SqlDataAdapter.DeleteCommand Propriedade

Definição

Obtém ou define uma instrução Transact-SQL ou um procedimento armazenado para excluir registros na fonte de dados.Gets or sets a Transact-SQL statement or stored procedure to delete records from the data set.

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

Valor da propriedade

SqlCommand

Um SqlCommand usado durante o Update(DataSet) para excluir registros no banco de dados que correspondem às linhas excluídas no DataSet.A SqlCommand used during Update(DataSet) to delete records in the database that correspond to deleted rows in the DataSet.

Atributos

Exemplos

O exemplo a seguir cria um SqlDataAdapter e define SelectCommand as InsertCommand Propriedades,, e UpdateCommand DeleteCommand .The following example creates a SqlDataAdapter and sets the SelectCommand, InsertCommand, UpdateCommand, and DeleteCommand properties. Ele pressupõe que você já criou um SqlConnection objeto.It assumes you have already created a SqlConnection object.

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

Comentários

Durante Update , se essa propriedade não for definida e as informações de chave primária estiverem presentes no DataSet , o DeleteCommand poderá ser gerado automaticamente se você definir a SelectCommand propriedade e usar o SqlCommandBuilder .During Update, if this property is not set and primary key information is present in the DataSet, the DeleteCommand can be generated automatically if you set the SelectCommand property and use the SqlCommandBuilder. Em seguida, os comandos adicionais que você não definir serão gerados pelo SqlCommandBuilder .Then, any additional commands that you do not set are generated by the SqlCommandBuilder. Esta lógica de geração requer que as informações da coluna principal estejam presente no DataSet.This generation logic requires key column information to be present in the DataSet. Para obter mais informações, confira Gerar comandos com CommandBuilders.For more information, see Generating Commands with CommandBuilders.

Quando DeleteCommand é atribuído a um criado anteriormente SqlCommand , o SqlCommand não é clonado.When DeleteCommand is assigned to a previously created SqlCommand, the SqlCommand is not cloned. O DeleteCommand mantém uma referência ao objeto criado anteriormente SqlCommand .The DeleteCommand maintains a reference to the previously created SqlCommand object.

Para cada coluna que você propaga para a fonte de dados em Update , um parâmetro deve ser adicionado ao InsertCommand , UpdateCommand ou DeleteCommand .For every column that you propagate to the data source on Update, a parameter should be added to the InsertCommand, UpdateCommand, or DeleteCommand. A SourceColumn Propriedade do parâmetro deve ser definida como o nome da coluna.The SourceColumn property of the parameter should be set to the name of the column. Isso indica que o valor do parâmetro não é definido manualmente, mas é tirado da coluna específica na linha processada atualmente.This indicates that the value of the parameter is not set manually, but is taken from the particular column in the currently processed row.

Aplica-se a