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Pyscopg helpers to work with PostGIS.

Project description

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# psycopg-postgis

PostGIS helpers for psycopg2.

## Install

pip install psycopg-postgis

If you want a compiled version, first install cython:

pip install cython pip install psycopg-postgis

## Usage

You need to register the extension:

> import postgis > postgis.register(mydatabase.get_cursor())

Then you can pass python geometries instance to psycopg:

> cursor.execute(‘INSERT INTO table (geom) VALUES (%s)’, [Point(x=1, y=2, srid=4326)])

And retrieve data as python geometries instances:

> cursor.execute(‘SELECT geom FROM points LIMIT 1’) > geom = cursor.fetchone()[0] > geom <Point POINT(1.0 2.0)>

## Example

> import psycopg2 > from postgis import register, LineString > db = psycopg2.connect(dbname=”test”) > cursor = db.cursor() > register(cursor) > cursor.execute(‘CREATE TABLE IF NOT EXISTS mytable (“geom” geometry(LineString) NOT NULL)’) > cursor.execute(‘INSERT INTO mytable (geom) VALUES (%s)’, [LineString([(1, 2), (3, 4)], srid=4326)]) > cursor.execute(‘SELECT geom FROM mytable LIMIT 1’) > geom = cursor.fetchone()[0] > geom <LineString LINESTRING(1.0 2.0, 3.0 4.0)> > geom[0] <Point POINT(1.0 2.0)> > geom.coords ((1.0, 2.0), (3.0, 4.0)) > geom.geojson {‘coordinates’: ((1.0, 2.0), (3.0, 4.0)), ‘type’: ‘LineString’} > str(geom.geojson) ‘{“type”: “LineString”, “coordinates”: [[1, 2], [3, 4]]}’

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