如何将 POINTS(LANG, LAT) 存储到 PostGIS 中的几何类型列中？

Question

I have created a table itapp_cities in PostGIS which stores the data of cities. I have added a column location with datatype geometry to store longitude and latitude of a city. When I run the following INSERT query I get the error shown below.

INSERT query:

INSERT INTO itapp_cities(city_id, city_name, city_code, state_id, location) 
  VALUES (DEFAULT,'Ada', 'ada-ok',37,POINT(34.774531000000003, -96.678344899999999)); 

Table definition:

CREATE TABLE itapp_cities
(
  city_id bigserial NOT NULL,
  city_name character varying(100) NOT NULL,
  city_code character varying(5) NOT NULL DEFAULT ''::character varying,
  state_id bigint NOT NULL,
  location geometry,
  CONSTRAINT itapp_cities_pkey PRIMARY KEY (city_id),
  CONSTRAINT fk_states FOREIGN KEY (city_id)
      REFERENCES itapp_states (id) MATCH SIMPLE
      ON UPDATE NO ACTION ON DELETE CASCADE
)

Error:

 ERROR: column "location" is of type geometry but expression is of type point LINE 2: VALUES (DEFAULT,'Ada', 'ada-ok',37,POINT(34.77453100000000... ^ HINT: You will need to rewrite or cast the expression. ********** Error ********** ERROR: column "location" is of type geometry but expression is of type point SQL state: 42804

How can I store point values inside this column? I am new to PostGIS so forgive me for this silly question

Answer 1

Try this SQL and match it with your insert sql query

    INSERT INTO itapp_cities(city_id, city_name, slug, state_id, location) 
  VALUES (DEFAULT,'Ada', 'ada-ok',37,st_GeomFromText('POINT(34.774531000000003 -96.678344899999999)', 312));

for more details go through this link

Answer 2

You can use the function ST_MakePoint() and the set the SRID (Spatial Reference System Identifier) with ST_SetSRID() :

SELECT ST_SetSRID(ST_MakePoint(longitude, latitude),4326)

Or while you enter literal values anyway, feed the string representation to ST_GeomFromText() :

SELECT ST_GeomFromText('SRID=4326;POINT(34.774531 -96.6783449)')

Related answer on dba.SE with more details and links:

• Order by distance

Answer 3

According to the postGIS docs, your original insert was close. Just add ' around the POINT expression.

INSERT INTO itapp_cities(city_id, city_name, city_code, state_id, location) 
  VALUES (DEFAULT,'Ada', 'ada-ok',37,'POINT(34.774531000000003, -96.678344899999999)'); 

http://postgis.net/workshops/postgis-intro/geometries.html