TREEVIEW只输入表名,父ID,节点ID,节点名就得到树型结构之三(转)

///
/// This method opens (if necessary) and assigns a connection, transaction, command type and parameters
/// to the provided command
///
/// The SqlCommand to be prepared
/// A valid SqlConnection, on which to execute this command
/// A valid SqlTransaction, or 'null'
/// The CommandType (stored procedure, text, etc.)
/// The stored procedure name or T-SQL command
/// An array of SqlParameters to be associated with the command or 'null' if no parameters are required
/// true if the connection was opened by the method, otherwose is false.
private static void PrepareCommand(SqlCommand command, SqlConnection connection, SqlTransaction transaction, CommandType commandType, string commandText, SqlParameter[] commandParameters, out bool mustCloseConnection )
{
if( command == null ) throw new ArgumentNullException( "command" );
if( commandText == null || commandText.Length == 0 ) throw new ArgumentNullException( "commandText" );

// If the provided connection is not open, we will open it
if (connection.State != ConnectionState.Open)
{
mustCloseConnection = true;
connection.Open();
}
else
{
mustCloseConnection = false;
}

// Associate the connection with the command
command.Connection = connection;

// Set the command text (stored procedure name or SQL statement)
command.CommandText = commandText;

// If we were provided a transaction, assign it
if (transaction != null)
{
if( transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );
command.Transaction = transaction;
}

// Set the command type
command.CommandType = commandType;

// Attach the command parameters if they are provided
if (commandParameters != null)
{
AttachParameters(command, commandParameters);
}
return;
}

#endregion private utility methods & constructors

#region ExecuteNonQuery

///
/// Execute a SqlCommand (that returns no resultset and takes no parameters) against the database specified in
/// the connection string
///
///
/// e.g.:
/// int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders");
///
/// A valid connection string for a SqlConnection
/// The CommandType (stored procedure, text, etc.)
/// The stored procedure name or T-SQL command
/// An int representing the number of rows affected by the command
public static int ExecuteNonQuery(string connectionString, CommandType commandType, string commandText)
{
// Pass through the call providing null for the set of SqlParameters
return ExecuteNonQuery(connectionString, commandType, commandText, (SqlParameter[])null);
}

///
/// Execute a SqlCommand (that returns no resultset) against the database specified in the connection string
/// using the provided parameters
///
///
/// e.g.:
/// int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
///
/// A valid connection string for a SqlConnection
/// The CommandType (stored procedure, text, etc.)
/// The stored procedure name or T-SQL command
/// An array of SqlParamters used to execute the command
/// An int representing the number of rows affected by the command
public static int ExecuteNonQuery(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
{
if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );

// Create & open a SqlConnection, and dispose of it after we are done
using (SqlConnection connection = new SqlConnection(connectionString))
{
connection.Open();

// Call the overload that takes a connection in place of the connection string
return ExecuteNonQuery(connection, commandType, commandText, commandParameters);
}
}

///
/// Execute a stored procedure via a SqlCommand (that returns no resultset) against the database specified in
/// the connection string using the provided parameter values. This method will query the database to discover the parameters for the
/// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
///
///
/// This method provides no access to output parameters or the stored procedure's return value parameter.
///
/// e.g.:
/// int result = ExecuteNonQuery(connString, "PublishOrders", 24, 36);
///
/// A valid connection string for a SqlConnection
/// The name of the stored prcedure
/// An array of objects to be assigned as the input values of the stored procedure
/// An int representing the number of rows affected by the command
public static int ExecuteNonQuery(string connectionString, string spName, params object[] parameterValues)
{
if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );
if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );

// If we receive parameter values, we need to figure out where they go
if ((parameterValues != null) && (parameterValues.Length > 0))
{
// Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);

// Assign the provided values to these parameters based on parameter order
AssignParameterValues(commandParameters, parameterValues);

// Call the overload that takes an array of SqlParameters
return ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
// Otherwise we can just call the SP without params
return ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName);
}
}

[@more@]

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