ASP.Net/ADO.net Database/SQLDataAdapter

Материал из .Net Framework эксперт
Перейти к: навигация, поиск

Bind Data from Sql Server (VB.net)

<%@ Page Language=VB Debug=true %>
<%@ Import Namespace="System.Data" %>
<%@ Import Namespace="System.Data.SQLClient" %>
<script runat=server>
Sub Page_Load(ByVal Sender as Object, ByVal E as EventArgs)
    Dim DBConn as SQLConnection
    Dim DBCommand As SQLDataAdapter
    Dim DSPageData as New DataSet
"        DBConn = New SQLConnection("server=localhost;" _
 "           & "Initial Catalog=TT;" _
  "          & "User Id=sa;" _
   "         & "Password=yourpassword;")
    DBConn = New SQLConnection("Data Source=whsql-v08.prod.mesa1.secureserver.net;Initial Catalog=DB_49907;User ID=nfexuser;Password="password";")
    DBCommand = New SQLDataAdapter _
        ("Select Count(ID) as TheCount " _
        & "from Employee", DBConn)
    DBCommand.Fill(DSPageData, _
        "EmpCount")
    DBCommand = New SQLDataAdapter _
        ("Select Max(Salary) as HighSal " _
        & "from Employee", DBConn)
    DBCommand.Fill(DSPageData, _
        "HighSal")
    lblMessage.Text = "Total Employees: " _
        & DSPageData.Tables("EmpCount"). _
        Rows(0).Item("TheCount") _
        & "<BR><BR>Highest Salary: " _
        & FormatCurrency(DSPageData.Tables("HighSal"). _
        Rows(0).Item("HighSal"))
End Sub
</SCRIPT>
<HTML>
<HEAD>
<TITLE>Values in an SQL Server Table</TITLE>
</HEAD>
<Body LEFTMARGIN="40">
<form runat="server">
<BR><BR>
<asp:label
    id="lblMessage"
    runat="Server"
/>
</form>
</BODY>
</HTML>



Get data in database through SqlDataAdapter (C#)

<%@ Page Language="C#" %>
<%@ Import Namespace="System.Data" %>
<%@ Import Namespace="System.Data.SqlClient" %>
<html>
   <title>DataSet Example</title>
   <head>
      <script runat="server">
         void Page_Load()
         {
            String ConnStr = "Data Source=whsql-v08.prod.mesa1.secureserver.net;Initial Catalog=DB_49907;User ID=nfexuser;Password="password";";
            String SQL = "SELECT ID, FirstName FROM Employee " 
               + "WHERE ID IS NOT NULL";
            SqlDataAdapter TitlesAdpt = new SqlDataAdapter(SQL, ConnStr);
            DataSet Titles = new DataSet();
            // No need to open or close the connection
            //   since the SqlDataAdapter will do this automatically.
            TitlesAdpt.Fill(Titles);
            Output.Text = "<table>";
            foreach (DataRow Title in Titles.Tables[0].Rows)
            {
               Output.Text += "<tr>";
               Output.Text += "<td>" + Title[0] + "</td>";
               Output.Text += "<td>" + String.Format("{0:c}", Title[1]) 
                  + "</td>";
               Output.Text += "</tr>";
            }
            Output.Text += "</table>";
         }
      </script>
   </head>
<body>
   <h1>DataSet Example</h1>
   <asp:label id="Output" runat="server"/>
</body>
</html>



Read data from SqlConnection (VB.net)

<%@ Page Language=VB Debug=true %>
<%@ Import Namespace="System.Data" %>
<%@ Import Namespace="System.Data.SQLClient" %>
<script runat=server>
Sub Page_Load(ByVal Sender as Object, ByVal E as EventArgs)
    If Not IsPostBack Then
        Dim DBConn as SQLConnection
        Dim DBCommand As SQLDataAdapter
        Dim DSPageData as New DataSet
"        DBConn = New SQLConnection("server=localhost;" _
 "           & "Initial Catalog=TT;" _
  "          & "User Id=sa;" _
   "         & "Password=yourpassword;")
        DBConn = New SQLConnection("Data Source=whsql-v08.prod.mesa1.secureserver.net;Initial Catalog=DB_49907;User ID=nfexuser;Password="password";")
        DBCommand = New SQLDataAdapter _
            ("Select LastName + ", " + FirstName " _
            & "as EmpName, ID " _
            & "From Employee " _
            & "Order By LastName, FirstName", DBConn)
        DBCommand.Fill(DSPageData, _
            "Employees")
        ddlEmps.DataSource = _
            DSPageData.Tables("Employees").DefaultView
        ddlEmps.DataBind()
    End If
End Sub
</SCRIPT>
<HTML>
<HEAD>
<TITLE>Displaying SQL Server Data in a DropDownList Control</TITLE>
</HEAD>
<Body LEFTMARGIN="40">
<form runat="server">
<BR><BR>
<asp:dropdownlist
    id="ddlEmps"
    datatextfield="EmpName" 
    datavaluefield="ID"
    runat="server"
/>
</form>
</BODY>
</HTML>



Retrieving SQL Server Data (VB.net)

<%@ Page Language=VB Debug=true %>
<%@ Import Namespace="System.Data" %>
<%@ Import Namespace="System.Data.SQLClient" %>
<script runat=server>
Sub Page_Load(ByVal Sender as Object, ByVal E as EventArgs)
    If Not IsPostBack Then
        Dim DBConn as SQLConnection
        Dim DBCommand As SQLDataAdapter
        Dim DSPageData as New DataSet
"        DBConn = New SQLConnection("server=localhost;" _
 "           & "Initial Catalog=TT;" _
  "          & "User Id=sa;" _
   "         & "Password=yourpassword;")
        DBConn = New SQLConnection("Data Source=whsql-v08.prod.mesa1.secureserver.net;Initial Catalog=DB_49907;User ID=nfexuser;Password="password";")
    
        DBCommand = New SQLDataAdapter _
            ("Select LastName + ", " + FirstName " _
            & "as EmpName, ID " _
            & "From Employee " _
            & "Order By LastName, FirstName", DBConn)
        DBCommand.Fill(DSPageData, _
            "EmployeeNames")
        DBCommand = New SQLDataAdapter _
            ("Select * from Employee", DBConn)
        DBCommand.Fill(DSPageData, _
            "EmployeesAll")
        DBCommand = New SQLDataAdapter _
            ("Select LastName from Employee Where " _
            & "Salary > 25000", DBConn)
        DBCommand.Fill(DSPageData, _
            "Emp3")
        ddlEmps.DataSource = _
            DSPageData.Tables("EmployeeNames").DefaultView
        ddlEmps.DataBind()
        dgEmps2.DataSource = _
            DSPageData.Tables("EmployeesAll").DefaultView
        dgEmps2.DataBind()
        dgEmps3.DataSource = _
            DSPageData.Tables("Emp3").DefaultView
        dgEmps3.DataBind()
    End If
End Sub
</SCRIPT>
<HTML>
<HEAD>
<TITLE>Retrieving SQL Server Data</TITLE>
</HEAD>
<Body LEFTMARGIN="40">
<form runat="server">
<BR><BR>
<asp:dropdownlist
    id="ddlEmps"
    datatextfield="EmpName" 
    datavaluefield="ID"
    runat="server"
/>
<BR><BR>
<asp:datagrid
    id="dgEmps2" 
    runat="server" 
    autogeneratecolumns="True"
>
</asp:datagrid>
<BR><BR>
<asp:datagrid
    id="dgEmps3" 
    runat="server" 
    autogeneratecolumns="True"
>
</asp:datagrid>
</form>
</BODY>
</HTML>
Источник — «http://nfex.ru/index.php?title=ASP.Net/ADO.net_Database/SQLDataAdapter&oldid=1565»