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I've noticed that SQL clients select the SHAPE column from SDE.ST_GEOMETRY in different ways:

select shape from roads 
  • Toad: SDE.ST_GEOMETRY(1,1,666666.0,4444444.5,666666.0,4444444.5,NULL,NULL,NULL,NULL,0,0,300051,(BLOB))
  • SQL Developer: [SDE.ST_GEOMETRY]
  • MS Access: Error: Invalid field definition 'SHAPE' in definition of index or relationship. (I know MS Access isn't a real SQL client; but it helps demonstrate the point.)

Question:

What does the text that is returned from Toad represent? Is it the properties of the blob?

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TOAD writes out the meta data of Oracles ST_GEOMETRY UDT implementation for ESRIs SDE; it's essentially a list of geometric predicates describing the geometry, and the vertex array that builds the geometry type, held as BLOB:

ST_GEOMETRY(
  <ENTITY>,    -- geometry type (POINT, LINESTRING, ...)
  <NUMPTS>,    -- number of points
  <MINX>,      -- coordinates of the envelope (bbox)
  <MINY>,      -- ^
  <MAXX>,      -- ^
  <MAXY>,      -- ^
  <MINZ>,      -- range of Z values
  <MAXZ>,      -- ^
  <MINM>,      -- range of M values
  <MAXM>,      -- ^
  <AREA>,      -- area in CRS units (if any)
  <LEN>,       -- length in CRS units (if any)
  <SRID>,      -- CRS identifier
  <POINT_BLOB> -- vertex storage
)

as described in detail in ST_Geometry storage in Oracle.

| improve this answer | |
  • I'm kind of surprised that TOAD dev team would have gone out of their way to do this (account for ESRI's implementation of ST_GEOMETRY). – User1973 Sep 18 at 22:44

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