Подход для выполнения XSLT-преобразования на SQL Server

Question

Я пытаюсь выполнить XSLT-преобразование для преобразования XML в другой формат XML. Я также использую Xslt Extension Objects для выполнения операций отображения данных во время преобразования.

Я упомянул урезанную версию форматов XML ниже. В моей системе есть таблица сопоставления, которая отображает код продукта поставщика и ProductID. Поэтому при преобразовании я использую объекты расширения для выполнения таких операций отображения.

Это хорошо работает, пока я не получу большой XML-документ с парой тысяч узлов детализации. В таком случае объект расширения оказывает влияние на производительность.

Мне было интересно, могу ли я перенести XSLT-преобразование на SQL Server и обработать операцию отображения данных на уровне БД, а не делать отдельный вызов БД из объектов расширения?

Исходный документ XML

<SuppliersDocument>
  <SupplierProducts>
    <Product>
      <ProductCode>A001</ProductCode>
      <UOM>KG</UOM>
    </Product>
    <Product>
      <ProductCode>A002</ProductCode>
      <UOM>ML</UOM>
    </Product>
    <Product>
      <ProductCode>A003</ProductCode>
      <UOM>EA</UOM>
    </Product>
  </SupplierProducts>
</SuppliersDocument>

Целевой XML-документ

<MyDocument>
  <Products>
    <Product>
      <ProductID>998998</ProductID>
      <UnitOfMeasurementID>1</UnitOfMeasurementID>
    </Product>
    <Product>
      <ProductID>885855</ProductID>
      <UnitOfMeasurementID>2521</UnitOfMeasurementID>
    </Product>
    <Product>
      <ProductID>225235</ProductID>
      <UnitOfMeasurementID>5542</UnitOfMeasurementID>
    </Product>
  </Products>
</MyDocument>

Answer 1

C # код:

public partial class StoredProcedures{
    [Microsoft.SqlServer.Server.SqlProcedure]
    public static void CKTransfrom(out string resultXML, string inputXML, string transformXSL){
    XslCompiledTransform proc = new XslCompiledTransform();
    using (StringReader sr = new StringReader(transformXSL)){
        using (XmlReader xr = XmlReader.Create(sr)){
            proc.Load(xr);
        }
    }
    using (StringReader sr = new StringReader(inputXML)){
        using (XmlReader xr = XmlReader.Create(sr)){
            using (StringWriter sw = new StringWriter()){
                proc.Transform(xr, null, sw);
                resultXML = sw.ToString();
}}}}}

PowerShell

1. build dll

2. В PowerShell:

   x:>"0x" +[System.BitConverter]::ToString([System.IO.File]::ReadAllBytes("X:\StoredProcedures.dll")).Replace("-","")
   

T-SQL

3) в MS-SQL

EXEC sp_configure 'show advanced options', 1;
GO
RECONFIGURE;
GO
EXEC sp_configure 'clr strict security', 0;
GO
RECONFIGURE;
GO
sp_configure 'clr enabled', 1;
GO
RECONFIGURE
GO

CREATE ASSEMBLY StoredProcedures
FROM 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WITH PERMISSION_SET = SAFE;

4) create sp:

CREATE PROCEDURE usp_CKTransform(
    @resultXML nvarchar(1000) OUTPUT,
    @inputXML nvarchar(1000), 
    @transformXSL nvarchar(1000) 
    )
    AS EXTERNAL NAME  StoredProcedures.[StoredProcedures].CKTransfrom;
GO

5) попробовать

Declare  @resultXML nvarchar(1000);
Declare  @inputXML nvarchar(1000) = '
<catalog>
          <cd>
            <title>Empire Burlesque</title>
            <ärtist> Böb Dylan   </ärtist>
            <country>USA</country>
            <company>Columbia</company>
            <price>10.90</price>
            <year>1985</year>
          </cd>
          <cd>
            <title>Hide your heart</title>
            <ärtist> Bonnie Tyler       </ärtist>
            <country>UK</country>
            <company>CBS Records</company>
            <price>9.90</price>
            <year>1988</year>
          </cd>
        </catalog>';
Declare  @transformXSL nvarchar(1000) = '
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:template match="/">
<xsl:for-each select="catalog/cd">
  EXEC UPSERT_CDKektion Stevön!
  ''<xsl:value-of select="title"/>'',
  ''<xsl:value-of select="substring(ärtist,3,3)"/>'',
  ''<xsl:value-of select="country"/>'',
  ''<xsl:value-of select="company"/>'',
  <xsl:value-of select="price"/>,      
  ''<xsl:value-of select="year"/>'';
      </xsl:for-each>
    </xsl:template>
  </xsl:stylesheet>';
EXEC usp_CKTransform @resultXML out, @inputXML, @transformXSL;

6) наслаждайтесь результатом:

SELECT @resultXML;
EXEC PTJ_UPSERT_CDKektion Stevön! 'Empire Burlesque', 'öb ', 'USA', 'Columbia', 10.90, '1985';
EXEC PTJ_UPSERT_CDKektion Stevön! 'Hide your heart', 'onn', 'UK', 'CBS Records',        9.90, '1988';      

Answer 2

Для обработки больших XML-XSLT используйте NVARCHAR (MAX), изменив:

using System.Data.SqlTypes;
...
public static void CKTransfrom(out SqlString resultXML, SqlString inputXML, SqlString transformXSL)
...
using (StringReader sr = new StringReader(transformXSL.Value))
...
using (StringReader sr = new StringReader(inputXML.Value))
...

и

CREATE PROCEDURE usp_CKTransform
(
  @resultXML nvarchar(MAX) OUTPUT,
  @inputXML nvarchar(MAX), 
  @transformXSL nvarchar(MAX) 
)

и

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Answer 3

Если вы этого еще не сделали, вы должны сделать это в службах SSIS, а не в самом SQL Server.