sqlall.py 文件源码

def sql_create(app_config, style, connection):
    "Returns a list of the CREATE TABLE SQL statements for the given app."

    if connection.settings_dict['ENGINE'] == 'django.db.backends.dummy':
        # This must be the "dummy" database backend, which means the user
        # hasn't set ENGINE for the database.
        raise CommandError(
            "Django doesn't know which syntax to use for your SQL statements,"
            "\nbecause you haven't properly specified the ENGINE setting for "
            "the database.\n"
            "see: https://docs.djangoproject.com/en/%s/ref/settings/"
            "#databases" % get_docs_version()
        )

    # Get installed models, so we generate REFERENCES right.
    # We trim models from the current app so that the sqlreset command does not
    # generate invalid SQL (leaving models out of known_models is harmless, so
    # we can be conservative).
    final_output = []
    output = []

    for model in router.get_migratable_models(
            app_config, connection.alias, include_auto_created=True):
        with connection.schema_editor() as editor:
            output += sql_create_model(editor, model)
            final_output.extend(editor.deferred_sql)
            editor.deferred_sql = []

    return output + final_output