async public Task <IFeatureCursor> GetFeatures(IQueryFilter filter)
{
if (filter is ISpatialFilter)
{
filter = SpatialFilter.Project(filter as ISpatialFilter, this.SpatialReference);
}
return(await FeatureCursor.Create(_etcon, filter, this));
}
async static public Task <FeatureCursor> Create(EventTableConnection etconn, IQueryFilter filter, IFeatureClass fc)
{
var cursor = new FeatureCursor(etconn, filter);
cursor._etcon = etconn;
if (etconn != null)
{
CommonDbConnection conn = new CommonDbConnection();
conn.ConnectionString2 = etconn.DbConnectionString.ConnectionString;
string appendWhere = String.Empty;
if (filter is ISpatialFilter &&
((ISpatialFilter)filter).Geometry != null)
{
if (!(((ISpatialFilter)filter).Geometry is Envelope))
{
cursor._addShape = true;
filter.AddField("#SHAPE#");
cursor._spatialFilter = (ISpatialFilter)filter;
}
IEnvelope env = ((ISpatialFilter)filter).Geometry.Envelope;
appendWhere =
etconn.XFieldName + ">=" + env.minx.ToString(_nhi) + " AND " +
etconn.XFieldName + "<=" + env.maxx.ToString(_nhi) + " AND " +
etconn.YFieldName + ">=" + env.miny.ToString(_nhi) + " AND " +
etconn.YFieldName + "<=" + env.maxy.ToString(_nhi);
}
if (filter is IRowIDFilter)
{
IRowIDFilter idFilter = (IRowIDFilter)filter;
appendWhere = idFilter.RowIDWhereClause;
}
string where = (filter != null) ? filter.WhereClause : String.Empty;
if (!String.IsNullOrEmpty(where))
{
where += (String.IsNullOrEmpty(appendWhere) ? String.Empty : " AND (" + appendWhere + ")");
}
else
{
where = appendWhere;
}
StringBuilder sb = new StringBuilder();
sb.Append(filter.SubFieldsAndAlias);
foreach (string fieldname in filter.SubFields.Split(' '))
{
if (fieldname == "#SHAPE#")
{
if (sb.Length > 0)
{
sb.Append(",");
}
sb.Append(cursor._etcon.XFieldName + "," + cursor._etcon.YFieldName);
cursor._addShape = true;
}
if (fieldname == "*")
{
cursor._addShape = true;
}
}
string fields = sb.ToString().Replace(",#SHAPE#", "").Replace("#SHAPE#,", "").Replace("#SHAPE#", "");
//_tab = conn.Select(sb.ToString(), etconn.TableName, where);
//_addShape = _tab.Columns.Contains(_etcon.XFieldName) &&
// _tab.Columns.Contains(_etcon.YFieldName);
var limits = conn.LimitResults(filter, fc);
var dataReaderResult = await conn.DataReaderAsync("select " + limits.top + fields + " from " + etconn.TableName + (String.IsNullOrEmpty(where) ? String.Empty : " WHERE " + where) + limits.limit);
cursor._dbReader = dataReaderResult.reader;
cursor._dbConnection = dataReaderResult.connection;
}
return(cursor);
}