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SqlParameter[] pUpdate = new SqlParameter[5]; pUpdate[0] = new SqlParameter("@fname", SqlDbType.VarChar); pUpdate[0].SourceColumn = "firstname"; pUpdate[1] = new SqlParameter("@lname", SqlDbType.VarChar); pUpdate[1].SourceColumn = "lastname"; pUpdate[2] = new SqlParameter("@phone", SqlDbType.VarChar); pUpdate[2].SourceColumn = "homephone"; pUpdate[3] = new SqlParameter("@notes", SqlDbType.VarChar); pUpdate[3].SourceColumn = "notes"; pUpdate[4] = new SqlParameter("@empid", SqlDbType.VarChar); pUpdate[4].SourceColumn = "employeeid"; foreach (SqlParameter p in pUpdate) { cmdUpdate.Parameters.Add(p); } SqlParameter[] pDelete = new SqlParameter[1]; pDelete[0] = new SqlParameter("@empid", SqlDbType.VarChar); pDelete[0].SourceColumn = "employeeid"; foreach (SqlParameter p in pDelete) { cmdDelete.Parameters.Add(p); } da.InsertCommand = cmdInsert; da.UpdateCommand = cmdUpdate; da.DeleteCommand = cmdDelete; da.Update(ds,"Employees"); ds.AcceptChanges(); } The code creates three SqlCommand objects for INSERT, UPDATE, and DELETE operations, respectively. The Connection property of these SqlCommand objects is set to the same SqlConnection object that we declared at the top initially. The CommandText property of each SqlCommand is set to the corresponding SQL statement. Note the use of the @ character to represent parameters. For each of these parameter placeholders, a SqlParameter object needs to be created. This is done by declaring three arrays of the SqlParameter class: pInsert, pUpdate, and pDelete.

CAUTION Our examples use the Kerberos v5 software from MIT, as this is the reference implementation of the standard. The example code would require changes to work with Microsoft Active Directory.

Finally, you will also want to check if a class implements an interface by calling the implementsInterface method on it. Note that you do the check on the class, not on instances of the class, so you cannot say MyBoat.implementsInterface(whatever). Instead you check it against the class, like this:

Proxy SSO, as the name suggests, uses a proxy system to carry out sign-ons for us. Users log into the portal with their username and password, and this in turn unlocks a store of usernames and passwords for external systems. The advantage of this system is that, as presented, it offers the same user experience as True SSO. However, it is something of a compromise and this can cause administrative problems.

Then each array element is instantiated as a SqlParameter object by passing the parameter name and parameter data type in the constructor of the SqlParameter class. The SourceColumn property of SqlParameter specifies the name of the DataColumn that will be supplying the value for the parameter. All the parameters from the corresponding arrays are added to the Parameters collection of the respective SqlCommand object. These three SqlCommand objects are assigned to the InsertCommand, UpdateCommand, and DeleteCommand properties of the SqlDataAdapter instance that we declared at the top. The Update() method of the SqlDataAdapter class is then called and takes all the changes inserts, updates, and deletes from the DataSet back to the database. The Update() method takes two parameters: the DataSet to be updated, and the name of the DataTable from the DataSet that is to be updated. After the changes are saved to the underlying database, the RowState properties of all the DataRow objects must become Unchanged. This is done by calling the AcceptChanges() method of the DataSet class. That s it! You can now run the application and test it for the expected functionality.

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alert(Vehicles.Boat.implementsInterface(Vehicles.IPowered)); alert(Vehicles.SpeedBoat.implementsInterface(Vehicles.IPowered));

One of the powerful features of the DataSet class is that you can serialize it in XML format, which means that relational data can be saved in XML format. This feature comes in handy while working in offline mode and transporting data to heterogeneous systems. The WriteXml() method of the DataSet class writes the contents of the DataSet to a stream or physical file in XML format. Optionally, you can also add schema information. To illustrate the use of WriteXml(), you need to create an application like the one shown in Figure 7-6.