ST_IsEmpty´Â ±âÇÏÇÐ ¿ÀºêÁ§Æ®¸¦ ÃëÇØ ¿ÀºêÁ§Æ®°¡ ºñ¾î ÀÖÀ¸¸é 1(TRUE)À» ¸®ÅÏÇÏ°í ±×·¸Áö ¾ÊÀ¸¸é 0(FALSE)À» ¸®ÅÏÇÕ´Ï´Ù.
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db2gse.ST_IsEmpty(g db2gse.ST_Geometry)
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Integer
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´ÙÀ½ÀÇ CREATE TABLE¹®Àº µÎ °³ÀÇ Ä÷³ÀÌ ÀÖ´Â EMPTY_TEST Å×À̺íÀ» ÀÛ¼ºÇÕ´Ï´Ù. GEOTYPE Ä÷³Àº G1 ±âÇÏÇÐ Ä÷³¿¡ ÀúÀåµÈ ¼ºêŬ·¡½ºÀÇ µ¥ÀÌÅÍ À¯ÇüÀ» ÀúÀåÇÕ´Ï´Ù.
CREATE TABLE EMPTY_TEST (geotype varchar(20), g1 db2gse.ST_Geometry)
´ÙÀ½ÀÇ INSERT¹®Àº ±âÇÏÇÐ ¼ºêŬ·¡½º Á¡, ¼±½ºÆ®¸µ ¹× ´Ù°¢Çü¿¡ ´ëÇØ µÎ ·¹Äڵ带 »ðÀÔÇÕ´Ï´Ù. ÇÑ ·¹ÄÚµå´Â ºñ¾î ÀÖ°í ÇÑ ·¹ÄÚµå´Â ºñ¾î ÀÖÁö ¾Ê½À´Ï´Ù.
INSERT INTO EMPTY_TEST VALUES('Point', db2gse.ST_PointFromText('point (10.02 20.01)', db2gse.coordref()..srid(0))) INSERT INTO EMPTY_TEST VALUES('Point', db2gse.ST_PointFromText('point empty', db2gse.coordref()..srid(0))) INSERT INTO EMPTY_TEST VALUES('Linestring', db2gse.ST_LineFromText('linestring (10.02 20.01, 10.32 23.98, 11.92 25.64)', db2gse.coordref()..srid(0))) INSERT INTO EMPTY_TEST VALUES('Linestring', db2gse.ST_LineFromText('linestring empty', db2gse.coordref()..srid(0))) INSERT INTO EMPTY_TEST VALUES('Polygon', db2gse.ST_PolyFromText('polygon ((10.02 20.01,11.92 35.64, 25.02 34.15,19.15 33.94,10.02 20.01))', db2gse.coordref()..srid(0))) INSERT INTO EMPTY_TEST VALUES('Polygon', db2gse.ST_PolyFromText('polygon empty', db2gse.coordref()..srid(0)))
´ÙÀ½ÀÇ SELECT¹®°ú ÇØ´ç °á°ú ¼¼Æ®¿¡¼´Â GEOTYPE Ä÷³À¸·ÎºÎÅÍÀÇ ±âÇÏÇÐ À¯Çü°ú ST_IsEmpty ÇÔ¼öÀÇ °á°ú¸¦ º¸¿© ÁÝ´Ï´Ù.
SELECT geotype, db2gse.ST_IsEmpty(g1) "It is empty" FROM EMPTY_TEST GEOTYPE It is empty -------------------- ----------- ST_Point 0 ST_Point 1 ST_Linestring 0 ST_Linestring 1 ST_Polygon 0 ST_Polygon 1 6 record(s) selected.