1 import os

     2 from django.conf import settings

     3 from django.core.exceptions import ImproperlyConfigured

     4 from django.core.management import call_command

     5 from django.db.backends.sqlite3.creation import DatabaseCreation

     6 

     7 class SpatiaLiteCreation(DatabaseCreation):

     8 

     9     def create_test_db(self, verbosity=1, autoclobber=False):

    10         """

    11         Creates a test database, prompting the user for confirmation if the

    12         database already exists. Returns the name of the test database created.

    13 

    14         This method is overloaded to load up the SpatiaLite initialization

    15         SQL prior to calling the `syncdb` command.

    16         """

    17         if verbosity >= 1:

    18             print "Creating test database '%s'..." % self.connection.alias

    19 

    20         test_database_name = self._create_test_db(verbosity, autoclobber)

    21 

    22         self.connection.close()

    23 

    24         self.connection.settings_dict["NAME"] = test_database_name

    25         can_rollback = self._rollback_works()

    26         self.connection.settings_dict["SUPPORTS_TRANSACTIONS"] = can_rollback

    27         # Need to load the SpatiaLite initialization SQL before running `syncdb`.

    28         self.load_spatialite_sql()

    29         call_command('syncdb', verbosity=verbosity, interactive=False, database=self.connection.alias)

    30 

    31         if settings.CACHE_BACKEND.startswith('db://'):

    32             from django.core.cache import parse_backend_uri

    33             _, cache_name, _ = parse_backend_uri(settings.CACHE_BACKEND)

    34             call_command('createcachetable', cache_name)

    35 

    36         # Get a cursor (even though we don't need one yet). This has

    37         # the side effect of initializing the test database.

    38         cursor = self.connection.cursor()

    39 

    40         return test_database_name

    41 

    42     def sql_indexes_for_field(self, model, f, style):

    43         "Return any spatial index creation SQL for the field."

    44         from django.contrib.gis.db.models.fields import GeometryField

    45 

    46         output = super(SpatiaLiteCreation, self).sql_indexes_for_field(model, f, style)

    47 

    48         if isinstance(f, GeometryField):

    49             gqn = self.connection.ops.geo_quote_name

    50             qn = self.connection.ops.quote_name

    51             db_table = model._meta.db_table

    52 

    53             output.append(style.SQL_KEYWORD('SELECT ') +

    54                           style.SQL_TABLE('AddGeometryColumn') + '(' +

    55                           style.SQL_TABLE(gqn(db_table)) + ', ' +

    56                           style.SQL_FIELD(gqn(f.column)) + ', ' +

    57                           style.SQL_FIELD(str(f.srid)) + ', ' +

    58                           style.SQL_COLTYPE(gqn(f.geom_type)) + ', ' +

    59                           style.SQL_KEYWORD(str(f.dim)) + ', ' +

    60                           style.SQL_KEYWORD(str(int(not f.null))) +

    61                           ');')

    62 

    63             if f.spatial_index:

    64                 output.append(style.SQL_KEYWORD('SELECT ') +

    65                               style.SQL_TABLE('CreateSpatialIndex') + '(' +

    66                               style.SQL_TABLE(gqn(db_table)) + ', ' +

    67                               style.SQL_FIELD(gqn(f.column)) + ');')

    68 

    69         return output

    70 

    71     def load_spatialite_sql(self):

    72         """

    73         This routine loads up the SpatiaLite SQL file.

    74         """

    75         # Getting the location of the SpatiaLite SQL file, and confirming

    76         # it exists.

    77         spatialite_sql = self.spatialite_init_file()

    78         if not os.path.isfile(spatialite_sql):

    79             raise ImproperlyConfigured('Could not find the required SpatiaLite initialization '

    80                                        'SQL file (necessary for testing): %s' % spatialite_sql)

    81 

    82         # Opening up the SpatiaLite SQL initialization file and executing

    83         # as a script.

    84         sql_fh = open(spatialite_sql, 'r')

    85         try:

    86             cur = self.connection._cursor()

    87             cur.executescript(sql_fh.read())

    88         finally:

    89             sql_fh.close()

    90 

    91     def spatialite_init_file(self):

    92         # SPATIALITE_SQL may be placed in settings to tell GeoDjango

    93         # to use a specific path to the SpatiaLite initilization SQL.

    94         return getattr(settings, 'SPATIALITE_SQL',

    95                        'init_spatialite-%s.%s.sql' %

    96                        self.connection.ops.spatial_version[:2])