元數據定義
1 CREATE OR REPLACE TYPE MDSYS.SDO_GEOMETRY AS OBJECT ( 2 SDO_GTYPE NUMBER, 3 SDO_SRID NUMBER, 4 SDO_POINT SDO_POINT_TYPE, 5 SDO_ELEM_INFO SDO_ELEM_INFO_ARRAY, 6 SDO_ORDINATES SDO_ORDINATE_ARRAY, 7 MEMBER FUNCTION GET_GTYPE 8 RETURN NUMBER DETERMINISTIC, 9 MEMBER FUNCTION GET_DIMS 10 RETURN NUMBER DETERMINISTIC, 11 MEMBER FUNCTION GET_LRS_DIM 12 RETURN NUMBER DETERMINISTIC) 13 14 ALTER TYPE SDO_GEOMETRY 15 ADD MEMBER FUNCTION GET_WKB RETURN BLOB DETERMINISTIC, 16 ADD MEMBER FUNCTION GET_WKT RETURN CLOB DETERMINISTIC, 17 ADD MEMBER FUNCTION ST_CoordDim RETURN SMALLINT DETERMINISTIC, 18 ADD MEMBER FUNCTION ST_IsValid RETURN INTEGER DETERMINISTIC, 19 ADD CONSTRUCTOR FUNCTION SDO_GEOMETRY(wkt IN CLOB, 20 srid IN INTEGER DEFAULT NULL) RETURN SELF AS RESULT, 21 ADD CONSTRUCTOR FUNCTION SDO_GEOMETRY(wkt IN VARCHAR2, 22 srid IN INTEGER DEFAULT NULL) RETURN SELF AS RESULT, 23 ADD CONSTRUCTOR FUNCTION SDO_GEOMETRY(wkb IN BLOB, 24 srid IN INTEGER DEFAULT NULL) RETURN SELF AS RESULT 25 CASCADE
創建表
create table test_geom(id int,geom MDSYS.SDO_GEOMETRY)
使用wkt插入表
insert into test_geom(id,geom) values(2,SDO_GEOMETRY('point(116.6 24.343)',4326))
查看空間數據的wkt
select a.geom.GET_WKT() from test_geom a
SDO_SRID定義了空間坐標參考系統。如果SDO_SRID為null，則沒有指定坐標系統，如果SDO_SRID不為null，那么它的值必須在在MDSYS.CS_SRS 表中的 SRID 列有對應的值，而且它的值必須插入USER_SDO_GEOM_METADATA視圖中。MDSYS.CS_SRS 表參考 圖2
| MDSYS.CS_SRS表 |
||
| 列名 |
類型 |
列名描述 |
| CS_NAME |
VARCHAR2(68) |
坐標系統名稱 |
| SRID |
NUMBER(38) |
空間參考ID，為唯一值。1-999999為spatial使用的空間參考，1000000以后為用戶自定義 |
| AUTH_SRID |
NUMBER(38) |
可選的SRID，是個外鍵。另一個坐標系統的SRID |
| AUTH_NAME |
VARCHAR2(256) |
|
| WKTEXT |
VARCHAR2(2046) |
|
| CS_BOUNDS |
MDSYS.SDO_GEOMETRY |
|
select *from MDSYS.CS_SRS，居然沒有3857
計算兩點間的距離
1 declare 2 v_point SDO_GEOMETRY; 3 v_ret number; 4 begin 5 v_point := SDO_GEOMETRY('point(114.6 12.343)',4326); 6 7 select SDO_GEOM.SDO_DISTANCE(a.geom, v_point, 0.005) 8 into v_ret 9 from test_geom a 10 where id=2; 11 12 dbms_output.put_line(v_ret); 13 end;
參考幫助
http://docs.oracle.com/database/121/SPATL/toc.htm
http://docs.oracle.com/cd/B28359_01/appdev.111/b28400/sdo_sql_mm.htm#SPATL025
http://docs.oracle.com/cd/B28359_01/appdev.111/b28400/sdo_objgeom.htm#SPATL120