в 15:30, 26 мая 2010

2010-05-26T15:30:57Z

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2010-05-26T11:56:56Z

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== 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>

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ASP.NET Tutorial/ADO.net Database/OdbcCommand - История изменений

в 15:30, 26 мая 2010

Admin: 1 версия