cola.sql

《Oracle Spatial与OCI高级编程》相关配套源码。介绍了Oracle数据库中的两项关键开发技术Oracle Spatial以及OCI(Oracle Call Interface)。

-- 2003-03-03
-- Create a table for cola (soft drink) markets in a
-- given geography (such as city or state).
-- Each row will be an area of interest for a specific
-- cola (for example, where the cola is most preferred
-- by residents, where the manufacturer believes the
-- cola has growth potential, and so on).
CREATE TABLE cola_markets (
mkt_id NUMBER PRIMARY KEY,
name VARCHAR2(32),
shape MDSYS.SDO_GEOMETRY);
-- The next INSERT statement creates an area of interest for
-- Cola A. This area happens to be a rectangle.
-- The area could represent any user-defined criterion: for
-- example, where Cola A is the preferred drink, where
-- Cola A is under competitive pressure, where Cola A
-- has strong growth potential, and so on.
INSERT INTO cola_markets VALUES(
1,
’cola_a’,
MDSYS.SDO_GEOMETRY(
2003, -- 2-dimensional polygon
NULL,
NULL,
MDSYS.SDO_ELEM_INFO_ARRAY(1,1003,3), -- one rectangle (1003 = exterior)
MDSYS.SDO_ORDINATE_ARRAY(1,1, 5,7) -- only 2 points needed to
-- define rectangle (lower left and upper right) with
-- Cartesian-coordinate data
)
);
-- The next two INSERT statements create areas of interest for
-- Cola B and Cola C. These areas are simple polygons (but not
-- rectangles).
INSERT INTO cola_markets VALUES(
2,
’cola_b’,
MDSYS.SDO_GEOMETRY(
2003, -- 2-dimensional polygon
NULL,NULL,
MDSYS.SDO_ELEM_INFO_ARRAY(1,1003,1), -- one polygon (exterior polygon ring)
MDSYS.SDO_ORDINATE_ARRAY(5,1, 8,1, 8,6, 5,7, 5,1)
)
);
INSERT INTO cola_markets VALUES(
3,
’cola_c’,
MDSYS.SDO_GEOMETRY(
2003, -- 2-dimensional polygon
NULL,
NULL,
MDSYS.SDO_ELEM_INFO_ARRAY(1,1003,1), -- one polygon (exterior polygon ring)
MDSYS.SDO_ORDINATE_ARRAY(3,3, 6,3, 6,5, 4,5, 3,3)
)
);
-- Now insert an area of interest for Cola D. This is a
-- circle with a radius of 2. It is completely outside the
-- first three areas of interest.
INSERT INTO cola_markets VALUES(
4,
’cola_d’,
MDSYS.SDO_GEOMETRY(
2003, -- 2-dimensional polygon
NULL,
NULL,
MDSYS.SDO_ELEM_INFO_ARRAY(1,1003,4), -- one circle
MDSYS.SDO_ORDINATE_ARRAY(8,7, 10,9, 8,11)
)
);
---------------------------------------------------------------------------
-- UPDATE METADATA VIEW --
---------------------------------------------------------------------------
-- Update the USER_SDO_GEOM_METADATA view. This is required
-- before the Spatial index can be created. Do this only once for each
-- layer (that is, table-column combination; here: COLA_MARKETS and SHAPE).
INSERT INTO USER_SDO_GEOM_METADATA
VALUES (
’cola_markets’,
’shape’,MDSYS.SDO_DIM_ARRAY( -- 20X20 grid
MDSYS.SDO_DIM_ELEMENT(’X’, 0, 20, 0.005),
MDSYS.SDO_DIM_ELEMENT(’Y’, 0, 20, 0.005)
),
NULL -- SRID
);
-------------------------------------------------------------------
-- CREATE THE SPATIAL INDEX --
-------------------------------------------------------------------
CREATE INDEX cola_spatial_idx
ON cola_markets(shape)
INDEXTYPE IS MDSYS.SPATIAL_INDEX;
-- Preceding created an R-tree index.
-- Following line was for an earlier quadtree index:
-- PARAMETERS(’SDO_LEVEL = 8’);
-------------------------------------------------------------------
-- PERFORM SOME SPATIAL QUERIES --
-------------------------------------------------------------------
-- Return the topological intersection of two geometries.
SELECT SDO_GEOM.SDO_INTERSECTION(c_a.shape, c_c.shape, 0.005)
FROM cola_markets c_a, cola_markets c_c
WHERE c_a.name = 'cola_a' AND c_c.name = 'cola_c';
-- Do two geometries have any spatial relationship?
SELECT SDO_GEOM.RELATE(c_b.shape, 'anyinteract', c_d.shape, 0.005)
FROM cola_markets c_b, cola_markets c_d
WHERE c_b.name = 'cola_b' AND c_d.name = 'cola_d';
-- Return the areas of all cola markets.
SELECT name, SDO_GEOM.SDO_AREA(shape, 0.005) FROM cola_markets;
-- Return the area of just cola_a.
SELECT c.name, SDO_GEOM.SDO_AREA(c.shape, 0.005) FROM cola_markets c
WHERE c.name = 'cola_a';
-- Return the distance between two geometries.
SELECT SDO_GEOM.SDO_DISTANCE(c_b.shape, c_d.shape, 0.005)
FROM cola_markets c_b, cola_markets c_d
WHERE c_b.name = 'cola_b' AND c_d.name = 'cola_d';
-- Is a geometry valid?
SELECT c.name, SDO_GEOM.VALIDATE_GEOMETRY(c.shape, 0.005)
FROM cola_markets c WHERE c.name = 'cola_c';
-- Is a layer valid? (First, create the results table.)
CREATE TABLE validation_results (mkt_id number, result varchar2(10));
EXECUTE SDO_GEOM.VALIDATE_LAYER(’COLA_MARKETS’, ’SHAPE’, ’MKT_ID’,
’VALIDATION_RESULTS’);
SELECT * from validation_results;