oracle 的 SDO_GEOMETRY

Posted 2020-09-13 漂泊雪狼的博客

元数据定义

 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

创建表

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))

查看空间数据的wkt

select a.geom.GET_WKT() from test_geom a

 

 

 SDO_SRID定义了空间坐标参考系统。如果SDO_SRID为null，则没有指定坐标系统，如果SDO_SRID不为null，那么它的值必须在在MDSYS.CS_SRS 表中的 SRID 列有对应的值，而且它的值必须插入USER_SDO_GEOM_METADATA视图中。MDSYS.CS_SRS 表参考 图2

MDSYS.CS_SRS表
列名	类型	列名描述
CS_NAME	VARCHAR2(68)	坐标系统名称
SRID	NUMBER(38)	空间参考ID，为唯一值。1-999999为spatial使用的空间参考，1000000以后为用户自定义
AUTH_SRID	NUMBER(38)	可选的SRID，是个外键。另一个坐标系统的SRID
AUTH_NAME	VARCHAR2(256)
WKTEXT	VARCHAR2(2046)
CS_BOUNDS	MDSYS.SDO_GEOMETRY

 

 

 

 

 

 

 

 

 

 

 

 

select *from MDSYS.CS_SRS，居然没有3857

 

计算两点间的距离

 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;

 

参考帮助

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