XML Web Service 数据交换

客户端调用服务器端的 Web 服务并传递包含数据的 DataSet (ds)：

Private Sub Synchronize()

    Dim username As String = "JohnS"

    Dim blnSuccess As Boolean

    ' 使用 XML Web Service 进行同步

    Cursor.Current = Cursors.WaitCursor

    Dim wsFeedback As New wsFeedback.feedback

    blnSuccess = wsFeedback.InsertFeedback(ds, username)

    Cursor.Current = Cursors.Default

End Sub

服务器端的 Web 服务接受 DataSet 并将 XML 直接传递到 SQL Server 2000 存储的过程中，该过程使用 SQLXML（英文）和 OPENXML 解析 XML 并将新数据插入适当的表格。

<WebMethod()> _

Public Function InsertFeedback(ByVal ds As DataSet, ByVal username As

  String) As Boolean

    Dim con As New SqlConnection(connectionstring)

    Dim cmd As New SqlCommand("p_Feedback_i", con)

    cmd.CommandType = CommandType.StoredProcedure

    ' 设置参数

    Dim prmXML As SqlParameter = cmd.Parameters.Add("@XML",

      SqlDbType.NText)

    prmXML.Direction = ParameterDirection.Input

    prmXML.Value = ds.GetXml

    Dim prmUsername As SqlParameter = cmd.Parameters.Add("@Username",

      SqlDbType.NVarChar)

    prmUsername.Direction = ParameterDirection.Input

    prmUsername.Value = username

    Try

    con.Open()

        cmd.ExecuteNonQuery()

    Catch ex As Exception

        ' 处理、记录并重掷错误

        Throw ex

    Finally

        con.Close()

    End Try

    Return True

End Function

The stored procedure inserts the new data:

CREATE PROCEDURE p_Feedback_i

   @XML ntext,

   @Username nvarchar(50)

AS

SET NOCOUNT ON

DECLARE @iDoc   integer

DECLARE @Error   integer

/* Create XML document. */

EXEC sp_xml_preparedocument @iDoc OUTPUT, @XML

/* Insert new records */

INSERT INTO    Feedback

      (

      FeedbackID,

      PlantSection,

      Part,

      DefectScope,

      ScopeID,

      DefectType,

      RichInk,

      Username

      )

SELECT     ID,

      PlantSection,

      Part,

      DefectScope,

      ScopeID,

      DefectType,

      RichInk,

      @Username

FROM OPENXML (@iDoc, '/DataSet/Feedback',2) WITH

      (

      ID   uniqueidentifier,

      PlantSection   int,

      Part      int,

      DefectScope   int,

      ScopeID   nvarchar(50),

      DefectType   int,

      RichInk      nvarchar(50)

      )

SELECT @Error = @@ERROR

IF (@Error <> 0)

BEGIN

   GOTO Errorhandler

END

/* Remove the XML document*/

EXEC sp_xml_removedocument @iDoc

RETURN

Errorhandler:

IF NOT @iDoc IS NULL

   EXEC sp_xml_removedocument @iDoc

RAISERROR (@Error,16,1)

RETURN