1、創建數據表station,包含geometry字段:
CREATE TABLE "public"."station" (
"name" varchar(20) COLLATE "pg_catalog"."default",
"lat" float4,
"lon" float4,
"geometry" "public"."geometry",
"code" varchar(4) COLLATE "pg_catalog"."default" NOT NULL,
CONSTRAINT "station_pkey" PRIMARY KEY ("code")
)
2、程序創建表格記錄時,應用SQL語句:
sSQL = "INSERT INTO station(lat, lon, geometry) " + \
"VALUES(%f,%f, ST_GeomFromText('POINT(%f %f)', 4326))" \
% (lat, lon, lon, lat)
代碼用於python,注意最後創建點數據的經緯數值輸入採用的是:(lon lat) 的方式
參數:4326,表示的是地理投影座標系統,代表地理座標系中的GCS_WGS_1984
3、如需增補空間座標值,採用SQL語句:update
update station as a set geometry =
ST_GeomFromText('POINT('||(select lon || ' ' || lat from station
where id =a.id)||')', 4326)
該語句可直接在Navicat for PostgreSQL中運行。