Type[] _Types; // types of the columns
public TxtDataReader(System.Data.CommandBehavior behavior, TxtConnection conn, TxtCommand cmd)
{
bFirstRow = false;
_tconn = conn;
_tcmd = cmd;
_behavior = behavior;
string fname = _tcmd.Url;
bool header = _tcmd.Header;
char separator = _tcmd.Separator;
_sr = GetStream(); // get the main stream
Type tstring = "".GetType();
LexTokenList ll = GetLine();
int colcount = ll == null? 0: ll.Count - 1; // don't count the end of line
_Names = _tcmd.Columns;
if (colcount == 0)
{
_sr.Close();
_sr = null;
if (_Names == null)
{
return;
}
_Types = new Type[_Names.Length];
for (int ci = 0; ci < _Types.Length; ci++)
{
_Types[ci] = tstring;
}
return;
}
if (_Names != null && _Names.Length != colcount)
{
throw new Exception(string.Format("{0} column names specified but {1} columns found.", _Names.Length, colcount));
}
if (header)
{
if (_Names == null)
{ // uses the first row as the names of the columns
_Names = new string[colcount];
int ci = 0;
foreach (LexToken lt in ll)
{
if (lt.Type == LexTokenTypes.EOF)
{
break;
}
_Names[ci++] = lt.Value;
}
}
ll = GetLine();
}
else if (_Names == null)
{ // just name the columns 'column1', 'column2', ...
_Names = new string[colcount];
for (int ci = 0; ci < _Names.Length; ci++)
{
_Names[ci] = "column" + (ci + 1).ToString();
}
}
_Data = new object[_Names.Length]; // allocate enough room for data
_Types = new Type[_Names.Length];
if (ll != null) // we have a datarow
{
bFirstRow = true;
// loop thru determining the types of all data
int ci = 0;
foreach (LexToken lt in ll)
{
if (ci >= _Types.Length || lt.Type == LexTokenTypes.EOF)
{
break;
}
_Types[ci++] = GetTypeOfString(lt.Value);
}
FillData(ll);
}
else
{ // no first row! assume all the column types are string
for (int ci = 0; ci < _Types.Length; ci++)
{
_Types[ci] = tstring;
}
}
if (behavior == CommandBehavior.SchemaOnly)
{
_sr.Close();
_sr = null;
}
}
public TxtCommand(TxtConnection conn)
{
_tc = conn;
}
