public override IExtents GetExtents()
{
using (IDbConnection conn = DbUtility.CreateConnection(ConnectionString))
using (IDbCommand cmd = DbUtility.CreateCommand())
{
conn.Open();
cmd.Connection = conn;
cmd.CommandText = String.Format(
"SELECT " +
"min({0}.ST_MINX(tbl.\"{3}\")) AS xmin, min({0}.ST_MINY(tbl.\"{3}\")) AS ymin, " +
"max({0}.ST_MAXX(tbl.\"{3}\")) AS xmax, max({0}.ST_MAXY(tbl.\"{3}\")) AS ymax " +
"FROM \"{1}\".\"{2}\" AS tbl;",
DB2SpatialExtenderProviderStatic.DefaultSpatialSchema,
TableSchema,
Table,
GeometryColumn);
cmd.CommandType = CommandType.Text;
using (DB2DataReader r = (DB2DataReader)cmd.ExecuteReader(CommandBehavior.CloseConnection))
{
while (r.Read())
{
if (r.IsDBNull(0) || r.IsDBNull(1) || r.IsDBNull(2) || r.IsDBNull(3))
{
return(GeometryFactory.CreateExtents());
}
double xmin = r.GetDouble(0);
double ymin = r.GetDouble(1);
double xmax = r.GetDouble(2);
double ymax = r.GetDouble(3);
IExtents ext = GeometryFactory.CreateExtents2D(
r.GetDouble(0), r.GetDouble(1),
r.GetDouble(2), r.GetDouble(3));
return(ext);
}
}
return(GeometryFactory.CreateExtents());
}
}