public ExcelQueryExecutor(ExcelQueryArgs args)
{
ValidateArgs(args);
_args = args;
if (_log.IsDebugEnabled)
{
_log.DebugFormat("Connection String: {0}", ExcelUtilities.GetConnection(args).ConnectionString);
}
GetWorksheetName();
}
/// <summary>
/// Executes the sql query and returns the data results
/// </summary>
/// <param name="sql"></param>
/// <param name="queryModel">Linq query model</param>
protected IEnumerable <object> GetDataResults(SqlParts sql, QueryModel queryModel)
{
IEnumerable <object> results;
OleDbDataReader data = null;
var conn = ExcelUtilities.GetConnection(_args);
var command = conn.CreateCommand();
try
{
if (conn.State == ConnectionState.Closed)
{
conn.Open();
}
command.CommandText = sql.ToString();
command.Parameters.AddRange(sql.Parameters.ToArray());
try { data = command.ExecuteReader(); }
catch (OleDbException e)
{
if (e.Message.Contains(_args.WorksheetName))
{
throw new DataException(
string.Format(
"'{0}' is not a valid worksheet name in file {3}. Valid worksheet names are: '{1}'. Error received: {2}",
_args.WorksheetName,
string.Join("', '", ExcelUtilities.GetWorksheetNames(_args.FileName).ToArray()),
e.Message, _args.FileName), e);
}
if (!CheckIfInvalidColumnNameUsed(sql))
{
throw;
}
}
var columns = ExcelUtilities.GetColumnNames(data);
LogColumnMappingWarnings(columns);
if (columns.Count() == 1 && columns.First() == "Expr1000")
{
results = GetScalarResults(data);
}
else if (queryModel.MainFromClause.ItemType == typeof(ExcelRow))
{
results = GetRowResults(data, columns);
}
else if (queryModel.MainFromClause.ItemType == typeof(ExcelRowNoHeader))
{
results = GetRowNoHeaderResults(data);
}
else
{
results = GetTypeResults(data, columns, queryModel);
}
}
finally
{
command.Dispose();
if (!_args.UsePersistentConnection)
{
conn.Dispose();
_args.PersistentConnection = null;
}
}
return(results);
}