Pa r a m e t e r izin g An y SQL Que r y in VB.NET

Maker DataMatrix in VB.NET Pa r a m e t e r izin g An y SQL Que r y

Pa r a m e t e r izin g An y SQL Que r y
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Just as you can param et er ize w hich XML docum ent you pr ocess, you can also ext end t he pr eceding sam ple t o param et er ize any quer y inst ead of j ust one specific query . The t rick t o t his t ask is t o pass bot h t he query and t he param et er value t o t he procedure t hat perform s t he query. I n t urn, t he procedure perform ing t he query m ust be adapt ed from t he preceding sam ple t o accept t hese param et ers and use t hem t o generat e a st ring for t he m essage box t hat displays result s at t he pr ocedur e s conclusion. The follow ing code block shows t he set up code t hat s r equir ed before calling t he procedur e t o run t he quer y and display it s result s in a m essage box. Not ice t hat t he set up code designat es a differ ent query t han t he sam ple in t he preceding sect ion. The query for t his sect ion is for t he Shippers t able, but t he one in t he preceding sect ion is for t he Cust om ers t able. Nevert heless, t he code t o ex ecut e t he quer y is nearly t he sam e in bot h sect ions. Mor e im port ant , you can ex ecut e a query for any t able or com binat ion of t ables w it hout changing t he RunSQLParam et er Query Wit hPassedParam s pr ocedur e. All y our applicat ion needs t o do is t o m ak e t w o assignm ent s one for t he st ring variable designat ing t he query ( st rSQL) and t he ot her for t he st r ing designat ing a param et er value ( st rPrm 1Value) . Dim strSQL As String = "SELECT * FROM Shippers " & _ "WHERE ShipperID = For XML Auto" Dim strPrm1Value As String = "1" RunSQLParameterQueryWithPassedParams( _ strSQL, strPrm1Value)
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The follow ing shows t he code for t he RunSQLParam et er Query Wit hPassedParam s procedur e. The lines t hat change from t he RunSQLParam et erQuer y pr ocedur e in t he preceding sect ion appear in bold. Not ice j ust four lines change. These are m ost ly for receiving and using t he passed st ring v ariables t hat specify t he query synt ax and t he param et er value. The Root Tag propert y assignm ent changes t o m ake it appropr iat e for any SQL query st r ing. Aside fr om t hese m inor changes, t here is not hing m or e t o updat ing t he ear lier pr ocedur e so t hat it can accom m odat e any SQL query st r ing. Sub RunSQLParameterQueryWithPassedParams( _ ByVal strSQL As String, _ ByVal strPrm1Value As String) Specify connection string for SqlXmlCommand. Dim cnn1String As String = _ "Provider=SQLOLEDB;Server=(local);" & _ "database=Northwind;" & _ "Integrated Security=SSPI" Specify connection for cmd1 SqlXmlCommand object Dim cmd1 As SqlXmlCommand = _ New Microsoft.Data.SqlXml.SqlXmlCommand(cnn1String) Designate data source for cmd1 with a parameter. cmd1.RootTag = "MyRoot" cmd1.CommandType = SqlXmlCommandType.Sql cmd1.CommandText = strSQL Create a parameter for cmd1 and assign it a value. Dim prm1 As SqlXmlParameter prm1 = (cmd1.CreateParameter()) prm1.Value = strPrm1Value Declare and instantiate a stream in memory and populate it with the XML result set from cmd1. Dim stm1 As New System.IO.MemoryStream() stm1 = cmd1.ExecuteStream() Copy result set in stream to a stream reader to display stream contents in a message box. Dim srd1 As New System.IO.StreamReader(stm1) MsgBox(srd1.ReadToEnd) srd1.Close() End Sub
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