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[)                 @   s:   d dl mZ d dlmZmZ d dlmZ G dd dZdS )    )StdDev)NotSupportedErrorProgrammingError)cached_propertyc               @   s  e Zd ZdZdZdZg 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dZdZdZ dZ!dZ"dZ#dZ$dZ%dZ&dZ'dZ(dZ)dZ*dZ+dZ,dZ-dZ.dZ/dZ0dZ1dZ2dZ3dZ4dZ5dZ6dZ7dZ8dZ9dZ:dZ;dZ<dZ=dZ>dZ?dZ@dZAdZBdZCeDZEdZFdZGdZHdZIdZJdZKdZLdZMdZNdZOdZPdZQdZRdZSdZTdZUdZVdZWdZXdZYdZZdZ[e\ Z]dZ^dd Z_e`dd	 Zae`d
d Zbe`dd ZcdS )BaseDatabaseFeaturesFTNZBooleanField c             C   s
   || _ d S )N)
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   D/tmp/pip-install-j7i95hgp/django/django/db/backends/base/features.py__init__  s    zBaseDatabaseFeatures.__init__c             C   s   | j jjdk	S )z5Does this backend support explaining query execution?N)r   opsZexplain_prefix)r	   r
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   r   #supports_explaining_query_execution  s    z8BaseDatabaseFeatures.supports_explaining_query_executionc          	   C   sr   | j j Z}|jd | j jd |jd | j j  | j jd |jd |j \}|jd W dQ R X |dkS )	z!Confirm support for transactions.z"CREATE TABLE ROLLBACK_TEST (X INT)Fz(INSERT INTO ROLLBACK_TEST (X) VALUES (8)Tz"SELECT COUNT(X) FROM ROLLBACK_TESTzDROP TABLE ROLLBACK_TESTNr   )r   cursorexecuteZset_autocommitrollbackZfetchone)r	   r   countr
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   r   supports_transactions  s    
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z*BaseDatabaseFeatures.supports_transactionsc             C   s0   y| j jjtd W n tk
r*   dS X dS )z7Confirm support for STDDEV and related stats functions.   FT)r   r   Zcheck_expression_supportr   r   )r	   r
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   r   supports_stddev  s
    z$BaseDatabaseFeatures.supports_stddev)d__name__
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