Export (0) Print
Expand All
Expand Minimize
This topic has not yet been rated - Rate this topic

DbRangeOptions Enumeration

Specifies the options used by the SetRange method when specifying the index range over which to seek.

This enumeration has a FlagsAttribute attribute that allows a bitwise combination of its member values.

Namespace:  System.Data.SqlServerCe
Assembly:  System.Data.SqlServerCe (in System.Data.SqlServerCe.dll)
[FlagsAttribute]
public enum DbRangeOptions
Member nameDescription
InclusiveStartIncludes the startData value in the range.
InclusiveEndIncludes the endData value in the range.
ExclusiveStartExcludes the startData value from the range.
ExclusiveEndExcludes the endData value from the range.
ExcludeNullsExcludes null values from the range.
PrefixSpecifies a range in which index values begin with the value of startData. When using the Prefix option, endData must be set to null.
MatchSpecifies a range in which index values match the value of startData. When using the Match option, endData must be set to null.
DefaultEquivalent to setting both the InclusiveStart and InclusiveEnd flags.

If you specify the Match or Prefix option, the endData value must be null.

You cannot combine the Match and ExcludeNulls options.

In this example, the range options for the Seek operation on the index are specified as InclusiveStart or InclusiveEnd when calling the SetRange method.

        try
        {
            SqlCeConnection conn = new SqlCeConnection("Data Source = MyDatabase.sdf");
            conn.Open();

            SqlCeCommand cmd = conn.CreateCommand();
            cmd.CommandType = CommandType.TableDirect;
            cmd.IndexName = "Orders_PK";
            cmd.CommandText = "Orders";

            // We are interested in orders that match Order ID = 10020
            //
            cmd.SetRange(DbRangeOptions.Match, new object[] { 10020 }, null);

            SqlCeDataReader reader = cmd.ExecuteReader(CommandBehavior.Default);

            for (int i = 1; reader.Read(); i++)
            {
                MessageBox.Show(String.Format("{0} ; {1}", reader["Order ID"], reader["Order Date"]));
            }

            // Now we are interested in orders with Order ID between (10020, 10050)
            //
            cmd.SetRange(DbRangeOptions.InclusiveStart | DbRangeOptions.InclusiveEnd,
                new object[] { 10020 }, new object[] { 10050 });

            reader = cmd.ExecuteReader(CommandBehavior.Default);

            // Now seek to Order ID = 10045
            //
            bool onRow = reader.Seek(DbSeekOptions.FirstEqual, new object[] { 10045 });

            // Now ,the reader will return rows with Order ID >= 10045 <= 10050
            // because the range was set to (10020, 10050)
            //
            if (onRow)
            {
				for (int i = 1; reader.Read(); i++)
				{
					MessageBox.Show(String.Format("{0} ; {1}", reader["Order ID"], reader["Order Date"]));
				}
            }
        }
        catch (Exception e)
        {
            MessageBox.Show(e.Message);
        }


Did you find this helpful?
(1500 characters remaining)
Thank you for your feedback
Show:
© 2014 Microsoft. All rights reserved.