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ogo11:gql:exo1
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| Both sides previous revision Previous revision Next revision | Previous revision | ||
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ogo11:gql:exo1 [2013/04/25 09:01] oertz |
ogo11:gql:exo1 [2014/05/15 14:13] oertz [GQL :: EXO1] |
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| Line 8: | Line 8: | ||
| Alimentation avec quelques géométries //en dur// : | Alimentation avec quelques géométries //en dur// : | ||
| <code> | <code> | ||
| - | INSERT INTO test VALUES ( 3, 'batiment 1', GeometryFromText( 'POLYGON((10 10,40 20,35 8,12 4,10 10))', -1 ) ); | + | INSERT INTO test VALUES ( 3, 'batiment 1', ST_GeometryFromText( 'POLYGON((10 10,40 20,35 8,12 4,10 10))', -1 ) ); |
| - | INSERT INTO test VALUES ( 4, 'batiment 2', GeometryFromText( 'POLYGON((10 40,20 30,30 40,40 35,50 60,35 80,20 60,10 40))', -1 ) ); | + | INSERT INTO test VALUES ( 4, 'batiment 2', ST_GeometryFromText( 'POLYGON((10 40,20 30,30 40,40 35,50 60,35 80,20 60,10 40))', -1 ) ); |
| - | INSERT INTO test VALUES ( 5, 'batiment 3', GeometryFromText( 'POLYGON((10 95,20 95,20 135,10 135,10 95))', -1 ) ); | + | INSERT INTO test VALUES ( 5, 'batiment 3', ST_GeometryFromText( 'POLYGON((10 95,20 95,20 135,10 135,10 95))', -1 ) ); |
| - | INSERT INTO test VALUES ( 1, 'pieton 1', GeometryFromText( 'POINT(10 70)', -1 ) ); | + | INSERT INTO test VALUES ( 1, 'pieton 1', ST_GeometryFromText( 'POINT(10 70)', -1 ) ); |
| - | INSERT INTO test VALUES ( 2, 'pieton 2', GeometryFromText( 'POINT(30 30)', -1 ) ); | + | INSERT INTO test VALUES ( 2, 'pieton 2', ST_GeometryFromText( 'POINT(30 30)', -1 ) ); |
| - | INSERT INTO test VALUES ( 6, 'pieton 3', GeometryFromText( 'POINT(35 70)', -1 ) ); | + | INSERT INTO test VALUES ( 6, 'pieton 3', ST_GeometryFromText( 'POINT(35 70)', -1 ) ); |
| - | INSERT INTO test VALUES ( 7, 'pieton 4', GeometryFromText( 'POINT(35 60)', -1 ) ); | + | INSERT INTO test VALUES ( 7, 'pieton 4', ST_GeometryFromText( 'POINT(35 60)', -1 ) ); |
| - | INSERT INTO test VALUES ( 8, 'bordure 1 route', GeometryFromText( 'LINESTRING(1 85,50 85)', -1 ) ); | + | INSERT INTO test VALUES ( 8, 'bordure 1 route', ST_GeometryFromText( 'LINESTRING(1 85,50 85)', -1 ) ); |
| - | INSERT INTO test VALUES ( 9, 'bordure 2 route', GeometryFromText( 'LINESTRING(1 92,50 92)', -1 ) ); | + | INSERT INTO test VALUES ( 9, 'bordure 2 route', ST_GeometryFromText( 'LINESTRING(1 92,50 92)', -1 ) ); |
| - | </code> | + | |
| - | + | ||
| - | Comment sont stockées les géodonnées ? | + | |
| - | <code> | + | |
| - | SELECT AsText(the_geom), Srid(the_geom), the_geom FROM pedestrians; | + | |
| - | </code> | + | |
| - | d'où la syntaxe "lisible" que nous utilisons ci-dessus : | + | |
| - | <code> | + | |
| - | SELECT GeometryFromText('POLYGON((10 10,40 20,35 8,12 4,10 10))', -1 ); | + | |
| </code> | </code> | ||
| ===== Premiers pas en GQL ===== | ===== Premiers pas en GQL ===== | ||
| Line 51: | Line 42: | ||
| </code> | </code> | ||
| * **4. Quel est l'objet géométrique le plus proche du pieton 2 ?** -> ST_Distance | * **4. Quel est l'objet géométrique le plus proche du pieton 2 ?** -> ST_Distance | ||
| - | <code>...</code> | + | <code> |
| + | SELECT t1.genre FROM test t1, test t2 WHERE | ||
| + | t2.genre LIKE 'pieton 2' | ||
| + | AND | ||
| + | ST_Distance(t1.geom,t2.geom) = | ||
| + | ( | ||
| + | SELECT min(ST_Distance(t1.geom, t2.geom)) FROM test t1, test t2 | ||
| + | WHERE t1.genre LIKE 'pieton 2' AND t2.genre <> 'pieton 2' | ||
| + | ) | ||
| + | </code> | ||
| //(source: [[http://www.davidgis.fr|Jean David Techer]])// | //(source: [[http://www.davidgis.fr|Jean David Techer]])// | ||
ogo11/gql/exo1.txt · Last modified: 2018/05/15 17:18 (external edit)
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