/// <summary>
/// Create and prepare a TurboDBCommand, and call ExecuteReader with the appropriate CommandBehavior.
/// </summary>
/// <remarks>
/// If we created and opened the connection, we want the connection to be closed when the DataReader is closed.
///
/// If the caller provided the connection, we want to leave it to them to manage.
/// </remarks>
/// <param name="connection">A valid TurboDBConnection, on which to execute this command</param>
/// <param name="transaction">A valid TurboDBTransaction, or 'null'</param>
/// <param name="commandType">The CommandType (TableDirect, Text)</param>
/// <param name="commandText">The T-SQL command</param>
/// <param name="commandParameters">An array of TurboDBParameters to be associated with the command or 'null' if no parameters are required</param>
/// <param name="connectionOwnership">Indicates whether the connection parameter was provided by the caller, or created by TurboDBHelper</param>
/// <returns>TurboDBDataReader containing the results of the command</returns>
private static TurboDBDataReader ExecuteReader(TurboDBConnection connection, TurboDBTransaction transaction, CommandType commandType, string commandText, TurboDBParameter[] commandParameters, TurboDBConnectionOwnership connectionOwnership)
{
if( connection == null ) throw new ArgumentNullException( "connection" );
bool mustCloseConnection = false;
// Create a command and prepare it for execution
TurboDBCommand cmd = new TurboDBCommand();
try
{
PrepareCommand(cmd, connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection );
// Create a reader
TurboDBDataReader dataReader;
// Call ExecuteReader with the appropriate CommandBehavior
if (connectionOwnership == TurboDBConnectionOwnership.External)
{
dataReader = cmd.ExecuteReader();
}
else
{
dataReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
}
// Detach the TurboDBParameters from the command object, so they can be used again.
// HACK: There is a problem here, the output parameter values are fletched
// when the reader is closed, so if the parameters are detached from the command
// then the TurboDBReader can´t set its values.
// When this happen, the parameters can´t be used again in other command.
bool canClear = true;
foreach(TurboDBParameter commandParameter in cmd.Parameters)
{
if (commandParameter.Direction != ParameterDirection.Input)
canClear = false;
}
if (canClear)
{
cmd.Parameters.Clear();
}
return dataReader;
}
catch
{
if( mustCloseConnection )
connection.Close();
throw;
}
}
/// <summary>
/// Execute a TurboDBCommand (that returns a resultset) against the specified TurboDBConnection
/// using the provided parameters.
/// </summary>
/// <remarks>
/// e.g.:
/// string r = ExecuteXml(conn, CommandType.Text, "Select * from TableTransaction where ProdId=?", new TurboDBParameter("@prodid", 24));
/// </remarks>
/// <param name="connection">A valid TurboDBConnection</param>
/// <param name="commandType">The CommandType (TableDirect, Text)</param>
/// <param name="commandText">The T-SQL command using "FOR XML AUTO"</param>
/// <param name="commandParameters">An array of TurboDBParamters used to execute the command</param>
/// <returns>An string containing the resultset generated by the command</returns>
public static string ExecuteXml(TurboDBConnection connection, CommandType commandType, string commandText, params TurboDBParameter[] commandParameters)
{
if( connection == null ) throw new ArgumentNullException( "connection" );
bool mustCloseConnection = false;
// Create a command and prepare it for execution
TurboDBCommand cmd = new TurboDBCommand();
try
{
PrepareCommand(cmd, connection, (TurboDBTransaction)null, commandType, commandText, commandParameters, out mustCloseConnection );
// Create the DataAdapter & DataSet
TurboDBDataAdapter obj_Adapter =new TurboDBDataAdapter (cmd);
DataSet ds=new DataSet();
ds.Locale =CultureInfo.InvariantCulture;
obj_Adapter.Fill(ds);
// Detach the TurboDBParameters from the command object, so they can be used again
cmd.Parameters.Clear();
string retval= ds.GetXml();
ds.Clear();
obj_Adapter.Dispose ();
return retval;
}
catch
{
if( mustCloseConnection )
connection.Close();
throw;
}
}
/// <summary>
/// Execute a TurboDBCommand (that returns a 1x1 resultset) against the specified TurboDBConnection
/// using the provided parameters.
/// </summary>
/// <remarks>
/// e.g.:
/// int orderCount = (int)ExecuteScalar(conn, CommandType.Text, "Select count(Order) from TableTransaction where ProdId=?", new TurboDBParameter("@prodid", 24));
/// </remarks>
/// <param name="connection">A valid TurboDBConnection</param>
/// <param name="commandType">The CommandType (TableDirect, Text)</param>
/// <param name="commandText">The T-SQL command</param>
/// <param name="commandParameters">An array of TurboDBParamters used to execute the command</param>
/// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
public static object ExecuteScalar(TurboDBConnection connection, CommandType commandType, string commandText, params TurboDBParameter[] commandParameters)
{
if( connection == null ) throw new ArgumentNullException( "connection" );
// Create a command and prepare it for execution
TurboDBCommand cmd = new TurboDBCommand();
bool mustCloseConnection = false;
PrepareCommand(cmd, connection, (TurboDBTransaction)null, commandType, commandText, commandParameters, out mustCloseConnection );
// Execute the command & return the results
object retval = cmd.ExecuteScalar();
// Detach the TurboDBParameters from the command object, so they can be used again
cmd.Parameters.Clear();
if( mustCloseConnection )
connection.Close();
return retval;
}
/// <summary>
/// Execute a TurboDBCommand (that returns a resultset) against the database specified in the connection string
/// using the provided parameters.
/// </summary>
/// <remarks>
/// e.g.:
/// TurboDBDataReader dr = ExecuteReader(connString, CommandType.Text, "Select Orderid from TableTransaction where ProdId=?", new TurboDBParameter("@prodid", 24));
/// </remarks>
/// <param name="connectionString">A valid connection string for a TurboDBConnection</param>
/// <param name="commandType">The CommandType (TableDirect, Text)</param>
/// <param name="commandText">The T-SQL command</param>
/// <param name="commandParameters">An array of TurboDBParamters used to execute the command</param>
/// <returns>A TurboDBDataReader containing the resultset generated by the command</returns>
public static TurboDBDataReader ExecuteReader(string connectionString, CommandType commandType, string commandText, params TurboDBParameter[] commandParameters)
{
if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );
TurboDBConnection connection = null;
try
{
connection = new TurboDBConnection(connectionString);
// Call the private overload that takes an internally owned connection in place of the connection string
return ExecuteReader(connection, null, commandType, commandText, commandParameters,TurboDBConnectionOwnership.Internal);
}
catch
{
// If we fail to return the TurboDBDatReader, we need to close the connection ourselves
if( connection != null ) connection.Close();
throw;
}
}
/// <summary>
/// Execute a TurboDBCommand (that returns a resultset) against the specified TurboDBConnection
/// using the provided parameters.
/// </summary>
/// <remarks>
/// e.g.:
/// DataSet ds = ExecuteDataset(conn, CommandType.Text, "Select * from TableTransaction where ProdId=?", new TurboDBParameter("@prodid", 24));
/// </remarks>
/// <param name="connection">A valid TurboDBConnection</param>
/// <param name="commandType">The CommandType (TableDirect, Text)</param>
/// <param name="commandText">The T-SQL command</param>
/// <param name="commandParameters">An array of TurboDBParamters used to execute the command</param>
/// <returns>A dataset containing the resultset generated by the command</returns>
public static DataSet ExecuteDataset(TurboDBConnection connection, CommandType commandType, string commandText, params TurboDBParameter[] commandParameters)
{
if( connection == null ) throw new ArgumentNullException( "connection" );
// Create a command and prepare it for execution
TurboDBCommand cmd = new TurboDBCommand();
bool mustCloseConnection = false;
PrepareCommand(cmd, connection, (TurboDBTransaction)null, commandType, commandText, commandParameters, out mustCloseConnection );
// Create the DataAdapter & DataSet
TurboDBDataAdapter da = new TurboDBDataAdapter(cmd);
DataSet ds = new DataSet();
ds.Locale =CultureInfo.InvariantCulture;
// Fill the DataSet using default values for DataTable names, etc
da.Fill(ds);
// Detach the TurboDBParameters from the command object, so they can be used again
cmd.Parameters.Clear();
if( mustCloseConnection )
connection.Close();
// Return the dataset
return ds;
}
/// <summary>
/// Private helper method that execute a TurboDBCommand (that returns a resultset) against the specified TurboDBTransaction and TurboDBConnection
/// using the provided parameters.
/// </summary>
/// <remarks>
/// e.g.:
/// FillDataset(conn, trans, CommandType.Text, "Select * from TableTransaction where ProdId=?", ds, new string[] {"orders"}, new TurboDBParameter("@prodid", 24));
/// </remarks>
/// <param name="connection">A valid TurboDBConnection</param>
/// <param name="transaction">A valid TurboDBTransaction</param>
/// <param name="commandType">The CommandType (TableDirect, Text)</param>
/// <param name="commandText">The T-SQL command</param>
/// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
/// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
/// by a user defined name (probably the actual table name)
/// </param>
/// <param name="commandParameters">An array of TurboDBParamters used to execute the command</param>
private static void FillDataset(TurboDBConnection connection, TurboDBTransaction transaction, CommandType commandType,
string commandText, DataSet dataSet, string[] tableNames,
params TurboDBParameter[] commandParameters)
{
if( connection == null ) throw new ArgumentNullException( "connection" );
if( dataSet == null ) throw new ArgumentNullException( "dataSet" );
// Create a command and prepare it for execution
TurboDBCommand command = new TurboDBCommand();
bool mustCloseConnection = false;
PrepareCommand(command, connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection );
// Create the DataAdapter & DataSet
TurboDBDataAdapter dataAdapter = new TurboDBDataAdapter(command);
try
{
// Add the table mappings specified by the user
if (tableNames != null && tableNames.Length > 0)
{
string tableName = "Table";
for (int index=0; index < tableNames.Length; index++)
{
if( tableNames[index] == null || tableNames[index].Length == 0 ) throw new ArgumentException( "The tableNames parameter must contain a list of tables, a value was provided as null or empty string.", "tableNames" );
dataAdapter.TableMappings.Add(tableName, tableNames[index]);
tableName += (index + 1).ToString();
}
}
// Fill the DataSet using default values for DataTable names, etc
dataAdapter.Fill(dataSet);
// Detach the TurboDBParameters from the command object, so they can be used again
command.Parameters.Clear();
if( mustCloseConnection )
connection.Close();
}
finally
{
dataAdapter.Dispose();
}
}
