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   || _ d S )N)Ú
connection)Úselfr   © r	   úD/tmp/pip-unpacked-wheel-dv63caxw/django/db/backends/base/features.pyÚ__init__A  s    zBaseDatabaseFeatures.__init__c                 C   s   | j jjdk	S )z5Does this backend support explaining query execution?N)r   ÚopsZexplain_prefix)r   r	   r	   r
   Ú#supports_explaining_query_executionD  s    z8BaseDatabaseFeatures.supports_explaining_query_executionc              	   C   sr   | j  ¡ �Z}| d¡ | j  d¡ | d¡ | j  ¡  | j  d¡ | d¡ | ¡ \}| d¡ W 5 Q R X |dkS )z!Confirm support for transactions.z"CREATE TABLE ROLLBACK_TEST (X INT)Fz(INSERT INTO ROLLBACK_TEST (X) VALUES (8)Tz"SELECT COUNT(X) FROM ROLLBACK_TESTzDROP TABLE ROLLBACK_TESTr   )r   ÚcursorÚexecuteZset_autocommitÚrollbackZfetchone)r   r   Úcountr	   r	   r
   Úsupports_transactionsI  s    
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z*BaseDatabaseFeatures.supports_transactionsc                 C   s   | j s
dS |jjS )NF)Úallows_group_by_selected_pksZ_metaZmanaged)r   Úmodelr	   r	   r
   Ú%allows_group_by_selected_pks_on_modelW  s    z:BaseDatabaseFeatures.allows_group_by_selected_pks_on_model)}Ú__name__Ú
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   r      sò   

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