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When you use the various indexers of the DataSet and DataTable type, you can interact with the contained data in a straightforward but loosely typed manner. Recall that this approach requires you to treat the data as a tabular block of cells, as in this example: static void PrintDataWithIndxers(DataTable dt) { // Print the DataTable. for (int curRow = 0; curRow < dt.Rows.Count; curRow++) { for (int curCol = 0; curCol < dt.Columns.Count; curCol++) { Console.Write(dt.Rows[curRow][curCol].ToString() + "\t"); } Console.WriteLine(); } } The CreateDataReader() method of the DataTable type offers a second approach, where you can treat the data in the DataSet as a linear set of rows to be processed in a sequential manner. This allows you to apply a connected data reader programming model to a disconnected DataSet: static void PrintDataWithDataTableReader(DataTable dt) { // Get the DataTableReader type. DataTableReader dtReader = dt.CreateDataReader(); while (dtReader.Read()) { for (int i = 0; i < dtReader.FieldCount; i++) { Console.Write("{0}\t", dtReader.GetValue(i)); } Console.WriteLine(); } dtReader.Close(); } Finally, you can use a strongly typed DataSet to yield a code base that allows you to interact with data in the object using properties that map to the column names in the relational database. Using strongly typed objects allows you to author code such as the following: static void AddRowWithTypedDataSet() { InventoryTableAdapter invDA = new InventoryTableAdapter(); AutoLotDataSet.InventoryDataTable inv = invDA.GetData(); inv.AddInventoryRow(999, "Ford", "Yellow", "Sal"); invDA.Update(inv); }

Undo() At any time, you can determine the identity that your code is currently executing under by calling the WindowsIdentityGetCurrent() method Here s a function that uses this technique to determine the current identity and display the corresponding user name in a label on a web page: Private Sub DisplayIdentity() ' Get the identity under which the code is currently executing Dim identity As WindowsIdentity = WindowsIdentityGetCurrent() lblInfoText &= "Executing as: " & identityName & "<br/>" End Sub Using the method, you can create a simple test that impersonates the authenticated IIS identity and then reverts to the standard identity: Private Sub Page_Load(ByVal sender As Object, ByVal e As SystemEventArgs) If TypeOf User Is WindowsPrincipal Then DisplayIdentity() ' Impersonate the IIS identity Dim id As WindowsIdentity id = CType(UserIdentity, WindowsIdentity) Dim impersonateContext As WindowsImpersonationContext impersonateContext = id.

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While all of these approaches have their place, the LINQ to DataSet API provides yet another option to manipulate DataSet data using LINQ query expressions.

Impersonate() DisplayIdentity() ' Revert to the original ID as shown here impersonateContextUndo() DisplayIdentity() Else ' User isn't Windows authenticated ' Throw an error or take other steps End If End Sub Figure 22-18 shows the result..

Note You only use the LINQ to DataSet to apply LINQ queries to DataSet objects returned by a data adapter, but this has nothing to do with applying LINQ queries directly to the database engine itself. 23 will introduce you to LINQ to Entities and the ADO.NET Entity Framework, which provide a way to represent SQL queries as LINQ queries.

Summary

Now let's try to retrieve all users from our database using the standard JDBC and the DAO pattern. First create a package called, com.apress.flexjava.usermanager.model to store all your entities. Our POM file for now won t have any dependencies. Next, create an entity called User with the same properties as the database table users. package com.apress.flexjava.usermanager.model; public class User { private int userId; private String forename; private String surname; public User() {} public User(int userId, String forename, String surname){ this.userId = userId; this.forename = forename; this.surname = surname; } public User(String forename, String surname) { this.forename = forename; this.surname = surname; } public int getUserId() { return userId; } public void setUserId(int userId) { this.userId = userId; } public String getForename() { return forename; } public void setForename(String forename) { this.forename = forename; } public String getSurname() { return surname; }

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