/// <summary>
/// The execute reader.
/// </summary>
/// <param name="connection">
/// The connection.
/// </param>
/// <param name="transaction">
/// The transaction.
/// </param>
/// <param name="commandType">
/// The command type.
/// </param>
/// <param name="commandText">
/// The command text.
/// </param>
/// <param name="commandParameters">
/// The command parameters.
/// </param>
/// <param name="connectionOwnership">
/// The connection ownership.
/// </param>
/// <returns>
/// The <see cref="OleDbDataReader"/>.
/// </returns>
private static OleDbDataReader ExecuteReader(
OleDbConnection connection,
OleDbTransaction transaction,
CommandType commandType,
string commandText,
OleDbParameter[] commandParameters,
OleDbConnectionOwnership connectionOwnership)
{
// create a command and prepare it for execution
var cmd = new OleDbCommand();
PrepareCommand(cmd, connection, transaction, commandType, commandText, commandParameters);
// create a reader
OleDbDataReader dr;
// call ExecuteReader with the appropriate CommandBehavior
if (connectionOwnership == OleDbConnectionOwnership.External)
{
dr = cmd.ExecuteReader();
}
else
{
dr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
}
return(dr);
}
/// <summary>
/// Create and prepare an OleDbCommand, 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 OleDbConnection, on which to execute this command</param>
/// <param name="transaction">a valid OleDbTransaction, or 'null'</param>
/// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
/// <param name="commandText">the stored procedure name or PL/SQL command</param>
/// <param name="commandParameters">an array of OleDbParameters 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 OleDbHelper</param>
/// <returns>OleDbDataReader containing the results of the command</returns>
private static OleDbDataReader ExecuteReader(OleDbConnection connection, OleDbTransaction transaction, CommandType commandType, string commandText, OleDbParameter[] commandParameters, OleDbConnectionOwnership connectionOwnership)
{
//create a command and prepare it for execution
OleDbCommand cmd = new OleDbCommand();
PrepareCommand(cmd, connection, transaction, commandType, commandText, commandParameters);
//create a reader
OleDbDataReader dr;
// call ExecuteReader with the appropriate CommandBehavior
if (connectionOwnership == OleDbConnectionOwnership.External)
{
dr = cmd.ExecuteReader();
}
else
{
dr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
}
return dr;
}
private static OleDbDataReader ExecuteReader(OleDbConnection connection, OleDbTransaction transaction, string commandText, OleDbParameter[] commandParameters, OleDbConnectionOwnership connectionOwnership)
{
if (null == connection) throw new ArgumentNullException("connection");
bool mustCloseConnection = false;
OleDbCommand cmd = new OleDbCommand();
try
{
PrepareCommand(cmd, connection, transaction, commandText, commandParameters, out mustCloseConnection);
OleDbDataReader dataReader;
if (OleDbConnectionOwnership.External == connectionOwnership)
{
dataReader = cmd.ExecuteReader();
}
else
{
dataReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
}
bool canClear = true;
foreach (OleDbParameter commandParameter in cmd.Parameters)
{
if (ParameterDirection.Input != commandParameter.Direction) canClear = false;
}
if (canClear)
{
cmd.Parameters.Clear();
}
return dataReader;
}
catch
{
if (mustCloseConnection) connection.Close();
throw;
}
}
/// <summary>
/// Create and prepare a OleDbCommand, 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 OleDbConnection, on which to execute this command</param>
/// <param name="transaction">A valid OleDbTransaction, or 'null'</param>
/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
/// <param name="commandText">The stored procedure name or T-SQL command</param>
/// <param name="commandParameters">An array of OleDbParameters 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 OleDBHelper</param>
/// <returns>OleDbDataReader containing the results of the command</returns>
private static OleDbDataReader ExecuteReader(OleDbConnection connection, OleDbTransaction transaction, CommandType commandType, string commandText, OleDbParameter[] commandParameters, OleDbConnectionOwnership connectionOwnership)
{
if (connection == null) throw new ArgumentNullException("connection");
bool mustCloseConnection = false;
// Create a command and prepare it for execution
OleDbCommand cmd = new OleDbCommand();
try
{
PrepareCommand(cmd, connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);
// Create a reader
OleDbDataReader dataReader;
// Call ExecuteReader with the appropriate CommandBehavior
if (connectionOwnership == OleDbConnectionOwnership.External)
{
dataReader = cmd.ExecuteReader();
}
else
{
dataReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
}
// Detach the OleDbParameters 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 SqlReader cant set its values.
// When this happen, the parameters cant be used again in other command.
bool canClear = true;
foreach (OleDbParameter commandParameter in cmd.Parameters)
{
if (commandParameter.Direction != ParameterDirection.Input)
canClear = false;
}
if (canClear)
{
cmd.Parameters.Clear();
}
return dataReader;
}
catch
{
if (mustCloseConnection)
connection.Close();
throw;
}
}
private static OleDbDataReader ExecuteReader(OleDbConnection connection, OleDbTransaction transaction, string commandText, OleDbParameter[] commandParameters, OleDbConnectionOwnership connectionOwnership)
{
if (null == connection)
{
throw new ArgumentNullException("connection");
}
bool mustCloseConnection = false;
OleDbCommand cmd = new OleDbCommand();
try
{
PrepareCommand(cmd, connection, transaction, commandText, commandParameters, out mustCloseConnection);
OleDbDataReader dataReader;
if (OleDbConnectionOwnership.External == connectionOwnership)
{
dataReader = cmd.ExecuteReader();
}
else
{
dataReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
}
bool canClear = true;
foreach (OleDbParameter commandParameter in cmd.Parameters)
{
if (ParameterDirection.Input != commandParameter.Direction)
{
canClear = false;
}
}
if (canClear)
{
cmd.Parameters.Clear();
}
return(dataReader);
}
catch
{
if (mustCloseConnection)
{
connection.Close();
}
throw;
}
}
