📄 parameter-stored-proc.aspx
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<%@Page Language="VB"%>
<%@Import Namespace="System.Data" %>
<%@Import Namespace="System.Data.OleDb" %>
<%@ Register TagPrefix="wrox" TagName="connect" Src="..\global\connect-strings.ascx" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html><head>
<title>Using Explicit Parameters with a Stored Procedure</title>
<!-- #include file="..\global\style.inc" -->
</head>
<body bgcolor="#ffffff">
<span class="heading">Using Explicit Parameters with a Stored Procedure</span><hr />
<!--------------------------------------------------------------------------->
<%'-- insert connection string script --%>
<wrox:connect id="ctlConnectStrings" runat="server"/>
<div>Connection string: <b><span id="outConnect" runat="server"></span></b></div>
<div>Command Text: <b><span id="outCommandText" runat="server"></span></b></div>
<div>Input Parameter: <b><span id="outInParams" runat="server"></span></b></div>
<div>Output Parameters: <b><span id="outOutParams" runat="server"></span></b></div>
<div id="outError" runat="server"> </div>
<script language="vb" runat="server">
Sub Page_Load()
'get connection string from ..\global\connect-strings.ascx user control
Dim strConnect = ctlConnectStrings.OLEDBConnectionString
outConnect.InnerText = strConnect 'and display it
'specify the name of the stored procedure to use as the CommandText
Dim strCommandText As String = "FindFromISBN"
outCommandText.InnerText = strCommandText 'and display it
'create a new Connection object using the connection string
Dim objConnect As New OleDbConnection(strConnect)
'create a new Command object and set the CommandType
Dim objCommand As New OleDbCommand(strCommandText, objConnect)
objCommand.CommandType = CommandType.StoredProcedure
'create a variable to hold a Parameter object
Dim objParam As OleDbParameter
'create a new Parameter object named 'ISBN' with the correct data
'type to match a SQL database 'varchar' field of 12 characters
objParam = objCommand.Parameters.Add("ISBN", OleDbType.VarChar, 12)
'specify that it's an Input parameter and set the value
objParam.Direction = ParameterDirection.Input
objParam.Value = "1861002882"
'create a new Parameter object named 'Title' with the correct data
'type to match a SQL database 'varchar' field of 50 characters
'and specify that it's an output parameter (so no value required)
objParam = objCommand.Parameters.Add("Title", OleDbType.VarChar, 50)
objParam.Direction = ParameterDirection.Output
'create another output Parameter object named 'Date' with the correct
'data type to match a SQL database 'datetime' field
objParam = objCommand.Parameters.Add("Date", OleDbType.DBDate)
objParam.Direction = ParameterDirection.Output
'display the value of the input parameter
outInParams.InnerText = "ISBN='" & objCommand.Parameters("ISBN").Value & "'"
Try
'open the connection and execute the command
objConnect.Open()
objCommand.ExecuteNonQuery()
objConnect.Close() 'then close the connection
Catch objError As Exception
'display error details
outError.innerHTML = "<b>* Error while accessing data</b>.<br />" _
& objError.Message & "<br />" & objError.Source
Exit Sub ' and stop execution
End Try
'collect the values of the output parameters - note the use of
'the ToString method as they will contain DBNull if there was no
'match for the ISBN and this will cause an error if displayed
Dim strTitle = objCommand.Parameters("Title").Value.ToString()
Dim strDate = objCommand.Parameters("Date").Value.ToString()
outOutParams.InnerHtml = "Title='" & strTitle & "' Date=" & strDate
End Sub
</script>
<!--------------------------------------------------------------------------->
<!-- #include file="..\global\foot.inc" -->
</body>
</html>
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