SqlCeResultSet Class
An updateable, scrollable, and bindable cursor.
Namespace: System.Data.SqlServerCe
Assembly: System.Data.SqlServerCe (in System.Data.SqlServerCe.dll)
Syntax
'Declaration
Public Class SqlCeResultSet _
Inherits SqlCeDataReader _
Implements IEnumerable, IListSource
'Usage
Dim instance As SqlCeResultSet
public class SqlCeResultSet : SqlCeDataReader,
IEnumerable, IListSource
public ref class SqlCeResultSet : public SqlCeDataReader,
IEnumerable, IListSource
type SqlCeResultSet =
class
inherit SqlCeDataReader
interface IEnumerable
interface IListSource
end
public class SqlCeResultSet extends SqlCeDataReader implements IEnumerable, IListSource
Remarks
In earlier versions of , to bind controls to data, you had to use a DataSet. While a SqlCeDataReader provides better performance than a DataSet, it is a forward-only, non-updateable cursor. In , the SqlCeResultSet provides a combination of functionality: the updateability and scrollability of the DataSet plus performance similar to a SqlCeDataReader.
To create a SqlCeResultSet, you must call the ExecuteResultSet method rather than using the object's constructor.
The ResultSetOptions let you specify the scrollabilty, updatability, and sensitivity (which determines if the SqlCeResultSet sees changes made by itself or others) of the SqlCeResultSet.
The default position of the SqlCeDataReader is prior to the first record. To begin accessing any data, you must call Read. The first Read will position the cursor to the first record. The behaviour is different from that of SqlCeResultSet.Read method. The default position of the SqlCeResultSet is the first record. Calling SqlCeResultSet.Read method immediately after creating the SqlCeResultSet will move the cursor to the second record.
Examples
In the following example, a new database is created. A SqlCeResultSet is then initialized to populate the dataset with data.
Dim conn As SqlCeConnection = Nothing
Try
File.Delete("Test.sdf")
Dim engine As New SqlCeEngine("Data Source = Test.sdf")
engine.CreateDatabase()
conn = New SqlCeConnection("Data Source = Test.sdf")
conn.Open()
Dim cmd As SqlCeCommand = conn.CreateCommand()
cmd.CommandText = "CREATE TABLE myTable (col1 INT, col2 MONEY, col3 NVARCHAR(200))"
cmd.ExecuteNonQuery()
cmd.CommandText = "SELECT * FROM myTable"
Dim rs As SqlCeResultSet = cmd.ExecuteResultSet(ResultSetOptions.Updatable Or ResultSetOptions.Scrollable)
Dim rec As SqlCeUpdatableRecord = rs.CreateRecord()
rec.SetInt32(0, 34)
rec.SetDecimal(1, System.Convert.ToDecimal(44.66))
rec.SetString(2, "Sample text")
rs.Insert(rec)
Catch e As Exception
MessageBox.Show(e.Message)
Finally
conn.Close()
End Try
SqlCeConnection conn = null;
try
{
File.Delete("Test.sdf");
SqlCeEngine engine = new SqlCeEngine("Data Source = Test.sdf");
engine.CreateDatabase();
conn = new SqlCeConnection("Data Source = Test.sdf");
conn.Open();
SqlCeCommand cmd = conn.CreateCommand();
cmd.CommandText = "CREATE TABLE myTable (col1 INT, col2 MONEY, col3 NVARCHAR(200))";
cmd.ExecuteNonQuery();
cmd.CommandText = "SELECT * FROM myTable";
SqlCeResultSet rs = cmd.ExecuteResultSet(ResultSetOptions.Updatable |
ResultSetOptions.Scrollable);
SqlCeUpdatableRecord rec = rs.CreateRecord();
rec.SetInt32(0, 34);
rec.SetDecimal(1, (decimal)44.66);
rec.SetString(2, "Sample text");
rs.Insert(rec);
}
catch (Exception e)
{
MessageBox.Show(e.Message);
}
finally
{
conn.Close();
}
Inheritance Hierarchy
System. . :: . .Object
System. . :: . .MarshalByRefObject
System.Data.Common. . :: . .DbDataReader
System.Data.SqlServerCe. . :: . .SqlCeDataReader
System.Data.SqlServerCe..::..SqlCeResultSet
Thread Safety
Any public static (Shared in Microsoft Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.