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Viewing changes to django/contrib/gis/db/backends/spatialite/creation.py

  • Committer: Bazaar Package Importer
  • Author(s): Chris Lamb
  • Date: 2010-05-21 07:52:55 UTC
  • mfrom: (1.3.6 upstream)
  • mto: This revision was merged to the branch mainline in revision 28.
  • Revision ID: james.westby@ubuntu.com-20100521075255-ii78v1dyfmyu3uzx
Tags: upstream-1.2
Import upstream version 1.2

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django/contrib/gis/db/backends/spatialite/creation.py
 
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import os
 
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from django.conf import settings
 
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from django.core.exceptions import ImproperlyConfigured
 
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from django.core.management import call_command
 
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from django.db.backends.sqlite3.creation import DatabaseCreation
 
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class SpatiaLiteCreation(DatabaseCreation):
 
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    def create_test_db(self, verbosity=1, autoclobber=False):
 
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        """
 
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        Creates a test database, prompting the user for confirmation if the
 
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        database already exists. Returns the name of the test database created.
 
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        This method is overloaded to load up the SpatiaLite initialization
 
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        SQL prior to calling the `syncdb` command.
 
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        """
 
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        if verbosity >= 1:
 
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            print "Creating test database '%s'..." % self.connection.alias
 
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        test_database_name = self._create_test_db(verbosity, autoclobber)
 
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        self.connection.close()
 
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        self.connection.settings_dict["NAME"] = test_database_name
 
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        can_rollback = self._rollback_works()
 
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        self.connection.settings_dict["SUPPORTS_TRANSACTIONS"] = can_rollback
 
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        # Need to load the SpatiaLite initialization SQL before running `syncdb`.
 
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        self.load_spatialite_sql()
 
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        call_command('syncdb', verbosity=verbosity, interactive=False, database=self.connection.alias)
 
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        if settings.CACHE_BACKEND.startswith('db://'):
 
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            from django.core.cache import parse_backend_uri
 
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            _, cache_name, _ = parse_backend_uri(settings.CACHE_BACKEND)
 
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            call_command('createcachetable', cache_name)
 
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        # Get a cursor (even though we don't need one yet). This has
 
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        # the side effect of initializing the test database.
 
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        cursor = self.connection.cursor()
 
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        return test_database_name
 
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    def sql_indexes_for_field(self, model, f, style):
 
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        "Return any spatial index creation SQL for the field."
 
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        from django.contrib.gis.db.models.fields import GeometryField
 
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        output = super(SpatiaLiteCreation, self).sql_indexes_for_field(model, f, style)
 
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        if isinstance(f, GeometryField):
 
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            gqn = self.connection.ops.geo_quote_name
 
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            qn = self.connection.ops.quote_name
 
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            db_table = model._meta.db_table
 
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            output.append(style.SQL_KEYWORD('SELECT ') +
 
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                          style.SQL_TABLE('AddGeometryColumn') + '(' +
 
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                          style.SQL_TABLE(gqn(db_table)) + ', ' +
 
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                          style.SQL_FIELD(gqn(f.column)) + ', ' +
 
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                          style.SQL_FIELD(str(f.srid)) + ', ' +
 
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                          style.SQL_COLTYPE(gqn(f.geom_type)) + ', ' +
 
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                          style.SQL_KEYWORD(str(f.dim)) + ', ' +
 
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                          style.SQL_KEYWORD(str(int(not f.null))) +
 
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                          ');')
 
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            if f.spatial_index:
 
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                output.append(style.SQL_KEYWORD('SELECT ') +
 
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                              style.SQL_TABLE('CreateSpatialIndex') + '(' +
 
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                              style.SQL_TABLE(gqn(db_table)) + ', ' +
 
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                              style.SQL_FIELD(gqn(f.column)) + ');')
 
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        return output
 
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    def load_spatialite_sql(self):
 
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        """
 
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        This routine loads up the SpatiaLite SQL file.
 
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        """
 
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        # Getting the location of the SpatiaLite SQL file, and confirming
 
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        # it exists.
 
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        spatialite_sql = self.spatialite_init_file()
 
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        if not os.path.isfile(spatialite_sql):
 
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            raise ImproperlyConfigured('Could not find the required SpatiaLite initialization '
 
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                                       'SQL file (necessary for testing): %s' % spatialite_sql)
 
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        # Opening up the SpatiaLite SQL initialization file and executing
 
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        # as a script.
 
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        sql_fh = open(spatialite_sql, 'r')
 
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        try:
 
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            cur = self.connection._cursor()
 
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            cur.executescript(sql_fh.read())
 
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        finally:
 
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            sql_fh.close()
 
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    def spatialite_init_file(self):
 
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        # SPATIALITE_SQL may be placed in settings to tell GeoDjango
 
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        # to use a specific path to the SpatiaLite initilization SQL.
 
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        return getattr(settings, 'SPATIALITE_SQL',
 
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                       'init_spatialite-%s.%s.sql' %
 
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                       self.connection.ops.spatial_version[:2])