SDO_UTIL.CONCAT

Format

SDO_UTIL.CONCAT_LINES(
     geometry1  IN SDO_GEOMETRY, 
     geometry2  IN SDO_GEOMETRY 
     ) RETURN SDO_GEOMETRY;

Description

Concatenates two line or multiline two-dimensional geometries to create a new geometry.

Parameters

geometry1: First geometry object for the concatenation operation.
geometry2: Second geometry object for the concatenation operation.

Usage Notes

Each input geometry must be a two-dimensional line or multiline geometry (that is, the SDO_GTYPE value must be 2002 or 2006). This function is not supported for LRS geometries. To concatenate LRS geometric segments, use the SDO_LRS.CONCATENATE_GEOM_SEGMENTS function (described in SDO_LRS Package (Linear Referencing System) ).

The input geometries must be line strings whose vertices are connected by straight line segments. Circular arcs and compound line strings are not supported.

If an input geometry is a multiline geometry, the elements of the geometry must be disjoint. If they are not disjoint, this function may return incorrect results.

The topological relationship between geometry1 and geometry2 must be DISJOINT or TOUCH; and if the relationship is TOUCH, the geometries must intersect only at two end points.

You can use the SDO_AGGR_CONCAT_LINES spatial aggregate function (described in Spatial Aggregate Functions) to concatenate multiple two-dimensional line or multiline geometries.

An exception is raised if geometry1 and geometry2 are based on different coordinate systems.

Examples

The following example concatenates two simple line string geometries.

-- Concatenate two touching lines: one from (1,1) to (5,1) and the
-- other from (5,1) to (8,1).
SELECT SDO_UTIL.CONCAT_LINES(
  SDO_GEOMETRY(2002, NULL, NULL, SDO_ELEM_INFO_ARRAY(1,2,1),
     SDO_ORDINATE_ARRAY(1,1, 5,1)),
  SDO_GEOMETRY(2002, NULL, NULL, SDO_ELEM_INFO_ARRAY(1,2,1),
     SDO_ORDINATE_ARRAY(5,1, 8,1))
  ) FROM DUAL;
 
SDO_UTIL.CONCAT_LINES(SDO_GEOMETRY(2002,NULL,NULL,SDO_ELEM_INFO_ARRAY(1,2,1),SDO
--------------------------------------------------------------------------------
SDO_GEOMETRY(2002, NULL, NULL, SDO_ELEM_INFO_ARRAY(1, 2, 1), SDO_ORDINATE_ARRAY(
1, 1, 5, 1, 8, 1))