Packages
geo
1.3.0
4.1.0
4.0.1
4.0.0
3.6.0
3.5.1
3.5.0
3.4.3
3.4.2
3.4.1
3.4.0
3.3.8
3.3.7
3.3.5
3.3.4
3.3.3
3.3.2
3.3.1
3.3.0
3.2.0
3.1.0
3.0.0
2.1.0
2.0.0
1.5.0
1.4.1
1.4.0
1.3.1
1.3.0
1.2.1
1.2.0
1.1.2
1.1.1
1.1.0
1.0.6
1.0.5
1.0.4
1.0.3
1.0.2
1.0.1
1.0.0
0.18.0
0.17.0
0.16.1
0.16.0
0.15.2
0.15.1
0.15.0
0.14.0
0.13.0
0.12.0
0.11.2
0.11.1
0.11.0
0.10.1
0.10.0
0.9.3
0.9.2
0.9.1
0.9.0
0.8.0
0.7.2
0.7.1
0.6.1
0.5.1
Encodes and decodes WKB, WKT, and GeoJSON formats.
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lib/geo/postgis/extension.ex
if Code.ensure_loaded?(Postgrex.Extension) do
defmodule Geo.PostGIS.Extension do
@behaviour Postgrex.Extension
@moduledoc """
PostGIS extension for Postgrex. Supports Geometry and Geography data types
#Create a new Postgrex Types module:
Postgrex.Types.define(MyApp.PostgresTypes, [Geo.PostGIS.Extension], [])
#If using with Ecto, you may want something like thing instead
Postgrex.Types.define(MyApp.PostgresTypes,
[Geo.PostGIS.Extension] ++ Ecto.Adapters.Postgres.extensions(),
json: Poison)
opts = [hostname: "localhost", username: "postgres", database: "geo_postgrex_test",
types: MyApp.PostgresTypes ]
[hostname: "localhost", username: "postgres", database: "geo_postgrex_test",
types: MyApp.PostgresTypes]
{:ok, pid} = Postgrex.Connection.start_link(opts)
{:ok, #PID<0.115.0>}
geo = %Geo.Point{coordinates: {30, -90}, srid: 4326}
%Geo.Point{coordinates: {30, -90}, srid: 4326}
{:ok, _} = Postgrex.Connection.query(pid, "CREATE TABLE point_test (id int, geom geometry(Point, 4326))")
{:ok, %Postgrex.Result{columns: nil, command: :create_table, num_rows: 0, rows: nil}}
{:ok, _} = Postgrex.Connection.query(pid, "INSERT INTO point_test VALUES ($1, $2)", [42, geo])
{:ok, %Postgrex.Result{columns: nil, command: :insert, num_rows: 1, rows: nil}}
Postgrex.Connection.query(pid, "SELECT * FROM point_test")
{:ok, %Postgrex.Result{columns: ["id", "geom"], command: :select, num_rows: 1,
rows: [{42, %Geo.Point{coordinates: {30.0, -90.0}, srid: 4326}}]}}
"""
def init(opts) do
Keyword.get(opts, :decode_binary, :reference)
end
def matching(_) do
[type: "geometry", type: "geography"]
end
def format(_) do
:text
end
def encode(_opts) do
quote location: :keep do
%x{} = geom when x in [Geo.GeometryCollection, Geo.LineString, Geo.MultiLineString, Geo.MultiPoint, Geo.MultiPolygon, Geo.Point, Geo.Polygon] ->
data = Geo.WKT.encode(geom)
[<<IO.iodata_length(data) :: int32>> | data]
end
end
def decode(:reference) do
quote location: :keep do
<<len :: int32, wkb :: binary-size(len)>> ->
Geo.WKB.decode(wkb)
end
end
def decode(:copy) do
quote location: :keep do
<<len :: int32, wkb :: binary-size(len)>> ->
Geo.WKB.decode(:binary.copy(wkb))
end
end
end
end