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SqlDataAdapter.DeleteCommand Propiedad

Definición

Obtiene o establece un procedimiento almacenado o una instrucción de Transact-SQL para eliminar registros de un conjunto de datos.

public:
 property System::Data::SqlClient::SqlCommand ^ DeleteCommand { System::Data::SqlClient::SqlCommand ^ get(); void set(System::Data::SqlClient::SqlCommand ^ value); };
[System.Data.DataSysDescription("DbDataAdapter_DeleteCommand")]
public System.Data.SqlClient.SqlCommand DeleteCommand { get; set; }
public System.Data.SqlClient.SqlCommand DeleteCommand { get; set; }
[<System.Data.DataSysDescription("DbDataAdapter_DeleteCommand")>]
member this.DeleteCommand : System.Data.SqlClient.SqlCommand with get, set
member this.DeleteCommand : System.Data.SqlClient.SqlCommand with get, set
Public Property DeleteCommand As SqlCommand

Valor de propiedad

SqlCommand que se utiliza durante Update(DataSet) para eliminar los registros de la base de datos correspondientes a las filas eliminadas en DataSet.

Atributos

Ejemplos

En el ejemplo siguiente se crea y SqlDataAdapter se establecen las SelectCommandpropiedades , InsertCommand, UpdateCommandy DeleteCommand . Se supone que ya ha creado un SqlConnection objeto .

public static SqlDataAdapter CreateCustomerAdapter(
    SqlConnection connection)
{
    SqlDataAdapter adapter = new SqlDataAdapter();

    // Create the SelectCommand.
    SqlCommand command = new SqlCommand("SELECT * FROM Customers " +
        "WHERE Country = @Country AND City = @City", connection);

    // Add the parameters for the SelectCommand.
    command.Parameters.Add("@Country", SqlDbType.NVarChar, 15);
    command.Parameters.Add("@City", SqlDbType.NVarChar, 15);

    adapter.SelectCommand = command;

    // Create the InsertCommand.
    command = new SqlCommand(
        "INSERT INTO Customers (CustomerID, CompanyName) " +
        "VALUES (@CustomerID, @CompanyName)", connection);

    // Add the parameters for the InsertCommand.
    command.Parameters.Add("@CustomerID", SqlDbType.NChar, 5, "CustomerID");
    command.Parameters.Add("@CompanyName", SqlDbType.NVarChar, 40, "CompanyName");

    adapter.InsertCommand = command;

    // Create the UpdateCommand.
    command = new SqlCommand(
        "UPDATE Customers SET CustomerID = @CustomerID, CompanyName = @CompanyName " +
        "WHERE CustomerID = @oldCustomerID", connection);

    // Add the parameters for the UpdateCommand.
    command.Parameters.Add("@CustomerID", SqlDbType.NChar, 5, "CustomerID");
    command.Parameters.Add("@CompanyName", SqlDbType.NVarChar, 40, "CompanyName");
    SqlParameter parameter = command.Parameters.Add(
        "@oldCustomerID", SqlDbType.NChar, 5, "CustomerID");
    parameter.SourceVersion = DataRowVersion.Original;

    adapter.UpdateCommand = command;

    // Create the DeleteCommand.
    command = new SqlCommand(
        "DELETE FROM Customers WHERE CustomerID = @CustomerID", connection);

    // Add the parameters for the DeleteCommand.
    parameter = command.Parameters.Add(
        "@CustomerID", SqlDbType.NChar, 5, "CustomerID");
    parameter.SourceVersion = DataRowVersion.Original;

    adapter.DeleteCommand = command;

    return adapter;
}
Public Function CreateCustomerAdapter( _
  ByVal connection As SqlConnection) As SqlDataAdapter

    Dim adapter As SqlDataAdapter = New SqlDataAdapter()

    ' Create the SelectCommand.
    Dim command As SqlCommand = New SqlCommand( _
        "SELECT * FROM Customers " & _
        "WHERE Country = @Country AND City = @City", connection)

    ' Add the parameters for the SelectCommand.
    command.Parameters.Add("@Country", SqlDbType.NVarChar, 15)
    command.Parameters.Add("@City", SqlDbType.NVarChar, 15)

    adapter.SelectCommand = command

    ' Create the InsertCommand.
    command = New SqlCommand( _
        "INSERT INTO Customers (CustomerID, CompanyName) " & _
        "VALUES (@CustomerID, @CompanyName)", connection)

    ' Add the parameters for the InsertCommand.
    command.Parameters.Add("@CustomerID", SqlDbType.NChar, 5, "CustomerID")
    command.Parameters.Add("@CompanyName", SqlDbType.NVarChar, 40, "CompanyName")

    adapter.InsertCommand = command

    ' Create the UpdateCommand.
    command = New SqlCommand( _
        "UPDATE Customers SET CustomerID = @CustomerID, CompanyName = @CompanyName " & _
        "WHERE CustomerID = @oldCustomerID", connection)

    ' Add the parameters for the UpdateCommand.
    command.Parameters.Add("@CustomerID", SqlDbType.NChar, 5, "CustomerID")
    command.Parameters.Add("@CompanyName", SqlDbType.NVarChar, 40, "CompanyName")
    Dim parameter As SqlParameter = command.Parameters.Add( _
        "@oldCustomerID", SqlDbType.NChar, 5, "CustomerID")
    parameter.SourceVersion = DataRowVersion.Original

    adapter.UpdateCommand = command

    ' Create the DeleteCommand.
    command = New SqlCommand( _
        "DELETE FROM Customers WHERE CustomerID = @CustomerID", connection)

    ' Add the parameters for the DeleteCommand.
    command.Parameters.Add( _
        "@CustomerID", SqlDbType.NChar, 5, "CustomerID")
    parameter.SourceVersion = DataRowVersion.Original

    adapter.DeleteCommand = command

    Return adapter
End Function

Comentarios

Durante Update, si esta propiedad no está establecida y la información de la clave principal está presente en DataSet, DeleteCommand se puede generar automáticamente si establece la SelectCommand propiedad y usa .SqlCommandBuilder A continuación, los comandos adicionales que no establezca se generan mediante .SqlCommandBuilder Esta lógica de generación requiere que la información de columna de clave esté presente en .DataSet Para obtener más información, vea Generar comandos con objetos CommandBuilder.

Cuando DeleteCommand se asigna a un objeto creado SqlCommandanteriormente, SqlCommand no se clona. DeleteCommand mantiene una referencia al objeto creado SqlCommand anteriormente.

Para cada columna que se propaga al origen de datos en Update, se debe agregar un parámetro a InsertCommand, UpdateCommando DeleteCommand. La SourceColumn propiedad del parámetro debe establecerse en el nombre de la columna. Esto indica que el valor del parámetro no se establece manualmente, pero se toma de la columna concreta de la fila procesada actualmente.

Se aplica a

Consulte también