/*
Mastering Visual C# .NET
by Jason Price, Mike Gunderloy
Publisher: Sybex;
ISBN: 0782129110
*/
/*
Example23_5.cs illustrates the use of a DataView object to
filter and sort rows
*/
using System;
using System.Data;
using System.Data.SqlClient;
public class Example23_5
{
public static void Main()
{
// formulate a string containing the details of the
// database connection
string connectionString =
"server=localhost;database=Northwind;uid=sa;pwd=sa";
// create a SqlConnection object to connect to the
// database, passing the connection string to the constructor
SqlConnection mySqlConnection =
new SqlConnection(connectionString);
// formulate a string containing a SELECT statement
string selectString =
"SELECT CustomerID, CompanyName, City, Country " +
"FROM Customers";
// create a SqlCommand object to hold the SELECT statement
SqlCommand mySqlCommand = mySqlConnection.CreateCommand();
// set the CommandText property of the SqlCommand object to
// the SELECT string
mySqlCommand.CommandText = selectString;
// create a SqlDataAdapter object
SqlDataAdapter mySqlDataAdapter = new SqlDataAdapter();
// set the SelectCommand property of the SqlAdapter object
// to the SqlCommand object
mySqlDataAdapter.SelectCommand = mySqlCommand;
// create a DataSet object to store the results of
// the SELECT statement
DataSet myDataSet = new DataSet();
// open the database connection using the
// Open() method of the SqlConnection object
mySqlConnection.Open();
// use the Fill() method of the SqlDataAdapter object to
// retrieve the rows from the table, storing the rows locally
// in a DataTable of the DataSet object
Console.WriteLine("Retrieving rows from the Customers table");
mySqlDataAdapter.Fill(myDataSet, "Customers");
// create a DataView object
DataView myDataView =
new DataView(myDataSet.Tables["Customers"]);
// set the RowFilter property of the DataView object
myDataView.RowFilter = "Country = 'UK'";
// set the Sort property of the DataView object
myDataView.Sort = "CustomerID ASC";
// display the rows in the DataView object
foreach (DataRowView myDataRowView in myDataView)
{
for (int count = 0; count < myDataView.Table.Columns.Count; count++)
{
Console.WriteLine(myDataRowView[count]);
}
}
// close the database connection using the Close() method
// of the SqlConnection object
mySqlConnection.Close();
}
}