/// <summary>
/// Closes the <see cref="T:System.Data.IDataReader"/> Object.
/// </summary>
public void Close()
{
MapiFactory.CloseQueryHandle(_queryHandle);
MapiFactory.CloseConnectionHandle(_connHandle);
IsClosed = true;
}
/// <summary>
/// Executes the <see cref="P:System.Data.IDbCommand.CommandText" /> against the
/// <see cref="P:System.Data.IDbCommand.Connection" /> and builds an <see cref="T:System.Data.IDataReader" />.
/// </summary>
/// <returns>
/// An <see cref="T:System.Data.IDataReader" /> object.
/// </returns>
public IDataReader ExecuteReader()
{
var connHandle = _connection.GetConnectionHandle();
var queryHandle = MapiFactory.GetQueryHandle(connHandle, CommandText);
return(new MonetDbDataReader(queryHandle, _connection));
}
/// <summary>
///
/// </summary>
public void Close()
{
if (State == ConnectionState.Closed)
{
return;
}
MapiFactory.CloseConnectionHandle(_connection);
State = ConnectionState.Closed;
}
/// <summary>
///
/// </summary>
public void Open()
{
if (State == ConnectionState.Open)
{
throw new MonetDbException("Connection already open.");
}
_connection = MapiFactory.GetConnectionhandle(_database.ConnectionInfo);
State = ConnectionState.Open;
}
/// <summary>
/// Executes an SQL statement against the Connection object of a .NET Framework data provider, and returns the number
/// of rows affected.
/// </summary>
/// <returns>
/// The number of rows affected.
/// </returns>
/// <exception cref="T:System.InvalidOperationException">The connection does not exist.-or- The connection is not open. </exception>
public int ExecuteNonQuery()
{
var connHandle = _connection.GetConnectionHandle();
var queryHandle = MapiFactory.GetQueryHandle(connHandle, CommandText);
var rowsAffected = MapiLib.MapiRowsAffected(queryHandle).To <int>();
MapiFactory.DieQueryError(connHandle, queryHandle);
MapiFactory.CloseQueryHandle(queryHandle);
return(rowsAffected);
}
/// <summary>
/// Executes the query, and returns the first column of the first row in the resultset returned by the query. Extra
/// columns or rows are ignored.
/// </summary>
/// <returns>
/// The first column of the first row in the resultset.
/// </returns>
public object ExecuteScalar()
{
var connHandle = _connection.GetConnectionHandle();
var queryHandle = MapiFactory.GetQueryHandle(connHandle, CommandText);
object result = null;
if (MapiLib.MapiFetchRow(queryHandle) > 0)
{
MapiFactory.DieQueryError(connHandle, queryHandle);
result = MapiLib.MapiFetchField(queryHandle, 0);
MapiFactory.DieQueryError(connHandle, queryHandle);
}
MapiFactory.CloseQueryHandle(queryHandle);
return(result);
}
private void DieQueryError()
{
MapiFactory.DieQueryError(_connHandle, _queryHandle);
}
