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78 lines
2.9 KiB
Plaintext
78 lines
2.9 KiB
Plaintext
==================
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Installing PostGIS
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==================
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`PostGIS`_ adds geographic object support to PostgreSQL, turning it
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into a spatial database. :ref:`geosbuild`, :ref:`proj4` and
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:ref:`gdalbuild` should be installed prior to building PostGIS. You
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might also need additional libraries, see `PostGIS requirements`_.
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The `psycopg`_ or `psycopg2`_ module is required for use as the database
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adapter when using GeoDjango with PostGIS.
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On Debian/Ubuntu, you are advised to install the following packages:
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``postgresql-x``, ``postgresql-x-postgis-3``, ``postgresql-server-dev-x``,
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and ``python3-psycopg3`` (x matching the PostgreSQL version you want to
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install). Alternately, you can `build from source`_. Consult the
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platform-specific instructions if you are on :ref:`macos` or :ref:`windows`.
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.. _PostGIS: https://postgis.net/
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.. _psycopg: https://www.psycopg.org/psycopg3/
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.. _psycopg2: https://www.psycopg.org/
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.. _PostGIS requirements: https://postgis.net/docs/postgis_installation.html#install_requirements
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.. _build from source: https://postgis.net/docs/postgis_installation.html#install_short_version
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Post-installation
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=================
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.. _spatialdb_template:
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Creating a spatial database
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---------------------------
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PostGIS includes an extension for PostgreSQL that's used to enable spatial
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functionality:
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.. code-block:: shell
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$ createdb <db name>
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$ psql <db name>
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> CREATE EXTENSION postgis;
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The database user must be a superuser in order to run
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``CREATE EXTENSION postgis;``. The command is run during the :djadmin:`migrate`
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process. An alternative is to use a migration operation in your project::
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from django.contrib.postgres.operations import CreateExtension
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from django.db import migrations
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class Migration(migrations.Migration):
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operations = [CreateExtension("postgis"), ...]
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If you plan to use PostGIS raster functionality, you should also activate the
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``postgis_raster`` extension. You can install the extension using the
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:class:`~django.contrib.postgres.operations.CreateExtension` migration
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operation, or directly by running ``CREATE EXTENSION postgis_raster;``.
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GeoDjango does not currently leverage any `PostGIS topology functionality`__.
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If you plan to use those features at some point, you can also install the
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``postgis_topology`` extension by issuing ``CREATE EXTENSION
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postgis_topology;``.
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__ https://postgis.net/docs/Topology.html
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Managing the database
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---------------------
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To administer the database, you can either use the pgAdmin III program
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(:menuselection:`Start --> PostgreSQL X --> pgAdmin III`) or the SQL Shell
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(:menuselection:`Start --> PostgreSQL X --> SQL Shell`). For example, to create
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a ``geodjango`` spatial database and user, the following may be executed from
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the SQL Shell as the ``postgres`` user:
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.. code-block:: psql
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postgres# CREATE USER geodjango PASSWORD 'my_passwd';
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postgres# CREATE DATABASE geodjango OWNER geodjango;
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