public void ReplacePlaceHolders(QueryGenerator generator)
{
for (int i = 0; i < _QueryComponents.Count; i++)
{
if (_QueryComponents[i] is PlaceHolderComponent)
{
_QueryComponents[i] = generator;
}
//Diese Variante endet sehr bald einen Stackoverflow --> keine Rekursion
//else if (_QueryComponents[i] is QueryGenerator)
//{
// ((QueryGenerator)_QueryComponents[i]).ReplacePlaceHolders(generator);
//}
}
//Iteratives Vorgehen vermeidet den StachOverflow
List<QueryComponent> tmp = new List<QueryComponent>();
foreach (QueryComponent c in _QueryComponents)
{
if (c is QueryGenerator)
{
tmp.AddRange(((QueryGenerator)c)._QueryComponents);
}
else
{
tmp.Add(c);
}
}
_QueryComponents = tmp;
}
protected StringBuilder ComputeSqlJoin(Serializer.Serializer serializer, IList<Type> path, String restriction, String target)
{
AttributeWorker w = AttributeWorker.GetInstance(target);
QueryGenerator ret = new QueryGenerator();
ret.AddQueryComponent(new PlaceHolderComponent());
//StringBuilder b = new StringBuilder();
//b.Append(" @@@");
for (int i = 0; i < path.Count - 1; i++)
{
Type from = path[i];
Type to = path[i + 1];
//if (i > 0)
//{
// b.Replace(" @@@", " WHERE @@@");
//}
IVirtualKey vKey = w.CreateVirtualKey(serializer, from, to);
QueryGenerator gen1 = vKey.ToSqlRestriction(target, from, to, serializer);
ret.ReplacePlaceHolders(gen1);
//b.Replace(" @@@", vKey.ToSqlRestriction(target, from, to));
if (i==path.Count-2)
{
QueryGenerator gen2 = new QueryGenerator();
gen2.AddQueryComponent(new SqlStringComponent(" WHERE "));
gen2.AddQueryComponent(new SqlStringComponent(restriction));
ret.ReplacePlaceHolders(gen2);
//b.Replace(" @@@", " WHERE @@@");
//b.Replace(" @@@", restriction);
}
}
if (path.Count == 1)
{
QueryGenerator gen3 = new QueryGenerator();
gen3.AddQueryComponent(new SqlStringComponent(" WHERE "));
gen3.AddQueryComponent(new SqlStringComponent(restriction));
ret.ReplacePlaceHolders(gen3);
//b.Replace(" @@@", " WHERE @@@");
//b.Replace(" @@@", restriction);
}
//Entferne das führende " WHERE "
return ret.ToSqlString();
//return b.Remove(0,7);
}