Pra-proses skema untuk menggabungkan skema yang disertakan

Berlaku untuk: SQL ServerAzure SQL Database Azure SQL Managed Instance

W3C XSD menyertakan elemen menyediakan dukungan untuk modularitas skema di mana skema XML dapat dipartisi menjadi lebih dari satu file fisik. SQL Server saat ini tidak mendukung elemen ini. Skema XML yang menyertakan elemen ini akan ditolak oleh server.

Sebagai solusi, skema XML yang menyertakan <xsd:include> direktif dapat diprosces sebelumnya untuk menyalin dan menggabungkan konten skema yang disertakan ke dalam satu skema untuk diunggah ke server. Kode C# berikut dapat digunakan untuk praproses. Komentar di bagian awal kode memberikan informasi tentang cara menggunakannya.

// XSD Schema Include Normalizer
// To compile:
// csc filename.cs
//
// How to use:
//
// Arguments: [-q] input.xsd [output.xsd]
//
// input.xsd       - file to normalize
// output.xsd      - file to output, default is console
// -q              - quiet
//
// Example:
//
// filename.exe schema.xsd
//
using System;
using System.Xml;
using System.Xml.Schema;
using System.IO;
using System.Collections;
public class XsdSchemaNormalizer
{
    private static bool NormalizeXmlSchema( String url, TextWriter writer )
    {
   try {
       XmlTextReader txtRead = new XmlTextReader( url );
       XmlSchema sch = XmlSchema.Read( txtRead, null );

       // Compiling Schema
       sch.Compile(null);

       XmlSchema outSch =
      XmlSchemaIncludeNormalizer.BuildIncludeFreeXmlSchema( sch);

       outSch.Write( writer );
   } catch ( Exception e ) {
       Console.WriteLine(e.ToString());
       return false;
   }
   return true;
    }
    public static void usage()
    {
   Console.WriteLine("Arguments: [-q] [-v] input.xsd [output.xsd]\n");
   Console.WriteLine("input.xsd       - file to normalize");
   Console.WriteLine("output.xsd      - file to output, default is console");
   Console.WriteLine("-q              - quiet");
    }
    public static void Main(String []args)
    {
   if( args.GetLength(0) < 1 ) {
       usage();
       return;
   }
   int argi = 0;
   bool quiet = false;
   if( args[argi] == "-q" ) {
       quiet = true;
            argi++;
   }

   if( argi == args.GetLength(0) )
   {
       usage();
       return;
   }

   String url = args[argi];

   if( !quiet )
       Console.WriteLine("Loading Schema: " + url);

   if( argi < ( args.GetLength(0) - 1 ) )
   {
       if( !quiet )
      Console.WriteLine("Outputing to file: " + args[argi+1]);

       StreamWriter output =
      new StreamWriter( new FileStream(args[argi+1], FileMode.Create ));

       NormalizeXmlSchema( url, output);
   }
   else
   {
       NormalizeXmlSchema( url, Console.Out);
   }

    }
}

// A class to remove all <include> from a Xml Schema
//
public class XmlSchemaIncludeNormalizer
{
    // Takes as input a XmlSchema which has includes in it
    // and the schema location uri of that XmlSchema
    //
    // Returns a "preprocessed" form of XmlSchema without any
    // includes. It still retains imports though. Also, it does
    // not propagate unhandled attributes
    //
    // It can throw any exception
    public static XmlSchema BuildIncludeFreeXmlSchema( XmlSchema inSch )
    {
   XmlSchema outSch = new XmlSchema();

   AddSchema( outSch, inSch );

   return outSch;
    }

    // Adds everything in the second schema minus includes to
    // the first schema
    //
    private static void AddSchema( XmlSchema outSch, XmlSchema add)
    {
   outSch.AttributeFormDefault = add.AttributeFormDefault;
   outSch.BlockDefault = add.BlockDefault;
   outSch.ElementFormDefault = add.ElementFormDefault;
   outSch.FinalDefault = add.FinalDefault;
   outSch.Id = add.Id;
   outSch.TargetNamespace = add.TargetNamespace;
   outSch.Version = add.Version;

   AddTableToSchema( outSch, add.AttributeGroups );
   AddTableToSchema( outSch, add.Attributes );
   AddTableToSchema( outSch, add.Elements );
   AddTableToSchema( outSch, add.Groups );
   AddTableToSchema( outSch, add.Notations );
   AddTableToSchema( outSch, add.SchemaTypes );

   // Handle includes as a special case
   for( int i = 0; i < add.Includes.Count; i++ )
   {
       if( ! ( add.Includes[i] is XmlSchemaInclude) )
      outSch.Includes.Add( add.Includes[i] );
   }
    }

    // Adds all items in the XmlSchemaObjectTable to the specified XmlSchema
    //
    private static void AddTableToSchema( XmlSchema outSch,
                 XmlSchemaObjectTable table )
    {
   IDictionaryEnumerator e = table.GetEnumerator();

   while( e.MoveNext() )
   {
       outSch.Items.Add( (XmlSchemaObject)e.Value );
   }
    }
}

Menguji alat prapemrosan

Anda dapat menggunakan skema XSD berikut untuk menguji alat praprosesor:

books_common.xsd

<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
     xmlns="bookstore-schema"
     elementFormDefault="qualified" >
  <xsd:element name="publisher" type="xsd:string"/>
</xsd:schema>

books.xsd

<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
     xmlns="bookstore-schema"
     elementFormDefault="qualified"
     targetNamespace="bookstore-schema">
  <xsd:include id="books_common" schemaLocation="books_common.xsd"/>
  <xsd:element name="bookstore" type="xsd:string" />
</xsd:schema>

Lihat juga

• Koleksi Skema XML (SQL Server)