в 15:30, 26 мая 2010

2010-05-26T15:30:47Z

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2010-05-26T11:50:52Z

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==Try Catch Finally for reading data from SQL server (VB.net)==



<source lang="csharp">
<%@ Page Language="VB" %>
<%@ Import Namespace="System.Data" %>
<%@ Import Namespace="System.Data.SqlClient" %>
<html>
<title>Try-Catch-Finally Example</title>
<head>
<script runat="server">
Sub Page_Load()
" Dim ConnStr As String = "Data Source=(local)\NetSDK;" & _
" "Initial Catalog=Pubs;Trusted_Connection=True;"
Dim ConnStr As String = "Data Source=whsql-v08.prod.mesa1.secureserver.net;Initial Catalog=DB_49907;User ID=nfexuser;Password="password";"
Dim SQL As String = "SELECT ID, FirstName FROM Employee " & _
"WHERE ID IS NOT NULL"
Dim PubsConn As New SqlConnection(ConnStr)
Dim TitlesCmd As New SqlCommand(SQL, PubsConn)
Dim Titles As SqlDataReader
Try
PubsConn.Open()
Titles = TitlesCmd.ExecuteReader()
Output.Text = "<table>"
While Titles.Read()
Output.Text &= "<tr>"
Output.Text &= "<td>" & Titles.GetString(0) & "</td>"
" Output.Text &= "<td>$" & _
" Format(Titles.GetDecimal(1), "##0.00") & "</td>"
Output.Text &= "</tr>"
End While
Output.Text &= "</table>"
Catch sqlEx As SqlException
Response.Write("A SqlException has occurred.")
Catch ex As Exception
Response.Write("An Exception has occurred.")
Finally
If Not Titles Is Nothing Then
If Not Titles.IsClosed Then
Titles.Close()
End If
End If
If PubsConn.State = ConnectionState.Open Then
PubsConn.Close()
End If
End Try
Response.Write("<br/>The current connection state is: " & _
PubsConn.State.ToString() & ".")
End Sub
</script>
</head>
<body>
<h1>SqlDataReader Example</h1>
<asp:label id="Output" runat="server"/>
</body>
</html>

</source>

==Writing data from the connection with try and catch (C#)==



<source lang="csharp">
<%@ Import Namespace="System.Data" %>
<%@ Import Namespace="System.Data.OleDb" %>
<script Language="c#" runat="server">
void Page_Load()
{
string strConnection = "Provider=Microsoft.Jet.OleDb.4.0;";
// strConnection += @"Data Source=C:\Northwind.mdb";
strConnection += @"Data Source="+MapPath("EmployeeDatabase.mdb");
data_src.Text = strConnection;
string strSQL = "SELECT FirstName, LastName FROM Employee;";
DataSet objDataSet = new DataSet();
OleDbConnection objConnection = new OleDbConnection(strConnection);
OleDbDataAdapter objAdapter = new OleDbDataAdapter(strSQL, objConnection);
try
{
objAdapter.Fill(objDataSet, "Employees");
DataView objDataView = new DataView(objDataSet.Tables["Employees"]);
dgNameList.DataSource = objDataView;
dgNameList.DataBind();
}
catch (OleDbException objError)
{
if (objError.Message.Substring(0,21) == "Login failed for user")
{
divErrorReport.InnerHtml = "Problem with Log-in";
}
else if (objError.Message.Substring(0,19) == "Could not find file")
{
divErrorReport.InnerHtml =
"We could not find the MDB file that you asked for";
}
else
{
divErrorReport.InnerHtml = "<br />message - " + objError.Message;
divErrorReport.InnerHtml += "<br />source - " + objError.Source;
}
}
}
</script>
<html>
<body>
<h4>Writing data from the connection
<asp:label id="data_src" runat="server"/>
to the DataGrid control with error checking.</h4>
<div id="divErrorReport" runat="server"> </div>
<asp:datagrid id="dgNameList" runat="server" /><br />
</body>
</html>

</source>

<A href="http://www.nfex.ru/Code/ASPDownload/EmployeeDatabase.zip">EmployeeDatabase.zip( 10 k)</a>

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ASP.Net/ADO.net Database/Catch Exception - История изменений

в 15:30, 26 мая 2010

Admin: 1 версия