Classe SqlCeParameterCollection

Artigo
01/17/2011

Coleta todos os parâmetros relevantes para um SqlCeCommand, além de seus respectivos mapeamentos em colunas do DataSet.

Namespace: System.Data.SqlServerCe
Assembly: System.Data.SqlServerCe (em System.Data.SqlServerCe.dll)

Sintaxe

'Declaração
Public NotInheritable Class SqlCeParameterCollection _
    Inherits DbParameterCollection
'Uso
Dim instance As SqlCeParameterCollection

public sealed class SqlCeParameterCollection : DbParameterCollection

public ref class SqlCeParameterCollection sealed : public DbParameterCollection

[<SealedAttribute>]
type SqlCeParameterCollection =  
    class
        inherit DbParameterCollection
    end

public final class SqlCeParameterCollection extends DbParameterCollection

Comentários

O número de parâmetros na coleção deve ser igual ao número de espaços reservados para parâmetros no texto do comando. Caso contrário, o Provedor de Dados do .NET Compact Framework para SQL Server Compact 3.5 poderá gerar um erro.

Exemplos

O exemplo a seguir cria várias instâncias de SqlCeParameter pela coleção SqlCeParameterCollection no SqlCeDataAdapter. Esses parâmetros são usados para selecionar dados na fonte de dados. Em seguida, eles colocam os dados no DataSet. Este exemplo presume que já foram criados um DataSet e um SqlCeDataAdapter com o esquema, os comandos e a conexão apropriados.

Dim cmd As SqlCeCommand = Nothing
Dim adp As SqlCeDataAdapter = Nothing

Try
    adp = New SqlCeDataAdapter()
    Dim conn As New SqlCeConnection("Data Source = MyDatabase.sdf")

    ' Create the SelectCommand
    '
    cmd = conn.CreateCommand()
    cmd.CommandText = "SELECT * FROM Orders WHERE [Ship Country] = @country AND [Ship City] = @city"
    cmd.Parameters.Add("@country", SqlDbType.NVarChar, 15)
    cmd.Parameters.Add("@city", SqlDbType.NVarChar, 15)

    cmd.Parameters("@country").Value = "UK"
    cmd.Parameters("@city").Value = "London"

    adp.SelectCommand = cmd

    ' Create the DeleteCommand
    '
    cmd = conn.CreateCommand()
    cmd.CommandText = "DELETE FROM Orders WHERE [Order ID] = @orderID"

    Dim p As SqlCeParameter = cmd.Parameters.Add("@orderID", SqlDbType.NChar, 5, "Order ID")
    p.SourceVersion = DataRowVersion.Original

    adp.DeleteCommand = cmd

    ' Populate the dataset with the results from the SELECT statement
    '
    Dim ds As New DataSet()
    adp.Fill(ds)

    ' Modify the dataset
    '
    MessageBox.Show("Number of rows: " & ds.Tables(0).Rows.Count)

    ' Delete some rows
    '
    ds.Tables(0).Rows(3).Delete()
    ds.Tables(0).Rows(4).Delete()

    ' This will execute two DELETE statements 
    '
    adp.Update(ds.Tables(0))
Catch e As Exception
    MessageBox.Show(e.Message)
Finally
    If Not Nothing Is adp.SelectCommand Then
        adp.SelectCommand.Dispose()
    End If
    If Not Nothing Is adp.DeleteCommand Then
        adp.DeleteCommand.Dispose()
    End If
End Try

SqlCeCommand cmd = null;
SqlCeDataAdapter adp = null;

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

    // Create the SelectCommand
    //
    cmd = conn.CreateCommand();
    cmd.CommandText = "SELECT * FROM Orders WHERE [Ship Country] = @country AND [Ship City] = @city";
    cmd.Parameters.Add("@country", SqlDbType.NVarChar, 15);
    cmd.Parameters.Add("@city", SqlDbType.NVarChar, 15);

    cmd.Parameters["@country"].Value = "UK";
    cmd.Parameters["@city"].Value = "London";

    adp.SelectCommand = cmd;

    // Create the DeleteCommand
    //
    cmd = conn.CreateCommand();
    cmd.CommandText = "DELETE FROM Orders WHERE [Order ID] = @orderID";

    SqlCeParameter p = cmd.Parameters.Add("@orderID", SqlDbType.NChar, 5, "Order ID");
    p.SourceVersion = DataRowVersion.Original;

    adp.DeleteCommand = cmd;

    // Populate the dataset with the results from the SELECT statement
    //
    DataSet ds = new DataSet();
    adp.Fill(ds);

    // Modify the dataset
    //
    MessageBox.Show("Number of rows: " + ds.Tables[0].Rows.Count);

    // Delete some rows
    //
    ds.Tables[0].Rows[3].Delete();
    ds.Tables[0].Rows[4].Delete();

    // This will execute two DELETE statements 
    //
    adp.Update(ds.Tables[0]);
}
catch (Exception e)
{
    MessageBox.Show(e.Message);
}
finally
{
    if (null != adp.SelectCommand) adp.SelectCommand.Dispose();
    if (null != adp.DeleteCommand) adp.DeleteCommand.Dispose();
}

Hierarquia de herança

System. . :: . .Object
  System. . :: . .MarshalByRefObject
    System.Data.Common. . :: . .DbParameterCollection
      System.Data.SqlServerCe..::..SqlCeParameterCollection

Segurança de thread

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.

Consulte também

Referência

Membros SqlCeParameterCollection

Namespace System.Data.SqlServerCe

Partilhar via