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ST_IsValid

ST_IsValid´Â ST_Geometry¸¦ ÃëÇØ À¯È¿Çϸé 1(TRUE)À» ¸®ÅÏÇϰí, ±×·¸Áö ¾ÊÀ¸¸é 0(FALSE)À» ¸®ÅÏÇÕ´Ï´Ù. Spatial Extender´Â °ø°£ µ¥ÀÌÅ͸¦ ½ÂÀÎÇϱâ Àü¿¡ Ç×»ó À¯È¿¼ºÀ» °Ë»çÇϱ⠶§¹®¿¡ DB2 µ¥ÀÌÅͺ£À̽º¿¡ »ðÀÔµÈ ±âÇÏÇÐÀº Ç×»ó À¯È¿ÇÒ °ÍÀÔ´Ï´Ù. ±×·¯³ª, ´Ù¸¥ DBMS º¥´õµéÀº ÀÔ·ÂÀÇ À¯È¿¼ºÀ» °Ë»çÇÏÁö ¾ÊÀ» ¼öµµ ÀÖÀ¸¹Ç·Î ÀÀ¿ëÇÁ·Î±×·¥¿¡¼­ ´ë½Å ±× ÀÛ¾÷À» ¼öÇàÇØ¾ß ÇÕ´Ï´Ù.

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db2gse.ST_IsValid(g db2gse.ST_Geometry)

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Integer

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valid_test Å×À̺íÀº Ä÷³ geotype ¹× g1À¸·Î ÀÛ¼ºµË´Ï´Ù. geotype Ä÷³Àº g1 ±âÇÏÇÐ Ä÷³¿¡ ÀúÀåµÈ ±âÇÏÇÐ ¼­ºêŬ·¡½ºÀÇ À̸§À» ÀúÀåÇÕ´Ï´Ù.

CREATE TABLE valid_test (geotype varchar(20), g1 db2gse.ST_Geometry)

INSERT¹®Àº »ùÇà ¼­ºêŬ·¡½º¸¦ valid_test Å×ÀÌºí¿¡ »ðÀÔÇÕ´Ï´Ù.

INSERT INTO valid_test VALUES( 
    'Point', db2gse.ST_PointFromText('point (10.02 20.01)', 
    db2gse.coordref()..srid(0))
)
INSERT INTO valid_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 valid_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 valid_test VALUES(
'Multipoint', db2gse.ST_MPointFromText('multipoint (10.02 20.01,10.32 23.98,
11.92 25.64)', db2gse.coordref()..srid(0))
)
INSERT INTO valid_test VALUES(
'Multilinestring', db2gse.ST_MLineFromText('multilinestring ((10.02 20.01,
10.32 23.98,11.92 25.64),(9.55 23.75,15.36 30.11))',
db2gse.coordref()..srid(0))
)
INSERT INTO valid_test VALUES(
'Multipolygon', 
db2gse.ST_MPolyFromText('multipolygon (((10.02 20.01,11.92 35.64,
25.02 34.15,19.15 33.94,10.02 20.01)),((51.71 21.73,73.36 27.04,71.52 32.87,
52.43 31.90,51.71 21.73)))', db2gse.coordref()..srid(0)) 
)

´ÙÀ½ÀÇ SELECT¹®Àº ÇØ´ç geotypeÀÇ Â÷¿øÀ¸·Î geotype Ä÷³¿¡ ÀúÀåµÈ ¼­ºêŬ·¡½º À̸§À» ³ª¿­ÇÕ´Ï´Ù.

SELECT geotype, db2gse.ST_IsValid(g1) Valid FROM valid_test
GEOTYPE              Valid
-------------------- -------------
ST_Point                    1
ST_Linestring               1
ST_Polygon                  1
ST_Multipoint               1
ST_Multilinestring          1
ST_Multipolygon             1
6 record(s) selected.


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