public IEnumerable <IFeature> GetFeatures(IEnvelope bbox, string filter, double scale)
{
//are we cached?
Polygon p = null;
foreach (IEnvelope area in m_cachedareas.Query(bbox))
{
if (p == null)
{
p = ConvertEnvelopeToPolygon(area);
}
else
{
p.Union(ConvertEnvelopeToPolygon(area));
}
}
if (p != null && p.Covers(ConvertEnvelopeToPolygon(bbox)))
{
//load from cache
LinkedList <IFeature> ret = new LinkedList <IFeature>();
m_objects.Query(bbox, new FeatureLinkedListVisitor(ret));
return(ret);
}
OpenConnection();
//load from DB
IDbCommand cmd = m_conn.CreateCommand();
cmd.CommandText = "SELECT " + m_PrimaryColumn + ", " + m_WKBColumn + " FROM " + m_tablename + " WHERE "
+ m_X1Column + " >= " + bbox.MinX.ToString(System.Globalization.CultureInfo.InvariantCulture) + " AND " + m_X1Column + " <= " + bbox.MaxX.ToString(System.Globalization.CultureInfo.InvariantCulture) + " AND " + m_Y1Column + " >= " + bbox.MinY.ToString(System.Globalization.CultureInfo.InvariantCulture) + " AND " + m_Y1Column + " <= " + bbox.MaxY.ToString(System.Globalization.CultureInfo.InvariantCulture) + " OR "
+ m_X2Column + " >= " + bbox.MinX.ToString(System.Globalization.CultureInfo.InvariantCulture) + " AND " + m_X2Column + " <= " + bbox.MaxX.ToString(System.Globalization.CultureInfo.InvariantCulture) + " AND " + m_Y1Column + " >= " + bbox.MinY.ToString(System.Globalization.CultureInfo.InvariantCulture) + " AND " + m_Y1Column + " <= " + bbox.MaxY.ToString(System.Globalization.CultureInfo.InvariantCulture) + " OR "
+ m_X2Column + " >= " + bbox.MinX.ToString(System.Globalization.CultureInfo.InvariantCulture) + " AND " + m_X2Column + " <= " + bbox.MaxX.ToString(System.Globalization.CultureInfo.InvariantCulture) + " AND " + m_Y2Column + " >= " + bbox.MinY.ToString(System.Globalization.CultureInfo.InvariantCulture) + " AND " + m_Y2Column + " <= " + bbox.MaxY.ToString(System.Globalization.CultureInfo.InvariantCulture) + " OR "
+ m_X1Column + " >= " + bbox.MinX.ToString(System.Globalization.CultureInfo.InvariantCulture) + " AND " + m_X1Column + " <= " + bbox.MaxX.ToString(System.Globalization.CultureInfo.InvariantCulture) + " AND " + m_Y2Column + " >= " + bbox.MinY.ToString(System.Globalization.CultureInfo.InvariantCulture) + " AND " + m_Y2Column + " <= " + bbox.MaxY.ToString(System.Globalization.CultureInfo.InvariantCulture);
IDataReader dr = null;
LinkedList <IFeature> fromdb = new LinkedList <IFeature>();
try
{
dr = cmd.ExecuteReader();
Topology.IO.WKBReader wkbreader = new Topology.IO.WKBReader();
int nmap = dr.GetOrdinal(m_WKBColumn);
int npk = dr.GetOrdinal(m_PrimaryColumn);
while (dr.Read())
{
IGeometry g = wkbreader.Read((byte[])dr.GetValue(nmap));
int pk = (int)dr.GetValue(npk);
SimpleFeature f = new SimpleFeature(g, m_areastyle, pk);
if (!m_PrimaryKeyIndex.ContainsKey(pk))
{
fromdb.AddLast(f);
m_PrimaryKeyIndex.Add(pk, f);
m_objects.Insert(g.EnvelopeInternal, f);
}
else
{
fromdb.AddLast(m_PrimaryKeyIndex[pk]);
}
}
}
catch (Exception ex)
{
throw new Exception("Couldn't load features\nError: " + ex.Message);
}
finally
{
if (dr != null)
{
dr.Close();
}
}
//add to cache
m_cachedareas.Insert(bbox, bbox);
return(fromdb);
}
public IEnumerable<IFeature> GetFeatures(IEnvelope bbox, string filter, double scale)
{
//are we cached?
Polygon p = null;
foreach (IEnvelope area in m_cachedareas.Query(bbox))
{
if (p == null) p = ConvertEnvelopeToPolygon(area);
else p.Union(ConvertEnvelopeToPolygon(area));
}
if(p != null && p.Covers(ConvertEnvelopeToPolygon(bbox)))
{
//load from cache
LinkedList<IFeature> ret = new LinkedList<IFeature>();
m_objects.Query(bbox, new FeatureLinkedListVisitor(ret));
return ret;
}
OpenConnection();
//load from DB
IDbCommand cmd = m_conn.CreateCommand();
cmd.CommandText = "SELECT " + m_PrimaryColumn + ", " + m_WKBColumn + " FROM " + m_tablename + " WHERE "
+ m_X1Column + " >= " + bbox.MinX.ToString(System.Globalization.CultureInfo.InvariantCulture) + " AND " + m_X1Column + " <= " + bbox.MaxX.ToString(System.Globalization.CultureInfo.InvariantCulture) + " AND " + m_Y1Column + " >= " + bbox.MinY.ToString(System.Globalization.CultureInfo.InvariantCulture) + " AND " + m_Y1Column + " <= " + bbox.MaxY.ToString(System.Globalization.CultureInfo.InvariantCulture) + " OR "
+ m_X2Column + " >= " + bbox.MinX.ToString(System.Globalization.CultureInfo.InvariantCulture) + " AND " + m_X2Column + " <= " + bbox.MaxX.ToString(System.Globalization.CultureInfo.InvariantCulture) + " AND " + m_Y1Column + " >= " + bbox.MinY.ToString(System.Globalization.CultureInfo.InvariantCulture) + " AND " + m_Y1Column + " <= " + bbox.MaxY.ToString(System.Globalization.CultureInfo.InvariantCulture) + " OR "
+ m_X2Column + " >= " + bbox.MinX.ToString(System.Globalization.CultureInfo.InvariantCulture) + " AND " + m_X2Column + " <= " + bbox.MaxX.ToString(System.Globalization.CultureInfo.InvariantCulture) + " AND " + m_Y2Column + " >= " + bbox.MinY.ToString(System.Globalization.CultureInfo.InvariantCulture) + " AND " + m_Y2Column + " <= " + bbox.MaxY.ToString(System.Globalization.CultureInfo.InvariantCulture) + " OR "
+ m_X1Column + " >= " + bbox.MinX.ToString(System.Globalization.CultureInfo.InvariantCulture) + " AND " + m_X1Column + " <= " + bbox.MaxX.ToString(System.Globalization.CultureInfo.InvariantCulture) + " AND " + m_Y2Column + " >= " + bbox.MinY.ToString(System.Globalization.CultureInfo.InvariantCulture) + " AND " + m_Y2Column + " <= " + bbox.MaxY.ToString(System.Globalization.CultureInfo.InvariantCulture);
IDataReader dr = null;
LinkedList<IFeature> fromdb = new LinkedList<IFeature>();
try
{
dr = cmd.ExecuteReader();
Topology.IO.WKBReader wkbreader = new Topology.IO.WKBReader();
int nmap = dr.GetOrdinal(m_WKBColumn);
int npk = dr.GetOrdinal(m_PrimaryColumn);
while (dr.Read())
{
IGeometry g = wkbreader.Read((byte[])dr.GetValue(nmap));
int pk = (int)dr.GetValue(npk);
SimpleFeature f = new SimpleFeature(g, m_areastyle, pk);
if (!m_PrimaryKeyIndex.ContainsKey(pk))
{
fromdb.AddLast(f);
m_PrimaryKeyIndex.Add(pk, f);
m_objects.Insert(g.EnvelopeInternal, f);
}
else fromdb.AddLast(m_PrimaryKeyIndex[pk]);
}
}
catch (Exception ex)
{
throw new Exception("Couldn't load features\nError: " + ex.Message);
}
finally
{
if (dr != null) dr.Close();
}
//add to cache
m_cachedareas.Insert(bbox, bbox);
return fromdb;
}
