890</Order_reference>
      <shipments>
        <shipment>
          <reference>shipmentRef2</reference>
        </shipment>
      </shipments>
    </transportbooking>
  </transportbookings>
</import>

我試圖實現有 2 個基於“orderReference”值的“transportbooking”元素。 因此它需要為“1234567890”創建 1 個“transportbooking”元素，其中包含 2 個“shipments”元素。

所以預期的 output 應該是：

<import>
  <description>This is on top level</description>
  <transportbookings>
    <transportbooking>
      <Order_reference>0987654321</Order_reference>
      <shipments>
        <shipment>
          <reference>shipmentRef999</reference>
        </shipment>
      </shipments>
    </transportbooking>
    <transportbooking>
      <Order_reference>1234567890</Order_reference>
      <shipments>
        <shipment>
          <reference>shipmentRef1</reference>
        </shipment>
        <shipment>
          <reference>shipmentRef2</reference>
        </shipment>
      </shipments>
    </transportbooking>
  </transportbookings>
</import>

我嘗試使用外部應用，將“FROM @tbl i”移動到另一個元素，嘗試“GROUP BY”orderReference 列。

我手忙腳亂，有沒有人為我開眼界？

Answer 1

請嘗試以下解決方案。

SQL

DECLARE @tbl TABLE (orderReference VARCHAR(50), shipmentReference VARCHAR(50), additionalComments VARCHAR(200));
INSERT INTO @tbl VALUES 
('1234567890', 'shipmentRef1', 'Some additional text'),
('1234567890', 'shipmentRef2', 'Some additional text for shipment ref 2'),
('0987654321', 'shipmentRef999', 'Some additional text for shipment ref 999');

DECLARE @finalXML XML = 
(SELECT 'This is on top level' AS [description]
, (
    SELECT p.orderReference AS [Order_reference]
    , (SELECT c.shipmentReference AS [reference] 
        FROM @tbl AS c
        WHERE p.orderReference = c.orderReference
        FOR XML PATH('shipment'), TYPE, ROOT('shipments'))
FROM @tbl AS p
GROUP BY orderReference
FOR XML PATH('transportbooking'), TYPE, ROOT('transportbookings'))
FOR XML PATH(''), TYPE, ROOT('import'));

-- test
SELECT @finalXML;

Output XML

<import>
  <description>This is on top level</description>
  <transportbookings>
    <transportbooking>
      <Order_reference>0987654321</Order_reference>
      <shipments>
        <shipment>
          <reference>shipmentRef999</reference>
        </shipment>
      </shipments>
    </transportbooking>
    <transportbooking>
      <Order_reference>1234567890</Order_reference>
      <shipments>
        <shipment>
          <reference>shipmentRef1</reference>
        </shipment>
        <shipment>
          <reference>shipmentRef2</reference>
        </shipment>
      </shipments>
    </transportbooking>
  </transportbookings>
</import>