SqlDataAdapter SelectCommand,InsertCommand,UpdateCommand,DeleteCommand 属性

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;

}