假設我們的表中有一個geometry字段用於存貯空間信息,並且已經建立的空間索引,我這裏用的是投影座標,而不是經緯度,如果是經緯度,簡單換一下座標就可以了。簡單查詢示例如下
(1)空間矩形範圍查詢:
最簡單:SELECT NAME,ASTEXT(GEOMETRY) AS GEOMETRY FROM fac_point t WHERE X(t.geometry) >0 AND X(t.geometry) <80000 AND Y(t.GEOMETRY) >0 AND Y(t.GEOMETRY) <80000;
通過空間函數獲得:SELECT NAME,ASTEXT(GEOMETRY) AS GEOMETRY FROM fac_point t WHERE INTERSECTS(GEOMETRY,ST_Envelope(ST_GeomFromText('LineString(45000 45000,60000 60000)')));
(2)空間多邊形範圍內查詢:
注意polygon的第一個座標和最後一個座標要一致。
SELECT NAME,ASTEXT(GEOMETRY) AS GEOMETRY FROM fac_point t WHERE ST_Intersects(GEOMETRY,ST_GeomFromText('POLYGON((44270 58295,45185 60857,46687 59760,46659 57792,45332 57069,44270 58295))'));
SELECT NAME,ASTEXT(GEOMETRY) AS GEOMETRY FROM fac_point t WHERE ST_Within(GEOMETRY,ST_GeomFromText('POLYGON((44270 58295,45185 60857,46687 59760,45659 57792,45332 57069,44270 58295))'));
(3)空間圓內查詢:
SELECT NAME,ASTEXT(GEOMETRY) AS GEOMETRY FROM fac_point t WHERE ST_Distance(GEOMETRY,ST_GeomFromText('POINT(44270 58295)'))<=500;