Материал из .Net Framework эксперт
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OleCommand and OleParameter
<%@ Page Language="C#" %>
<%@ import Namespace="System.Data" %>
<%@ import Namespace="System.Data.OleDb" %>
<script runat="server">
void Page_Load(object sender, EventArgs e) {
if (!Page.IsPostBack)
{
OleDbConnection myConnection = new OleDbConnection("PROVIDER=Microsoft.Jet.OLEDB.4.0;DATA SOURCE="+ Server.MapPath("EmployeeDatabase.mdb;"));
try{
string CommandTextPublisher = "SELECT ID, FirstName FROM Employee";
OleDbCommand myCommandPublishers = new OleDbCommand(CommandTextPublisher, myConnection);
myConnection.Open();
DropDownList1.DataSource = myCommandPublishers.ExecuteReader();
DropDownList1.DataTextField = "FirstName";
DropDownList1.DataValueField = "ID";
DropDownList1.DataBind();
DropDownList1.Items.Insert(0, new ListItem("-- All Publishers --", "0"));
}
catch (Exception ex){
throw(ex);
}
finally{
myConnection.Close();
}
}
}
void ApplyFilter_Click(Object sender, EventArgs e) {
OleDbConnection myConnection = new OleDbConnection("PROVIDER=Microsoft.Jet.OLEDB.4.0;DATA SOURCE="+ Server.MapPath("EmployeeDatabase.mdb;"));
try{
string CommandTextBooks = "SELECT Book.BookTitle, Publisher.PublisherName FROM Book INNER JOIN Publisher on Book.BookPublisherID = Publisher.PublisherID WHERE ?=0 OR Book.BookPublisherID=? ORDER BY Book.BookTitle";
OleDbCommand myCommandBooks = new OleDbCommand(CommandTextBooks, myConnection);
OleDbParameter myParameter1 = new OleDbParameter();
myParameter1.ParameterName = "@pub1";
myParameter1.OleDbType = OleDbType.Integer;
myParameter1.Value = DropDownList1.SelectedValue;
myCommandBooks.Parameters.Add (myParameter1);
OleDbParameter myParameter2 = new OleDbParameter();
myParameter2.ParameterName = "@pub2";
myParameter2.OleDbType = OleDbType.Integer;
myParameter2.Value = DropDownList1.SelectedValue;
myCommandBooks.Parameters.Add (myParameter2);
myConnection.Open();
DataGrid1.DataSource = myCommandBooks.ExecuteReader();
DataGrid1.DataBind();
}
catch (Exception ex){
throw(ex);
}
finally{
myConnection.Close();
}
}
</script>
<html>
<head>
</head>
<body>
<form runat="server">
Select a Publisher:
<asp:DropDownList id="DropDownList1" runat="server"></asp:DropDownList>
<asp:Button id="Button1" onclick="ApplyFilter_Click" runat="server" Text="Show Titles"></asp:Button>
<asp:datagrid id="DataGrid1" runat="server" EnableViewState="False">
<HeaderStyle font-bold="True" forecolor="white" backcolor="#4A3C8C"></HeaderStyle>
<ItemStyle backcolor="#DEDFDE"></ItemStyle>
</asp:datagrid>
</form>
</body>
</html>
