The ST_GeomFromText() function

The geometry_test table contains the INTEGER gid column, which uniquely identifies each row, and the g1 column, which stores the geometry:

CREATE TABLE geometry_test (gid smallint,
                            g1  ST_Geometry);

The following INSERT statements insert the data into the gid and g1 columns of the geometry_test table. The ST_GeomFromText() function converts the text representation of each geometry into its corresponding instantiable subclass:

INSERT INTO geometry_test VALUES( 
   1,
   ST_GeomFromText('point (10.02 20.01)',1000) 
);

INSERT INTO geometry_test VALUES( 
   2, 
   ST_GeomFromText('linestring (10.01 20.01, 10.01 30.01, 10.01 40.01)',1000) 
);

INSERT INTO geometry_test VALUES( 
   3, 
   ST_GeomFromText('polygon ((10.02 20.01, 11.92 35.64, 25.02
34.15, 19.15 33.94, 10.02 20.01))',1000)
);

INSERT INTO geometry_test VALUES( 
   4, 
   ST_GeomFromText('multipoint (10.02 20.01,10.32 23.98,11.92 25.64)',1000) 
);

INSERT INTO geometry_test VALUES( 
   5, 
   ST_GeomFromText('multilinestring ((10.02 20.01, 10.32 23.98,
11.92 25.64),(9.55 23.75,15.36 30.11))',1000) 
);

INSERT INTO geometry_test VALUES( 
   6, 
   ST_GeomFromText('multipolygon (((10.02 20.01, 11.92 35.64,
25.02 34.15, 19.15 33.94, 10.02 20.01)),((51.71 21.73, 73.36
27.04, 71.52 32.87, 52.43 31.90, 51.71 21.73)))',1000)
);