15: Modifying Databases Using SQLXML in .NET

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15: Modifying Databases Using SQLXML
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The application loops through the XML elements of the response and writes them to the screen. It differentiates between data set and error and writes them separately. In the case of a function that returns a scalar value, or a stored procedure that returns a value as a data set, you can add the following code in the Select Case statement:
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Case "System.Int32" iReturn = objResponse(iElem) Console.WriteLine("Return Value: " & iReturn)
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This is probably the easiest case to code. The proxy method returns a data set that you can use to fill any data-bound control such as a grid:
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'SqlXml_Soap_SingleDateSet Public Class Form1 Inherits System.Windows.Forms.Form #Region " Windows Form Designer generated code " Private Sub Button1_Click(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles Button1.Click Dim iReturn As Integer Dim dsResponse As DataSet Dim objWSProxy As New AssetOrdersService.AssetOrders() objWSProxy.Credentials = System.Net.CredentialCache.DefaultCredentials dsResponse = objWSProxy.prOrderItemByOrderId_List(CInt(TextBox1.Text), _ iReturn) 'load it to grid gridTable.DataSource = dsResponse.Tables(0).DefaultView End Sub End Class
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SQL Server 2000 Stored Procedure & XML Programming
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Since the proxy method returns a DataSet object, the return value of the stored procedure has to be returned as a parameter of the proxy method.
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In this case, you have to combine approaches from the preceding two examples. You will be able to extract data sets and use them to populate grids, but first you have to parse XML elements to find them. Look for "System.Data.DataSet" to identify the XML element with data set information:
'SqlXml_Soap_DateSetArray Public Class frmOrders Inherits System.Windows.Forms.Form #Region " Windows Form Designer generated code " Private Sub btnLoad_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnLoad.Click Dim iReturn As Integer Dim dsResponse As DataSet Dim objResponse As Object() Dim objError As Object Dim iElem As Integer Dim objResponseElement As System.Xml.XmlElement Dim objWSProxy As New AssetOrdersService.AssetOrders() objWSProxy.Credentials = System.Net.CredentialCache.DefaultCredentials objResponse = objWSProxy.prOrderRequestedBy_List(txtUserName.Text) For iElem = 0 To objResponse.GetUpperBound(0) Select Case objResponse(iElem).GetType().ToString() Case "System.Data.DataSet" dsResponse = objResponse(iElem) ... grdOrders.DataSource = dsResponse.Tables(0).DefaultView() ... grdOrderItems.DataSource = dsResponse.Tables(0).DefaultView() ... Case "System.Int32" iReturn = objResponse(iElem) Console.WriteLine("Return Value: " & iReturn) Case "SqlMessage" objError = objResponse(iElem)
15: Modifying Databases Using SQLXML
MsgBox(objError.Message) Stop End Select Next End Sub End Class
The application gets two data sets from the web service and uses them to populate grids on the form.
NOTE
Visual Studio .NET is not the only tool that you can use to create SOAP clients. You can use Microsoft s SOAP Toolkit to create COM-based SOAP clients using Visual Studio 6. There is also an Office XP SOAP Toolkit that you can use to create VBA applications.
'SqlXml_Soap_DateSetArray Public Class frmOrders Inherits System.Windows.Forms.Form #Region " Windows Form Designer generated code " Private Sub btnLoad_Click(ByVal sender As System.Object, _ ByVal e As System.EventArgs) _ Handles btnLoad.Click Dim iReturn As Integer Dim dsResponse Dim dtOrderItems As DataTable Dim objResponse As Object() Dim objError As Object Dim iElem As Integer Dim dsOrderItems As DataSet Dim objResponseElement As System.Xml.XmlElement Dim objWSProxy As New AssetOrdersService.AssetOrders() objWSProxy.Credentials = System.Net.CredentialCache.DefaultCredentials objResponse = objWSProxy.prOrderRequestedBy_List(txtUserName.Text) For iElem = 0 To objResponse.GetUpperBound(0) Select Case objResponse(iElem).GetType().ToString() Case "System.Data.DataSet" 'put both tables in dsResponse If dsResponse Is Nothing Then 'process Orders dsResponse = objResponse(iElem)
SQL Server 2000 Stored Procedure & XML Programming
dsResponse.Tables(0).TableName = "Orders" Else 'process OrderItems dsOrderItems = objResponse(iElem) dtOrderItems = dsOrderItems.Tables(0) dsOrderItems.Tables.Remove(dtOrderItems) dsResponse.Tables.Add(dtOrderItems) 'link tables Dim custOrderRel As DataRelation =_ dsResponse.Relations.Add("OrderItems", _ dsResponse.Tables(0).Columns("OrderID"), _ dsResponse.Tables(1).Columns("OrderID")) 'assign new datasets to grids grdOrders.DataSource = dsResponse '.Tables(0).DefaultView() grdOrders.DataMember = "Orders" grdOrderItems.DataSource = dsResponse grdOrderItems.DataMember = "Orders.OrderItems" End If Case "System.Int32" iReturn = objResponse(iElem) Console.WriteLine("Return Value: " & iReturn) Case "SqlXml_Soap_DatasetArray.AssetOrdersService.SqlMessage" objError = objResponse(iElem) MsgBox(objError.Message) End End Select Next End Sub End Class
APPENDIX
T-SQL and XML Data Types in SQL Server 2000
SQL Server 2000 Stored Procedure & XML Programming
n this appendix, you will find four tables that provide an overview of the data types in use in SQL Server 2000. Table A-1 lists all Transact-SQL data types, their synonyms, their most important attributes (range and size), as well as sample constants. Table A-2 lists XML data types that you can use in XDR schemas. Table A-3 provides a mapping between Transact-SQL and XML (XDR) data types. Table A-4 lists XSD Schema built-in data types.
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