3
gV:                 @   s   d dl Z d dlZd dl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mZmZ d dlmZ d dlmZ d d	lmZ d d
lmZmZmZ d dlmZ G dd deZdS )    N)	lru_cache)chain)settings)
FieldError)DatabaseErrorNotSupportedErrormodels)BaseDatabaseOperations)Col)timezone)
parse_dateparse_datetime
parse_time)cached_propertyc                   s`  e Zd ZdZdddZdZdd Zdd Zd	d
 Zdd Z	dPddZ
dQddZdd Zdd Zdd Zdd Zdd Zdd Zdd Zd d! Zd"d# Zd$d% Zd&d' Zd(d) Zed*d+ Zd,d,d-d.d/Zd0d1 Zd2d3 Zd4d5 Z fd6d7Zd8d9 Zd:d; Z d<d= Z!d>d? Z"d@dA Z#dBdC Z$dDdE Z% fdFdGZ&dHdI Z'dJdK Z(dLdM Z)dR fdNdO	Z*  Z+S )SDatabaseOperationstextZTEXT)	DateFieldDateTimeFieldzEXPLAIN QUERY PLANc             C   s:   t |dkrdS t |dkr.| jjjt | S t |S dS )z
        SQLite has a compile-time default (SQLITE_LIMIT_VARIABLE_NUMBER) of
        999 variables per query.

        If there's only a single field to insert, the limit is 500
        (SQLITE_MAX_COMPOUND_SELECT).
           i  N)len
connectionfeaturesZmax_query_params)selffieldsobjs r   c/var/www/tester-filtro-web/env/lib/python3.6/site-packages/django/db/backends/sqlite3/operations.pybulk_batch_size   s
    z"DatabaseOperations.bulk_batch_sizec             C   s   t jt jt jf}t jt jt jt jf}t||rvxF|j	 D ]:}y
|j
}W n ttfk
r^   Y q8X t||r8tdq8W t|t jr|jrt|jdkrtdd S )Nz{You cannot use Sum, Avg, StdDev, and Variance aggregations on date/time fields in sqlite3 since date/time is saved as text.r   zTSQLite doesn't support DISTINCT on aggregate functions accepting multiple arguments.)r   r   r   	TimeFieldZSumZAvgZVarianceZStdDev
isinstanceZget_source_expressionsoutput_fieldAttributeErrorr   r   Z	AggregateZdistinctr   Zsource_expressions)r   
expressionZ
bad_fieldsZbad_aggregatesexprr    r   r   r   check_expression_support(   s     



z+DatabaseOperations.check_expression_supportc             C   s   d|j  |f S )z
        Support EXTRACT with a user-defined function django_date_extract()
        that's registered in connect(). Use single quotes because this is a
        string and could otherwise cause a collision with a field name.
        zdjango_date_extract('%s', %s))lower)r   lookup_type
field_namer   r   r   date_extract_sqlD   s    z#DatabaseOperations.date_extract_sqlc             C   s   |S )z>Do nothing since formatting is handled in the custom function.r   )r   sqlr   r   r   format_for_duration_arithmeticL   s    z1DatabaseOperations.format_for_duration_arithmeticNc             C   s   d|j  |f| j| S )Nz#django_date_trunc('%s', %s, %s, %s))r%   _convert_tznames_to_sql)r   r&   r'   tznamer   r   r   date_trunc_sqlP   s    z!DatabaseOperations.date_trunc_sqlc             C   s   d|j  |f| j| S )Nz#django_time_trunc('%s', %s, %s, %s))r%   r+   )r   r&   r'   r,   r   r   r   time_trunc_sqlW   s    z!DatabaseOperations.time_trunc_sqlc             C   s"   |rt jrd| d| jj fS dS )Nz'%s'NULL)r/   r/   )r   USE_TZr   Ztimezone_name)r   r,   r   r   r   r+   ^   s    
z*DatabaseOperations._convert_tznames_to_sqlc             C   s   d|f| j | S )Nz%django_datetime_cast_date(%s, %s, %s))r+   )r   r'   r,   r   r   r   datetime_cast_date_sqlc   s    z)DatabaseOperations.datetime_cast_date_sqlc             C   s   d|f| j | S )Nz%django_datetime_cast_time(%s, %s, %s))r+   )r   r'   r,   r   r   r   datetime_cast_time_sqlh   s    z)DatabaseOperations.datetime_cast_time_sqlc             C   s   d|j  |f| j| S )Nz)django_datetime_extract('%s', %s, %s, %s))r%   r+   )r   r&   r'   r,   r   r   r   datetime_extract_sqlm   s    z'DatabaseOperations.datetime_extract_sqlc             C   s   d|j  |f| j| S )Nz'django_datetime_trunc('%s', %s, %s, %s))r%   r+   )r   r&   r'   r,   r   r   r   datetime_trunc_sqlr   s    z%DatabaseOperations.datetime_trunc_sqlc             C   s   d|j  |f S )Nzdjango_time_extract('%s', %s))r%   )r   r&   r'   r   r   r   time_extract_sqlw   s    z#DatabaseOperations.time_extract_sqlc             C   s   dS )Nr/   r   )r   r   r   r   pk_default_valuez   s    z#DatabaseOperations.pk_default_valuec          
   C   s   d}t ||krPf }x6tdt ||D ]"}||||  }|| j|7 }q&W |S ddjdgt |  }| jjj }z|j||j S |j  X dS )zV
        Only for last_executed_query! Don't use this to execute SQL queries!
        i  r   zSELECT z, zQUOTE(?)N)	r   range%_quote_params_for_last_executed_queryjoinr   cursorexecuteZfetchoneclose)r   paramsZ
BATCH_SIZEresultsindexchunkr)   r:   r   r   r   r8   }   s    	z8DatabaseOperations._quote_params_for_last_executed_queryc             C   sR   |rJt |ttfr| j|}n$t|j }| j|}tt||}|| S |S d S )N)r   listtupler8   valuesdictzip)r   r:   r)   r=   rC   r   r   r   last_executed_query   s    
z&DatabaseOperations.last_executed_queryc             C   s    |j dr|jdr|S d| S )N"z"%s")
startswithendswith)r   namer   r   r   
quote_name   s    zDatabaseOperations.quote_namec             C   s   dS )Nr   r   )r   r   r   r   no_limit_value   s    z!DatabaseOperations.no_limit_valuec          
   C   sB   d}|ddf}| j j  }|j||}dd |j D S Q R X d S )Nz
        WITH tables AS (
            SELECT %s name
            UNION
            SELECT sqlite_master.name
            FROM sqlite_master
            JOIN tables ON (sql REGEXP %s || tables.name || %s)
        ) SELECT name FROM tables;
        z(?i)\s+references\s+("|\')?z("|\')?\s*\(c             S   s   g | ]}|d  qS )r   r   ).0rowr   r   r   
<listcomp>   s    z9DatabaseOperations.__references_graph.<locals>.<listcomp>)r   r:   r;   Zfetchall)r   Z
table_namequeryr=   r:   r>   r   r   r   Z__references_graph   s    	z%DatabaseOperations.__references_graphc             C   s   t dd| jS )Ni   )maxsize)r   %_DatabaseOperations__references_graph)r   r   r   r   _references_graph   s    z$DatabaseOperations._references_graphF)reset_sequencesallow_cascadec               s`   |r$|r$t tj fdd|D } fdd|D }|r\dd |D }|j j| |S )Nc             3   s   | ]} j |V  qd S )N)rT   )rN   table)r   r   r   	<genexpr>   s    z/DatabaseOperations.sql_flush.<locals>.<genexpr>c                s2   g | ]*}d j dj dj j|f qS )z	%s %s %s;DELETEZFROM)SQL_KEYWORD	SQL_FIELDrK   )rN   rW   )r   styler   r   rP      s   z0DatabaseOperations.sql_flush.<locals>.<listcomp>c             S   s   g | ]}d |iqS )rW   r   )rN   rW   r   r   r   rP      s    )setr   from_iterableextendsequence_reset_by_name_sql)r   r\   ZtablesrU   rV   r)   	sequencesr   )r   r\   r   	sql_flush   s    zDatabaseOperations.sql_flushc             C   sn   |sg S d|j d|j| jd|j d|j| jd|j d|j| jd|j dd	jd
d |D f gS )Nz%s %s %s %s = 0 %s %s %s (%s);ZUPDATEZsqlite_sequenceZSETseqZWHERErJ   INz, c             S   s   g | ]}d |d  qS )z'%s'rW   r   )rN   Zsequence_infor   r   r   rP      s    zADatabaseOperations.sequence_reset_by_name_sql.<locals>.<listcomp>)rZ   Z	SQL_TABLErK   r[   r9   )r   r\   ra   r   r   r   r`      s    z-DatabaseOperations.sequence_reset_by_name_sqlc             C   sL   |d krd S t |dr|S tj|rDtjr<tj|| jj}ntdt|S )Nresolve_expressionzNSQLite backend does not support timezone-aware datetimes when USE_TZ is False.)	hasattrr   is_awarer   r0   Z
make_naiver   
ValueErrorstr)r   valuer   r   r   adapt_datetimefield_value   s    

z,DatabaseOperations.adapt_datetimefield_valuec             C   s4   |d krd S t |dr|S tj|r,tdt|S )Nre   z5SQLite backend does not support timezone-aware times.)rf   r   rg   rh   ri   )r   rj   r   r   r   adapt_timefield_value   s    

z(DatabaseOperations.adapt_timefield_valuec                s   t  j|}|jj }|dkr,|j| j np|dkrB|j| j nZ|dkrX|j| j nD|dkrr|j| j| n*|dkr|j| j	 n|dkr|j| j
 |S )	Nr   r   r   ZDecimalFieldZ	UUIDFieldNullBooleanFieldBooleanField)rm   rn   )superget_db_convertersr    Zget_internal_typeappendconvert_datetimefield_valueconvert_datefield_valueconvert_timefield_valueget_decimalfield_converterconvert_uuidfield_valueconvert_booleanfield_value)r   r"   
convertersinternal_type)	__class__r   r   rp     s    
z$DatabaseOperations.get_db_convertersc             C   sB   |d k	r>t |tjst|}tjr>tj| r>tj|| jj}|S )N)	r   datetimer   r   r0   r   rg   Z
make_awarer   )r   rj   r"   r   r   r   r   rr     s    z.DatabaseOperations.convert_datetimefield_valuec             C   s    |d k	rt |tjst|}|S )N)r   r{   dater   )r   rj   r"   r   r   r   r   rs   $  s    z*DatabaseOperations.convert_datefield_valuec             C   s    |d k	rt |tjst|}|S )N)r   r{   timer   )r   rj   r"   r   r   r   r   rt   *  s    z*DatabaseOperations.convert_timefield_valuec                sN   t jddj t|tr>t jdj|jj  fdd}n fdd}|S )N   )precr   c                s"   | d k	r | j |jjdS d S )N)context)quantizer    r   )rj   r"   r   )create_decimalquantize_valuer   r   	converter7  s    z@DatabaseOperations.get_decimalfield_converter.<locals>.converterc                s   | d k	r | S d S )Nr   )rj   r"   r   )r   r   r   r   ;  s    )	decimalContextcreate_decimal_from_floatr   r
   Decimalscalebr    Zdecimal_places)r   r"   r   r   )r   r   r   ru   0  s    
z-DatabaseOperations.get_decimalfield_converterc             C   s   |d k	rt j|}|S )N)uuidUUID)r   rj   r"   r   r   r   r   rv   @  s    
z*DatabaseOperations.convert_uuidfield_valuec             C   s   |dkrt |S |S )Nr   r   )r   r   )bool)r   rj   r"   r   r   r   r   rw   E  s    z-DatabaseOperations.convert_booleanfield_valuec             C   s   dj dd |D S )Nz UNION ALL c             s   s   | ]}d dj | V  qdS )z	SELECT %sz, N)r9   )rN   rO   r   r   r   rX   J  s   z5DatabaseOperations.bulk_insert_sql.<locals>.<genexpr>)r9   )r   r   Zplaceholder_rowsr   r   r   bulk_insert_sqlH  s    z"DatabaseOperations.bulk_insert_sqlc                s:   |dkrddj | S |dkr,ddj | S t j||S )N^z	POWER(%s),#z
BITXOR(%s))r9   ro   combine_expression)r   	connectorsub_expressions)rz   r   r   r   N  s
    z%DatabaseOperations.combine_expressionc             C   sD   |d	krt d| d| g| }t|dkr6tdddj| S )
N+-z$Invalid connector for timedelta: %s.z'%s'   z)Too many params for timedelta operations.zdjango_format_dtdelta(%s)z, )r   r   )r   r   rh   r9   )r   r   r   Z	fn_paramsr   r   r   combine_duration_expressionW  s    z.DatabaseOperations.combine_duration_expressionc             C   s   dS )N)NNr   )r   ry   r   r   r   integer_field_range_  s    z&DatabaseOperations.integer_field_rangec       	      C   s@   |\}}|\}}||}|dkr0d||f |fS d||f |fS )Nr   zdjango_time_diff(%s, %s)zdjango_timestamp_diff(%s, %s)r   )	r   ry   lhsrhsZlhs_sqlZ
lhs_paramsZrhs_sqlZ
rhs_paramsr=   r   r   r   subtract_temporalsc  s    z%DatabaseOperations.subtract_temporalsc                s   |rdS t  j|S )NzINSERT OR IGNORE INTO)ro   insert_statement)r   Zignore_conflicts)rz   r   r   r   k  s    z#DatabaseOperations.insert_statement)N)N)F),__name__
__module____qualname__Z"cast_char_field_without_max_lengthZcast_data_typesZexplain_prefixr   r$   r(   r*   r-   r.   r+   r1   r2   r3   r4   r5   r6   r8   rF   rK   rM   rS   r   rT   rb   r`   rk   rl   rp   rr   rs   rt   ru   rv   rw   r   r   r   r   r   r   __classcell__r   r   )rz   r   r      sP   

	r   )r{   r   r   	functoolsr   	itertoolsr   Zdjango.confr   Zdjango.core.exceptionsr   Z	django.dbr   r   r   Z"django.db.backends.base.operationsr	   Zdjango.db.models.expressionsr
   Zdjango.utilsr   Zdjango.utils.dateparser   r   r   Zdjango.utils.functionalr   r   r   r   r   r   <module>   s   