使用與參考手冊

範例程式片斷

看看下例如何建立索引並用於 SQL。關於 CREATE INDEX 和 CREATE INDEX EXTENSION 指令的其它資訊, 請參閱 SQL 參考手冊。 請注意:建立索引之後,您可以發出使用空間函數和述詞的標準 DDL 和 DML 陳述式。

create table customers (cid int, addr varchar(40), ..., loc db2gse.ST_Point)
create table stores (sid int, addr varchar(40), ..., loc db2gse.ST_Point, zone db2gse.ST_Polygon)
create index customersx1 on customers(loc) extend using spatial_index(10e0, 100e0, 1000e0)
create index storesx1 on stores(loc) extend using spatial_index(10e0, 100e0, 1000e0)
create index storesx2 on stores(zone) extend using spatial_index(10e0, 100e0, 1000e0)
 
insert into customers (cid, addr, loc) values (:cid, :addr, sdeFromBinary(:loc))
insert into customers (cid, addr, loc) values (:cid, :addr, geocode(:addr))
insert into stores (sid, addr, loc) values (:sid, :addr, sdeFromBinary(:loc))
 
update stores set zone = db2gse.ST_Buffer (loc, 2)
 
select cid, loc from customers
 where db2gse.ST_Within(loc, :polygon) = 1
 
select cid, loc from customers
 where db2gse.ST_Within(loc, :circle1) = 1 OR
       db2gse.ST_Within(loc, :circle2) = 1
 
select c.cid, loc from customers c, stores s
 where db2gse.ST_Contains(s.zone, c.loc) = 1 selectivity 0.01
 
select avg(c.income) from customers c
 where not exist (select * from stores s
                  where db2gse.ST_Distance(c.loc, s.loc) < 10)
 


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