internal SqlGeneratorQueryModelVisitor(ExcelQueryArgs args)
{
_args = args;
SqlStatement = new SqlParts();
SqlStatement.Table = (String.IsNullOrEmpty(_args.StartRange)) ?
string.Format("[{0}$]",
_args.WorksheetName) :
string.Format("[{0}${1}:{2}]",
_args.WorksheetName, _args.StartRange, _args.EndRange);
if (_args.WorksheetName.ToLower().EndsWith(".csv"))
{
SqlStatement.Table = SqlStatement.Table.Replace("$]", "]");
}
}
private bool CheckIfInvalidColumnNameUsed(SqlParts sql)
{
var usedColumns = sql.ColumnNamesUsed;
var tableColumns = ExcelUtilities.GetColumnNames(_args.WorksheetName, _args.FileName);
foreach (var column in usedColumns)
{
if (!tableColumns.Contains(column))
{
throw new DataException(string.Format(
"'{0}' is not a valid column name. " +
"Valid column names are: '{1}'",
column,
string.Join("', '", tableColumns.ToArray())));
}
}
return(false);
}
private void LogSqlStatement(SqlParts sqlParts)
{
if (_log.IsDebugEnabled)
{
var logMessage = new StringBuilder();
logMessage.AppendFormat("{0};", sqlParts.ToString());
for (var i = 0; i < sqlParts.Parameters.Count(); i++)
{
var paramValue = sqlParts.Parameters.ElementAt(i).Value.ToString();
var paramMessage = string.Format(" p{0} = '{1}';",
i, sqlParts.Parameters.ElementAt(i).Value.ToString());
if (paramValue.IsNumber())
{
paramMessage = paramMessage.Replace("'", "");
}
logMessage.Append(paramMessage);
}
var sqlLog = LogManager.GetLogger("LinqToExcel.SQL");
sqlLog.Debug(logMessage.ToString());
}
}
/// <summary>
/// Executes the sql query and returns the data results
/// </summary>
/// <typeparam name="T">Data type in the main from clause (queryModel.MainFromClause.ItemType)</typeparam>
/// <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. Valid worksheet names are: '{1}'",
_args.WorksheetName, string.Join("', '", ExcelUtilities.GetWorksheetNames(_args.FileName).ToArray())));
}
if (!CheckIfInvalidColumnNameUsed(sql))
{
throw e;
}
}
var columns = ExcelUtilities.GetColumnNames(data);
LogColumnMappingWarnings(columns);
if (columns.Count() == 1 && columns.First() == "Expr1000")
{
results = GetScalarResults(data);
}
else if (queryModel.MainFromClause.ItemType == typeof(Row))
{
results = GetRowResults(data, columns);
}
else if (queryModel.MainFromClause.ItemType == typeof(RowNoHeader))
{
results = GetRowNoHeaderResults(data);
}
else
{
results = GetTypeResults(data, columns, queryModel);
}
}
finally
{
command.Dispose();
if (!_args.UsePersistentConnection)
{
conn.Dispose();
_args.PersistentConnection = null;
}
}
return(results);
}
