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DB2-specific Geography Tasks

Description

DB2 examples for creating and dropping tables with geometry columns, inserting location data values, inserting line data values, and inserting polygon data values.

Enabling DB2 Spatial Extender

Before you can use geometry columns you must install DB2 Spatial Extender. On Windows, using the Typical configuration DOES NOT install DB2 Spatial Extender. You must also enable DB2 Spatial Extender for each database that will contain geography data. You can use the command "db2se enable_db mydatabase" in the DB2 command line tool to do this.
In the samples below, :SRID indicates the optional spatial reference identifier argument. For DB2, the default is 1003.

Creating and Dropping Tables with Geometry Columns

Creating a table with geometry columns:

CREATE TABLE GeogTest
(
KeyValue	VARCHAR(25) NOT NULL,
Location	DB2GSE.ST_GEOMETRY NOT NULL,
PRIMARY KEY (KeyValue))

Dropping a table:

DROP TABLE GeogTest

Inserting Location Data Values

Inserting location data using Portable SQL Syntax:

INSERT INTO GeogTest (KeyValue, Location) 
    values('Item1', GeogCreateLocation(-70, 42, :SRID))

Inserting location data using Native syntax:

INSERT INTO GeogTest  (KeyValue, Location) 
    VALUES ('Item1', DB2GSE.ST_Point(
    CAST( - 70 AS DOUBLE), CAST(42 AS DOUBLE), CAST(:SRID AS INTEGER)))

Inserting Line Data Values

Inserting line data values using Portable SQL Syntax:

INSERT INTO GeogTest (KeyValue, Location) 
    values('Item2', GeogCreateLine(-70, 42, -70, 38, :SRID))

Inserting line data values using Native SQL Syntax:

INSERT INTO GeogTest  (KeyValue, Location) 
    VALUES ('Item2', DB2GSE.ST_Geometry(
    'LINESTRING(' || CAST( - 70 as VARCHAR(50)) || ' ' || 
    CAST(42 as VARCHAR(50)) || ', ' || 
    CAST( - 70 as VARCHAR(50)) || ' ' || 
    CAST(38 as VARCHAR(50)) || ')', :SRID))

Inserting Polygon Data Values

Inserting polygon values using Portable SQL Syntax:

INSERT INTO GeogTest (KeyValue, Location) values('Item3', 
    GeogCreatePolygon(-70, 42, -70, 32, -60, 32, -60, 42, -70, 42, :SRID))

Inserting polygon values using Native SQL Syntax:

INSERT INTO GeogTest  (KeyValue, Location) 
   VALUES ('Item3', DB2GSE.ST_Geometry('POLYGON((' 
   || CAST( - 70 as VARCHAR(50))
   || ' ' || CAST(42 as VARCHAR(50)) || ', ' || CAST( - 70 as VARCHAR(50))
   || ' ' || CAST(32 as VARCHAR(50)) || ', ' || CAST( - 60 as VARCHAR(50))
   || ' ' || CAST(32 as VARCHAR(50)) || ', ' || CAST( - 60 as VARCHAR(50))
   || ' ' || CAST(42 as VARCHAR(50)) || ', ' || CAST( - 70 as VARCHAR(50))
   || ' ' || CAST(42 as VARCHAR(50)) || '))', :SRID))

See Also