ASP.NET Tutorial/ADO.net Database/Access — различия между версиями
Admin (обсуждение | вклад) м (1 версия) |
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Версия 18:30, 26 мая 2010
Содержание
Execute an insert statement on Access database
<source lang="csharp">
<%@ Page Language="C#" %> <%@ import Namespace="System.Data" %> <%@ import Namespace="System.Data.OleDb" %> <script runat="server">
void Page_Load(object sender, EventArgs e) {
string ConnectionString = ConfigurationSettings.AppSettings["AccessConnectString"];
OleDbConnection myConnection = new OleDbConnection(ConnectionString);
try{
string CommandText = "INSERT INTO Publisher (PublisherName, PublisherCity, PublisherContact_Email, PublisherWebsite) VALUES ("New Publisher", "Newcastle", "bigcheese@newpublish.ru", "http://www.newpublish.ru")";
OleDbCommand myCommand = new OleDbCommand(CommandText, myConnection);
myConnection.Open();
lblRecords.Text = Convert.ToString(myCommand.ExecuteNonQuery());
} catch (Exception ex){
throw(ex);
} finally{
myConnection.Close();
}
}
</script> <html> <head> </head> <body>
<form runat="server">
Records affected: <asp:Label id="lblRecords" runat="server"></asp:Label>
</form>
</body> </html> File: Web.config <configuration>
<appSettings>
<add key="AccessConnectString" value="Provider=Microsoft.Jet.OLEDB.4.0; Data Source=C:\Books.mdb;" />
</appSettings>
</configuration></source>
Execute an update statement against Access database
<source lang="csharp">
<%@ Page Language="C#" %> <%@ import Namespace="System.Data" %> <%@ import Namespace="System.Data.OleDb" %> <script runat="server">
void Page_Load(object sender, EventArgs e) {
string ConnectionString = ConfigurationSettings.AppSettings["AccessConnectString"];
OleDbConnection myConnection = new OleDbConnection(ConnectionString);
try{
string CommandText = "UPDATE Publisher Set PublisherName="Old Publisher", PublisherCity = "AAA" WHERE PublisherID = 6";
OleDbCommand myCommand = new OleDbCommand(CommandText, myConnection);
myConnection.Open();
lblRecords.Text = Convert.ToString(myCommand.ExecuteNonQuery());
} catch (Exception ex){
throw(ex);
} finally{
myConnection.Close();
}
}
</script> <html> <head> </head> <body>
<form runat="server">
Records affected: <asp:Label id="lblRecords" runat="server"></asp:Label>
</form>
</body> </html> File: Web.config <configuration>
<appSettings>
<add key="AccessConnectString" value="Provider=Microsoft.Jet.OLEDB.4.0; Data Source=C:\Books.mdb;" />
</appSettings>
</configuration></source>
Execute select statement against Access database
<source lang="csharp">
<%@ Page Language="C#" %> <%@ import Namespace="System.Data" %> <%@ import Namespace="System.Data.OleDb" %> <script runat="server">
void Page_Load(object sender, EventArgs e) {
string ConnectionString = ConfigurationSettings.AppSettings["AccessConnectString"];
string CommandText = "select PublisherID, PublisherName, PublisherCity, PublisherWebsite FROM Publisher ORDER BY PublisherID";
OleDbConnection myConnection = new OleDbConnection(ConnectionString);
OleDbCommand myCommand = new OleDbCommand(CommandText, myConnection);
myConnection.Open();
DataGrid1.DataSource = myCommand.ExecuteReader(CommandBehavior.CloseConnection);
DataGrid1.DataBind();
}
</script> <html> <head> </head> <body>
<form runat="server">
<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> File: Web.config <configuration>
<appSettings>
<add key="AccessConnectString" value="Provider=Microsoft.Jet.OLEDB.4.0; Data Source=C:\Books.mdb;" />
</appSettings>
</configuration></source>
Iterating Through A DataSet for Access database
<source lang="csharp">
<%@ Page Language="C#" %> <%@ import Namespace="System.Data" %> <%@ import Namespace="System.Data.OleDb" %> <script runat="server">
void Page_Load(object sender, EventArgs e)
{
string ConnectionString = Convert.ToString(ConfigurationSettings.AppSettings["AccessConnectString"]);
string CommandText = "SELECT AuthorName, AuthorCity, AuthorContact_Email, AuthorWebsite FROM Author";
OleDbConnection myConnection = new OleDbConnection(ConnectionString);
OleDbCommand myCommand = new OleDbCommand(CommandText, myConnection);
OleDbDataAdapter myAdapter = new OleDbDataAdapter();
myAdapter.SelectCommand = myCommand;
DataSet myDataSet = new DataSet();
try {
myConnection.Open();
myAdapter.Fill(myDataSet, "Author");
} catch (Exception ex) {
throw (ex);
} finally {
myConnection.Close();
}
for (int i=0; i<=myDataSet.Tables["Author"].Rows.Count-1; i++)
{
Author p = new Author();
p.Name = myDataSet.Tables["Author"].Rows[i]["AuthorName"].ToString();
p.City = myDataSet.Tables["Author"].Rows[i]["AuthorCity"].ToString();
p.Email = myDataSet.Tables["Author"].Rows[i]["AuthorContact_Email"].ToString();
p.Website = myDataSet.Tables["Author"].Rows[i]["AuthorWebsite"].ToString();
Label1.Text += p.ToString();
}
}
public class Author
{
public string Name;
public string City;
public string Email;
public string Website;
public Author()
{}
public string ToString()
{
string description = "";
description = "Name : " + this.Name + "
";
description += "City : " + this.City + "
";
description += "Contact : <a href=mailto:" + this.Email + ">" + this.Email + "</a>
";
description += "Homesite : <a href="" + this.Website + "">" + this.Website + "</a>
";
return description;
}
}
</script> <html> <body>
<asp:Label id="Label1" runat="server"></asp:Label>
</body> </html>
File: Web.config <configuration>
<appSettings>
<add key="AccessConnectString"
value="Provider=Microsoft.Jet.OLEDB.4.0; Data Source=Books.mdb;" />
</appSettings>
</configuration></source>
Read scalar data from Access database
<source lang="csharp">
<%@ Page Language="C#" %> <%@ import Namespace="System.Data" %> <%@ import Namespace="System.Data.OleDb" %> <script runat="server">
void Page_Load(object sender, EventArgs e) {
string ConnectionString = ConfigurationSettings.AppSettings["AccessConnectString"];
string CommandText = "select PublisherID, PublisherName, PublisherCity, PublisherWebsite FROM Publisher ORDER BY PublisherID";
OleDbConnection myConnection = new OleDbConnection(ConnectionString);
OleDbCommand myCommand = new OleDbCommand(CommandText, myConnection);
myConnection.Open();
string CommandTextCount = "SELECT COUNT(*) FROM Publisher";
OleDbCommand myCommandCount = new OleDbCommand(CommandTextCount, myConnection);
lblTotal.Text = Convert.ToString(myCommandCount.ExecuteScalar());
DataGrid1.DataSource = myCommand.ExecuteReader(CommandBehavior.CloseConnection);
DataGrid1.DataBind();
}
</script> <html> <head> </head> <body>
Publishers in the database: <asp:Label id="lblTotal" runat="server"></asp:Label>
<form runat="server">
<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> File: Web.config <configuration>
<appSettings>
<add key="AccessConnectString" value="Provider=Microsoft.Jet.OLEDB.4.0; Data Source=C:\Books.mdb;" />
</appSettings>
</configuration></source>
Set Connection to Access database (VB.net)
<source lang="csharp">
<%@ Page Language="VB" %> <%@ Import Namespace="System.Data" %> <%@ Import Namespace="System.Data.OleDB" %> <script runat="server">
sub Page_Load(Sender as Object, e as EventArgs)
dim myConnection as new OleDbConnection( _
"PROVIDER=Microsoft.Jet.OLEDB.4.0;" _
& "DATA SOURCE=" & Server.MapPath("EmployeeDatabase.mdb;"))
dim myCommand as OleDbDataAdapter = new OleDbDataAdapter("select * from employee", myConnection)
dim ds as DataSet = new DataSet()
myCommand.Fill(ds, "employee")
end sub
</script> <html><body>
<form runat="server"> </form>
</body></html></source>
