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;
}