public void ExecuteQuery()
{
ArrayList solutions = new ArrayList();
if (SolutionIsPossible)
{
MySqlDataReader dataReader = null;
try {
dataReader = itsTriples.ExecuteSqlQuery(itsQuerySql);
while (dataReader.Read())
{
QuerySolution solution = new QuerySolution();
int col = 0;
foreach (Variable var in itsSelectedVariables)
{
object resourceHash = dataReader.GetValue(col);
if (!resourceHash.Equals(DBNull.Value))
{
Resource resource = new Resource(Convert.ToInt32(resourceHash));
solution[var.Name] = resource;
int nodeHash = dataReader.GetInt32(col + 1);
char nodeType = dataReader.GetChar(col + 2);
string lexicalValue = dataReader.GetString(col + 3);
object rawSubValue = dataReader.GetValue(col + 4);
string subValue = null;
if (!rawSubValue.Equals(DBNull.Value))
{
subValue = (string)rawSubValue;
}
GraphMember node = null;
switch (nodeType)
{
case 'u':
node = new UriRef(lexicalValue);
break;
case 'b':
node = new BlankNode(nodeHash);
break;
case 'p':
node = new PlainLiteral(lexicalValue, subValue);
break;
case 't':
node = new TypedLiteral(lexicalValue, subValue);
break;
}
solution.SetNode(var.Name, node);
}
col += 5;
}
solutions.Add(solution);
}
}
catch (MySqlException e) {
throw new ApplicationException("Error executing '" + itsQuerySql + "' for query " + itsQuery, e);
}
finally {
if (null != dataReader)
{
dataReader.Close();
}
}
}
itsSolutions = solutions.GetEnumerator();
}
