ASP.NET Tutorial/ADO.net Database/OdbcCommand
Create OdbcCommand and execute it (C#)
<source lang="csharp">
<%@ Page Language="C#" %> <%@ import Namespace="System.Data" %> <%@ import Namespace="System.Data.Odbc" %> <script runat="server">
void Page_Load(object sender, EventArgs e) {
if (!Page.IsPostBack)
{
string ConnectionString = ConfigurationSettings.AppSettings["MySQLConnectString"];
OdbcConnection myConnection = new OdbcConnection(ConnectionString);
try{
string CommandTextPublisher = "SELECT PublisherID, PublisherName FROM Publisher";
OdbcCommand myCommandPublishers = new OdbcCommand(CommandTextPublisher, myConnection);
myConnection.Open();
DropDownList1.DataSource = myCommandPublishers.ExecuteReader();
DropDownList1.DataTextField = "PublisherName";
DropDownList1.DataValueField = "PublisherID";
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) {
string ConnectionString = ConfigurationSettings.AppSettings["MySQLConnectString"];
OdbcConnection myConnection = new OdbcConnection(ConnectionString);
try{
string CommandTextBooks = "SELECT Book.BookTitle, Publisher.PublisherName FROM Book INNER JOIN Publisher on Book.BookPublisherID = Publisher.PublisherID";
string filterValue = DropDownList1.SelectedValue;
if (filterValue != "0")
CommandTextBooks += " WHERE Book.BookPublisherID = " + filterValue;
CommandTextBooks+=" ORDER BY Book.BookTitle";
OdbcCommand myCommandBooks = new OdbcCommand(CommandTextBooks, myConnection);
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" CellSpacing="1" GridLines="None" CellPadding="3" BackColor="White" ForeColor="Black" EnableViewState="False">
<HeaderStyle font-bold="True" forecolor="white" backcolor="#4A3C8C"></HeaderStyle>
<ItemStyle backcolor="#DEDFDE"></ItemStyle>
</asp:datagrid>
</form>
</body> </html> File: Web.config <configuration>
<appSettings>
<add key="MySQLConnectString" value="driver={MySQL ODBC 3.51 Driver};server=localhost;database=Books;uid=YourID;pwd=letmein;" />
</appSettings>
</configuration></source>
OdbcCommand and OdbcParameter
<source lang="csharp">
<%@ Page Language="C#" %> <%@ import Namespace="System.Data" %> <%@ import Namespace="System.Data.Odbc" %> <script runat="server">
void Page_Load(object sender, EventArgs e) {
if (!Page.IsPostBack)
{
OdbcConnection myConnection = new OdbcConnection(@"driver={MySQL ODBC 3.51 Driver};server=localhost;database=books;uid=user;pwd=letmein;");
try{
string CommandTextPublisher = "SELECT PublisherID, PublisherName FROM Publisher";
OdbcCommand myCommandPublishers = new OdbcCommand(CommandTextPublisher, myConnection);
myConnection.Open();
DropDownList1.DataSource = myCommandPublishers.ExecuteReader();
DropDownList1.DataTextField = "PublisherName";
DropDownList1.DataValueField = "PublisherID";
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) {
OdbcConnection myConnection = new OdbcConnection(@"driver={MySQL ODBC 3.51 Driver};server=localhost;database=books;uid=user;pwd=letmein;");
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";
OdbcCommand myCommandBooks = new OdbcCommand(CommandTextBooks, myConnection);
OdbcParameter myParameter1 = new OdbcParameter();
myParameter1.ParameterName = "@pub1";
myParameter1.OdbcType = OdbcType.Int;
myParameter1.Value = DropDownList1.SelectedValue;
myCommandBooks.Parameters.Add (myParameter1);
OdbcParameter myParameter2 = new OdbcParameter();
myParameter2.ParameterName = "@pub2";
myParameter2.OdbcType = OdbcType.Int;
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></source>
