
 X
                 @   s   d  d l  m Z d  d l m Z d  d l m Z d  d l m Z d  d l m	 Z	 d d l
 m Z y d  d l Z Wn e k
 r d Z Yn XGd	 d
   d
 e  Z d S)    )unicode_literals)utils)BaseDatabaseFeatures)six)cached_property   )DatabaseNc               @   s   e  Z d  Z d Z d Z d Z d Z d Z d Z d Z	 d Z
 d Z d Z d Z d Z d Z d Z d Z d Z d Z d Z d Z d Z d Z d Z e d d    Z e d d    Z e d d    Z e d	 d
    Z e d d    Z d S)DatabaseFeaturesFTc             C   s   t  j d k S)N         )r
   r   r   )r   sqlite_version_info)self r   Q/home/ubuntu/projects/ifolica/build/django/django/db/backends/sqlite3/features.pyuses_savepoints,   s    z DatabaseFeatures.uses_savepointsc             C   s   |  j  S)N)r   )r   r   r   r   can_release_savepoints0   s    z'DatabaseFeatures.can_release_savepointsc             C   s%   t  j o$ t j d k o$ t j d k S)Nzsqlite3.dbapi2r
         )r
   r   r   )r   PY3r   __name__r   )r   r   r   r   can_share_in_memory_db4   s    	z'DatabaseFeatures.can_share_in_memory_dbc             C   sk   |  j  j   V } | j d  y | j d  d } Wn t j k
 rS d } Yn X| j d  Wd QX| S)a  Confirm support for STDDEV and related stats functions

        SQLite supports STDDEV as an extension package; so
        connection.ops.check_expression_support() can't unilaterally
        rule out support for STDDEV. We need to manually check
        whether the call works.
        z CREATE TABLE STDDEV_TEST (X INT)z!SELECT STDDEV(*) FROM STDDEV_TESTTFzDROP TABLE STDDEV_TESTN)
connectioncursorexecuter   ZDatabaseError)r   r   Zhas_supportr   r   r   supports_stddev<   s    	
z DatabaseFeatures.supports_stddevc             C   s
   t  d  k	 S)N)pytz)r   r   r   r   has_zoneinfo_databaseO   s    z&DatabaseFeatures.has_zoneinfo_databaseN)r   
__module____qualname__Zcan_use_chunked_readsZ#test_db_allows_multiple_connectionsZsupports_unspecified_pkZsupports_timezonesZsupports_1000_query_parametersZ(supports_mixed_date_datetime_comparisonsZhas_bulk_insertZ6can_combine_inserts_with_and_without_auto_increment_pkZsupports_foreign_keysZ!supports_column_check_constraintsZ"autocommits_when_autocommit_is_offZcan_introspect_decimal_fieldZ%can_introspect_positive_integer_fieldZ"can_introspect_small_integer_fieldZsupports_transactionsZatomic_transactionsZcan_rollback_ddlZsupports_paramstyle_pyformatZsupports_sequence_resetZcan_clone_databasesZsupports_temporal_subtractionZignores_quoted_identifier_caser   r   r   r   r   r   r   r   r   r   r	      s6   r	   )
__future__r   Z	django.dbr   Z django.db.backends.base.featuresr   Zdjango.utilsr   Zdjango.utils.functionalr   baser   r   ImportErrorr	   r   r   r   r   <module>   s   