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Module 10: Accessing Data with Microsoft ADO.NET

Overview ,[object Object],[object Object],[object Object],[object Object],[object Object]

Lesson: Introduction to Using ADO.NET ,[object Object],[object Object],[object Object]

Multimedia: The ADO.NET Object Model

Using DataSets vs. DataReaders Supported by Visual Studio .NET tools Slower access Forward-only Bind to one control only Based on one SQL statement from one database Read-only Manually coded Faster access Forward and backward scanning of data Bind to multiple controls Includes multiple tables from different databases Read/write access to data DataReader DataSet Disconnected Connected

Practice: When to Use DataSets or DataReaders ,[object Object],[object Object],[object Object]

Lesson: Connecting to a Database ,[object Object],[object Object],[object Object]

SQL Server Security Client Send the username and password in clear text. Do not send the username and password. Just send that the user has been authenticated. Mixed mode authentication Windows only authentication SQL Server Only ASPNET account is granted access Web Server Windows authentication or… SQL Server Each user account added to SQL Server logins group Web Server Default ASP.NET settings Here is the username and password

Creating the Connection ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Dim strConn As String = "data source=localhost; " & _ "initial catalog=northwind; integrated security=true" Dim conn As New SqlConnection(strConn) ,[object Object],[object Object],[object Object],[object Object],string strConn = "data source=localhost; " + "initial catalog=northwind; integrated security=true"; SqlConnection conn = new SqlConnection(strConn);

Demonstration: Setting SQL Server Security ,[object Object],[object Object],[object Object],[object Object]

Lesson: Accessing Data with DataSets ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Creating a DataAdapter ,[object Object],[object Object],[object Object],Dim da As New SqlDataAdapter _ ("select * from Authors", conn) da.SelectCommand.CommandText da.SelectCommand.Connection SqlDataAdapter da = new SqlDataAdapter ("select * from Authors",conn); da.SelectCommand.CommandText; da.SelectCommand.Connection;

Creating a DataSet ,[object Object],[object Object],[object Object],Dim ds As New DataSet() da.Fill(ds, "Authors") Dim r As DataRow Dim str As String For Each r in _ ds.Tables("Authors").Rows str &= r(2) str &= r("au_lname") Next ds.Tables("Authors").Rows.Count DataSet ds = new DataSet(); da.Fill(ds, "Authors"); ds.Tables["Authors"].Rows.Count; string str=""; foreach(DataRow r in ds.Tables["Authors"].Rows) { str += r[2]; str += r["au_lname"]; }

Demonstration: Programmatically Using a DataSet ,[object Object],[object Object],[object Object],[object Object]

Using a DataView ,[object Object],[object Object],[object Object],DataView dv = new DataView(ds.Tables["Authors"]); dv.RowFilter = "state = 'CA'"; Dim dv As DataView = ds.Tables("Authors").DefaultView Dim dv As New DataView (ds.Tables("Authors")) dv.RowFilter = "state = 'CA'" DataView dv = ds.Tables["Authors"].DefaultView;

Practice: Organizing Code to Create a DataSet ,[object Object],[object Object],[object Object]

Binding a DataSet to a List-Bound Control ,[object Object],[object Object],dg.DataSource = ds dg.DataMember = "Authors" dg.DataBind() <asp:DataGrid id="dg" runat="server" /> dg.DataSource = ds; dg.DataMember = "Authors"; dg.DataBind() ;

Instructor-Led Practice: Displaying a DataSet ,[object Object],[object Object],[object Object],[object Object],[object Object]

Handling Errors ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Code Example

Lesson: Using Multiple Tables ,[object Object],[object Object],[object Object],[object Object],[object Object]

Storing Multiple Tables ,[object Object],[object Object],daCustomers = New SqlDataAdapter _ ("select * from Customers", conn1) daCustomers.Fill(ds, "Customers") Orders Customers daOrders = New SqlDataAdapter _ ("select * from Orders", conn2) daOrders.Fill(ds, "Orders") conn2 conn1 DataSet

Creating Relationships ,[object Object],[object Object],[object Object],Dim dr As New DataRelation _ ("name", parentCol, _ childCol) ds.DataRelations.Add(dr) Dim parentCol As DataColumn = _ ds.Tables("Customers").Columns("CustomerID") Dim childCol As DataColumn = _ ds.Tables("Orders").Columns("CustomerID") Orders table Customers table DataSet parentCol childCol DataRelation C# Code Example

Programmatically Navigating Between Tables Using Relationships ds.Tables( index ).Rows( index ).GetChildRows(" relation ") ds.Tables( index ).Rows( index ).GetParentRow(" relation ") Customers Orders GetChildRows GetParentRow DataSet ds.Tables[ index ].Rows[ index] .GetChildRows(" relation "); ds.Tables[ index] .Rows[ index] .GetParentRow(" relation ");

Visually Navigating Between Tables Using Relationships Dim tableView As DataView Dim currentRowView As DataRowView tableView = New DataView(ds.Tables("Customers")) currentRowView = tableView(dgCustomers.SelectedIndex) dgChild.DataSource = currentRowView.CreateChildView("CustOrders") Customers Orders CreateChildView DataRowView DataView DataSet DataView tableView; DataRowView currentRowView; tableView = new DataView(ds.Tables["Customers"]); currentRowView = tableView[dgCustomers.SelectedIndex]; dgChild.DataSource = currentRowView.CreateChildView("CustOrders");

Instructor-Led Practice: Displaying Data from Multiple Tables ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Lesson: Accessing Data with DataReaders ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

What is a DataReader? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Creating a DataReader ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Code Example 1 2 3 4 5 6 7

Reading Data from a DataReader ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Do While myReader.Read() str &= myReader(1) str &= myReader("field") str &= myReader.GetDateTime(2) Loop while (myReader.Read()) { str += myReader[1]; str += myReader["field"]; str += myReader.GetDateTime(2); }

Binding a DataReader to a List-Bound Control ,[object Object],[object Object],dgAuthors.DataSource = dr dgAuthors.DataBind() <asp:DataGrid id="dgAuthors" runat="server" /> dgAuthors.DataSource = dr; dgAuthors.DataBind();

Practice: Organizing Code to Create a DataReader ,[object Object],[object Object],[object Object]

Demonstration: Displaying Data Using DataReaders ,[object Object],[object Object],[object Object],[object Object]

Review ,[object Object],[object Object],[object Object],[object Object],[object Object]

Lab 10: Accessing Data with Microsoft ADO.NET Medical Medical.aspx Benefits Home Page Default.aspx Life Insurance Life.aspx Retirement Retirement.aspx Dental Dental.aspx Dentists Doctors Doctors.aspx Doctors Logon Page Login.aspx Registration Register.aspx Coho Winery Prospectus Prospectus.aspx XML Web Service dentalService1.asmx Page Header Header.ascx ASPState tempdb Lab Web Application User Control namedate.ascx Menu Component Class1.vb or Class1.cs XML Files Web. config

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